lustre/target/tgt_handler.c

   1 /*
   2  * GPL HEADER START
   3  *
   4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 only,
   8  * as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * General Public License version 2 for more details (a copy is included
  14  * in the LICENSE file that accompanied this code).
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * version 2 along with this program; if not, write to the
  18  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  19  * Boston, MA 021110-1307, USA
  20  *
  21  * GPL HEADER END
  22  */
  23 /*
  24  * Copyright (c) 2013, 2017, Intel Corporation.
  25  */
  26 /*
  27  * lustre/target/tgt_handler.c
  28  *
  29  * Lustre Unified Target request handler code
  30  *
  31  * Author: Brian Behlendorf <behlendorf1@llnl.gov>
  32  * Author: Mikhail Pershin <mike.pershin@intel.com>
  33  */
  34
  35 #define DEBUG_SUBSYSTEM S_CLASS
  36
  37 #include <linux/user_namespace.h>
  38 #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 HAS_BODY flag is set for this request type check whether object
  67  *  actually exists on storage (lu_object_exists()).
  68  *
  69  */
  70 static int tgt_mdt_body_unpack(struct tgt_session_info *tsi, __u32 flags)
  71 {
  72         const struct mdt_body   *body;
  73         struct lu_object        *obj;
  74         struct req_capsule      *pill = tsi->tsi_pill;
  75         int                      rc;
  76
  77         ENTRY;
  78
  79         body = req_capsule_client_get(pill, &RMF_MDT_BODY);
  80         if (body == NULL)
  81                 RETURN(-EFAULT);
  82
  83         tsi->tsi_mdt_body = body;
  84
  85         if (!(body->mbo_valid & OBD_MD_FLID))
  86                 RETURN(0);
  87
  88         /* mdc_pack_body() doesn't check if fid is zero and set OBD_ML_FID
  89          * in any case in pre-2.5 clients. Fix that here if needed */
  90         if (unlikely(fid_is_zero(&body->mbo_fid1)))
  91                 RETURN(0);
  92
  93         if (!fid_is_sane(&body->mbo_fid1)) {
  94                 CERROR("%s: invalid FID: "DFID"\n", tgt_name(tsi->tsi_tgt),
  95                        PFID(&body->mbo_fid1));
  96                 RETURN(-EINVAL);
  97         }
  98
  99         obj = lu_object_find(tsi->tsi_env,
 100                              &tsi->tsi_tgt->lut_bottom->dd_lu_dev,
 101                              &body->mbo_fid1, NULL);
 102         if (!IS_ERR(obj)) {
 103                 if ((flags & HAS_BODY) && !lu_object_exists(obj)) {
 104                         lu_object_put(tsi->tsi_env, obj);
 105                         rc = -ENOENT;
 106                 } else {
 107                         tsi->tsi_corpus = obj;
 108                         rc = 0;
 109                 }
 110         } else {
 111                 rc = PTR_ERR(obj);
 112         }
 113
 114         tsi->tsi_fid = body->mbo_fid1;
 115
 116         RETURN(rc);
 117 }
 118
 119 /**
 120  * Validate oa from client.
 121  * If the request comes from 2.0 clients, currently only RSVD seq and IDIF
 122  * req are valid.
 123  *    a. objects in Single MDT FS  seq = FID_SEQ_OST_MDT0, oi_id != 0
 124  *    b. Echo objects(seq = 2), old echo client still use oi_id/oi_seq to
 125  *       pack ost_id. Because non-zero oi_seq will make it diffcult to tell
 126  *       whether this is oi_fid or real ostid. So it will check
 127  *       OBD_CONNECT_FID, then convert the ostid to FID for old client.
 128  *    c. Old FID-disable osc will send IDIF.
 129  *    d. new FID-enable osc/osp will send normal FID.
 130  *
 131  * And also oi_id/f_oid should always start from 1. oi_id/f_oid = 0 will
 132  * be used for LAST_ID file, and only being accessed inside OST now.
 133  */
 134 int tgt_validate_obdo(struct tgt_session_info *tsi, struct obdo *oa)
 135 {
 136         struct ost_id   *oi     = &oa->o_oi;
 137         u64              seq    = ostid_seq(oi);
 138         u64              id     = ostid_id(oi);
 139         int              rc;
 140         ENTRY;
 141
 142         if (unlikely(!(exp_connect_flags(tsi->tsi_exp) & OBD_CONNECT_FID) &&
 143                      fid_seq_is_echo(seq))) {
 144                 /* Sigh 2.[123] client still sends echo req with oi_id = 0
 145                  * during create, and we will reset this to 1, since this
 146                  * oi_id is basically useless in the following create process,
 147                  * but oi_id == 0 will make it difficult to tell whether it is
 148                  * real FID or ost_id. */
 149                 oi->oi_fid.f_seq = FID_SEQ_ECHO;
 150                 oi->oi_fid.f_oid = id ?: 1;
 151                 oi->oi_fid.f_ver = 0;
 152         } else {
 153                 struct tgt_thread_info *tti = tgt_th_info(tsi->tsi_env);
 154
 155                 if (unlikely((oa->o_valid & OBD_MD_FLID) && id == 0))
 156                         GOTO(out, rc = -EPROTO);
 157
 158                 /* Note: this check might be forced in 2.5 or 2.6, i.e.
 159                  * all of the requests are required to setup FLGROUP */
 160                 if (unlikely(!(oa->o_valid & OBD_MD_FLGROUP))) {
 161                         ostid_set_seq_mdt0(oi);
 162                         oa->o_valid |= OBD_MD_FLGROUP;
 163                         seq = ostid_seq(oi);
 164                 }
 165
 166                 if (unlikely(!(fid_seq_is_idif(seq) || fid_seq_is_mdt0(seq) ||
 167                                fid_seq_is_norm(seq) || fid_seq_is_echo(seq))))
 168                         GOTO(out, rc = -EPROTO);
 169
 170                 rc = ostid_to_fid(&tti->tti_fid1, oi,
 171                                   tsi->tsi_tgt->lut_lsd.lsd_osd_index);
 172                 if (unlikely(rc != 0))
 173                         GOTO(out, rc);
 174
 175                 oi->oi_fid = tti->tti_fid1;
 176         }
 177
 178         RETURN(0);
 179
 180 out:
 181         CERROR("%s: client %s sent bad object "DOSTID": rc = %d\n",
 182                tgt_name(tsi->tsi_tgt), obd_export_nid2str(tsi->tsi_exp),
 183                seq, id, rc);
 184         return rc;
 185 }
 186 EXPORT_SYMBOL(tgt_validate_obdo);
 187
 188 static int tgt_io_data_unpack(struct tgt_session_info *tsi, struct ost_id *oi)
 189 {
 190         unsigned                 max_brw;
 191         struct niobuf_remote    *rnb;
 192         struct obd_ioobj        *ioo;
 193         int                      obj_count;
 194
 195         ENTRY;
 196
 197         ioo = req_capsule_client_get(tsi->tsi_pill, &RMF_OBD_IOOBJ);
 198         if (ioo == NULL)
 199                 RETURN(-EPROTO);
 200
 201         rnb = req_capsule_client_get(tsi->tsi_pill, &RMF_NIOBUF_REMOTE);
 202         if (rnb == NULL)
 203                 RETURN(-EPROTO);
 204
 205         max_brw = ioobj_max_brw_get(ioo);
 206         if (unlikely((max_brw & (max_brw - 1)) != 0)) {
 207                 CERROR("%s: client %s sent bad ioobj max %u for "DOSTID
 208                        ": rc = %d\n", tgt_name(tsi->tsi_tgt),
 209                        obd_export_nid2str(tsi->tsi_exp), max_brw,
 210                        POSTID(oi), -EPROTO);
 211                 RETURN(-EPROTO);
 212         }
 213         ioo->ioo_oid = *oi;
 214
 215         obj_count = req_capsule_get_size(tsi->tsi_pill, &RMF_OBD_IOOBJ,
 216                                         RCL_CLIENT) / sizeof(*ioo);
 217         if (obj_count == 0) {
 218                 CERROR("%s: short ioobj\n", tgt_name(tsi->tsi_tgt));
 219                 RETURN(-EPROTO);
 220         } else if (obj_count > 1) {
 221                 CERROR("%s: too many ioobjs (%d)\n", tgt_name(tsi->tsi_tgt),
 222                        obj_count);
 223                 RETURN(-EPROTO);
 224         }
 225
 226         if (ioo->ioo_bufcnt == 0) {
 227                 CERROR("%s: ioo has zero bufcnt\n", tgt_name(tsi->tsi_tgt));
 228                 RETURN(-EPROTO);
 229         }
 230
 231         if (ioo->ioo_bufcnt > PTLRPC_MAX_BRW_PAGES) {
 232                 DEBUG_REQ(D_RPCTRACE, tgt_ses_req(tsi),
 233                           "bulk has too many pages (%d)",
 234                           ioo->ioo_bufcnt);
 235                 RETURN(-EPROTO);
 236         }
 237
 238         RETURN(0);
 239 }
 240
 241 static int tgt_ost_body_unpack(struct tgt_session_info *tsi, __u32 flags)
 242 {
 243         struct ost_body         *body;
 244         struct req_capsule      *pill = tsi->tsi_pill;
 245         struct lu_nodemap       *nodemap;
 246         int                      rc;
 247
 248         ENTRY;
 249
 250         body = req_capsule_client_get(pill, &RMF_OST_BODY);
 251         if (body == NULL)
 252                 RETURN(-EFAULT);
 253
 254         rc = tgt_validate_obdo(tsi, &body->oa);
 255         if (rc)
 256                 RETURN(rc);
 257
 258         nodemap = nodemap_get_from_exp(tsi->tsi_exp);
 259         if (IS_ERR(nodemap))
 260                 RETURN(PTR_ERR(nodemap));
 261
 262         body->oa.o_uid = nodemap_map_id(nodemap, NODEMAP_UID,
 263                                         NODEMAP_CLIENT_TO_FS,
 264                                         body->oa.o_uid);
 265         body->oa.o_gid = nodemap_map_id(nodemap, NODEMAP_GID,
 266                                         NODEMAP_CLIENT_TO_FS,
 267                                         body->oa.o_gid);
 268         nodemap_putref(nodemap);
 269
 270         tsi->tsi_ost_body = body;
 271         tsi->tsi_fid = body->oa.o_oi.oi_fid;
 272
 273         if (req_capsule_has_field(pill, &RMF_OBD_IOOBJ, RCL_CLIENT)) {
 274                 rc = tgt_io_data_unpack(tsi, &body->oa.o_oi);
 275                 if (rc < 0)
 276                         RETURN(rc);
 277         }
 278
 279         if (!(body->oa.o_valid & OBD_MD_FLID)) {
 280                 if (flags & HAS_BODY) {
 281                         CERROR("%s: OBD_MD_FLID flag is not set in ost_body but OID/FID is mandatory with HAS_BODY\n",
 282                                tgt_name(tsi->tsi_tgt));
 283                         RETURN(-EPROTO);
 284                 } else {
 285                         RETURN(0);
 286                 }
 287         }
 288
 289         ost_fid_build_resid(&tsi->tsi_fid, &tsi->tsi_resid);
 290
 291         /*
 292          * OST doesn't get object in advance for further use to prevent
 293          * situations with nested object_find which is potential deadlock.
 294          */
 295         tsi->tsi_corpus = NULL;
 296         RETURN(rc);
 297 }
 298
 299 /*
 300  * Do necessary preprocessing according to handler ->th_flags.
 301  */
 302 static int tgt_request_preprocess(struct tgt_session_info *tsi,
 303                                   struct tgt_handler *h,
 304                                   struct ptlrpc_request *req)
 305 {
 306         struct req_capsule      *pill = tsi->tsi_pill;
 307         __u32                    flags = h->th_flags;
 308         int                      rc = 0;
 309
 310         ENTRY;
 311
 312         if (tsi->tsi_preprocessed)
 313                 RETURN(0);
 314
 315         LASSERT(h->th_act != NULL);
 316         LASSERT(h->th_opc == lustre_msg_get_opc(req->rq_reqmsg));
 317         LASSERT(current->journal_info == NULL);
 318
 319         LASSERT(ergo(flags & (HAS_BODY | HAS_REPLY),
 320                      h->th_fmt != NULL));
 321         if (h->th_fmt != NULL) {
 322                 req_capsule_set(pill, h->th_fmt);
 323                 if (req_capsule_has_field(pill, &RMF_MDT_BODY, RCL_CLIENT)) {
 324                         rc = tgt_mdt_body_unpack(tsi, flags);
 325                         if (rc < 0)
 326                                 RETURN(rc);
 327                 } else if (req_capsule_has_field(pill, &RMF_OST_BODY,
 328                                                  RCL_CLIENT)) {
 329                         rc = tgt_ost_body_unpack(tsi, flags);
 330                         if (rc < 0)
 331                                 RETURN(rc);
 332                 }
 333         }
 334
 335         if (flags & IS_MUTABLE && tgt_conn_flags(tsi) & OBD_CONNECT_RDONLY)
 336                 RETURN(-EROFS);
 337
 338         if (flags & HAS_KEY) {
 339                 struct ldlm_request *dlm_req;
 340
 341                 LASSERT(h->th_fmt != NULL);
 342
 343                 dlm_req = req_capsule_client_get(pill, &RMF_DLM_REQ);
 344                 if (dlm_req != NULL) {
 345                         union ldlm_wire_policy_data *policy =
 346                                         &dlm_req->lock_desc.l_policy_data;
 347
 348                         if (unlikely(dlm_req->lock_desc.l_resource.lr_type ==
 349                                      LDLM_IBITS &&
 350                                      (policy->l_inodebits.bits |
 351                                       policy->l_inodebits.try_bits) == 0)) {
 352                                 /*
 353                                  * Lock without inodebits makes no sense and
 354                                  * will oops later in ldlm. If client miss to
 355                                  * set such bits, do not trigger ASSERTION.
 356                                  *
 357                                  * For liblustre flock case, it maybe zero.
 358                                  */
 359                                 rc = -EPROTO;
 360                         } else {
 361                                 tsi->tsi_dlm_req = dlm_req;
 362                         }
 363                 } else {
 364                         rc = -EFAULT;
 365                 }
 366         }
 367         tsi->tsi_preprocessed = 1;
 368         RETURN(rc);
 369 }
 370
 371 /*
 372  * Invoke handler for this request opc. Also do necessary preprocessing
 373  * (according to handler ->th_flags), and post-processing (setting of
 374  * ->last_{xid,committed}).
 375  */
 376 static int tgt_handle_request0(struct tgt_session_info *tsi,
 377                                struct tgt_handler *h,
 378                                struct ptlrpc_request *req)
 379 {
 380         int      serious = 0;
 381         int      rc;
 382         __u32    opc = lustre_msg_get_opc(req->rq_reqmsg);
 383
 384         ENTRY;
 385
 386
 387         /* When dealing with sec context requests, no export is associated yet,
 388          * because these requests are sent before *_CONNECT requests.
 389          * A NULL req->rq_export means the normal *_common_slice handlers will
 390          * not be called, because there is no reference to the target.
 391          * So deal with them by hand and jump directly to target_send_reply().
 392          */
 393         switch (opc) {
 394         case SEC_CTX_INIT:
 395         case SEC_CTX_INIT_CONT:
 396         case SEC_CTX_FINI:
 397                 CFS_FAIL_TIMEOUT(OBD_FAIL_SEC_CTX_HDL_PAUSE, cfs_fail_val);
 398                 GOTO(out, rc = 0);
 399         }
 400
 401         /*
 402          * Checking for various OBD_FAIL_$PREF_$OPC_NET codes. _Do_ not try
 403          * to put same checks into handlers like mdt_close(), mdt_reint(),
 404          * etc., without talking to mdt authors first. Checking same thing
 405          * there again is useless and returning 0 error without packing reply
 406          * is buggy! Handlers either pack reply or return error.
 407          *
 408          * We return 0 here and do not send any reply in order to emulate
 409          * network failure. Do not send any reply in case any of NET related
 410          * fail_id has occured.
 411          */
 412         if (OBD_FAIL_CHECK_ORSET(h->th_fail_id, OBD_FAIL_ONCE))
 413                 RETURN(0);
 414         if (unlikely(lustre_msg_get_opc(req->rq_reqmsg) == MDS_REINT &&
 415                      OBD_FAIL_CHECK(OBD_FAIL_MDS_REINT_MULTI_NET)))
 416                 RETURN(0);
 417
 418         rc = tgt_request_preprocess(tsi, h, req);
 419         /* pack reply if reply format is fixed */
 420         if (rc == 0 && h->th_flags & HAS_REPLY) {
 421                 /* Pack reply */
 422                 if (req_capsule_has_field(tsi->tsi_pill, &RMF_MDT_MD,
 423                                           RCL_SERVER))
 424                         req_capsule_set_size(tsi->tsi_pill, &RMF_MDT_MD,
 425                                              RCL_SERVER,
 426                                              tsi->tsi_mdt_body->mbo_eadatasize);
 427                 if (req_capsule_has_field(tsi->tsi_pill, &RMF_LOGCOOKIES,
 428                                           RCL_SERVER))
 429                         req_capsule_set_size(tsi->tsi_pill, &RMF_LOGCOOKIES,
 430                                              RCL_SERVER, 0);
 431                 if (req_capsule_has_field(tsi->tsi_pill, &RMF_ACL, RCL_SERVER))
 432                         req_capsule_set_size(tsi->tsi_pill,
 433                                              &RMF_ACL, RCL_SERVER,
 434                                              LUSTRE_POSIX_ACL_MAX_SIZE_OLD);
 435
 436                 if (req_capsule_has_field(tsi->tsi_pill, &RMF_SHORT_IO,
 437                                           RCL_SERVER)) {
 438                         struct niobuf_remote *remote_nb =
 439                                 req_capsule_client_get(tsi->tsi_pill,
 440                                                        &RMF_NIOBUF_REMOTE);
 441                         struct ost_body *body = tsi->tsi_ost_body;
 442
 443                         req_capsule_set_size(tsi->tsi_pill, &RMF_SHORT_IO,
 444                                          RCL_SERVER,
 445                                          (body->oa.o_valid & OBD_MD_FLFLAGS &&
 446                                           body->oa.o_flags & OBD_FL_SHORT_IO) ?
 447                                          remote_nb[0].rnb_len : 0);
 448                 }
 449
 450                 rc = req_capsule_server_pack(tsi->tsi_pill);
 451         }
 452
 453         if (likely(rc == 0)) {
 454                 /*
 455                  * Process request, there can be two types of rc:
 456                  * 1) errors with msg unpack/pack, other failures outside the
 457                  * operation itself. This is counted as serious errors;
 458                  * 2) errors during fs operation, should be placed in rq_status
 459                  * only
 460                  */
 461                 rc = h->th_act(tsi);
 462                 if (!is_serious(rc) &&
 463                     !req->rq_no_reply && req->rq_reply_state == NULL) {
 464                         DEBUG_REQ(D_ERROR, req,
 465                                   "%s: %s handler did not pack reply but returned no error",
 466                                   tgt_name(tsi->tsi_tgt), h->th_name);
 467                         LBUG();
 468                 }
 469                 serious = is_serious(rc);
 470                 rc = clear_serious(rc);
 471         } else {
 472                 serious = 1;
 473         }
 474
 475         req->rq_status = rc;
 476
 477         /*
 478          * ELDLM_* codes which > 0 should be in rq_status only as well as
 479          * all non-serious errors.
 480          */
 481         if (rc > 0 || !serious)
 482                 rc = 0;
 483
 484         LASSERT(current->journal_info == NULL);
 485
 486         if (likely(rc == 0 && req->rq_export))
 487                 target_committed_to_req(req);
 488
 489 out:
 490         target_send_reply(req, rc, tsi->tsi_reply_fail_id);
 491         RETURN(0);
 492 }
 493
 494 static int tgt_filter_recovery_request(struct ptlrpc_request *req,
 495                                        struct obd_device *obd, int *process)
 496 {
 497         switch (lustre_msg_get_opc(req->rq_reqmsg)) {
 498         case MDS_DISCONNECT:
 499         case OST_DISCONNECT:
 500         case OBD_IDX_READ:
 501                 *process = 1;
 502                 RETURN(0);
 503         case MDS_CLOSE:
 504         case MDS_SYNC: /* used in unmounting */
 505         case OBD_PING:
 506         case MDS_REINT:
 507         case OUT_UPDATE:
 508         case SEQ_QUERY:
 509         case FLD_QUERY:
 510         case FLD_READ:
 511         case LDLM_ENQUEUE:
 512         case OST_CREATE:
 513         case OST_DESTROY:
 514         case OST_PUNCH:
 515         case OST_SETATTR:
 516         case OST_SYNC:
 517         case OST_WRITE:
 518         case MDS_HSM_PROGRESS:
 519         case MDS_HSM_STATE_SET:
 520         case MDS_HSM_REQUEST:
 521                 *process = target_queue_recovery_request(req, obd);
 522                 RETURN(0);
 523
 524         default:
 525                 DEBUG_REQ(D_ERROR, req, "not permitted during recovery");
 526                 *process = -EAGAIN;
 527                 RETURN(0);
 528         }
 529 }
 530
 531 /*
 532  * Handle recovery. Return:
 533  *        +1: continue request processing;
 534  *       -ve: abort immediately with the given error code;
 535  *         0: send reply with error code in req->rq_status;
 536  */
 537 static int tgt_handle_recovery(struct ptlrpc_request *req, int reply_fail_id)
 538 {
 539         ENTRY;
 540
 541         switch (lustre_msg_get_opc(req->rq_reqmsg)) {
 542         case MDS_CONNECT:
 543         case OST_CONNECT:
 544         case MGS_CONNECT:
 545         case SEC_CTX_INIT:
 546         case SEC_CTX_INIT_CONT:
 547         case SEC_CTX_FINI:
 548                 RETURN(+1);
 549         }
 550
 551         if (!req->rq_export->exp_obd->obd_replayable)
 552                 RETURN(+1);
 553
 554         /* sanity check: if the xid matches, the request must be marked as a
 555          * resent or replayed */
 556         if (req_can_reconstruct(req, NULL) == 1) {
 557                 if (!(lustre_msg_get_flags(req->rq_reqmsg) &
 558                       (MSG_RESENT | MSG_REPLAY))) {
 559                         DEBUG_REQ(D_WARNING, req,
 560                                   "rq_xid=%llu matches saved XID, expected REPLAY or RESENT flag (%x)",
 561                                   req->rq_xid,
 562                                   lustre_msg_get_flags(req->rq_reqmsg));
 563                         req->rq_status = -ENOTCONN;
 564                         RETURN(-ENOTCONN);
 565                 }
 566         }
 567         /* else: note the opposite is not always true; a RESENT req after a
 568          * failover will usually not match the last_xid, since it was likely
 569          * never committed. A REPLAYed request will almost never match the
 570          * last xid, however it could for a committed, but still retained,
 571          * open. */
 572
 573         /* Check for aborted recovery... */
 574         if (unlikely(req->rq_export->exp_obd->obd_recovering)) {
 575                 int rc;
 576                 int should_process;
 577
 578                 DEBUG_REQ(D_INFO, req, "Got new replay");
 579                 rc = tgt_filter_recovery_request(req, req->rq_export->exp_obd,
 580                                                  &should_process);
 581                 if (rc != 0 || !should_process)
 582                         RETURN(rc);
 583                 else if (should_process < 0) {
 584                         req->rq_status = should_process;
 585                         rc = ptlrpc_error(req);
 586                         RETURN(rc);
 587                 }
 588         }
 589         RETURN(+1);
 590 }
 591
 592 /* Initial check for request, it is validation mostly */
 593 static struct tgt_handler *tgt_handler_find_check(struct ptlrpc_request *req)
 594 {
 595         struct tgt_handler      *h;
 596         struct tgt_opc_slice    *s;
 597         struct lu_target        *tgt;
 598         __u32                    opc = lustre_msg_get_opc(req->rq_reqmsg);
 599
 600         ENTRY;
 601
 602         tgt = class_exp2tgt(req->rq_export);
 603         if (unlikely(tgt == NULL)) {
 604                 DEBUG_REQ(D_ERROR, req, "%s: no target for connected export",
 605                           class_exp2obd(req->rq_export)->obd_name);
 606                 RETURN(ERR_PTR(-EINVAL));
 607         }
 608
 609         for (s = tgt->lut_slice; s->tos_hs != NULL; s++)
 610                 if (s->tos_opc_start <= opc && opc < s->tos_opc_end)
 611                         break;
 612
 613         /* opcode was not found in slice */
 614         if (unlikely(s->tos_hs == NULL)) {
 615                 CERROR("%s: no handlers for opcode 0x%x\n", tgt_name(tgt),
 616                        opc);
 617                 RETURN(ERR_PTR(-ENOTSUPP));
 618         }
 619
 620         LASSERT(opc >= s->tos_opc_start && opc < s->tos_opc_end);
 621         h = s->tos_hs + (opc - s->tos_opc_start);
 622         if (unlikely(h->th_opc == 0)) {
 623                 CERROR("%s: unsupported opcode 0x%x\n", tgt_name(tgt), opc);
 624                 RETURN(ERR_PTR(-ENOTSUPP));
 625         }
 626
 627         RETURN(h);
 628 }
 629
 630 static int process_req_last_xid(struct ptlrpc_request *req)
 631 {
 632         __u64   last_xid;
 633         int rc = 0;
 634         struct obd_export *exp = req->rq_export;
 635         struct tg_export_data *ted = &exp->exp_target_data;
 636         bool need_lock = tgt_is_multimodrpcs_client(exp);
 637         ENTRY;
 638
 639         if (need_lock)
 640                 mutex_lock(&ted->ted_lcd_lock);
 641         /* check request's xid is consistent with export's last_xid */
 642         last_xid = lustre_msg_get_last_xid(req->rq_reqmsg);
 643         if (last_xid > exp->exp_last_xid)
 644                 exp->exp_last_xid = last_xid;
 645
 646         if (req->rq_xid == 0 || req->rq_xid <= exp->exp_last_xid) {
 647                 /* Some request is allowed to be sent during replay,
 648                  * such as OUT update requests, FLD requests, so it
 649                  * is possible that replay requests has smaller XID
 650                  * than the exp_last_xid.
 651                  *
 652                  * Some non-replay requests may have smaller XID as
 653                  * well:
 654                  *
 655                  * - Client send a no_resend RPC, like statfs;
 656                  * - The RPC timedout (or some other error) on client,
 657                  *   then it's removed from the unreplied list;
 658                  * - Client send some other request to bump the
 659                  *   exp_last_xid on server;
 660                  * - The former RPC got chance to be processed;
 661                  */
 662                 if (!(lustre_msg_get_flags(req->rq_reqmsg) & MSG_REPLAY))
 663                         rc = -EPROTO;
 664
 665                 DEBUG_REQ(D_WARNING, req,
 666                           "unexpected xid=%llx != exp_last_xid=%llx, rc = %d",
 667                           req->rq_xid, exp->exp_last_xid, rc);
 668                 if (rc)
 669                         GOTO(out, rc);
 670         }
 671
 672         /* The "last_xid" is the minimum xid among unreplied requests,
 673          * if the request is from the previous connection, its xid can
 674          * still be larger than "exp_last_xid", then the above check of
 675          * xid is not enough to determine whether the request is delayed.
 676          *
 677          * For example, if some replay request was delayed and caused
 678          * timeout at client and the replay is restarted, the delayed
 679          * replay request will have the larger xid than "exp_last_xid"
 680          */
 681         if (req->rq_export->exp_conn_cnt >
 682             lustre_msg_get_conn_cnt(req->rq_reqmsg))
 683                 GOTO(out, rc = -ESTALE);
 684
 685         /* try to release in-memory reply data */
 686         if (tgt_is_multimodrpcs_client(exp)) {
 687                 tgt_handle_received_xid(exp, last_xid);
 688                 rc = tgt_handle_tag(req);
 689         }
 690
 691 out:
 692         if (need_lock)
 693                 mutex_unlock(&ted->ted_lcd_lock);
 694
 695         RETURN(rc);
 696 }
 697
 698 int tgt_request_handle(struct ptlrpc_request *req)
 699 {
 700         struct tgt_session_info *tsi = tgt_ses_info(req->rq_svc_thread->t_env);
 701
 702         struct lustre_msg       *msg = req->rq_reqmsg;
 703         struct tgt_handler      *h;
 704         struct lu_target        *tgt;
 705         int                      request_fail_id = 0;
 706         __u32                    opc = lustre_msg_get_opc(msg);
 707         struct obd_device       *obd;
 708         int                      rc;
 709         bool                     is_connect = false;
 710         ENTRY;
 711
 712         if (unlikely(OBD_FAIL_CHECK(OBD_FAIL_TGT_RECOVERY_REQ_RACE))) {
 713                 if (cfs_fail_val == 0 &&
 714                     lustre_msg_get_opc(msg) != OBD_PING &&
 715                     lustre_msg_get_flags(msg) & MSG_REQ_REPLAY_DONE) {
 716                         struct l_wait_info lwi =  { 0 };
 717
 718                         cfs_fail_val = 1;
 719                         cfs_race_state = 0;
 720                         l_wait_event(cfs_race_waitq, (cfs_race_state == 1),
 721                                      &lwi);
 722                 }
 723         }
 724
 725         /* Refill the context, to make sure all thread keys are allocated */
 726         lu_env_refill(req->rq_svc_thread->t_env);
 727
 728         req_capsule_init(&req->rq_pill, req, RCL_SERVER);
 729         tsi->tsi_pill = &req->rq_pill;
 730         tsi->tsi_env = req->rq_svc_thread->t_env;
 731
 732         /* if request has export then get handlers slice from corresponding
 733          * target, otherwise that should be connect operation */
 734         if (opc == MDS_CONNECT || opc == OST_CONNECT ||
 735             opc == MGS_CONNECT) {
 736                 is_connect = true;
 737                 req_capsule_set(&req->rq_pill, &RQF_CONNECT);
 738                 rc = target_handle_connect(req);
 739                 if (rc != 0) {
 740                         rc = ptlrpc_error(req);
 741                         GOTO(out, rc);
 742                 }
 743                 /* recovery-small test 18c asks to drop connect reply */
 744                 if (unlikely(opc == OST_CONNECT &&
 745                              OBD_FAIL_CHECK(OBD_FAIL_OST_CONNECT_NET2)))
 746                         GOTO(out, rc = 0);
 747         }
 748
 749         if (unlikely(!class_connected_export(req->rq_export))) {
 750                 if (opc == SEC_CTX_INIT || opc == SEC_CTX_INIT_CONT ||
 751                     opc == SEC_CTX_FINI) {
 752                         /* sec context initialization has to be handled
 753                          * by hand in tgt_handle_request0() */
 754                         tsi->tsi_reply_fail_id = OBD_FAIL_SEC_CTX_INIT_NET;
 755                         h = NULL;
 756                         GOTO(handle_recov, rc = 0);
 757                 }
 758                 CDEBUG(D_HA, "operation %d on unconnected OST from %s\n",
 759                        opc, libcfs_id2str(req->rq_peer));
 760                 req->rq_status = -ENOTCONN;
 761                 rc = ptlrpc_error(req);
 762                 GOTO(out, rc);
 763         }
 764
 765         tsi->tsi_tgt = tgt = class_exp2tgt(req->rq_export);
 766         tsi->tsi_exp = req->rq_export;
 767         if (exp_connect_flags(req->rq_export) & OBD_CONNECT_JOBSTATS)
 768                 tsi->tsi_jobid = lustre_msg_get_jobid(req->rq_reqmsg);
 769         else
 770                 tsi->tsi_jobid = NULL;
 771
 772         if (tgt == NULL) {
 773                 DEBUG_REQ(D_ERROR, req, "%s: No target for connected export",
 774                           class_exp2obd(req->rq_export)->obd_name);
 775                 req->rq_status = -EINVAL;
 776                 rc = ptlrpc_error(req);
 777                 GOTO(out, rc);
 778         }
 779
 780         /* Skip last_xid processing for the recovery thread, otherwise, the
 781          * last_xid on same request could be processed twice: first time when
 782          * processing the incoming request, second time when the request is
 783          * being processed by recovery thread. */
 784         obd = class_exp2obd(req->rq_export);
 785         if (is_connect) {
 786                 /* reset the exp_last_xid on each connection. */
 787                 req->rq_export->exp_last_xid = 0;
 788         } else if (obd->obd_recovery_data.trd_processing_task !=
 789                    current_pid()) {
 790                 rc = process_req_last_xid(req);
 791                 if (rc) {
 792                         req->rq_status = rc;
 793                         rc = ptlrpc_error(req);
 794                         GOTO(out, rc);
 795                 }
 796         }
 797
 798         request_fail_id = tgt->lut_request_fail_id;
 799         tsi->tsi_reply_fail_id = tgt->lut_reply_fail_id;
 800
 801         h = tgt_handler_find_check(req);
 802         if (IS_ERR(h)) {
 803                 req->rq_status = PTR_ERR(h);
 804                 rc = ptlrpc_error(req);
 805                 GOTO(out, rc);
 806         }
 807
 808         LASSERTF(h->th_opc == opc, "opcode mismatch %d != %d\n",
 809                  h->th_opc, opc);
 810
 811         if ((cfs_fail_val == 0 || cfs_fail_val == opc) &&
 812              CFS_FAIL_CHECK_ORSET(request_fail_id, CFS_FAIL_ONCE))
 813                 GOTO(out, rc = 0);
 814
 815         rc = lustre_msg_check_version(msg, h->th_version);
 816         if (unlikely(rc)) {
 817                 DEBUG_REQ(D_ERROR, req,
 818                           "%s: drop malformed request version=%08x expect=%08x",
 819                           tgt_name(tgt), lustre_msg_get_version(msg),
 820                           h->th_version);
 821                 req->rq_status = -EINVAL;
 822                 rc = ptlrpc_error(req);
 823                 GOTO(out, rc);
 824         }
 825
 826 handle_recov:
 827         rc = tgt_handle_recovery(req, tsi->tsi_reply_fail_id);
 828         if (likely(rc == 1)) {
 829                 rc = tgt_handle_request0(tsi, h, req);
 830                 if (rc)
 831                         GOTO(out, rc);
 832         }
 833         EXIT;
 834 out:
 835         req_capsule_fini(tsi->tsi_pill);
 836         if (tsi->tsi_corpus != NULL) {
 837                 lu_object_put(tsi->tsi_env, tsi->tsi_corpus);
 838                 tsi->tsi_corpus = NULL;
 839         }
 840         return rc;
 841 }
 842 EXPORT_SYMBOL(tgt_request_handle);
 843
 844 /** Assign high priority operations to the request if needed. */
 845 int tgt_hpreq_handler(struct ptlrpc_request *req)
 846 {
 847         struct tgt_session_info *tsi = tgt_ses_info(req->rq_svc_thread->t_env);
 848         struct tgt_handler      *h;
 849         int                      rc;
 850
 851         ENTRY;
 852
 853         if (req->rq_export == NULL)
 854                 RETURN(0);
 855
 856         req_capsule_init(&req->rq_pill, req, RCL_SERVER);
 857         tsi->tsi_pill = &req->rq_pill;
 858         tsi->tsi_env = req->rq_svc_thread->t_env;
 859         tsi->tsi_tgt = class_exp2tgt(req->rq_export);
 860         tsi->tsi_exp = req->rq_export;
 861
 862         h = tgt_handler_find_check(req);
 863         if (IS_ERR(h)) {
 864                 rc = PTR_ERR(h);
 865                 RETURN(rc);
 866         }
 867
 868         rc = tgt_request_preprocess(tsi, h, req);
 869         if (unlikely(rc != 0))
 870                 RETURN(rc);
 871
 872         if (h->th_hp != NULL)
 873                 h->th_hp(tsi);
 874         RETURN(0);
 875 }
 876 EXPORT_SYMBOL(tgt_hpreq_handler);
 877
 878 void tgt_counter_incr(struct obd_export *exp, int opcode)
 879 {
 880         lprocfs_counter_incr(exp->exp_obd->obd_stats, opcode);
 881         if (exp->exp_nid_stats && exp->exp_nid_stats->nid_stats != NULL)
 882                 lprocfs_counter_incr(exp->exp_nid_stats->nid_stats, opcode);
 883 }
 884 EXPORT_SYMBOL(tgt_counter_incr);
 885
 886 /*
 887  * Unified target generic handlers.
 888  */
 889
 890 int tgt_connect_check_sptlrpc(struct ptlrpc_request *req, struct obd_export *exp)
 891 {
 892         struct lu_target        *tgt = class_exp2tgt(exp);
 893         struct sptlrpc_flavor    flvr;
 894         int                      rc = 0;
 895
 896         LASSERT(tgt);
 897         LASSERT(tgt->lut_obd);
 898         LASSERT(tgt->lut_slice);
 899
 900         /* always allow ECHO client */
 901         if (unlikely(strcmp(exp->exp_obd->obd_type->typ_name,
 902                             LUSTRE_ECHO_NAME) == 0)) {
 903                 exp->exp_flvr.sf_rpc = SPTLRPC_FLVR_ANY;
 904                 return 0;
 905         }
 906
 907         if (exp->exp_flvr.sf_rpc == SPTLRPC_FLVR_INVALID) {
 908                 read_lock(&tgt->lut_sptlrpc_lock);
 909                 sptlrpc_target_choose_flavor(&tgt->lut_sptlrpc_rset,
 910                                              req->rq_sp_from,
 911                                              req->rq_peer.nid,
 912                                              &flvr);
 913                 read_unlock(&tgt->lut_sptlrpc_lock);
 914
 915                 spin_lock(&exp->exp_lock);
 916                 exp->exp_sp_peer = req->rq_sp_from;
 917                 exp->exp_flvr = flvr;
 918
 919                 /* when on mgs, if no restriction is set, or if client
 920                  * is loopback, allow any flavor */
 921                 if ((strcmp(exp->exp_obd->obd_type->typ_name,
 922                            LUSTRE_MGS_NAME) == 0) &&
 923                      (exp->exp_flvr.sf_rpc == SPTLRPC_FLVR_NULL ||
 924                       LNET_NETTYP(LNET_NIDNET(exp->exp_connection->c_peer.nid))
 925                       == LOLND))
 926                         exp->exp_flvr.sf_rpc = SPTLRPC_FLVR_ANY;
 927
 928                 if (exp->exp_flvr.sf_rpc != SPTLRPC_FLVR_ANY &&
 929                     exp->exp_flvr.sf_rpc != req->rq_flvr.sf_rpc) {
 930                         CERROR("%s: unauthorized rpc flavor %x from %s, "
 931                                "expect %x\n", tgt_name(tgt),
 932                                req->rq_flvr.sf_rpc,
 933                                libcfs_nid2str(req->rq_peer.nid),
 934                                exp->exp_flvr.sf_rpc);
 935                         rc = -EACCES;
 936                 }
 937                 spin_unlock(&exp->exp_lock);
 938         } else {
 939                 if (exp->exp_sp_peer != req->rq_sp_from) {
 940                         CERROR("%s: RPC source %s doesn't match %s\n",
 941                                tgt_name(tgt),
 942                                sptlrpc_part2name(req->rq_sp_from),
 943                                sptlrpc_part2name(exp->exp_sp_peer));
 944                         rc = -EACCES;
 945                 } else {
 946                         rc = sptlrpc_target_export_check(exp, req);
 947                 }
 948         }
 949
 950         return rc;
 951 }
 952
 953 int tgt_adapt_sptlrpc_conf(struct lu_target *tgt)
 954 {
 955         struct sptlrpc_rule_set  tmp_rset;
 956         int                      rc;
 957
 958         if (unlikely(tgt == NULL)) {
 959                 CERROR("No target passed");
 960                 return -EINVAL;
 961         }
 962
 963         sptlrpc_rule_set_init(&tmp_rset);
 964         rc = sptlrpc_conf_target_get_rules(tgt->lut_obd, &tmp_rset);
 965         if (rc) {
 966                 CERROR("%s: failed get sptlrpc rules: rc = %d\n",
 967                        tgt_name(tgt), rc);
 968                 return rc;
 969         }
 970
 971         sptlrpc_target_update_exp_flavor(tgt->lut_obd, &tmp_rset);
 972
 973         write_lock(&tgt->lut_sptlrpc_lock);
 974         sptlrpc_rule_set_free(&tgt->lut_sptlrpc_rset);
 975         tgt->lut_sptlrpc_rset = tmp_rset;
 976         write_unlock(&tgt->lut_sptlrpc_lock);
 977
 978         return 0;
 979 }
 980 EXPORT_SYMBOL(tgt_adapt_sptlrpc_conf);
 981
 982 int tgt_connect(struct tgt_session_info *tsi)
 983 {
 984         struct ptlrpc_request   *req = tgt_ses_req(tsi);
 985         struct obd_connect_data *reply;
 986         int                      rc;
 987
 988         ENTRY;
 989
 990         /* XXX: better to call this check right after getting new export but
 991          * before last_rcvd slot allocation to avoid server load upon insecure
 992          * connects. This is to be fixed after unifiyng all targets.
 993          */
 994         rc = tgt_connect_check_sptlrpc(req, tsi->tsi_exp);
 995         if (rc)
 996                 GOTO(out, rc);
 997
 998         /* To avoid exposing partially initialized connection flags, changes up
 999          * to this point have been staged in reply->ocd_connect_flags. Now that
1000          * connection handling has completed successfully, atomically update
1001          * the connect flags in the shared export data structure. LU-1623 */
1002         reply = req_capsule_server_get(tsi->tsi_pill, &RMF_CONNECT_DATA);
1003         spin_lock(&tsi->tsi_exp->exp_lock);
1004         *exp_connect_flags_ptr(tsi->tsi_exp) = reply->ocd_connect_flags;
1005         if (reply->ocd_connect_flags & OBD_CONNECT_FLAGS2)
1006                 *exp_connect_flags2_ptr(tsi->tsi_exp) =
1007                         reply->ocd_connect_flags2;
1008         tsi->tsi_exp->exp_connect_data.ocd_brw_size = reply->ocd_brw_size;
1009         spin_unlock(&tsi->tsi_exp->exp_lock);
1010
1011         if (strcmp(tsi->tsi_exp->exp_obd->obd_type->typ_name,
1012                    LUSTRE_MDT_NAME) == 0) {
1013                 rc = req_check_sepol(tsi->tsi_pill);
1014                 if (rc)
1015                         GOTO(out, rc);
1016         }
1017
1018         RETURN(0);
1019 out:
1020         obd_disconnect(class_export_get(tsi->tsi_exp));
1021         return rc;
1022 }
1023 EXPORT_SYMBOL(tgt_connect);
1024
1025 int tgt_disconnect(struct tgt_session_info *tsi)
1026 {
1027         int rc;
1028
1029         ENTRY;
1030
1031         OBD_FAIL_TIMEOUT(OBD_FAIL_OST_DISCONNECT_DELAY, cfs_fail_val);
1032
1033         rc = target_handle_disconnect(tgt_ses_req(tsi));
1034         if (rc)
1035                 RETURN(err_serious(rc));
1036
1037         RETURN(rc);
1038 }
1039 EXPORT_SYMBOL(tgt_disconnect);
1040
1041 /*
1042  * Unified target OBD handlers
1043  */
1044 int tgt_obd_ping(struct tgt_session_info *tsi)
1045 {
1046         int rc;
1047
1048         ENTRY;
1049
1050         /* The target-specific part of OBD_PING request handling.
1051          * It controls Filter Modification Data (FMD) expiration each time
1052          * PING is received.
1053          *
1054          * Valid only for replayable targets, e.g. MDT and OFD
1055          */
1056         if (tsi->tsi_exp->exp_obd->obd_replayable)
1057                 tgt_fmd_expire(tsi->tsi_exp);
1058
1059         rc = req_capsule_server_pack(tsi->tsi_pill);
1060         if (rc)
1061                 RETURN(err_serious(rc));
1062
1063         RETURN(rc);
1064 }
1065 EXPORT_SYMBOL(tgt_obd_ping);
1066
1067 int tgt_obd_log_cancel(struct tgt_session_info *tsi)
1068 {
1069         return err_serious(-EOPNOTSUPP);
1070 }
1071
1072 int tgt_send_buffer(struct tgt_session_info *tsi, struct lu_rdbuf *rdbuf)
1073 {
1074         struct ptlrpc_request   *req = tgt_ses_req(tsi);
1075         struct obd_export       *exp = req->rq_export;
1076         struct ptlrpc_bulk_desc *desc;
1077         int                      i;
1078         int                      rc;
1079
1080         ENTRY;
1081
1082         desc = ptlrpc_prep_bulk_exp(req, rdbuf->rb_nbufs, 1,
1083                                   PTLRPC_BULK_PUT_SOURCE | PTLRPC_BULK_BUF_KVEC,
1084                                     MDS_BULK_PORTAL, &ptlrpc_bulk_kvec_ops);
1085         if (desc == NULL)
1086                 RETURN(-ENOMEM);
1087
1088         for (i = 0; i < rdbuf->rb_nbufs; i++)
1089                 desc->bd_frag_ops->add_iov_frag(desc,
1090                                         rdbuf->rb_bufs[i].lb_buf,
1091                                         rdbuf->rb_bufs[i].lb_len);
1092
1093         rc = target_bulk_io(exp, desc);
1094         ptlrpc_free_bulk(desc);
1095         RETURN(rc);
1096 }
1097 EXPORT_SYMBOL(tgt_send_buffer);
1098
1099 int tgt_sendpage(struct tgt_session_info *tsi, struct lu_rdpg *rdpg, int nob)
1100 {
1101         struct ptlrpc_request   *req = tgt_ses_req(tsi);
1102         struct obd_export       *exp = req->rq_export;
1103         struct ptlrpc_bulk_desc *desc;
1104         int                      tmpcount;
1105         int                      tmpsize;
1106         int                      i;
1107         int                      rc;
1108
1109         ENTRY;
1110
1111         desc = ptlrpc_prep_bulk_exp(req, rdpg->rp_npages, 1,
1112                                     PTLRPC_BULK_PUT_SOURCE |
1113                                         PTLRPC_BULK_BUF_KIOV,
1114                                     MDS_BULK_PORTAL,
1115                                     &ptlrpc_bulk_kiov_pin_ops);
1116         if (desc == NULL)
1117                 RETURN(-ENOMEM);
1118
1119         if (!(exp_connect_flags(exp) & OBD_CONNECT_BRW_SIZE))
1120                 /* old client requires reply size in it's PAGE_SIZE,
1121                  * which is rdpg->rp_count */
1122                 nob = rdpg->rp_count;
1123
1124         for (i = 0, tmpcount = nob; i < rdpg->rp_npages && tmpcount > 0;
1125              i++, tmpcount -= tmpsize) {
1126                 tmpsize = min_t(int, tmpcount, PAGE_SIZE);
1127                 desc->bd_frag_ops->add_kiov_frag(desc, rdpg->rp_pages[i], 0,
1128                                                  tmpsize);
1129         }
1130
1131         LASSERT(desc->bd_nob == nob);
1132         rc = target_bulk_io(exp, desc);
1133         ptlrpc_free_bulk(desc);
1134         RETURN(rc);
1135 }
1136 EXPORT_SYMBOL(tgt_sendpage);
1137
1138 /*
1139  * OBD_IDX_READ handler
1140  */
1141 static int tgt_obd_idx_read(struct tgt_session_info *tsi)
1142 {
1143         struct tgt_thread_info  *tti = tgt_th_info(tsi->tsi_env);
1144         struct lu_rdpg          *rdpg = &tti->tti_u.rdpg.tti_rdpg;
1145         struct idx_info         *req_ii, *rep_ii;
1146         int                      rc, i;
1147
1148         ENTRY;
1149
1150         memset(rdpg, 0, sizeof(*rdpg));
1151         req_capsule_set(tsi->tsi_pill, &RQF_OBD_IDX_READ);
1152
1153         /* extract idx_info buffer from request & reply */
1154         req_ii = req_capsule_client_get(tsi->tsi_pill, &RMF_IDX_INFO);
1155         if (req_ii == NULL || req_ii->ii_magic != IDX_INFO_MAGIC)
1156                 RETURN(err_serious(-EPROTO));
1157
1158         rc = req_capsule_server_pack(tsi->tsi_pill);
1159         if (rc)
1160                 RETURN(err_serious(rc));
1161
1162         rep_ii = req_capsule_server_get(tsi->tsi_pill, &RMF_IDX_INFO);
1163         if (rep_ii == NULL)
1164                 RETURN(err_serious(-EFAULT));
1165         rep_ii->ii_magic = IDX_INFO_MAGIC;
1166
1167         /* extract hash to start with */
1168         rdpg->rp_hash = req_ii->ii_hash_start;
1169
1170         /* extract requested attributes */
1171         rdpg->rp_attrs = req_ii->ii_attrs;
1172
1173         /* check that fid packed in request is valid and supported */
1174         if (!fid_is_sane(&req_ii->ii_fid))
1175                 RETURN(-EINVAL);
1176         rep_ii->ii_fid = req_ii->ii_fid;
1177
1178         /* copy flags */
1179         rep_ii->ii_flags = req_ii->ii_flags;
1180
1181         /* compute number of pages to allocate, ii_count is the number of 4KB
1182          * containers */
1183         if (req_ii->ii_count <= 0)
1184                 GOTO(out, rc = -EFAULT);
1185         rdpg->rp_count = min_t(unsigned int, req_ii->ii_count << LU_PAGE_SHIFT,
1186                                exp_max_brw_size(tsi->tsi_exp));
1187         rdpg->rp_npages = (rdpg->rp_count + PAGE_SIZE - 1) >> PAGE_SHIFT;
1188
1189         /* allocate pages to store the containers */
1190         OBD_ALLOC(rdpg->rp_pages, rdpg->rp_npages * sizeof(rdpg->rp_pages[0]));
1191         if (rdpg->rp_pages == NULL)
1192                 GOTO(out, rc = -ENOMEM);
1193         for (i = 0; i < rdpg->rp_npages; i++) {
1194                 rdpg->rp_pages[i] = alloc_page(GFP_NOFS);
1195                 if (rdpg->rp_pages[i] == NULL)
1196                         GOTO(out, rc = -ENOMEM);
1197         }
1198
1199         /* populate pages with key/record pairs */
1200         rc = dt_index_read(tsi->tsi_env, tsi->tsi_tgt->lut_bottom, rep_ii, rdpg);
1201         if (rc < 0)
1202                 GOTO(out, rc);
1203
1204         LASSERTF(rc <= rdpg->rp_count, "dt_index_read() returned more than "
1205                  "asked %d > %d\n", rc, rdpg->rp_count);
1206
1207         /* send pages to client */
1208         rc = tgt_sendpage(tsi, rdpg, rc);
1209         if (rc)
1210                 GOTO(out, rc);
1211         EXIT;
1212 out:
1213         if (rdpg->rp_pages) {
1214                 for (i = 0; i < rdpg->rp_npages; i++)
1215                         if (rdpg->rp_pages[i])
1216                                 __free_page(rdpg->rp_pages[i]);
1217                 OBD_FREE(rdpg->rp_pages,
1218                          rdpg->rp_npages * sizeof(rdpg->rp_pages[0]));
1219         }
1220         return rc;
1221 }
1222
1223 struct tgt_handler tgt_obd_handlers[] = {
1224 TGT_OBD_HDL    (0,      OBD_PING,               tgt_obd_ping),
1225 TGT_OBD_HDL    (0,      OBD_IDX_READ,           tgt_obd_idx_read)
1226 };
1227 EXPORT_SYMBOL(tgt_obd_handlers);
1228
1229 int tgt_sync(const struct lu_env *env, struct lu_target *tgt,
1230              struct dt_object *obj, __u64 start, __u64 end)
1231 {
1232         int rc = 0;
1233
1234         ENTRY;
1235
1236         /* if no objid is specified, it means "sync whole filesystem" */
1237         if (obj == NULL) {
1238                 rc = dt_sync(env, tgt->lut_bottom);
1239         } else if (dt_version_get(env, obj) >
1240                    tgt->lut_obd->obd_last_committed) {
1241                 rc = dt_object_sync(env, obj, start, end);
1242         }
1243         atomic_inc(&tgt->lut_sync_count);
1244
1245         RETURN(rc);
1246 }
1247 EXPORT_SYMBOL(tgt_sync);
1248 /*
1249  * Unified target DLM handlers.
1250  */
1251
1252 /**
1253  * Unified target BAST
1254  *
1255  * Ensure data and metadata are synced to disk when lock is canceled if Sync on
1256  * Cancel (SOC) is enabled. If it's extent lock, normally sync obj is enough,
1257  * but if it's cross-MDT lock, because remote object version is not set, a
1258  * filesystem sync is needed.
1259  *
1260  * \param lock server side lock
1261  * \param desc lock desc
1262  * \param data ldlm_cb_set_arg
1263  * \param flag  indicates whether this cancelling or blocking callback
1264  * \retval      0 on success
1265  * \retval      negative number on error
1266  */
1267 static int tgt_blocking_ast(struct ldlm_lock *lock, struct ldlm_lock_desc *desc,
1268                             void *data, int flag)
1269 {
1270         struct lu_env            env;
1271         struct lu_target        *tgt;
1272         struct dt_object        *obj = NULL;
1273         struct lu_fid            fid;
1274         int                      rc = 0;
1275
1276         ENTRY;
1277
1278         tgt = class_exp2tgt(lock->l_export);
1279
1280         if (unlikely(tgt == NULL)) {
1281                 CDEBUG(D_ERROR, "%s: No target for connected export\n",
1282                        class_exp2obd(lock->l_export)->obd_name);
1283                 RETURN(-EINVAL);
1284         }
1285
1286         if (flag == LDLM_CB_CANCELING &&
1287             (lock->l_granted_mode & (LCK_EX | LCK_PW | LCK_GROUP)) &&
1288             (tgt->lut_sync_lock_cancel == ALWAYS_SYNC_ON_CANCEL ||
1289              (tgt->lut_sync_lock_cancel == BLOCKING_SYNC_ON_CANCEL &&
1290               ldlm_is_cbpending(lock))) &&
1291             ((exp_connect_flags(lock->l_export) & OBD_CONNECT_MDS_MDS) ||
1292              lock->l_resource->lr_type == LDLM_EXTENT)) {
1293                 __u64 start = 0;
1294                 __u64 end = OBD_OBJECT_EOF;
1295
1296                 rc = lu_env_init(&env, LCT_DT_THREAD);
1297                 if (unlikely(rc != 0))
1298                         GOTO(err, rc);
1299
1300                 ost_fid_from_resid(&fid, &lock->l_resource->lr_name,
1301                                    tgt->lut_lsd.lsd_osd_index);
1302
1303                 if (lock->l_resource->lr_type == LDLM_EXTENT) {
1304                         obj = dt_locate(&env, tgt->lut_bottom, &fid);
1305                         if (IS_ERR(obj))
1306                                 GOTO(err_env, rc = PTR_ERR(obj));
1307
1308                         if (!dt_object_exists(obj))
1309                                 GOTO(err_put, rc = -ENOENT);
1310
1311                         start = lock->l_policy_data.l_extent.start;
1312                         end = lock->l_policy_data.l_extent.end;
1313                 }
1314
1315                 rc = tgt_sync(&env, tgt, obj, start, end);
1316                 if (rc < 0) {
1317                         CERROR("%s: syncing "DFID" (%llu-%llu) on lock "
1318                                "cancel: rc = %d\n",
1319                                tgt_name(tgt), PFID(&fid),
1320                                lock->l_policy_data.l_extent.start,
1321                                lock->l_policy_data.l_extent.end, rc);
1322                 }
1323 err_put:
1324                 if (obj != NULL)
1325                         dt_object_put(&env, obj);
1326 err_env:
1327                 lu_env_fini(&env);
1328         }
1329 err:
1330         rc = ldlm_server_blocking_ast(lock, desc, data, flag);
1331         RETURN(rc);
1332 }
1333
1334 static struct ldlm_callback_suite tgt_dlm_cbs = {
1335         .lcs_completion = ldlm_server_completion_ast,
1336         .lcs_blocking   = tgt_blocking_ast,
1337         .lcs_glimpse    = ldlm_server_glimpse_ast
1338 };
1339
1340 int tgt_enqueue(struct tgt_session_info *tsi)
1341 {
1342         struct ptlrpc_request *req = tgt_ses_req(tsi);
1343         int rc;
1344
1345         ENTRY;
1346         /*
1347          * tsi->tsi_dlm_req was already swapped and (if necessary) converted,
1348          * tsi->tsi_dlm_cbs was set by the *_req_handle() function.
1349          */
1350         LASSERT(tsi->tsi_dlm_req != NULL);
1351         rc = ldlm_handle_enqueue0(tsi->tsi_exp->exp_obd->obd_namespace, req,
1352                                   tsi->tsi_dlm_req, &tgt_dlm_cbs);
1353         if (rc)
1354                 RETURN(err_serious(rc));
1355
1356         switch (LUT_FAIL_CLASS(tsi->tsi_reply_fail_id)) {
1357         case LUT_FAIL_MDT:
1358                 tsi->tsi_reply_fail_id = OBD_FAIL_MDS_LDLM_REPLY_NET;
1359                 break;
1360         case LUT_FAIL_OST:
1361                 tsi->tsi_reply_fail_id = OBD_FAIL_OST_LDLM_REPLY_NET;
1362                 break;
1363         case LUT_FAIL_MGT:
1364                 tsi->tsi_reply_fail_id = OBD_FAIL_MGS_LDLM_REPLY_NET;
1365                 break;
1366         default:
1367                 tsi->tsi_reply_fail_id = OBD_FAIL_LDLM_REPLY;
1368                 break;
1369         }
1370         RETURN(req->rq_status);
1371 }
1372 EXPORT_SYMBOL(tgt_enqueue);
1373
1374 int tgt_convert(struct tgt_session_info *tsi)
1375 {
1376         struct ptlrpc_request *req = tgt_ses_req(tsi);
1377         int rc;
1378
1379         ENTRY;
1380         LASSERT(tsi->tsi_dlm_req);
1381         rc = ldlm_handle_convert0(req, tsi->tsi_dlm_req);
1382         if (rc)
1383                 RETURN(err_serious(rc));
1384
1385         RETURN(req->rq_status);
1386 }
1387
1388 int tgt_bl_callback(struct tgt_session_info *tsi)
1389 {
1390         return err_serious(-EOPNOTSUPP);
1391 }
1392
1393 int tgt_cp_callback(struct tgt_session_info *tsi)
1394 {
1395         return err_serious(-EOPNOTSUPP);
1396 }
1397
1398 /* generic LDLM target handler */
1399 struct tgt_handler tgt_dlm_handlers[] = {
1400 TGT_DLM_HDL(HAS_KEY, LDLM_ENQUEUE, tgt_enqueue),
1401 TGT_DLM_HDL(HAS_KEY, LDLM_CONVERT, tgt_convert),
1402 TGT_DLM_HDL_VAR(0, LDLM_BL_CALLBACK, tgt_bl_callback),
1403 TGT_DLM_HDL_VAR(0, LDLM_CP_CALLBACK, tgt_cp_callback)
1404 };
1405 EXPORT_SYMBOL(tgt_dlm_handlers);
1406
1407 /*
1408  * Unified target LLOG handlers.
1409  */
1410 int tgt_llog_open(struct tgt_session_info *tsi)
1411 {
1412         int rc;
1413
1414         ENTRY;
1415
1416         rc = llog_origin_handle_open(tgt_ses_req(tsi));
1417
1418         RETURN(rc);
1419 }
1420 EXPORT_SYMBOL(tgt_llog_open);
1421
1422 int tgt_llog_read_header(struct tgt_session_info *tsi)
1423 {
1424         int rc;
1425
1426         ENTRY;
1427
1428         rc = llog_origin_handle_read_header(tgt_ses_req(tsi));
1429
1430         RETURN(rc);
1431 }
1432 EXPORT_SYMBOL(tgt_llog_read_header);
1433
1434 int tgt_llog_next_block(struct tgt_session_info *tsi)
1435 {
1436         int rc;
1437
1438         ENTRY;
1439
1440         rc = llog_origin_handle_next_block(tgt_ses_req(tsi));
1441
1442         RETURN(rc);
1443 }
1444 EXPORT_SYMBOL(tgt_llog_next_block);
1445
1446 int tgt_llog_prev_block(struct tgt_session_info *tsi)
1447 {
1448         int rc;
1449
1450         ENTRY;
1451
1452         rc = llog_origin_handle_prev_block(tgt_ses_req(tsi));
1453
1454         RETURN(rc);
1455 }
1456 EXPORT_SYMBOL(tgt_llog_prev_block);
1457
1458 /* generic llog target handler */
1459 struct tgt_handler tgt_llog_handlers[] = {
1460 TGT_LLOG_HDL    (0,     LLOG_ORIGIN_HANDLE_CREATE,      tgt_llog_open),
1461 TGT_LLOG_HDL    (0,     LLOG_ORIGIN_HANDLE_NEXT_BLOCK,  tgt_llog_next_block),
1462 TGT_LLOG_HDL    (0,     LLOG_ORIGIN_HANDLE_READ_HEADER, tgt_llog_read_header),
1463 TGT_LLOG_HDL    (0,     LLOG_ORIGIN_HANDLE_PREV_BLOCK,  tgt_llog_prev_block),
1464 };
1465 EXPORT_SYMBOL(tgt_llog_handlers);
1466
1467 /*
1468  * sec context handlers
1469  */
1470 /* XXX: Implement based on mdt_sec_ctx_handle()? */
1471 static int tgt_sec_ctx_handle(struct tgt_session_info *tsi)
1472 {
1473         return 0;
1474 }
1475
1476 struct tgt_handler tgt_sec_ctx_handlers[] = {
1477 TGT_SEC_HDL_VAR(0,      SEC_CTX_INIT,           tgt_sec_ctx_handle),
1478 TGT_SEC_HDL_VAR(0,      SEC_CTX_INIT_CONT,      tgt_sec_ctx_handle),
1479 TGT_SEC_HDL_VAR(0,      SEC_CTX_FINI,           tgt_sec_ctx_handle),
1480 };
1481 EXPORT_SYMBOL(tgt_sec_ctx_handlers);
1482
1483 int (*tgt_lfsck_in_notify_local)(const struct lu_env *env,
1484                                  struct dt_device *key,
1485                                  struct lfsck_req_local *lrl,
1486                                  struct thandle *th) = NULL;
1487
1488 void tgt_register_lfsck_in_notify_local(int (*notify)(const struct lu_env *,
1489                                                       struct dt_device *,
1490                                                       struct lfsck_req_local *,
1491                                                       struct thandle *))
1492 {
1493         tgt_lfsck_in_notify_local = notify;
1494 }
1495 EXPORT_SYMBOL(tgt_register_lfsck_in_notify_local);
1496
1497 int (*tgt_lfsck_in_notify)(const struct lu_env *env,
1498                            struct dt_device *key,
1499                            struct lfsck_request *lr) = NULL;
1500
1501 void tgt_register_lfsck_in_notify(int (*notify)(const struct lu_env *,
1502                                                 struct dt_device *,
1503                                                 struct lfsck_request *))
1504 {
1505         tgt_lfsck_in_notify = notify;
1506 }
1507 EXPORT_SYMBOL(tgt_register_lfsck_in_notify);
1508
1509 static int (*tgt_lfsck_query)(const struct lu_env *env,
1510                               struct dt_device *key,
1511                               struct lfsck_request *req,
1512                               struct lfsck_reply *rep,
1513                               struct lfsck_query *que) = NULL;
1514
1515 void tgt_register_lfsck_query(int (*query)(const struct lu_env *,
1516                                            struct dt_device *,
1517                                            struct lfsck_request *,
1518                                            struct lfsck_reply *,
1519                                            struct lfsck_query *))
1520 {
1521         tgt_lfsck_query = query;
1522 }
1523 EXPORT_SYMBOL(tgt_register_lfsck_query);
1524
1525 /* LFSCK request handlers */
1526 static int tgt_handle_lfsck_notify(struct tgt_session_info *tsi)
1527 {
1528         const struct lu_env     *env = tsi->tsi_env;
1529         struct dt_device        *key = tsi->tsi_tgt->lut_bottom;
1530         struct lfsck_request    *lr;
1531         int                      rc;
1532         ENTRY;
1533
1534         lr = req_capsule_client_get(tsi->tsi_pill, &RMF_LFSCK_REQUEST);
1535         if (lr == NULL)
1536                 RETURN(-EPROTO);
1537
1538         rc = tgt_lfsck_in_notify(env, key, lr);
1539
1540         RETURN(rc);
1541 }
1542
1543 static int tgt_handle_lfsck_query(struct tgt_session_info *tsi)
1544 {
1545         struct lfsck_request    *request;
1546         struct lfsck_reply      *reply;
1547         int                      rc;
1548         ENTRY;
1549
1550         request = req_capsule_client_get(tsi->tsi_pill, &RMF_LFSCK_REQUEST);
1551         if (request == NULL)
1552                 RETURN(-EPROTO);
1553
1554         reply = req_capsule_server_get(tsi->tsi_pill, &RMF_LFSCK_REPLY);
1555         if (reply == NULL)
1556                 RETURN(-ENOMEM);
1557
1558         rc = tgt_lfsck_query(tsi->tsi_env, tsi->tsi_tgt->lut_bottom,
1559                              request, reply, NULL);
1560
1561         RETURN(rc < 0 ? rc : 0);
1562 }
1563
1564 struct tgt_handler tgt_lfsck_handlers[] = {
1565 TGT_LFSCK_HDL(HAS_REPLY,        LFSCK_NOTIFY,   tgt_handle_lfsck_notify),
1566 TGT_LFSCK_HDL(HAS_REPLY,        LFSCK_QUERY,    tgt_handle_lfsck_query),
1567 };
1568 EXPORT_SYMBOL(tgt_lfsck_handlers);
1569
1570 /*
1571  * initialize per-thread page pool (bug 5137).
1572  */
1573 int tgt_io_thread_init(struct ptlrpc_thread *thread)
1574 {
1575         struct tgt_thread_big_cache *tbc;
1576
1577         ENTRY;
1578
1579         LASSERT(thread != NULL);
1580         LASSERT(thread->t_data == NULL);
1581
1582         OBD_ALLOC_LARGE(tbc, sizeof(*tbc));
1583         if (tbc == NULL)
1584                 RETURN(-ENOMEM);
1585         thread->t_data = tbc;
1586         RETURN(0);
1587 }
1588 EXPORT_SYMBOL(tgt_io_thread_init);
1589
1590 /*
1591  * free per-thread pool created by tgt_thread_init().
1592  */
1593 void tgt_io_thread_done(struct ptlrpc_thread *thread)
1594 {
1595         struct tgt_thread_big_cache *tbc;
1596
1597         ENTRY;
1598
1599         LASSERT(thread != NULL);
1600
1601         /*
1602          * be prepared to handle partially-initialized pools (because this is
1603          * called from ost_io_thread_init() for cleanup.
1604          */
1605         tbc = thread->t_data;
1606         if (tbc != NULL) {
1607                 OBD_FREE_LARGE(tbc, sizeof(*tbc));
1608                 thread->t_data = NULL;
1609         }
1610         EXIT;
1611 }
1612 EXPORT_SYMBOL(tgt_io_thread_done);
1613
1614 /**
1615  * Helper function for getting Data-on-MDT file server DLM lock
1616  * if asked by client.
1617  */
1618 int tgt_mdt_data_lock(struct ldlm_namespace *ns, struct ldlm_res_id *res_id,
1619                       struct lustre_handle *lh, int mode, __u64 *flags)
1620 {
1621         union ldlm_policy_data policy = {
1622                 .l_inodebits.bits = MDS_INODELOCK_DOM,
1623         };
1624         int rc;
1625
1626         ENTRY;
1627
1628         LASSERT(lh != NULL);
1629         LASSERT(ns != NULL);
1630         LASSERT(!lustre_handle_is_used(lh));
1631
1632         rc = ldlm_cli_enqueue_local(NULL, ns, res_id, LDLM_IBITS, &policy, mode,
1633                                     flags, ldlm_blocking_ast,
1634                                     ldlm_completion_ast, ldlm_glimpse_ast,
1635                                     NULL, 0, LVB_T_NONE, NULL, lh);
1636
1637         RETURN(rc == ELDLM_OK ? 0 : -EIO);
1638 }
1639 EXPORT_SYMBOL(tgt_mdt_data_lock);
1640
1641 void tgt_mdt_data_unlock(struct lustre_handle *lh, enum ldlm_mode mode)
1642 {
1643         LASSERT(lustre_handle_is_used(lh));
1644         ldlm_lock_decref(lh, mode);
1645 }
1646 EXPORT_SYMBOL(tgt_mdt_data_unlock);
1647
1648 /**
1649  * Helper function for getting server side [start, start+count] DLM lock
1650  * if asked by client.
1651  */
1652 int tgt_extent_lock(const struct lu_env *env, struct ldlm_namespace *ns,
1653                     struct ldlm_res_id *res_id, __u64 start, __u64 end,
1654                     struct lustre_handle *lh, int mode, __u64 *flags)
1655 {
1656         union ldlm_policy_data policy;
1657         int rc;
1658
1659         ENTRY;
1660
1661         LASSERT(lh != NULL);
1662         LASSERT(ns != NULL);
1663         LASSERT(!lustre_handle_is_used(lh));
1664
1665         policy.l_extent.gid = 0;
1666         policy.l_extent.start = start & PAGE_MASK;
1667
1668         /*
1669          * If ->o_blocks is EOF it means "lock till the end of the file".
1670          * Otherwise, it's size of an extent or hole being punched (in bytes).
1671          */
1672         if (end == OBD_OBJECT_EOF || end < start)
1673                 policy.l_extent.end = OBD_OBJECT_EOF;
1674         else
1675                 policy.l_extent.end = end | ~PAGE_MASK;
1676
1677         rc = ldlm_cli_enqueue_local(env, ns, res_id, LDLM_EXTENT, &policy,
1678                                     mode, flags, ldlm_blocking_ast,
1679                                     ldlm_completion_ast, ldlm_glimpse_ast,
1680                                     NULL, 0, LVB_T_NONE, NULL, lh);
1681         RETURN(rc == ELDLM_OK ? 0 : -EIO);
1682 }
1683 EXPORT_SYMBOL(tgt_extent_lock);
1684
1685 void tgt_extent_unlock(struct lustre_handle *lh, enum ldlm_mode mode)
1686 {
1687         LASSERT(lustre_handle_is_used(lh));
1688         ldlm_lock_decref(lh, mode);
1689 }
1690 EXPORT_SYMBOL(tgt_extent_unlock);
1691
1692 static int tgt_brw_lock(const struct lu_env *env, struct obd_export *exp,
1693                         struct ldlm_res_id *res_id, struct obd_ioobj *obj,
1694                         struct niobuf_remote *nb, struct lustre_handle *lh,
1695                         enum ldlm_mode mode)
1696 {
1697         struct ldlm_namespace   *ns = exp->exp_obd->obd_namespace;
1698         __u64                    flags = 0;
1699         int                      nrbufs = obj->ioo_bufcnt;
1700         int                      i;
1701         int                      rc;
1702
1703         ENTRY;
1704
1705         LASSERT(mode == LCK_PR || mode == LCK_PW);
1706         LASSERT(!lustre_handle_is_used(lh));
1707
1708         if (ns->ns_obd->obd_recovering)
1709                 RETURN(0);
1710
1711         if (nrbufs == 0 || !(nb[0].rnb_flags & OBD_BRW_SRVLOCK))
1712                 RETURN(0);
1713
1714         for (i = 1; i < nrbufs; i++)
1715                 if (!(nb[i].rnb_flags & OBD_BRW_SRVLOCK))
1716                         RETURN(-EFAULT);
1717
1718         /* MDT IO for data-on-mdt */
1719         if (exp->exp_connect_data.ocd_connect_flags & OBD_CONNECT_IBITS)
1720                 rc = tgt_mdt_data_lock(ns, res_id, lh, mode, &flags);
1721         else
1722                 rc = tgt_extent_lock(env, ns, res_id, nb[0].rnb_offset,
1723                                      nb[nrbufs - 1].rnb_offset +
1724                                      nb[nrbufs - 1].rnb_len - 1,
1725                                      lh, mode, &flags);
1726         RETURN(rc);
1727 }
1728
1729 static void tgt_brw_unlock(struct obd_ioobj *obj, struct niobuf_remote *niob,
1730                            struct lustre_handle *lh, enum ldlm_mode mode)
1731 {
1732         ENTRY;
1733
1734         LASSERT(mode == LCK_PR || mode == LCK_PW);
1735         LASSERT((obj->ioo_bufcnt > 0 &&
1736                  (niob[0].rnb_flags & OBD_BRW_SRVLOCK)) ==
1737                 lustre_handle_is_used(lh));
1738
1739         if (lustre_handle_is_used(lh))
1740                 tgt_extent_unlock(lh, mode);
1741         EXIT;
1742 }
1743 static int tgt_checksum_niobuf(struct lu_target *tgt,
1744                                  struct niobuf_local *local_nb, int npages,
1745                                  int opc, enum cksum_types cksum_type,
1746                                  __u32 *cksum)
1747 {
1748         struct ahash_request           *req;
1749         unsigned int                    bufsize;
1750         int                             i, err;
1751         unsigned char                   cfs_alg = cksum_obd2cfs(cksum_type);
1752
1753         req = cfs_crypto_hash_init(cfs_alg, NULL, 0);
1754         if (IS_ERR(req)) {
1755                 CERROR("%s: unable to initialize checksum hash %s\n",
1756                        tgt_name(tgt), cfs_crypto_hash_name(cfs_alg));
1757                 return PTR_ERR(req);
1758         }
1759
1760         CDEBUG(D_INFO, "Checksum for algo %s\n", cfs_crypto_hash_name(cfs_alg));
1761         for (i = 0; i < npages; i++) {
1762                 /* corrupt the data before we compute the checksum, to
1763                  * simulate a client->OST data error */
1764                 if (i == 0 && opc == OST_WRITE &&
1765                     OBD_FAIL_CHECK(OBD_FAIL_OST_CHECKSUM_RECEIVE)) {
1766                         int off = local_nb[i].lnb_page_offset & ~PAGE_MASK;
1767                         int len = local_nb[i].lnb_len;
1768                         struct page *np = tgt_page_to_corrupt;
1769
1770                         if (np) {
1771                                 char *ptr = ll_kmap_atomic(local_nb[i].lnb_page,
1772                                                         KM_USER0);
1773                                 char *ptr2 = page_address(np);
1774
1775                                 memcpy(ptr2 + off, ptr + off, len);
1776                                 memcpy(ptr2 + off, "bad3", min(4, len));
1777                                 ll_kunmap_atomic(ptr, KM_USER0);
1778
1779                                 /* LU-8376 to preserve original index for
1780                                  * display in dump_all_bulk_pages() */
1781                                 np->index = i;
1782
1783                                 cfs_crypto_hash_update_page(req, np, off,
1784                                                             len);
1785                                 continue;
1786                         } else {
1787                                 CERROR("%s: can't alloc page for corruption\n",
1788                                        tgt_name(tgt));
1789                         }
1790                 }
1791                 cfs_crypto_hash_update_page(req, local_nb[i].lnb_page,
1792                                   local_nb[i].lnb_page_offset & ~PAGE_MASK,
1793                                   local_nb[i].lnb_len);
1794
1795                  /* corrupt the data after we compute the checksum, to
1796                  * simulate an OST->client data error */
1797                 if (i == 0 && opc == OST_READ &&
1798                     OBD_FAIL_CHECK(OBD_FAIL_OST_CHECKSUM_SEND)) {
1799                         int off = local_nb[i].lnb_page_offset & ~PAGE_MASK;
1800                         int len = local_nb[i].lnb_len;
1801                         struct page *np = tgt_page_to_corrupt;
1802
1803                         if (np) {
1804                                 char *ptr = ll_kmap_atomic(local_nb[i].lnb_page,
1805                                                         KM_USER0);
1806                                 char *ptr2 = page_address(np);
1807
1808                                 memcpy(ptr2 + off, ptr + off, len);
1809                                 memcpy(ptr2 + off, "bad4", min(4, len));
1810                                 ll_kunmap_atomic(ptr, KM_USER0);
1811
1812                                 /* LU-8376 to preserve original index for
1813                                  * display in dump_all_bulk_pages() */
1814                                 np->index = i;
1815
1816                                 cfs_crypto_hash_update_page(req, np, off,
1817                                                             len);
1818                                 continue;
1819                         } else {
1820                                 CERROR("%s: can't alloc page for corruption\n",
1821                                        tgt_name(tgt));
1822                         }
1823                 }
1824         }
1825
1826         bufsize = sizeof(*cksum);
1827         err = cfs_crypto_hash_final(req, (unsigned char *)cksum, &bufsize);
1828
1829         return 0;
1830 }
1831
1832 char dbgcksum_file_name[PATH_MAX];
1833
1834 static void dump_all_bulk_pages(struct obdo *oa, int count,
1835                                 struct niobuf_local *local_nb,
1836                                 __u32 server_cksum, __u32 client_cksum)
1837 {
1838         struct file *filp;
1839         int rc, i;
1840         unsigned int len;
1841         char *buf;
1842
1843         /* will only keep dump of pages on first error for the same range in
1844          * file/fid, not during the resends/retries. */
1845         snprintf(dbgcksum_file_name, sizeof(dbgcksum_file_name),
1846                  "%s-checksum_dump-ost-"DFID":[%llu-%llu]-%x-%x",
1847                  (strncmp(libcfs_debug_file_path_arr, "NONE", 4) != 0 ?
1848                   libcfs_debug_file_path_arr :
1849                   LIBCFS_DEBUG_FILE_PATH_DEFAULT),
1850                  oa->o_valid & OBD_MD_FLFID ? oa->o_parent_seq : (__u64)0,
1851                  oa->o_valid & OBD_MD_FLFID ? oa->o_parent_oid : 0,
1852                  oa->o_valid & OBD_MD_FLFID ? oa->o_parent_ver : 0,
1853                  local_nb[0].lnb_file_offset,
1854                  local_nb[count-1].lnb_file_offset +
1855                  local_nb[count-1].lnb_len - 1, client_cksum, server_cksum);
1856         filp = filp_open(dbgcksum_file_name,
1857                          O_CREAT | O_EXCL | O_WRONLY | O_LARGEFILE, 0600);
1858         if (IS_ERR(filp)) {
1859                 rc = PTR_ERR(filp);
1860                 if (rc == -EEXIST)
1861                         CDEBUG(D_INFO, "%s: can't open to dump pages with "
1862                                "checksum error: rc = %d\n", dbgcksum_file_name,
1863                                rc);
1864                 else
1865                         CERROR("%s: can't open to dump pages with checksum "
1866                                "error: rc = %d\n", dbgcksum_file_name, rc);
1867                 return;
1868         }
1869
1870         for (i = 0; i < count; i++) {
1871                 len = local_nb[i].lnb_len;
1872                 buf = kmap(local_nb[i].lnb_page);
1873                 while (len != 0) {
1874                         rc = cfs_kernel_write(filp, buf, len, &filp->f_pos);
1875                         if (rc < 0) {
1876                                 CERROR("%s: wanted to write %u but got %d "
1877                                        "error\n", dbgcksum_file_name, len, rc);
1878                                 break;
1879                         }
1880                         len -= rc;
1881                         buf += rc;
1882                         CDEBUG(D_INFO, "%s: wrote %d bytes\n",
1883                                dbgcksum_file_name, rc);
1884                 }
1885                 kunmap(local_nb[i].lnb_page);
1886         }
1887
1888         rc = vfs_fsync_range(filp, 0, LLONG_MAX, 1);
1889         if (rc)
1890                 CERROR("%s: sync returns %d\n", dbgcksum_file_name, rc);
1891         filp_close(filp, NULL);
1892         return;
1893 }
1894
1895 static int check_read_checksum(struct niobuf_local *local_nb, int npages,
1896                                struct obd_export *exp, struct obdo *oa,
1897                                const struct lnet_process_id *peer,
1898                                __u32 client_cksum, __u32 server_cksum,
1899                                enum cksum_types server_cksum_type)
1900 {
1901         char *msg;
1902         enum cksum_types cksum_type;
1903         loff_t start, end;
1904
1905         /* unlikely to happen and only if resend does not occur due to cksum
1906          * control failure on Client */
1907         if (unlikely(server_cksum == client_cksum)) {
1908                 CDEBUG(D_PAGE, "checksum %x confirmed upon retry\n",
1909                        client_cksum);
1910                 return 0;
1911         }
1912
1913         if (exp->exp_obd->obd_checksum_dump)
1914                 dump_all_bulk_pages(oa, npages, local_nb, server_cksum,
1915                                     client_cksum);
1916
1917         cksum_type = obd_cksum_type_unpack(oa->o_valid & OBD_MD_FLFLAGS ?
1918                                            oa->o_flags : 0);
1919
1920         if (cksum_type != server_cksum_type)
1921                 msg = "the server may have not used the checksum type specified"
1922                       " in the original request - likely a protocol problem";
1923         else
1924                 msg = "should have changed on the client or in transit";
1925
1926         start = local_nb[0].lnb_file_offset;
1927         end = local_nb[npages-1].lnb_file_offset +
1928                                         local_nb[npages-1].lnb_len - 1;
1929
1930         LCONSOLE_ERROR_MSG(0x132, "%s: BAD READ CHECKSUM: %s: from %s inode "
1931                 DFID " object "DOSTID" extent [%llu-%llu], client returned csum"
1932                 " %x (type %x), server csum %x (type %x)\n",
1933                 exp->exp_obd->obd_name,
1934                 msg, libcfs_nid2str(peer->nid),
1935                 oa->o_valid & OBD_MD_FLFID ? oa->o_parent_seq : 0ULL,
1936                 oa->o_valid & OBD_MD_FLFID ? oa->o_parent_oid : 0,
1937                 oa->o_valid & OBD_MD_FLFID ? oa->o_parent_ver : 0,
1938                 POSTID(&oa->o_oi),
1939                 start, end, client_cksum, cksum_type, server_cksum,
1940                 server_cksum_type);
1941
1942         return 1;
1943 }
1944
1945 static int tgt_pages2shortio(struct niobuf_local *local, int npages,
1946                              unsigned char *buf, int size)
1947 {
1948         int     i, off, len, copied = size;
1949         char    *ptr;
1950
1951         for (i = 0; i < npages; i++) {
1952                 off = local[i].lnb_page_offset & ~PAGE_MASK;
1953                 len = local[i].lnb_len;
1954
1955                 CDEBUG(D_PAGE, "index %d offset = %d len = %d left = %d\n",
1956                        i, off, len, size);
1957                 if (len > size)
1958                         return -EINVAL;
1959
1960                 ptr = ll_kmap_atomic(local[i].lnb_page, KM_USER0);
1961                 memcpy(buf + off, ptr, len);
1962                 ll_kunmap_atomic(ptr, KM_USER0);
1963                 buf += len;
1964                 size -= len;
1965         }
1966         return copied - size;
1967 }
1968
1969 static int tgt_checksum_niobuf_t10pi(struct lu_target *tgt,
1970                                      struct niobuf_local *local_nb,
1971                                      int npages, int opc,
1972                                      obd_dif_csum_fn *fn,
1973                                      int sector_size,
1974                                      u32 *check_sum)
1975 {
1976         enum cksum_types t10_cksum_type = tgt->lut_dt_conf.ddp_t10_cksum_type;
1977         unsigned char cfs_alg = cksum_obd2cfs(OBD_CKSUM_T10_TOP);
1978         const char *obd_name = tgt->lut_obd->obd_name;
1979         struct ahash_request *req;
1980         unsigned int bufsize;
1981         unsigned char *buffer;
1982         struct page *__page;
1983         __u16 *guard_start;
1984         int guard_number;
1985         int used_number = 0;
1986         __u32 cksum;
1987         int rc = 0;
1988         int used;
1989         int i;
1990
1991         __page = alloc_page(GFP_KERNEL);
1992         if (__page == NULL)
1993                 return -ENOMEM;
1994
1995         req = cfs_crypto_hash_init(cfs_alg, NULL, 0);
1996         if (IS_ERR(req)) {
1997                 CERROR("%s: unable to initialize checksum hash %s\n",
1998                        tgt_name(tgt), cfs_crypto_hash_name(cfs_alg));
1999                 return PTR_ERR(req);
2000         }
2001
2002         buffer = kmap(__page);
2003         guard_start = (__u16 *)buffer;
2004         guard_number = PAGE_SIZE / sizeof(*guard_start);
2005         for (i = 0; i < npages; i++) {
2006                 /* corrupt the data before we compute the checksum, to
2007                  * simulate a client->OST data error */
2008                 if (i == 0 && opc == OST_WRITE &&
2009                     OBD_FAIL_CHECK(OBD_FAIL_OST_CHECKSUM_RECEIVE)) {
2010                         int off = local_nb[i].lnb_page_offset & ~PAGE_MASK;
2011                         int len = local_nb[i].lnb_len;
2012                         struct page *np = tgt_page_to_corrupt;
2013
2014                         if (np) {
2015                                 char *ptr = ll_kmap_atomic(local_nb[i].lnb_page,
2016                                                         KM_USER0);
2017                                 char *ptr2 = page_address(np);
2018
2019                                 memcpy(ptr2 + off, ptr + off, len);
2020                                 memcpy(ptr2 + off, "bad3", min(4, len));
2021                                 ll_kunmap_atomic(ptr, KM_USER0);
2022
2023                                 /* LU-8376 to preserve original index for
2024                                  * display in dump_all_bulk_pages() */
2025                                 np->index = i;
2026
2027                                 cfs_crypto_hash_update_page(req, np, off,
2028                                                             len);
2029                                 continue;
2030                         } else {
2031                                 CERROR("%s: can't alloc page for corruption\n",
2032                                        tgt_name(tgt));
2033                         }
2034                 }
2035
2036                 /*
2037                  * The left guard number should be able to hold checksums of a
2038                  * whole page
2039                  */
2040                 if (t10_cksum_type && opc == OST_READ &&
2041                     local_nb[i].lnb_guard_disk) {
2042                         used = DIV_ROUND_UP(local_nb[i].lnb_len, sector_size);
2043                         if (used > (guard_number - used_number)) {
2044                                 rc = -E2BIG;
2045                                 break;
2046                         }
2047                         memcpy(guard_start + used_number,
2048                                local_nb[i].lnb_guards,
2049                                used * sizeof(*local_nb[i].lnb_guards));
2050                 } else {
2051                         rc = obd_page_dif_generate_buffer(obd_name,
2052                                 local_nb[i].lnb_page,
2053                                 local_nb[i].lnb_page_offset & ~PAGE_MASK,
2054                                 local_nb[i].lnb_len, guard_start + used_number,
2055                                 guard_number - used_number, &used, sector_size,
2056                                 fn);
2057                         if (rc)
2058                                 break;
2059                 }
2060
2061                 LASSERT(used <= MAX_GUARD_NUMBER);
2062                 /*
2063                  * If disk support T10PI checksum, copy guards to local_nb.
2064                  * If the write is partial page, do not use the guards for bio
2065                  * submission since the data might not be full-sector. The bio
2066                  * guards will be generated later based on the full sectors. If
2067                  * the sector size is 512B rather than 4 KB, or the page size
2068                  * is larger than 4KB, this might drop some useful guards for
2069                  * partial page write, but it will only add minimal extra time
2070                  * of checksum calculation.
2071                  */
2072                 if (t10_cksum_type && opc == OST_WRITE &&
2073                     local_nb[i].lnb_len == PAGE_SIZE) {
2074                         local_nb[i].lnb_guard_rpc = 1;
2075                         memcpy(local_nb[i].lnb_guards,
2076                                guard_start + used_number,
2077                                used * sizeof(*local_nb[i].lnb_guards));
2078                 }
2079
2080                 used_number += used;
2081                 if (used_number == guard_number) {
2082                         cfs_crypto_hash_update_page(req, __page, 0,
2083                                 used_number * sizeof(*guard_start));
2084                         used_number = 0;
2085                 }
2086
2087                  /* corrupt the data after we compute the checksum, to
2088                  * simulate an OST->client data error */
2089                 if (unlikely(i == 0 && opc == OST_READ &&
2090                              OBD_FAIL_CHECK(OBD_FAIL_OST_CHECKSUM_SEND))) {
2091                         int off = local_nb[i].lnb_page_offset & ~PAGE_MASK;
2092                         int len = local_nb[i].lnb_len;
2093                         struct page *np = tgt_page_to_corrupt;
2094
2095                         if (np) {
2096                                 char *ptr = ll_kmap_atomic(local_nb[i].lnb_page,
2097                                                         KM_USER0);
2098                                 char *ptr2 = page_address(np);
2099
2100                                 memcpy(ptr2 + off, ptr + off, len);
2101                                 memcpy(ptr2 + off, "bad4", min(4, len));
2102                                 ll_kunmap_atomic(ptr, KM_USER0);
2103
2104                                 /* LU-8376 to preserve original index for
2105                                  * display in dump_all_bulk_pages() */
2106                                 np->index = i;
2107
2108                                 cfs_crypto_hash_update_page(req, np, off,
2109                                                             len);
2110                                 continue;
2111                         } else {
2112                                 CERROR("%s: can't alloc page for corruption\n",
2113                                        tgt_name(tgt));
2114                         }
2115                 }
2116         }
2117         kunmap(__page);
2118         if (rc)
2119                 GOTO(out, rc);
2120
2121         if (used_number != 0)
2122                 cfs_crypto_hash_update_page(req, __page, 0,
2123                         used_number * sizeof(*guard_start));
2124
2125         bufsize = sizeof(cksum);
2126         rc = cfs_crypto_hash_final(req, (unsigned char *)&cksum, &bufsize);
2127
2128         if (rc == 0)
2129                 *check_sum = cksum;
2130 out:
2131         __free_page(__page);
2132         return rc;
2133 }
2134
2135 static int tgt_checksum_niobuf_rw(struct lu_target *tgt,
2136                                   enum cksum_types cksum_type,
2137                                   struct niobuf_local *local_nb,
2138                                   int npages, int opc, u32 *check_sum)
2139 {
2140         obd_dif_csum_fn *fn = NULL;
2141         int sector_size = 0;
2142         int rc;
2143
2144         ENTRY;
2145         obd_t10_cksum2dif(cksum_type, &fn, &sector_size);
2146
2147         if (fn)
2148                 rc = tgt_checksum_niobuf_t10pi(tgt, local_nb, npages,
2149                                                opc, fn, sector_size,
2150                                                check_sum);
2151         else
2152                 rc = tgt_checksum_niobuf(tgt, local_nb, npages, opc,
2153                                          cksum_type, check_sum);
2154         RETURN(rc);
2155 }
2156
2157 int tgt_brw_read(struct tgt_session_info *tsi)
2158 {
2159         struct ptlrpc_request   *req = tgt_ses_req(tsi);
2160         struct ptlrpc_bulk_desc *desc = NULL;
2161         struct obd_export       *exp = tsi->tsi_exp;
2162         struct niobuf_remote    *remote_nb;
2163         struct niobuf_local     *local_nb;
2164         struct obd_ioobj        *ioo;
2165         struct ost_body         *body, *repbody;
2166         struct l_wait_info       lwi;
2167         struct lustre_handle     lockh = { 0 };
2168         int                      npages, nob = 0, rc, i, no_reply = 0,
2169                                  npages_read;
2170         struct tgt_thread_big_cache *tbc = req->rq_svc_thread->t_data;
2171         const char *obd_name = exp->exp_obd->obd_name;
2172
2173         ENTRY;
2174
2175         if (ptlrpc_req2svc(req)->srv_req_portal != OST_IO_PORTAL &&
2176             ptlrpc_req2svc(req)->srv_req_portal != MDS_IO_PORTAL) {
2177                 CERROR("%s: deny read request from %s to portal %u\n",
2178                        tgt_name(tsi->tsi_tgt),
2179                        obd_export_nid2str(req->rq_export),
2180                        ptlrpc_req2svc(req)->srv_req_portal);
2181                 RETURN(-EPROTO);
2182         }
2183
2184         req->rq_bulk_read = 1;
2185
2186         if (OBD_FAIL_CHECK(OBD_FAIL_OST_BRW_READ_BULK))
2187                 RETURN(-EIO);
2188
2189         OBD_FAIL_TIMEOUT(OBD_FAIL_OST_BRW_PAUSE_BULK, cfs_fail_val > 0 ?
2190                          cfs_fail_val : (obd_timeout + 1) / 4);
2191
2192         /* Check if there is eviction in progress, and if so, wait for it to
2193          * finish */
2194         if (unlikely(atomic_read(&exp->exp_obd->obd_evict_inprogress))) {
2195                 /* We do not care how long it takes */
2196                 lwi = LWI_INTR(NULL, NULL);
2197                 rc = l_wait_event(exp->exp_obd->obd_evict_inprogress_waitq,
2198                          !atomic_read(&exp->exp_obd->obd_evict_inprogress),
2199                          &lwi);
2200         }
2201
2202         /* There must be big cache in current thread to process this request
2203          * if it is NULL then something went wrong and it wasn't allocated,
2204          * report -ENOMEM in that case */
2205         if (tbc == NULL)
2206                 RETURN(-ENOMEM);
2207
2208         body = tsi->tsi_ost_body;
2209         LASSERT(body != NULL);
2210
2211         ioo = req_capsule_client_get(tsi->tsi_pill, &RMF_OBD_IOOBJ);
2212         LASSERT(ioo != NULL); /* must exists after tgt_ost_body_unpack */
2213
2214         remote_nb = req_capsule_client_get(&req->rq_pill, &RMF_NIOBUF_REMOTE);
2215         LASSERT(remote_nb != NULL); /* must exists after tgt_ost_body_unpack */
2216
2217         local_nb = tbc->local;
2218
2219         rc = tgt_brw_lock(tsi->tsi_env, exp, &tsi->tsi_resid, ioo, remote_nb,
2220                           &lockh, LCK_PR);
2221         if (rc != 0)
2222                 RETURN(rc);
2223
2224         /*
2225          * If getting the lock took more time than
2226          * client was willing to wait, drop it. b=11330
2227          */
2228         if (ktime_get_real_seconds() > req->rq_deadline ||
2229             OBD_FAIL_CHECK(OBD_FAIL_OST_DROP_REQ)) {
2230                 no_reply = 1;
2231                 CERROR("Dropping timed-out read from %s because locking object " DOSTID " took %lld seconds (limit was %lld).\n",
2232                        libcfs_id2str(req->rq_peer), POSTID(&ioo->ioo_oid),
2233                        ktime_get_real_seconds() - req->rq_arrival_time.tv_sec,
2234                        req->rq_deadline - req->rq_arrival_time.tv_sec);
2235                 GOTO(out_lock, rc = -ETIMEDOUT);
2236         }
2237
2238         repbody = req_capsule_server_get(&req->rq_pill, &RMF_OST_BODY);
2239         repbody->oa = body->oa;
2240
2241         npages = PTLRPC_MAX_BRW_PAGES;
2242         rc = obd_preprw(tsi->tsi_env, OBD_BRW_READ, exp, &repbody->oa, 1,
2243                         ioo, remote_nb, &npages, local_nb);
2244         if (rc != 0)
2245                 GOTO(out_lock, rc);
2246
2247         if (body->oa.o_valid & OBD_MD_FLFLAGS &&
2248             body->oa.o_flags & OBD_FL_SHORT_IO) {
2249                 desc = NULL;
2250         } else {
2251                 desc = ptlrpc_prep_bulk_exp(req, npages, ioobj_max_brw_get(ioo),
2252                                             PTLRPC_BULK_PUT_SOURCE |
2253                                                 PTLRPC_BULK_BUF_KIOV,
2254                                             OST_BULK_PORTAL,
2255                                             &ptlrpc_bulk_kiov_nopin_ops);
2256                 if (desc == NULL)
2257                         GOTO(out_commitrw, rc = -ENOMEM);
2258         }
2259
2260         nob = 0;
2261         npages_read = npages;
2262         for (i = 0; i < npages; i++) {
2263                 int page_rc = local_nb[i].lnb_rc;
2264
2265                 if (page_rc < 0) {
2266                         rc = page_rc;
2267                         npages_read = i;
2268                         break;
2269                 }
2270
2271                 nob += page_rc;
2272                 if (page_rc != 0 && desc != NULL) { /* some data! */
2273                         LASSERT(local_nb[i].lnb_page != NULL);
2274                         desc->bd_frag_ops->add_kiov_frag
2275                           (desc, local_nb[i].lnb_page,
2276                            local_nb[i].lnb_page_offset & ~PAGE_MASK,
2277                            page_rc);
2278                 }
2279
2280                 if (page_rc != local_nb[i].lnb_len) { /* short read */
2281                         local_nb[i].lnb_len = page_rc;
2282                         npages_read = i + (page_rc != 0 ? 1 : 0);
2283                         /* All subsequent pages should be 0 */
2284                         while (++i < npages)
2285                                 LASSERT(local_nb[i].lnb_rc == 0);
2286                         break;
2287                 }
2288         }
2289         if (OBD_FAIL_CHECK(OBD_FAIL_OST_READ_SIZE) &&
2290             nob != cfs_fail_val)
2291                 rc = -E2BIG;
2292
2293         if (body->oa.o_valid & OBD_MD_FLCKSUM) {
2294                 u32 flag = body->oa.o_valid & OBD_MD_FLFLAGS ?
2295                            body->oa.o_flags : 0;
2296                 enum cksum_types cksum_type = obd_cksum_type_unpack(flag);
2297
2298                 repbody->oa.o_flags = obd_cksum_type_pack(obd_name,
2299                                                           cksum_type);
2300                 repbody->oa.o_valid = OBD_MD_FLCKSUM | OBD_MD_FLFLAGS;
2301
2302                 rc = tgt_checksum_niobuf_rw(tsi->tsi_tgt, cksum_type,
2303                                             local_nb, npages_read, OST_READ,
2304                                             &repbody->oa.o_cksum);
2305                 if (rc < 0)
2306                         GOTO(out_commitrw, rc);
2307                 CDEBUG(D_PAGE, "checksum at read origin: %x\n",
2308                        repbody->oa.o_cksum);
2309
2310                 /* if a resend it could be for a cksum error, so check Server
2311                  * cksum with returned Client cksum (this should even cover
2312                  * zero-cksum case) */
2313                 if ((body->oa.o_valid & OBD_MD_FLFLAGS) &&
2314                     (body->oa.o_flags & OBD_FL_RECOV_RESEND))
2315                         check_read_checksum(local_nb, npages_read, exp,
2316                                             &body->oa, &req->rq_peer,
2317                                             body->oa.o_cksum,
2318                                             repbody->oa.o_cksum, cksum_type);
2319         } else {
2320                 repbody->oa.o_valid = 0;
2321         }
2322         /* We're finishing using body->oa as an input variable */
2323
2324         /* Check if client was evicted while we were doing i/o before touching
2325          * network */
2326         if (rc == 0) {
2327                 if (body->oa.o_valid & OBD_MD_FLFLAGS &&
2328                     body->oa.o_flags & OBD_FL_SHORT_IO) {
2329                         unsigned char *short_io_buf;
2330                         int short_io_size;
2331
2332                         short_io_buf = req_capsule_server_get(&req->rq_pill,
2333                                                               &RMF_SHORT_IO);
2334                         short_io_size = req_capsule_get_size(&req->rq_pill,
2335                                                              &RMF_SHORT_IO,
2336                                                              RCL_SERVER);
2337                         rc = tgt_pages2shortio(local_nb, npages_read,
2338                                                short_io_buf, short_io_size);
2339                         if (rc >= 0)
2340                                 req_capsule_shrink(&req->rq_pill,
2341                                                    &RMF_SHORT_IO, rc,
2342                                                    RCL_SERVER);
2343                         rc = rc > 0 ? 0 : rc;
2344                 } else if (!CFS_FAIL_PRECHECK(OBD_FAIL_PTLRPC_CLIENT_BULK_CB2)) {
2345                         rc = target_bulk_io(exp, desc);
2346                 }
2347                 no_reply = rc != 0;
2348         } else {
2349                 if (body->oa.o_valid & OBD_MD_FLFLAGS &&
2350                     body->oa.o_flags & OBD_FL_SHORT_IO)
2351                         req_capsule_shrink(&req->rq_pill, &RMF_SHORT_IO, 0,
2352                                            RCL_SERVER);
2353         }
2354
2355 out_commitrw:
2356         /* Must commit after prep above in all cases */
2357         rc = obd_commitrw(tsi->tsi_env, OBD_BRW_READ, exp, &repbody->oa, 1, ioo,
2358                           remote_nb, npages, local_nb, rc);
2359 out_lock:
2360         tgt_brw_unlock(ioo, remote_nb, &lockh, LCK_PR);
2361
2362         if (desc && !CFS_FAIL_PRECHECK(OBD_FAIL_PTLRPC_CLIENT_BULK_CB2))
2363                 ptlrpc_free_bulk(desc);
2364
2365         LASSERT(rc <= 0);
2366         if (rc == 0) {
2367                 rc = nob;
2368                 ptlrpc_lprocfs_brw(req, nob);
2369         } else if (no_reply) {
2370                 req->rq_no_reply = 1;
2371                 /* reply out callback would free */
2372                 ptlrpc_req_drop_rs(req);
2373                 LCONSOLE_WARN("%s: Bulk IO read error with %s (at %s), "
2374                               "client will retry: rc %d\n",
2375                               obd_name,
2376                               obd_uuid2str(&exp->exp_client_uuid),
2377                               obd_export_nid2str(exp), rc);
2378         }
2379         /* send a bulk after reply to simulate a network delay or reordering
2380          * by a router - Note that !desc implies short io, so there is no bulk
2381          * to reorder. */
2382         if (unlikely(CFS_FAIL_PRECHECK(OBD_FAIL_PTLRPC_CLIENT_BULK_CB2)) &&
2383             desc) {
2384                 wait_queue_head_t        waitq;
2385                 struct l_wait_info       lwi1;
2386
2387                 CDEBUG(D_INFO, "reorder BULK\n");
2388                 init_waitqueue_head(&waitq);
2389
2390                 lwi1 = LWI_TIMEOUT_INTR(cfs_time_seconds(3), NULL, NULL, NULL);
2391                 l_wait_event(waitq, 0, &lwi1);
2392                 target_bulk_io(exp, desc);
2393                 ptlrpc_free_bulk(desc);
2394         }
2395
2396         RETURN(rc);
2397 }
2398 EXPORT_SYMBOL(tgt_brw_read);
2399
2400 static int tgt_shortio2pages(struct niobuf_local *local, int npages,
2401                              unsigned char *buf, unsigned int size)
2402 {
2403         int     i, off, len;
2404         char    *ptr;
2405
2406         for (i = 0; i < npages; i++) {
2407                 off = local[i].lnb_page_offset & ~PAGE_MASK;
2408                 len = local[i].lnb_len;
2409
2410                 if (len == 0)
2411                         continue;
2412
2413                 CDEBUG(D_PAGE, "index %d offset = %d len = %d left = %d\n",
2414                        i, off, len, size);
2415                 ptr = ll_kmap_atomic(local[i].lnb_page, KM_USER0);
2416                 if (ptr == NULL)
2417                         return -EINVAL;
2418                 memcpy(ptr + off, buf, len < size ? len : size);
2419                 ll_kunmap_atomic(ptr, KM_USER0);
2420                 buf += len;
2421                 size -= len;
2422         }
2423         return 0;
2424 }
2425
2426 static void tgt_warn_on_cksum(struct ptlrpc_request *req,
2427                               struct ptlrpc_bulk_desc *desc,
2428                               struct niobuf_local *local_nb, int npages,
2429                               u32 client_cksum, u32 server_cksum,
2430                               bool mmap)
2431 {
2432         struct obd_export *exp = req->rq_export;
2433         struct ost_body *body;
2434         char *router = "";
2435         char *via = "";
2436
2437         body = req_capsule_client_get(&req->rq_pill, &RMF_OST_BODY);
2438         LASSERT(body != NULL);
2439
2440         if (desc && req->rq_peer.nid != desc->bd_sender) {
2441                 via = " via ";
2442                 router = libcfs_nid2str(desc->bd_sender);
2443         }
2444
2445         if (exp->exp_obd->obd_checksum_dump)
2446                 dump_all_bulk_pages(&body->oa, npages, local_nb, server_cksum,
2447                                     client_cksum);
2448
2449         if (mmap) {
2450                 CDEBUG_LIMIT(D_INFO, "client csum %x, server csum %x\n",
2451                              client_cksum, server_cksum);
2452                 return;
2453         }
2454
2455         LCONSOLE_ERROR_MSG(0x168, "%s: BAD WRITE CHECKSUM: from %s%s%s inode "
2456                            DFID" object "DOSTID" extent [%llu-%llu"
2457                            "]: client csum %x, server csum %x\n",
2458                            exp->exp_obd->obd_name, libcfs_id2str(req->rq_peer),
2459                            via, router,
2460                            body->oa.o_valid & OBD_MD_FLFID ?
2461                            body->oa.o_parent_seq : (__u64)0,
2462                            body->oa.o_valid & OBD_MD_FLFID ?
2463                            body->oa.o_parent_oid : 0,
2464                            body->oa.o_valid & OBD_MD_FLFID ?
2465                            body->oa.o_parent_ver : 0,
2466                            POSTID(&body->oa.o_oi),
2467                            local_nb[0].lnb_file_offset,
2468                            local_nb[npages-1].lnb_file_offset +
2469                            local_nb[npages - 1].lnb_len - 1,
2470                            client_cksum, server_cksum);
2471 }
2472
2473 int tgt_brw_write(struct tgt_session_info *tsi)
2474 {
2475         struct ptlrpc_request   *req = tgt_ses_req(tsi);
2476         struct ptlrpc_bulk_desc *desc = NULL;
2477         struct obd_export       *exp = req->rq_export;
2478         struct niobuf_remote    *remote_nb;
2479         struct niobuf_local     *local_nb;
2480         struct obd_ioobj        *ioo;
2481         struct ost_body         *body, *repbody;
2482         struct lustre_handle     lockh = {0};
2483         __u32                   *rcs;
2484         int                      objcount, niocount, npages;
2485         int                      rc, i, j;
2486         enum cksum_types cksum_type = OBD_CKSUM_CRC32;
2487         bool                     no_reply = false, mmap;
2488         struct tgt_thread_big_cache *tbc = req->rq_svc_thread->t_data;
2489         bool wait_sync = false;
2490         const char *obd_name = exp->exp_obd->obd_name;
2491
2492         ENTRY;
2493
2494         if (ptlrpc_req2svc(req)->srv_req_portal != OST_IO_PORTAL &&
2495             ptlrpc_req2svc(req)->srv_req_portal != MDS_IO_PORTAL) {
2496                 CERROR("%s: deny write request from %s to portal %u\n",
2497                        tgt_name(tsi->tsi_tgt),
2498                        obd_export_nid2str(req->rq_export),
2499                        ptlrpc_req2svc(req)->srv_req_portal);
2500                 RETURN(err_serious(-EPROTO));
2501         }
2502
2503         if (OBD_FAIL_CHECK(OBD_FAIL_OST_ENOSPC))
2504                 RETURN(err_serious(-ENOSPC));
2505         if (OBD_FAIL_TIMEOUT(OBD_FAIL_OST_EROFS, 1))
2506                 RETURN(err_serious(-EROFS));
2507
2508         req->rq_bulk_write = 1;
2509
2510         if (OBD_FAIL_CHECK(OBD_FAIL_OST_BRW_WRITE_BULK))
2511                 RETURN(err_serious(-EIO));
2512         if (OBD_FAIL_CHECK(OBD_FAIL_OST_BRW_WRITE_BULK2))
2513                 RETURN(err_serious(-EFAULT));
2514
2515         /* pause before transaction has been started */
2516         CFS_FAIL_TIMEOUT(OBD_FAIL_OST_BRW_PAUSE_BULK, cfs_fail_val > 0 ?
2517                          cfs_fail_val : (obd_timeout + 1) / 4);
2518
2519         /* Delay write commit to show stale size information */
2520         CFS_FAIL_TIMEOUT(OBD_FAIL_OSC_NO_SIZE_DATA, cfs_fail_val);
2521
2522         /* There must be big cache in current thread to process this request
2523          * if it is NULL then something went wrong and it wasn't allocated,
2524          * report -ENOMEM in that case */
2525         if (tbc == NULL)
2526                 RETURN(-ENOMEM);
2527
2528         body = tsi->tsi_ost_body;
2529         LASSERT(body != NULL);
2530
2531         ioo = req_capsule_client_get(&req->rq_pill, &RMF_OBD_IOOBJ);
2532         LASSERT(ioo != NULL); /* must exists after tgt_ost_body_unpack */
2533
2534         objcount = req_capsule_get_size(&req->rq_pill, &RMF_OBD_IOOBJ,
2535                                         RCL_CLIENT) / sizeof(*ioo);
2536
2537         for (niocount = i = 0; i < objcount; i++)
2538                 niocount += ioo[i].ioo_bufcnt;
2539
2540         remote_nb = req_capsule_client_get(&req->rq_pill, &RMF_NIOBUF_REMOTE);
2541         LASSERT(remote_nb != NULL); /* must exists after tgt_ost_body_unpack */
2542         if (niocount != req_capsule_get_size(&req->rq_pill,
2543                                              &RMF_NIOBUF_REMOTE, RCL_CLIENT) /
2544                         sizeof(*remote_nb))
2545                 RETURN(err_serious(-EPROTO));
2546
2547         if ((remote_nb[0].rnb_flags & OBD_BRW_MEMALLOC) &&
2548             ptlrpc_connection_is_local(exp->exp_connection))
2549                 memory_pressure_set();
2550
2551         req_capsule_set_size(&req->rq_pill, &RMF_RCS, RCL_SERVER,
2552                              niocount * sizeof(*rcs));
2553         rc = req_capsule_server_pack(&req->rq_pill);
2554         if (rc != 0)
2555                 GOTO(out, rc = err_serious(rc));
2556
2557         CFS_FAIL_TIMEOUT(OBD_FAIL_OST_BRW_PAUSE_PACK, cfs_fail_val);
2558         rcs = req_capsule_server_get(&req->rq_pill, &RMF_RCS);
2559
2560         local_nb = tbc->local;
2561
2562         rc = tgt_brw_lock(tsi->tsi_env, exp, &tsi->tsi_resid, ioo, remote_nb,
2563                           &lockh, LCK_PW);
2564         if (rc != 0)
2565                 GOTO(out, rc);
2566
2567         /*
2568          * If getting the lock took more time than
2569          * client was willing to wait, drop it. b=11330
2570          */
2571         if (ktime_get_real_seconds() > req->rq_deadline ||
2572             OBD_FAIL_CHECK(OBD_FAIL_OST_DROP_REQ)) {
2573                 no_reply = true;
2574                 CERROR("%s: Dropping timed-out write from %s because locking object " DOSTID " took %lld seconds (limit was %lld).\n",
2575                        tgt_name(tsi->tsi_tgt), libcfs_id2str(req->rq_peer),
2576                        POSTID(&ioo->ioo_oid),
2577                        ktime_get_real_seconds() - req->rq_arrival_time.tv_sec,
2578                        req->rq_deadline - req->rq_arrival_time.tv_sec);
2579                 GOTO(out_lock, rc = -ETIMEDOUT);
2580         }
2581
2582         /* Because we already sync grant info with client when reconnect,
2583          * grant info will be cleared for resent req, then fed_grant and
2584          * total_grant will not be modified in following preprw_write */
2585         if (lustre_msg_get_flags(req->rq_reqmsg) & (MSG_RESENT | MSG_REPLAY)) {
2586                 DEBUG_REQ(D_CACHE, req, "clear resent/replay req grant info");
2587                 body->oa.o_valid &= ~OBD_MD_FLGRANT;
2588         }
2589
2590         repbody = req_capsule_server_get(&req->rq_pill, &RMF_OST_BODY);
2591         if (repbody == NULL)
2592                 GOTO(out_lock, rc = -ENOMEM);
2593         repbody->oa = body->oa;
2594
2595         npages = PTLRPC_MAX_BRW_PAGES;
2596         rc = obd_preprw(tsi->tsi_env, OBD_BRW_WRITE, exp, &repbody->oa,
2597                         objcount, ioo, remote_nb, &npages, local_nb);
2598         if (rc < 0)
2599                 GOTO(out_lock, rc);
2600         if (body->oa.o_valid & OBD_MD_FLFLAGS &&
2601             body->oa.o_flags & OBD_FL_SHORT_IO) {
2602                 unsigned int short_io_size;
2603                 unsigned char *short_io_buf;
2604
2605                 short_io_size = req_capsule_get_size(&req->rq_pill,
2606                                                      &RMF_SHORT_IO,
2607                                                      RCL_CLIENT);
2608                 short_io_buf = req_capsule_client_get(&req->rq_pill,
2609                                                       &RMF_SHORT_IO);
2610                 CDEBUG(D_INFO, "Client use short io for data transfer,"
2611                                " size = %d\n", short_io_size);
2612
2613                 /* Copy short io buf to pages */
2614                 rc = tgt_shortio2pages(local_nb, npages, short_io_buf,
2615                                        short_io_size);
2616                 desc = NULL;
2617         } else {
2618                 desc = ptlrpc_prep_bulk_exp(req, npages, ioobj_max_brw_get(ioo),
2619                                             PTLRPC_BULK_GET_SINK |
2620                                             PTLRPC_BULK_BUF_KIOV,
2621                                             OST_BULK_PORTAL,
2622                                             &ptlrpc_bulk_kiov_nopin_ops);
2623                 if (desc == NULL)
2624                         GOTO(skip_transfer, rc = -ENOMEM);
2625
2626                 /* NB Having prepped, we must commit... */
2627                 for (i = 0; i < npages; i++)
2628                         desc->bd_frag_ops->add_kiov_frag(desc,
2629                                         local_nb[i].lnb_page,
2630                                         local_nb[i].lnb_page_offset & ~PAGE_MASK,
2631                                         local_nb[i].lnb_len);
2632
2633                 rc = sptlrpc_svc_prep_bulk(req, desc);
2634                 if (rc != 0)
2635                         GOTO(skip_transfer, rc);
2636
2637                 rc = target_bulk_io(exp, desc);
2638         }
2639
2640         no_reply = rc != 0;
2641
2642 skip_transfer:
2643         if (body->oa.o_valid & OBD_MD_FLCKSUM && rc == 0) {
2644                 static int cksum_counter;
2645
2646                 if (body->oa.o_valid & OBD_MD_FLFLAGS)
2647                         cksum_type = obd_cksum_type_unpack(body->oa.o_flags);
2648
2649                 repbody->oa.o_valid |= OBD_MD_FLCKSUM | OBD_MD_FLFLAGS;
2650                 repbody->oa.o_flags &= ~OBD_FL_CKSUM_ALL;
2651                 repbody->oa.o_flags |= obd_cksum_type_pack(obd_name,
2652                                                            cksum_type);
2653
2654                 rc = tgt_checksum_niobuf_rw(tsi->tsi_tgt, cksum_type,
2655                                             local_nb, npages, OST_WRITE,
2656                                             &repbody->oa.o_cksum);
2657                 if (rc < 0)
2658                         GOTO(out_commitrw, rc);
2659
2660                 cksum_counter++;
2661
2662                 if (unlikely(body->oa.o_cksum != repbody->oa.o_cksum)) {
2663                         mmap = (body->oa.o_valid & OBD_MD_FLFLAGS &&
2664                                 body->oa.o_flags & OBD_FL_MMAP);
2665
2666                         tgt_warn_on_cksum(req, desc, local_nb, npages,
2667                                           body->oa.o_cksum,
2668                                           repbody->oa.o_cksum, mmap);
2669                         cksum_counter = 0;
2670                 } else if ((cksum_counter & (-cksum_counter)) ==
2671                            cksum_counter) {
2672                         CDEBUG(D_INFO, "Checksum %u from %s OK: %x\n",
2673                                cksum_counter, libcfs_id2str(req->rq_peer),
2674                                repbody->oa.o_cksum);
2675                 }
2676         }
2677
2678 out_commitrw:
2679         /* Must commit after prep above in all cases */
2680         rc = obd_commitrw(tsi->tsi_env, OBD_BRW_WRITE, exp, &repbody->oa,
2681                           objcount, ioo, remote_nb, npages, local_nb, rc);
2682         if (rc == -ENOTCONN)
2683                 /* quota acquire process has been given up because
2684                  * either the client has been evicted or the client
2685                  * has timed out the request already */
2686                 no_reply = true;
2687
2688         for (i = 0; i < niocount; i++) {
2689                 if (!(local_nb[i].lnb_flags & OBD_BRW_ASYNC)) {
2690                         wait_sync = true;
2691                         break;
2692                 }
2693         }
2694         /*
2695          * Disable sending mtime back to the client. If the client locked the
2696          * whole object, then it has already updated the mtime on its side,
2697          * otherwise it will have to glimpse anyway (see bug 21489, comment 32)
2698          */
2699         repbody->oa.o_valid &= ~(OBD_MD_FLMTIME | OBD_MD_FLATIME);
2700
2701         if (rc == 0) {
2702                 int nob = 0;
2703
2704                 /* set per-requested niobuf return codes */
2705                 for (i = j = 0; i < niocount; i++) {
2706                         int len = remote_nb[i].rnb_len;
2707
2708                         nob += len;
2709                         rcs[i] = 0;
2710                         do {
2711                                 LASSERT(j < npages);
2712                                 if (local_nb[j].lnb_rc < 0)
2713                                         rcs[i] = local_nb[j].lnb_rc;
2714                                 len -= local_nb[j].lnb_len;
2715                                 j++;
2716                         } while (len > 0);
2717                         LASSERT(len == 0);
2718                 }
2719                 LASSERT(j == npages);
2720                 ptlrpc_lprocfs_brw(req, nob);
2721         }
2722 out_lock:
2723         tgt_brw_unlock(ioo, remote_nb, &lockh, LCK_PW);
2724         if (desc)
2725                 ptlrpc_free_bulk(desc);
2726 out:
2727         if (unlikely(no_reply || (exp->exp_obd->obd_no_transno && wait_sync))) {
2728                 req->rq_no_reply = 1;
2729                 /* reply out callback would free */
2730                 ptlrpc_req_drop_rs(req);
2731                 if (!exp->exp_obd->obd_no_transno)
2732                         LCONSOLE_WARN("%s: Bulk IO write error with %s (at %s),"
2733                                       " client will retry: rc = %d\n",
2734                                       obd_name,
2735                                       obd_uuid2str(&exp->exp_client_uuid),
2736                                       obd_export_nid2str(exp), rc);
2737         }
2738         memory_pressure_clr();
2739         RETURN(rc);
2740 }
2741 EXPORT_SYMBOL(tgt_brw_write);
2742
2743 /* Check if request can be reconstructed from saved reply data
2744  * A copy of the reply data is returned in @trd if the pointer is not NULL
2745  */
2746 int req_can_reconstruct(struct ptlrpc_request *req,
2747                          struct tg_reply_data *trd)
2748 {
2749         struct tg_export_data *ted = &req->rq_export->exp_target_data;
2750         struct lsd_client_data *lcd = ted->ted_lcd;
2751         int found;
2752
2753         if (tgt_is_multimodrpcs_client(req->rq_export))
2754                 return tgt_lookup_reply(req, trd);
2755
2756         mutex_lock(&ted->ted_lcd_lock);
2757         found = req->rq_xid == lcd->lcd_last_xid ||
2758                 req->rq_xid == lcd->lcd_last_close_xid;
2759
2760         if (found && trd != NULL) {
2761                 if (lustre_msg_get_opc(req->rq_reqmsg) == MDS_CLOSE) {
2762                         trd->trd_reply.lrd_xid = lcd->lcd_last_close_xid;
2763                         trd->trd_reply.lrd_transno =
2764                                                 lcd->lcd_last_close_transno;
2765                         trd->trd_reply.lrd_result = lcd->lcd_last_close_result;
2766                 } else {
2767                         trd->trd_reply.lrd_xid = lcd->lcd_last_xid;
2768                         trd->trd_reply.lrd_transno = lcd->lcd_last_transno;
2769                         trd->trd_reply.lrd_result = lcd->lcd_last_result;
2770                         trd->trd_reply.lrd_data = lcd->lcd_last_data;
2771                         trd->trd_pre_versions[0] = lcd->lcd_pre_versions[0];
2772                         trd->trd_pre_versions[1] = lcd->lcd_pre_versions[1];
2773                         trd->trd_pre_versions[2] = lcd->lcd_pre_versions[2];
2774                         trd->trd_pre_versions[3] = lcd->lcd_pre_versions[3];
2775                 }
2776         }
2777         mutex_unlock(&ted->ted_lcd_lock);
2778
2779         return found;
2780 }
2781 EXPORT_SYMBOL(req_can_reconstruct);
2782