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