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) 2011, 2014, Intel Corporation.
  25  */
  26 /*
  27  * lustre/target/tgt_handler.c
  28  *
  29  * Lustre Unified Target request handler code
  30  *
  31  * Author: Brian Behlendorf <behlendorf1@llnl.gov>
  32  * Author: Mikhail Pershin <mike.pershin@intel.com>
  33  */
  34
  35 #define DEBUG_SUBSYSTEM S_CLASS
  36
  37 #include <linux/user_namespace.h>
  38 #ifdef HAVE_UIDGID_HEADER
  39 # include <linux/uidgid.h>
  40 #endif
  41
  42 #include <obd.h>
  43 #include <obd_class.h>
  44 #include <obd_cksum.h>
  45 #include <md_object.h>
  46 #include <lustre_lfsck.h>
  47 #include <lustre_nodemap.h>
  48
  49 #include "tgt_internal.h"
  50
  51 char *tgt_name(struct lu_target *tgt)
  52 {
  53         LASSERT(tgt->lut_obd != NULL);
  54         return tgt->lut_obd->obd_name;
  55 }
  56 EXPORT_SYMBOL(tgt_name);
  57
  58 /*
  59  * Generic code handling requests that have struct mdt_body passed in:
  60  *
  61  *  - extract mdt_body from request and save it in @tsi, if present;
  62  *
  63  *  - create lu_object, corresponding to the fid in mdt_body, and save it in
  64  *  @tsi;
  65  *
  66  *  - if HABEO_CORPUS flag is set for this request type check whether object
  67  *  actually exists on storage (lu_object_exists()).
  68  *
  69  */
  70 static int tgt_mdt_body_unpack(struct tgt_session_info *tsi, __u32 flags)
  71 {
  72         const struct mdt_body   *body;
  73         struct lu_object        *obj;
  74         struct req_capsule      *pill = tsi->tsi_pill;
  75         int                      rc;
  76
  77         ENTRY;
  78
  79         body = req_capsule_client_get(pill, &RMF_MDT_BODY);
  80         if (body == NULL)
  81                 RETURN(-EFAULT);
  82
  83         tsi->tsi_mdt_body = body;
  84
  85         if (!(body->mbo_valid & OBD_MD_FLID))
  86                 RETURN(0);
  87
  88         /* mdc_pack_body() doesn't check if fid is zero and set OBD_ML_FID
  89          * in any case in pre-2.5 clients. Fix that here if needed */
  90         if (unlikely(fid_is_zero(&body->mbo_fid1)))
  91                 RETURN(0);
  92
  93         if (!fid_is_sane(&body->mbo_fid1)) {
  94                 CERROR("%s: invalid FID: "DFID"\n", tgt_name(tsi->tsi_tgt),
  95                        PFID(&body->mbo_fid1));
  96                 RETURN(-EINVAL);
  97         }
  98
  99         obj = lu_object_find(tsi->tsi_env,
 100                              &tsi->tsi_tgt->lut_bottom->dd_lu_dev,
 101                              &body->mbo_fid1, NULL);
 102         if (!IS_ERR(obj)) {
 103                 if ((flags & HABEO_CORPUS) && !lu_object_exists(obj)) {
 104                         lu_object_put(tsi->tsi_env, obj);
 105                         rc = -ENOENT;
 106                 } else {
 107                         tsi->tsi_corpus = obj;
 108                         rc = 0;
 109                 }
 110         } else {
 111                 rc = PTR_ERR(obj);
 112         }
 113
 114         tsi->tsi_fid = body->mbo_fid1;
 115
 116         RETURN(rc);
 117 }
 118
 119 /**
 120  * Validate oa from client.
 121  * If the request comes from 2.0 clients, currently only RSVD seq and IDIF
 122  * req are valid.
 123  *    a. objects in Single MDT FS  seq = FID_SEQ_OST_MDT0, oi_id != 0
 124  *    b. Echo objects(seq = 2), old echo client still use oi_id/oi_seq to
 125  *       pack ost_id. Because non-zero oi_seq will make it diffcult to tell
 126  *       whether this is oi_fid or real ostid. So it will check
 127  *       OBD_CONNECT_FID, then convert the ostid to FID for old client.
 128  *    c. Old FID-disable osc will send IDIF.
 129  *    d. new FID-enable osc/osp will send normal FID.
 130  *
 131  * And also oi_id/f_oid should always start from 1. oi_id/f_oid = 0 will
 132  * be used for LAST_ID file, and only being accessed inside OST now.
 133  */
 134 int tgt_validate_obdo(struct tgt_session_info *tsi, struct obdo *oa)
 135 {
 136         struct ost_id   *oi     = &oa->o_oi;
 137         u64              seq    = ostid_seq(oi);
 138         u64              id     = ostid_id(oi);
 139         int              rc;
 140         ENTRY;
 141
 142         if (unlikely(!(exp_connect_flags(tsi->tsi_exp) & OBD_CONNECT_FID) &&
 143                      fid_seq_is_echo(seq))) {
 144                 /* Sigh 2.[123] client still sends echo req with oi_id = 0
 145                  * during create, and we will reset this to 1, since this
 146                  * oi_id is basically useless in the following create process,
 147                  * but oi_id == 0 will make it difficult to tell whether it is
 148                  * real FID or ost_id. */
 149                 oi->oi_fid.f_seq = FID_SEQ_ECHO;
 150                 oi->oi_fid.f_oid = id ?: 1;
 151                 oi->oi_fid.f_ver = 0;
 152         } else {
 153                 struct tgt_thread_info *tti = tgt_th_info(tsi->tsi_env);
 154
 155                 if (unlikely((oa->o_valid & OBD_MD_FLID) && id == 0))
 156                         GOTO(out, rc = -EPROTO);
 157
 158                 /* Note: this check might be forced in 2.5 or 2.6, i.e.
 159                  * all of the requests are required to setup FLGROUP */
 160                 if (unlikely(!(oa->o_valid & OBD_MD_FLGROUP))) {
 161                         ostid_set_seq_mdt0(oi);
 162                         oa->o_valid |= OBD_MD_FLGROUP;
 163                         seq = ostid_seq(oi);
 164                 }
 165
 166                 if (unlikely(!(fid_seq_is_idif(seq) || fid_seq_is_mdt0(seq) ||
 167                                fid_seq_is_norm(seq) || fid_seq_is_echo(seq))))
 168                         GOTO(out, rc = -EPROTO);
 169
 170                 rc = ostid_to_fid(&tti->tti_fid1, oi,
 171                                   tsi->tsi_tgt->lut_lsd.lsd_osd_index);
 172                 if (unlikely(rc != 0))
 173                         GOTO(out, rc);
 174
 175                 oi->oi_fid = tti->tti_fid1;
 176         }
 177
 178         RETURN(0);
 179
 180 out:
 181         CERROR("%s: client %s sent bad object "DOSTID": rc = %d\n",
 182                tgt_name(tsi->tsi_tgt), obd_export_nid2str(tsi->tsi_exp),
 183                seq, id, rc);
 184         return rc;
 185 }
 186 EXPORT_SYMBOL(tgt_validate_obdo);
 187
 188 static int tgt_io_data_unpack(struct tgt_session_info *tsi, struct ost_id *oi)
 189 {
 190         unsigned                 max_brw;
 191         struct niobuf_remote    *rnb;
 192         struct obd_ioobj        *ioo;
 193         int                      obj_count;
 194
 195         ENTRY;
 196
 197         ioo = req_capsule_client_get(tsi->tsi_pill, &RMF_OBD_IOOBJ);
 198         if (ioo == NULL)
 199                 RETURN(-EPROTO);
 200
 201         rnb = req_capsule_client_get(tsi->tsi_pill, &RMF_NIOBUF_REMOTE);
 202         if (rnb == NULL)
 203                 RETURN(-EPROTO);
 204
 205         max_brw = ioobj_max_brw_get(ioo);
 206         if (unlikely((max_brw & (max_brw - 1)) != 0)) {
 207                 CERROR("%s: client %s sent bad ioobj max %u for "DOSTID
 208                        ": rc = %d\n", tgt_name(tsi->tsi_tgt),
 209                        obd_export_nid2str(tsi->tsi_exp), max_brw,
 210                        POSTID(oi), -EPROTO);
 211                 RETURN(-EPROTO);
 212         }
 213         ioo->ioo_oid = *oi;
 214
 215         obj_count = req_capsule_get_size(tsi->tsi_pill, &RMF_OBD_IOOBJ,
 216                                         RCL_CLIENT) / sizeof(*ioo);
 217         if (obj_count == 0) {
 218                 CERROR("%s: short ioobj\n", tgt_name(tsi->tsi_tgt));
 219                 RETURN(-EPROTO);
 220         } else if (obj_count > 1) {
 221                 CERROR("%s: too many ioobjs (%d)\n", tgt_name(tsi->tsi_tgt),
 222                        obj_count);
 223                 RETURN(-EPROTO);
 224         }
 225
 226         if (ioo->ioo_bufcnt == 0) {
 227                 CERROR("%s: ioo has zero bufcnt\n", tgt_name(tsi->tsi_tgt));
 228                 RETURN(-EPROTO);
 229         }
 230
 231         if (ioo->ioo_bufcnt > PTLRPC_MAX_BRW_PAGES) {
 232                 DEBUG_REQ(D_RPCTRACE, tgt_ses_req(tsi),
 233                           "bulk has too many pages (%d)",
 234                           ioo->ioo_bufcnt);
 235                 RETURN(-EPROTO);
 236         }
 237
 238         RETURN(0);
 239 }
 240
 241 static int tgt_ost_body_unpack(struct tgt_session_info *tsi, __u32 flags)
 242 {
 243         struct ost_body         *body;
 244         struct req_capsule      *pill = tsi->tsi_pill;
 245         struct lu_nodemap       *nodemap;
 246         int                      rc;
 247
 248         ENTRY;
 249
 250         body = req_capsule_client_get(pill, &RMF_OST_BODY);
 251         if (body == NULL)
 252                 RETURN(-EFAULT);
 253
 254         rc = tgt_validate_obdo(tsi, &body->oa);
 255         if (rc)
 256                 RETURN(rc);
 257
 258         nodemap = tsi->tsi_exp->exp_target_data.ted_nodemap;
 259
 260         body->oa.o_uid = nodemap_map_id(nodemap, NODEMAP_UID,
 261                                         NODEMAP_CLIENT_TO_FS,
 262                                         body->oa.o_uid);
 263         body->oa.o_gid = nodemap_map_id(nodemap, NODEMAP_GID,
 264                                         NODEMAP_CLIENT_TO_FS,
 265                                         body->oa.o_gid);
 266
 267         tsi->tsi_ost_body = body;
 268         tsi->tsi_fid = body->oa.o_oi.oi_fid;
 269
 270         if (req_capsule_has_field(pill, &RMF_OBD_IOOBJ, RCL_CLIENT)) {
 271                 rc = tgt_io_data_unpack(tsi, &body->oa.o_oi);
 272                 if (rc < 0)
 273                         RETURN(rc);
 274         }
 275
 276         if (!(body->oa.o_valid & OBD_MD_FLID)) {
 277                 if (flags & HABEO_CORPUS) {
 278                         CERROR("%s: OBD_MD_FLID flag is not set in ost_body "
 279                                "but OID/FID is mandatory with HABEO_CORPUS\n",
 280                                tgt_name(tsi->tsi_tgt));
 281                         RETURN(-EPROTO);
 282                 } else {
 283                         RETURN(0);
 284                 }
 285         }
 286
 287         ost_fid_build_resid(&tsi->tsi_fid, &tsi->tsi_resid);
 288
 289         /*
 290          * OST doesn't get object in advance for further use to prevent
 291          * situations with nested object_find which is potential deadlock.
 292          */
 293         tsi->tsi_corpus = NULL;
 294         RETURN(rc);
 295 }
 296
 297 /*
 298  * Do necessary preprocessing according to handler ->th_flags.
 299  */
 300 static int tgt_request_preprocess(struct tgt_session_info *tsi,
 301                                   struct tgt_handler *h,
 302                                   struct ptlrpc_request *req)
 303 {
 304         struct req_capsule      *pill = tsi->tsi_pill;
 305         __u32                    flags = h->th_flags;
 306         int                      rc = 0;
 307
 308         ENTRY;
 309
 310         if (tsi->tsi_preprocessed)
 311                 RETURN(0);
 312
 313         LASSERT(h->th_act != NULL);
 314         LASSERT(h->th_opc == lustre_msg_get_opc(req->rq_reqmsg));
 315         LASSERT(current->journal_info == NULL);
 316
 317         LASSERT(ergo(flags & (HABEO_CORPUS | HABEO_REFERO),
 318                      h->th_fmt != NULL));
 319         if (h->th_fmt != NULL) {
 320                 req_capsule_set(pill, h->th_fmt);
 321                 if (req_capsule_has_field(pill, &RMF_MDT_BODY, RCL_CLIENT)) {
 322                         rc = tgt_mdt_body_unpack(tsi, flags);
 323                         if (rc < 0)
 324                                 RETURN(rc);
 325                 } else if (req_capsule_has_field(pill, &RMF_OST_BODY,
 326                                                  RCL_CLIENT)) {
 327                         rc = tgt_ost_body_unpack(tsi, flags);
 328                         if (rc < 0)
 329                                 RETURN(rc);
 330                 }
 331         }
 332
 333         if (flags & MUTABOR && tgt_conn_flags(tsi) & OBD_CONNECT_RDONLY)
 334                 RETURN(-EROFS);
 335
 336         if (flags & HABEO_CLAVIS) {
 337                 struct ldlm_request *dlm_req;
 338
 339                 LASSERT(h->th_fmt != NULL);
 340
 341                 dlm_req = req_capsule_client_get(pill, &RMF_DLM_REQ);
 342                 if (dlm_req != NULL) {
 343                         if (unlikely(dlm_req->lock_desc.l_resource.lr_type ==
 344                                      LDLM_IBITS &&
 345                                      dlm_req->lock_desc.l_policy_data.\
 346                                      l_inodebits.bits == 0)) {
 347                                 /*
 348                                  * Lock without inodebits makes no sense and
 349                                  * will oops later in ldlm. If client miss to
 350                                  * set such bits, do not trigger ASSERTION.
 351                                  *
 352                                  * For liblustre flock case, it maybe zero.
 353                                  */
 354                                 rc = -EPROTO;
 355                         } else {
 356                                 tsi->tsi_dlm_req = dlm_req;
 357                         }
 358                 } else {
 359                         rc = -EFAULT;
 360                 }
 361         }
 362         tsi->tsi_preprocessed = 1;
 363         RETURN(rc);
 364 }
 365
 366 /*
 367  * Invoke handler for this request opc. Also do necessary preprocessing
 368  * (according to handler ->th_flags), and post-processing (setting of
 369  * ->last_{xid,committed}).
 370  */
 371 static int tgt_handle_request0(struct tgt_session_info *tsi,
 372                                struct tgt_handler *h,
 373                                struct ptlrpc_request *req)
 374 {
 375         int      serious = 0;
 376         int      rc;
 377
 378         ENTRY;
 379
 380         /*
 381          * Checking for various OBD_FAIL_$PREF_$OPC_NET codes. _Do_ not try
 382          * to put same checks into handlers like mdt_close(), mdt_reint(),
 383          * etc., without talking to mdt authors first. Checking same thing
 384          * there again is useless and returning 0 error without packing reply
 385          * is buggy! Handlers either pack reply or return error.
 386          *
 387          * We return 0 here and do not send any reply in order to emulate
 388          * network failure. Do not send any reply in case any of NET related
 389          * fail_id has occured.
 390          */
 391         if (OBD_FAIL_CHECK_ORSET(h->th_fail_id, OBD_FAIL_ONCE))
 392                 RETURN(0);
 393
 394         rc = tgt_request_preprocess(tsi, h, req);
 395         /* pack reply if reply format is fixed */
 396         if (rc == 0 && h->th_flags & HABEO_REFERO) {
 397                 /* Pack reply */
 398                 if (req_capsule_has_field(tsi->tsi_pill, &RMF_MDT_MD,
 399                                           RCL_SERVER))
 400                         req_capsule_set_size(tsi->tsi_pill, &RMF_MDT_MD,
 401                                              RCL_SERVER,
 402                                              tsi->tsi_mdt_body->mbo_eadatasize);
 403                 if (req_capsule_has_field(tsi->tsi_pill, &RMF_LOGCOOKIES,
 404                                           RCL_SERVER))
 405                         req_capsule_set_size(tsi->tsi_pill, &RMF_LOGCOOKIES,
 406                                              RCL_SERVER, 0);
 407
 408                 rc = req_capsule_server_pack(tsi->tsi_pill);
 409         }
 410
 411         if (likely(rc == 0)) {
 412                 /*
 413                  * Process request, there can be two types of rc:
 414                  * 1) errors with msg unpack/pack, other failures outside the
 415                  * operation itself. This is counted as serious errors;
 416                  * 2) errors during fs operation, should be placed in rq_status
 417                  * only
 418                  */
 419                 rc = h->th_act(tsi);
 420                 if (!is_serious(rc) &&
 421                     !req->rq_no_reply && req->rq_reply_state == NULL) {
 422                         DEBUG_REQ(D_ERROR, req, "%s \"handler\" %s did not "
 423                                   "pack reply and returned 0 error\n",
 424                                   tgt_name(tsi->tsi_tgt), h->th_name);
 425                         LBUG();
 426                 }
 427                 serious = is_serious(rc);
 428                 rc = clear_serious(rc);
 429         } else {
 430                 serious = 1;
 431         }
 432
 433         req->rq_status = rc;
 434
 435         /*
 436          * ELDLM_* codes which > 0 should be in rq_status only as well as
 437          * all non-serious errors.
 438          */
 439         if (rc > 0 || !serious)
 440                 rc = 0;
 441
 442         LASSERT(current->journal_info == NULL);
 443
 444         if (likely(rc == 0 && req->rq_export))
 445                 target_committed_to_req(req);
 446
 447         target_send_reply(req, rc, tsi->tsi_reply_fail_id);
 448         RETURN(0);
 449 }
 450
 451 static int tgt_filter_recovery_request(struct ptlrpc_request *req,
 452                                        struct obd_device *obd, int *process)
 453 {
 454         switch (lustre_msg_get_opc(req->rq_reqmsg)) {
 455         case MDS_DISCONNECT:
 456         case OST_DISCONNECT:
 457         case OBD_IDX_READ:
 458                 *process = 1;
 459                 RETURN(0);
 460         case MDS_CLOSE:
 461         case MDS_DONE_WRITING:
 462         case MDS_SYNC: /* used in unmounting */
 463         case OBD_PING:
 464         case MDS_REINT:
 465         case OUT_UPDATE:
 466         case SEQ_QUERY:
 467         case FLD_QUERY:
 468         case FLD_READ:
 469         case LDLM_ENQUEUE:
 470         case OST_CREATE:
 471         case OST_DESTROY:
 472         case OST_PUNCH:
 473         case OST_SETATTR:
 474         case OST_SYNC:
 475         case OST_WRITE:
 476                 *process = target_queue_recovery_request(req, obd);
 477                 RETURN(0);
 478
 479         default:
 480                 DEBUG_REQ(D_ERROR, req, "not permitted during recovery");
 481                 *process = -EAGAIN;
 482                 RETURN(0);
 483         }
 484 }
 485
 486 /*
 487  * Handle recovery. Return:
 488  *        +1: continue request processing;
 489  *       -ve: abort immediately with the given error code;
 490  *         0: send reply with error code in req->rq_status;
 491  */
 492 static int tgt_handle_recovery(struct ptlrpc_request *req, int reply_fail_id)
 493 {
 494         ENTRY;
 495
 496         switch (lustre_msg_get_opc(req->rq_reqmsg)) {
 497         case MDS_CONNECT:
 498         case OST_CONNECT:
 499         case MGS_CONNECT:
 500         case SEC_CTX_INIT:
 501         case SEC_CTX_INIT_CONT:
 502         case SEC_CTX_FINI:
 503                 RETURN(+1);
 504         }
 505
 506         if (!req->rq_export->exp_obd->obd_replayable)
 507                 RETURN(+1);
 508
 509         /* sanity check: if the xid matches, the request must be marked as a
 510          * resent or replayed */
 511         if (req_xid_is_last(req)) {
 512                 if (!(lustre_msg_get_flags(req->rq_reqmsg) &
 513                       (MSG_RESENT | MSG_REPLAY))) {
 514                         DEBUG_REQ(D_WARNING, req, "rq_xid "LPU64" matches "
 515                                   "last_xid, expected REPLAY or RESENT flag "
 516                                   "(%x)", req->rq_xid,
 517                                   lustre_msg_get_flags(req->rq_reqmsg));
 518                         req->rq_status = -ENOTCONN;
 519                         RETURN(-ENOTCONN);
 520                 }
 521         }
 522         /* else: note the opposite is not always true; a RESENT req after a
 523          * failover will usually not match the last_xid, since it was likely
 524          * never committed. A REPLAYed request will almost never match the
 525          * last xid, however it could for a committed, but still retained,
 526          * open. */
 527
 528         /* Check for aborted recovery... */
 529         if (unlikely(req->rq_export->exp_obd->obd_recovering)) {
 530                 int rc;
 531                 int should_process;
 532
 533                 DEBUG_REQ(D_INFO, req, "Got new replay");
 534                 rc = tgt_filter_recovery_request(req, req->rq_export->exp_obd,
 535                                                  &should_process);
 536                 if (rc != 0 || !should_process)
 537                         RETURN(rc);
 538                 else if (should_process < 0) {
 539                         req->rq_status = should_process;
 540                         rc = ptlrpc_error(req);
 541                         RETURN(rc);
 542                 }
 543         }
 544         RETURN(+1);
 545 }
 546
 547 /* Initial check for request, it is validation mostly */
 548 static struct tgt_handler *tgt_handler_find_check(struct ptlrpc_request *req)
 549 {
 550         struct tgt_handler      *h;
 551         struct tgt_opc_slice    *s;
 552         struct lu_target        *tgt;
 553         __u32                    opc = lustre_msg_get_opc(req->rq_reqmsg);
 554
 555         ENTRY;
 556
 557         tgt = class_exp2tgt(req->rq_export);
 558
 559         for (s = tgt->lut_slice; s->tos_hs != NULL; s++)
 560                 if (s->tos_opc_start <= opc && opc < s->tos_opc_end)
 561                         break;
 562
 563         /* opcode was not found in slice */
 564         if (unlikely(s->tos_hs == NULL)) {
 565                 CERROR("%s: no handlers for opcode 0x%x\n", tgt_name(tgt),
 566                        opc);
 567                 RETURN(ERR_PTR(-ENOTSUPP));
 568         }
 569
 570         LASSERT(opc >= s->tos_opc_start && opc < s->tos_opc_end);
 571         h = s->tos_hs + (opc - s->tos_opc_start);
 572         if (unlikely(h->th_opc == 0)) {
 573                 CERROR("%s: unsupported opcode 0x%x\n", tgt_name(tgt), opc);
 574                 RETURN(ERR_PTR(-ENOTSUPP));
 575         }
 576
 577         RETURN(h);
 578 }
 579
 580 int tgt_request_handle(struct ptlrpc_request *req)
 581 {
 582         struct tgt_session_info *tsi = tgt_ses_info(req->rq_svc_thread->t_env);
 583
 584         struct lustre_msg       *msg = req->rq_reqmsg;
 585         struct tgt_handler      *h;
 586         struct lu_target        *tgt;
 587         int                      request_fail_id = 0;
 588         __u32                    opc = lustre_msg_get_opc(msg);
 589         int                      rc;
 590
 591         ENTRY;
 592
 593         /* Refill the context, to make sure all thread keys are allocated */
 594         lu_env_refill(req->rq_svc_thread->t_env);
 595
 596         req_capsule_init(&req->rq_pill, req, RCL_SERVER);
 597         tsi->tsi_pill = &req->rq_pill;
 598         tsi->tsi_env = req->rq_svc_thread->t_env;
 599
 600         /* if request has export then get handlers slice from corresponding
 601          * target, otherwise that should be connect operation */
 602         if (opc == MDS_CONNECT || opc == OST_CONNECT ||
 603             opc == MGS_CONNECT) {
 604                 req_capsule_set(&req->rq_pill, &RQF_CONNECT);
 605                 rc = target_handle_connect(req);
 606                 if (rc != 0) {
 607                         rc = ptlrpc_error(req);
 608                         GOTO(out, rc);
 609                 }
 610                 /* recovery-small test 18c asks to drop connect reply */
 611                 if (unlikely(opc == OST_CONNECT &&
 612                              OBD_FAIL_CHECK(OBD_FAIL_OST_CONNECT_NET2)))
 613                         GOTO(out, rc = 0);
 614         }
 615
 616         if (unlikely(!class_connected_export(req->rq_export))) {
 617                 CDEBUG(D_HA, "operation %d on unconnected OST from %s\n",
 618                        opc, libcfs_id2str(req->rq_peer));
 619                 req->rq_status = -ENOTCONN;
 620                 rc = ptlrpc_error(req);
 621                 GOTO(out, rc);
 622         }
 623
 624         tsi->tsi_tgt = tgt = class_exp2tgt(req->rq_export);
 625         tsi->tsi_exp = req->rq_export;
 626         if (exp_connect_flags(req->rq_export) & OBD_CONNECT_JOBSTATS)
 627                 tsi->tsi_jobid = lustre_msg_get_jobid(req->rq_reqmsg);
 628         else
 629                 tsi->tsi_jobid = NULL;
 630
 631         request_fail_id = tgt->lut_request_fail_id;
 632         tsi->tsi_reply_fail_id = tgt->lut_reply_fail_id;
 633
 634         h = tgt_handler_find_check(req);
 635         if (IS_ERR(h)) {
 636                 req->rq_status = PTR_ERR(h);
 637                 rc = ptlrpc_error(req);
 638                 GOTO(out, rc);
 639         }
 640
 641         if (CFS_FAIL_CHECK_ORSET(request_fail_id, CFS_FAIL_ONCE))
 642                 GOTO(out, rc = 0);
 643
 644         rc = lustre_msg_check_version(msg, h->th_version);
 645         if (unlikely(rc)) {
 646                 DEBUG_REQ(D_ERROR, req, "%s: drop mal-formed request, version"
 647                           " %08x, expecting %08x\n", tgt_name(tgt),
 648                           lustre_msg_get_version(msg), h->th_version);
 649                 req->rq_status = -EINVAL;
 650                 rc = ptlrpc_error(req);
 651                 GOTO(out, rc);
 652         }
 653
 654         rc = tgt_handle_recovery(req, tsi->tsi_reply_fail_id);
 655         if (likely(rc == 1)) {
 656                 LASSERTF(h->th_opc == opc, "opcode mismatch %d != %d\n",
 657                          h->th_opc, opc);
 658                 rc = tgt_handle_request0(tsi, h, req);
 659                 if (rc)
 660                         GOTO(out, rc);
 661         }
 662         EXIT;
 663 out:
 664         req_capsule_fini(tsi->tsi_pill);
 665         if (tsi->tsi_corpus != NULL) {
 666                 lu_object_put(tsi->tsi_env, tsi->tsi_corpus);
 667                 tsi->tsi_corpus = NULL;
 668         }
 669         return rc;
 670 }
 671 EXPORT_SYMBOL(tgt_request_handle);
 672
 673 /** Assign high priority operations to the request if needed. */
 674 int tgt_hpreq_handler(struct ptlrpc_request *req)
 675 {
 676         struct tgt_session_info *tsi = tgt_ses_info(req->rq_svc_thread->t_env);
 677         struct tgt_handler      *h;
 678         int                      rc;
 679
 680         ENTRY;
 681
 682         if (req->rq_export == NULL)
 683                 RETURN(0);
 684
 685         req_capsule_init(&req->rq_pill, req, RCL_SERVER);
 686         tsi->tsi_pill = &req->rq_pill;
 687         tsi->tsi_env = req->rq_svc_thread->t_env;
 688         tsi->tsi_tgt = class_exp2tgt(req->rq_export);
 689         tsi->tsi_exp = req->rq_export;
 690
 691         h = tgt_handler_find_check(req);
 692         if (IS_ERR(h)) {
 693                 rc = PTR_ERR(h);
 694                 RETURN(rc);
 695         }
 696
 697         rc = tgt_request_preprocess(tsi, h, req);
 698         if (unlikely(rc != 0))
 699                 RETURN(rc);
 700
 701         if (h->th_hp != NULL)
 702                 h->th_hp(tsi);
 703         RETURN(0);
 704 }
 705 EXPORT_SYMBOL(tgt_hpreq_handler);
 706
 707 void tgt_counter_incr(struct obd_export *exp, int opcode)
 708 {
 709         lprocfs_counter_incr(exp->exp_obd->obd_stats, opcode);
 710         if (exp->exp_nid_stats && exp->exp_nid_stats->nid_stats != NULL)
 711                 lprocfs_counter_incr(exp->exp_nid_stats->nid_stats, opcode);
 712 }
 713 EXPORT_SYMBOL(tgt_counter_incr);
 714
 715 /*
 716  * Unified target generic handlers.
 717  */
 718
 719 /*
 720  * Security functions
 721  */
 722 static inline void tgt_init_sec_none(struct obd_connect_data *reply)
 723 {
 724         reply->ocd_connect_flags &= ~(OBD_CONNECT_RMT_CLIENT |
 725                                       OBD_CONNECT_RMT_CLIENT_FORCE);
 726 }
 727
 728 static int tgt_init_sec_level(struct ptlrpc_request *req)
 729 {
 730         struct lu_target        *tgt = class_exp2tgt(req->rq_export);
 731         char                    *client;
 732         struct obd_connect_data *data, *reply;
 733         int                      rc = 0;
 734         bool                     remote;
 735         ENTRY;
 736
 737         data = req_capsule_client_get(&req->rq_pill, &RMF_CONNECT_DATA);
 738         reply = req_capsule_server_get(&req->rq_pill, &RMF_CONNECT_DATA);
 739         if (data == NULL || reply == NULL)
 740                 RETURN(-EFAULT);
 741
 742         /* connection from MDT is always trusted */
 743         if (req->rq_auth_usr_mdt) {
 744                 tgt_init_sec_none(reply);
 745                 RETURN(0);
 746         }
 747
 748         client = libcfs_nid2str(req->rq_peer.nid);
 749         /* no GSS support case */
 750         if (!req->rq_auth_gss) {
 751                 if (tgt->lut_sec_level > LUSTRE_SEC_NONE) {
 752                         CWARN("client %s -> target %s does not use GSS, "
 753                               "can not run under security level %d.\n",
 754                               client, tgt_name(tgt), tgt->lut_sec_level);
 755                         RETURN(-EACCES);
 756                 } else {
 757                         tgt_init_sec_none(reply);
 758                         RETURN(0);
 759                 }
 760         }
 761
 762         /* old version case */
 763         if (unlikely(!(data->ocd_connect_flags & OBD_CONNECT_RMT_CLIENT) ||
 764                      !(data->ocd_connect_flags & OBD_CONNECT_MDS_CAPA) ||
 765                      !(data->ocd_connect_flags & OBD_CONNECT_OSS_CAPA))) {
 766                 if (tgt->lut_sec_level > LUSTRE_SEC_NONE) {
 767                         CWARN("client %s -> target %s uses old version, "
 768                               "can not run under security level %d.\n",
 769                               client, tgt_name(tgt), tgt->lut_sec_level);
 770                         RETURN(-EACCES);
 771                 } else {
 772                         CWARN("client %s -> target %s uses old version, "
 773                               "run under security level %d.\n",
 774                               client, tgt_name(tgt), tgt->lut_sec_level);
 775                         tgt_init_sec_none(reply);
 776                         RETURN(0);
 777                 }
 778         }
 779
 780         remote = data->ocd_connect_flags & OBD_CONNECT_RMT_CLIENT_FORCE;
 781         if (remote) {
 782                 if (!req->rq_auth_remote)
 783                         CDEBUG(D_SEC, "client (local realm) %s -> target %s "
 784                                "asked to be remote.\n", client, tgt_name(tgt));
 785         } else if (req->rq_auth_remote) {
 786                 remote = true;
 787                 CDEBUG(D_SEC, "client (remote realm) %s -> target %s is set "
 788                        "as remote by default.\n", client, tgt_name(tgt));
 789         }
 790
 791         if (remote == 0) {
 792                 if (!uid_valid(make_kuid(&init_user_ns, req->rq_auth_uid))) {
 793                         CDEBUG(D_SEC, "client %s -> target %s: user is not "
 794                                "authenticated!\n", client, tgt_name(tgt));
 795                         RETURN(-EACCES);
 796                 }
 797         }
 798
 799
 800         switch (tgt->lut_sec_level) {
 801         case LUSTRE_SEC_NONE:
 802                 if (remote) {
 803                         CDEBUG(D_SEC,
 804                                "client %s -> target %s is set as remote, "
 805                                "can not run under security level %d.\n",
 806                                client, tgt_name(tgt), tgt->lut_sec_level);
 807                         RETURN(-EACCES);
 808                 }
 809                 tgt_init_sec_none(reply);
 810                 break;
 811         case LUSTRE_SEC_REMOTE:
 812                 if (!remote)
 813                         tgt_init_sec_none(reply);
 814                 break;
 815         case LUSTRE_SEC_ALL:
 816                 if (remote)
 817                         break;
 818                 reply->ocd_connect_flags &= ~(OBD_CONNECT_RMT_CLIENT |
 819                                               OBD_CONNECT_RMT_CLIENT_FORCE);
 820                 reply->ocd_connect_flags &= ~OBD_CONNECT_OSS_CAPA;
 821                 reply->ocd_connect_flags &= ~OBD_CONNECT_MDS_CAPA;
 822                 break;
 823         default:
 824                 RETURN(-EINVAL);
 825         }
 826
 827         RETURN(rc);
 828 }
 829
 830 int tgt_connect_check_sptlrpc(struct ptlrpc_request *req, struct obd_export *exp)
 831 {
 832         struct lu_target        *tgt = class_exp2tgt(exp);
 833         struct sptlrpc_flavor    flvr;
 834         int                      rc = 0;
 835
 836         LASSERT(tgt);
 837         LASSERT(tgt->lut_obd);
 838         LASSERT(tgt->lut_slice);
 839
 840         /* always allow ECHO client */
 841         if (unlikely(strcmp(exp->exp_obd->obd_type->typ_name,
 842                             LUSTRE_ECHO_NAME) == 0)) {
 843                 exp->exp_flvr.sf_rpc = SPTLRPC_FLVR_ANY;
 844                 return 0;
 845         }
 846
 847         if (exp->exp_flvr.sf_rpc == SPTLRPC_FLVR_INVALID) {
 848                 read_lock(&tgt->lut_sptlrpc_lock);
 849                 sptlrpc_target_choose_flavor(&tgt->lut_sptlrpc_rset,
 850                                              req->rq_sp_from,
 851                                              req->rq_peer.nid,
 852                                              &flvr);
 853                 read_unlock(&tgt->lut_sptlrpc_lock);
 854
 855                 spin_lock(&exp->exp_lock);
 856                 exp->exp_sp_peer = req->rq_sp_from;
 857                 exp->exp_flvr = flvr;
 858                 if (exp->exp_flvr.sf_rpc != SPTLRPC_FLVR_ANY &&
 859                     exp->exp_flvr.sf_rpc != req->rq_flvr.sf_rpc) {
 860                         CERROR("%s: unauthorized rpc flavor %x from %s, "
 861                                "expect %x\n", tgt_name(tgt),
 862                                req->rq_flvr.sf_rpc,
 863                                libcfs_nid2str(req->rq_peer.nid),
 864                                exp->exp_flvr.sf_rpc);
 865                         rc = -EACCES;
 866                 }
 867                 spin_unlock(&exp->exp_lock);
 868         } else {
 869                 if (exp->exp_sp_peer != req->rq_sp_from) {
 870                         CERROR("%s: RPC source %s doesn't match %s\n",
 871                                tgt_name(tgt),
 872                                sptlrpc_part2name(req->rq_sp_from),
 873                                sptlrpc_part2name(exp->exp_sp_peer));
 874                         rc = -EACCES;
 875                 } else {
 876                         rc = sptlrpc_target_export_check(exp, req);
 877                 }
 878         }
 879
 880         return rc;
 881 }
 882
 883 int tgt_adapt_sptlrpc_conf(struct lu_target *tgt, int initial)
 884 {
 885         struct sptlrpc_rule_set  tmp_rset;
 886         int                      rc;
 887
 888         sptlrpc_rule_set_init(&tmp_rset);
 889         rc = sptlrpc_conf_target_get_rules(tgt->lut_obd, &tmp_rset, initial);
 890         if (rc) {
 891                 CERROR("%s: failed get sptlrpc rules: rc = %d\n",
 892                        tgt_name(tgt), rc);
 893                 return rc;
 894         }
 895
 896         sptlrpc_target_update_exp_flavor(tgt->lut_obd, &tmp_rset);
 897
 898         write_lock(&tgt->lut_sptlrpc_lock);
 899         sptlrpc_rule_set_free(&tgt->lut_sptlrpc_rset);
 900         tgt->lut_sptlrpc_rset = tmp_rset;
 901         write_unlock(&tgt->lut_sptlrpc_lock);
 902
 903         return 0;
 904 }
 905 EXPORT_SYMBOL(tgt_adapt_sptlrpc_conf);
 906
 907 int tgt_connect(struct tgt_session_info *tsi)
 908 {
 909         struct ptlrpc_request   *req = tgt_ses_req(tsi);
 910         struct obd_connect_data *reply;
 911         int                      rc;
 912
 913         ENTRY;
 914
 915         rc = tgt_init_sec_level(req);
 916         if (rc != 0)
 917                 GOTO(out, rc);
 918
 919         /* XXX: better to call this check right after getting new export but
 920          * before last_rcvd slot allocation to avoid server load upon insecure
 921          * connects. This is to be fixed after unifiyng all targets.
 922          */
 923         rc = tgt_connect_check_sptlrpc(req, tsi->tsi_exp);
 924         if (rc)
 925                 GOTO(out, rc);
 926
 927         /* To avoid exposing partially initialized connection flags, changes up
 928          * to this point have been staged in reply->ocd_connect_flags. Now that
 929          * connection handling has completed successfully, atomically update
 930          * the connect flags in the shared export data structure. LU-1623 */
 931         reply = req_capsule_server_get(tsi->tsi_pill, &RMF_CONNECT_DATA);
 932         spin_lock(&tsi->tsi_exp->exp_lock);
 933         *exp_connect_flags_ptr(tsi->tsi_exp) = reply->ocd_connect_flags;
 934         tsi->tsi_exp->exp_connect_data.ocd_brw_size = reply->ocd_brw_size;
 935         spin_unlock(&tsi->tsi_exp->exp_lock);
 936
 937         RETURN(0);
 938 out:
 939         obd_disconnect(class_export_get(tsi->tsi_exp));
 940         return rc;
 941 }
 942 EXPORT_SYMBOL(tgt_connect);
 943
 944 int tgt_disconnect(struct tgt_session_info *tsi)
 945 {
 946         int rc;
 947
 948         ENTRY;
 949
 950         rc = target_handle_disconnect(tgt_ses_req(tsi));
 951         if (rc)
 952                 RETURN(err_serious(rc));
 953
 954         RETURN(rc);
 955 }
 956 EXPORT_SYMBOL(tgt_disconnect);
 957
 958 /*
 959  * Unified target OBD handlers
 960  */
 961 int tgt_obd_ping(struct tgt_session_info *tsi)
 962 {
 963         int rc;
 964
 965         ENTRY;
 966
 967         rc = target_handle_ping(tgt_ses_req(tsi));
 968         if (rc)
 969                 RETURN(err_serious(rc));
 970
 971         RETURN(rc);
 972 }
 973 EXPORT_SYMBOL(tgt_obd_ping);
 974
 975 int tgt_obd_log_cancel(struct tgt_session_info *tsi)
 976 {
 977         return err_serious(-EOPNOTSUPP);
 978 }
 979
 980 int tgt_obd_qc_callback(struct tgt_session_info *tsi)
 981 {
 982         return err_serious(-EOPNOTSUPP);
 983 }
 984
 985 int tgt_sendpage(struct tgt_session_info *tsi, struct lu_rdpg *rdpg, int nob)
 986 {
 987         struct tgt_thread_info  *tti = tgt_th_info(tsi->tsi_env);
 988         struct ptlrpc_request   *req = tgt_ses_req(tsi);
 989         struct obd_export       *exp = req->rq_export;
 990         struct ptlrpc_bulk_desc *desc;
 991         struct l_wait_info      *lwi = &tti->tti_u.rdpg.tti_wait_info;
 992         int                      tmpcount;
 993         int                      tmpsize;
 994         int                      i;
 995         int                      rc;
 996
 997         ENTRY;
 998
 999         desc = ptlrpc_prep_bulk_exp(req, rdpg->rp_npages, 1, BULK_PUT_SOURCE,
1000                                     MDS_BULK_PORTAL);
1001         if (desc == NULL)
1002                 RETURN(-ENOMEM);
1003
1004         if (!(exp_connect_flags(exp) & OBD_CONNECT_BRW_SIZE))
1005                 /* old client requires reply size in it's PAGE_CACHE_SIZE,
1006                  * which is rdpg->rp_count */
1007                 nob = rdpg->rp_count;
1008
1009         for (i = 0, tmpcount = nob; i < rdpg->rp_npages && tmpcount > 0;
1010              i++, tmpcount -= tmpsize) {
1011                 tmpsize = min_t(int, tmpcount, PAGE_CACHE_SIZE);
1012                 ptlrpc_prep_bulk_page_pin(desc, rdpg->rp_pages[i], 0, tmpsize);
1013         }
1014
1015         LASSERT(desc->bd_nob == nob);
1016         rc = target_bulk_io(exp, desc, lwi);
1017         ptlrpc_free_bulk_pin(desc);
1018         RETURN(rc);
1019 }
1020 EXPORT_SYMBOL(tgt_sendpage);
1021
1022 /*
1023  * OBD_IDX_READ handler
1024  */
1025 static int tgt_obd_idx_read(struct tgt_session_info *tsi)
1026 {
1027         struct tgt_thread_info  *tti = tgt_th_info(tsi->tsi_env);
1028         struct lu_rdpg          *rdpg = &tti->tti_u.rdpg.tti_rdpg;
1029         struct idx_info         *req_ii, *rep_ii;
1030         int                      rc, i;
1031
1032         ENTRY;
1033
1034         memset(rdpg, 0, sizeof(*rdpg));
1035         req_capsule_set(tsi->tsi_pill, &RQF_OBD_IDX_READ);
1036
1037         /* extract idx_info buffer from request & reply */
1038         req_ii = req_capsule_client_get(tsi->tsi_pill, &RMF_IDX_INFO);
1039         if (req_ii == NULL || req_ii->ii_magic != IDX_INFO_MAGIC)
1040                 RETURN(err_serious(-EPROTO));
1041
1042         rc = req_capsule_server_pack(tsi->tsi_pill);
1043         if (rc)
1044                 RETURN(err_serious(rc));
1045
1046         rep_ii = req_capsule_server_get(tsi->tsi_pill, &RMF_IDX_INFO);
1047         if (rep_ii == NULL)
1048                 RETURN(err_serious(-EFAULT));
1049         rep_ii->ii_magic = IDX_INFO_MAGIC;
1050
1051         /* extract hash to start with */
1052         rdpg->rp_hash = req_ii->ii_hash_start;
1053
1054         /* extract requested attributes */
1055         rdpg->rp_attrs = req_ii->ii_attrs;
1056
1057         /* check that fid packed in request is valid and supported */
1058         if (!fid_is_sane(&req_ii->ii_fid))
1059                 RETURN(-EINVAL);
1060         rep_ii->ii_fid = req_ii->ii_fid;
1061
1062         /* copy flags */
1063         rep_ii->ii_flags = req_ii->ii_flags;
1064
1065         /* compute number of pages to allocate, ii_count is the number of 4KB
1066          * containers */
1067         if (req_ii->ii_count <= 0)
1068                 GOTO(out, rc = -EFAULT);
1069         rdpg->rp_count = min_t(unsigned int, req_ii->ii_count << LU_PAGE_SHIFT,
1070                                exp_max_brw_size(tsi->tsi_exp));
1071         rdpg->rp_npages = (rdpg->rp_count + PAGE_CACHE_SIZE -1) >> PAGE_CACHE_SHIFT;
1072
1073         /* allocate pages to store the containers */
1074         OBD_ALLOC(rdpg->rp_pages, rdpg->rp_npages * sizeof(rdpg->rp_pages[0]));
1075         if (rdpg->rp_pages == NULL)
1076                 GOTO(out, rc = -ENOMEM);
1077         for (i = 0; i < rdpg->rp_npages; i++) {
1078                 rdpg->rp_pages[i] = alloc_page(GFP_IOFS);
1079                 if (rdpg->rp_pages[i] == NULL)
1080                         GOTO(out, rc = -ENOMEM);
1081         }
1082
1083         /* populate pages with key/record pairs */
1084         rc = dt_index_read(tsi->tsi_env, tsi->tsi_tgt->lut_bottom, rep_ii, rdpg);
1085         if (rc < 0)
1086                 GOTO(out, rc);
1087
1088         LASSERTF(rc <= rdpg->rp_count, "dt_index_read() returned more than "
1089                  "asked %d > %d\n", rc, rdpg->rp_count);
1090
1091         /* send pages to client */
1092         rc = tgt_sendpage(tsi, rdpg, rc);
1093         if (rc)
1094                 GOTO(out, rc);
1095         EXIT;
1096 out:
1097         if (rdpg->rp_pages) {
1098                 for (i = 0; i < rdpg->rp_npages; i++)
1099                         if (rdpg->rp_pages[i])
1100                                 __free_page(rdpg->rp_pages[i]);
1101                 OBD_FREE(rdpg->rp_pages,
1102                          rdpg->rp_npages * sizeof(rdpg->rp_pages[0]));
1103         }
1104         return rc;
1105 }
1106
1107 struct tgt_handler tgt_obd_handlers[] = {
1108 TGT_OBD_HDL    (0,      OBD_PING,               tgt_obd_ping),
1109 TGT_OBD_HDL_VAR(0,      OBD_LOG_CANCEL,         tgt_obd_log_cancel),
1110 TGT_OBD_HDL_VAR(0,      OBD_QC_CALLBACK,        tgt_obd_qc_callback),
1111 TGT_OBD_HDL    (0,      OBD_IDX_READ,           tgt_obd_idx_read)
1112 };
1113 EXPORT_SYMBOL(tgt_obd_handlers);
1114
1115 int tgt_sync(const struct lu_env *env, struct lu_target *tgt,
1116              struct dt_object *obj, __u64 start, __u64 end)
1117 {
1118         int rc = 0;
1119
1120         ENTRY;
1121
1122         /* if no objid is specified, it means "sync whole filesystem" */
1123         if (obj == NULL) {
1124                 rc = dt_sync(env, tgt->lut_bottom);
1125         } else if (dt_version_get(env, obj) >
1126                    tgt->lut_obd->obd_last_committed) {
1127                 rc = dt_object_sync(env, obj, start, end);
1128         }
1129
1130         RETURN(rc);
1131 }
1132 EXPORT_SYMBOL(tgt_sync);
1133 /*
1134  * Unified target DLM handlers.
1135  */
1136
1137 /* Ensure that data and metadata are synced to the disk when lock is cancelled
1138  * (if requested) */
1139 static int tgt_blocking_ast(struct ldlm_lock *lock, struct ldlm_lock_desc *desc,
1140                             void *data, int flag)
1141 {
1142         struct lu_env            env;
1143         struct lu_target        *tgt;
1144         struct dt_object        *obj;
1145         struct lu_fid            fid;
1146         int                      rc = 0;
1147
1148         ENTRY;
1149
1150         tgt = class_exp2tgt(lock->l_export);
1151
1152         if (flag == LDLM_CB_CANCELING &&
1153             (lock->l_granted_mode & (LCK_PW | LCK_GROUP)) &&
1154             (tgt->lut_sync_lock_cancel == ALWAYS_SYNC_ON_CANCEL ||
1155              (tgt->lut_sync_lock_cancel == BLOCKING_SYNC_ON_CANCEL &&
1156               lock->l_flags & LDLM_FL_CBPENDING))) {
1157                 __u64 start = 0;
1158                 __u64 end = OBD_OBJECT_EOF;
1159
1160                 rc = lu_env_init(&env, LCT_DT_THREAD);
1161                 if (unlikely(rc != 0))
1162                         RETURN(rc);
1163
1164                 ost_fid_from_resid(&fid, &lock->l_resource->lr_name,
1165                                    tgt->lut_lsd.lsd_osd_index);
1166                 obj = dt_locate(&env, tgt->lut_bottom, &fid);
1167                 if (IS_ERR(obj))
1168                         GOTO(err_env, rc = PTR_ERR(obj));
1169
1170                 if (!dt_object_exists(obj))
1171                         GOTO(err_put, rc = -ENOENT);
1172
1173                 if (lock->l_resource->lr_type == LDLM_EXTENT) {
1174                         start = lock->l_policy_data.l_extent.start;
1175                         end = lock->l_policy_data.l_extent.end;
1176                 }
1177
1178                 rc = tgt_sync(&env, tgt, obj, start, end);
1179                 if (rc < 0) {
1180                         CERROR("%s: syncing "DFID" ("LPU64"-"LPU64") on lock "
1181                                "cancel: rc = %d\n",
1182                                tgt_name(tgt), PFID(&fid),
1183                                lock->l_policy_data.l_extent.start,
1184                                lock->l_policy_data.l_extent.end, rc);
1185                 }
1186 err_put:
1187                 lu_object_put(&env, &obj->do_lu);
1188 err_env:
1189                 lu_env_fini(&env);
1190         }
1191
1192         rc = ldlm_server_blocking_ast(lock, desc, data, flag);
1193         RETURN(rc);
1194 }
1195
1196 static struct ldlm_callback_suite tgt_dlm_cbs = {
1197         .lcs_completion = ldlm_server_completion_ast,
1198         .lcs_blocking   = tgt_blocking_ast,
1199         .lcs_glimpse    = ldlm_server_glimpse_ast
1200 };
1201
1202 int tgt_enqueue(struct tgt_session_info *tsi)
1203 {
1204         struct ptlrpc_request *req = tgt_ses_req(tsi);
1205         int rc;
1206
1207         ENTRY;
1208         /*
1209          * tsi->tsi_dlm_req was already swapped and (if necessary) converted,
1210          * tsi->tsi_dlm_cbs was set by the *_req_handle() function.
1211          */
1212         LASSERT(tsi->tsi_dlm_req != NULL);
1213         rc = ldlm_handle_enqueue0(tsi->tsi_exp->exp_obd->obd_namespace, req,
1214                                   tsi->tsi_dlm_req, &tgt_dlm_cbs);
1215         if (rc)
1216                 RETURN(err_serious(rc));
1217
1218         switch (LUT_FAIL_CLASS(tsi->tsi_reply_fail_id)) {
1219         case LUT_FAIL_MDT:
1220                 tsi->tsi_reply_fail_id = OBD_FAIL_MDS_LDLM_REPLY_NET;
1221                 break;
1222         case LUT_FAIL_OST:
1223                 tsi->tsi_reply_fail_id = OBD_FAIL_OST_LDLM_REPLY_NET;
1224                 break;
1225         case LUT_FAIL_MGT:
1226                 tsi->tsi_reply_fail_id = OBD_FAIL_MGS_LDLM_REPLY_NET;
1227                 break;
1228         default:
1229                 tsi->tsi_reply_fail_id = OBD_FAIL_LDLM_REPLY;
1230                 break;
1231         }
1232         RETURN(req->rq_status);
1233 }
1234 EXPORT_SYMBOL(tgt_enqueue);
1235
1236 int tgt_convert(struct tgt_session_info *tsi)
1237 {
1238         struct ptlrpc_request *req = tgt_ses_req(tsi);
1239         int rc;
1240
1241         ENTRY;
1242         LASSERT(tsi->tsi_dlm_req);
1243         rc = ldlm_handle_convert0(req, tsi->tsi_dlm_req);
1244         if (rc)
1245                 RETURN(err_serious(rc));
1246
1247         RETURN(req->rq_status);
1248 }
1249
1250 int tgt_bl_callback(struct tgt_session_info *tsi)
1251 {
1252         return err_serious(-EOPNOTSUPP);
1253 }
1254
1255 int tgt_cp_callback(struct tgt_session_info *tsi)
1256 {
1257         return err_serious(-EOPNOTSUPP);
1258 }
1259
1260 /* generic LDLM target handler */
1261 struct tgt_handler tgt_dlm_handlers[] = {
1262 TGT_DLM_HDL    (HABEO_CLAVIS,   LDLM_ENQUEUE,           tgt_enqueue),
1263 TGT_DLM_HDL_VAR(HABEO_CLAVIS,   LDLM_CONVERT,           tgt_convert),
1264 TGT_DLM_HDL_VAR(0,              LDLM_BL_CALLBACK,       tgt_bl_callback),
1265 TGT_DLM_HDL_VAR(0,              LDLM_CP_CALLBACK,       tgt_cp_callback)
1266 };
1267 EXPORT_SYMBOL(tgt_dlm_handlers);
1268
1269 /*
1270  * Unified target LLOG handlers.
1271  */
1272 int tgt_llog_open(struct tgt_session_info *tsi)
1273 {
1274         int rc;
1275
1276         ENTRY;
1277
1278         rc = llog_origin_handle_open(tgt_ses_req(tsi));
1279
1280         RETURN(rc);
1281 }
1282 EXPORT_SYMBOL(tgt_llog_open);
1283
1284 int tgt_llog_close(struct tgt_session_info *tsi)
1285 {
1286         int rc;
1287
1288         ENTRY;
1289
1290         rc = llog_origin_handle_close(tgt_ses_req(tsi));
1291
1292         RETURN(rc);
1293 }
1294 EXPORT_SYMBOL(tgt_llog_close);
1295
1296
1297 int tgt_llog_destroy(struct tgt_session_info *tsi)
1298 {
1299         int rc;
1300
1301         ENTRY;
1302
1303         rc = llog_origin_handle_destroy(tgt_ses_req(tsi));
1304
1305         RETURN(rc);
1306 }
1307
1308 int tgt_llog_read_header(struct tgt_session_info *tsi)
1309 {
1310         int rc;
1311
1312         ENTRY;
1313
1314         rc = llog_origin_handle_read_header(tgt_ses_req(tsi));
1315
1316         RETURN(rc);
1317 }
1318 EXPORT_SYMBOL(tgt_llog_read_header);
1319
1320 int tgt_llog_next_block(struct tgt_session_info *tsi)
1321 {
1322         int rc;
1323
1324         ENTRY;
1325
1326         rc = llog_origin_handle_next_block(tgt_ses_req(tsi));
1327
1328         RETURN(rc);
1329 }
1330 EXPORT_SYMBOL(tgt_llog_next_block);
1331
1332 int tgt_llog_prev_block(struct tgt_session_info *tsi)
1333 {
1334         int rc;
1335
1336         ENTRY;
1337
1338         rc = llog_origin_handle_prev_block(tgt_ses_req(tsi));
1339
1340         RETURN(rc);
1341 }
1342 EXPORT_SYMBOL(tgt_llog_prev_block);
1343
1344 /* generic llog target handler */
1345 struct tgt_handler tgt_llog_handlers[] = {
1346 TGT_LLOG_HDL    (0,     LLOG_ORIGIN_HANDLE_CREATE,      tgt_llog_open),
1347 TGT_LLOG_HDL    (0,     LLOG_ORIGIN_HANDLE_NEXT_BLOCK,  tgt_llog_next_block),
1348 TGT_LLOG_HDL    (0,     LLOG_ORIGIN_HANDLE_READ_HEADER, tgt_llog_read_header),
1349 TGT_LLOG_HDL    (0,     LLOG_ORIGIN_HANDLE_PREV_BLOCK,  tgt_llog_prev_block),
1350 TGT_LLOG_HDL    (0,     LLOG_ORIGIN_HANDLE_DESTROY,     tgt_llog_destroy),
1351 TGT_LLOG_HDL_VAR(0,     LLOG_ORIGIN_HANDLE_CLOSE,       tgt_llog_close),
1352 };
1353 EXPORT_SYMBOL(tgt_llog_handlers);
1354
1355 /*
1356  * sec context handlers
1357  */
1358 /* XXX: Implement based on mdt_sec_ctx_handle()? */
1359 static int tgt_sec_ctx_handle(struct tgt_session_info *tsi)
1360 {
1361         return 0;
1362 }
1363
1364 struct tgt_handler tgt_sec_ctx_handlers[] = {
1365 TGT_SEC_HDL_VAR(0,      SEC_CTX_INIT,           tgt_sec_ctx_handle),
1366 TGT_SEC_HDL_VAR(0,      SEC_CTX_INIT_CONT,      tgt_sec_ctx_handle),
1367 TGT_SEC_HDL_VAR(0,      SEC_CTX_FINI,           tgt_sec_ctx_handle),
1368 };
1369 EXPORT_SYMBOL(tgt_sec_ctx_handlers);
1370
1371 int (*tgt_lfsck_in_notify)(const struct lu_env *env,
1372                            struct dt_device *key,
1373                            struct lfsck_request *lr,
1374                            struct thandle *th) = NULL;
1375
1376 void tgt_register_lfsck_in_notify(int (*notify)(const struct lu_env *,
1377                                                 struct dt_device *,
1378                                                 struct lfsck_request *,
1379                                                 struct thandle *))
1380 {
1381         tgt_lfsck_in_notify = notify;
1382 }
1383 EXPORT_SYMBOL(tgt_register_lfsck_in_notify);
1384
1385 static int (*tgt_lfsck_query)(const struct lu_env *env,
1386                               struct dt_device *key,
1387                               struct lfsck_request *lr) = NULL;
1388
1389 void tgt_register_lfsck_query(int (*query)(const struct lu_env *,
1390                                            struct dt_device *,
1391                                            struct lfsck_request *))
1392 {
1393         tgt_lfsck_query = query;
1394 }
1395 EXPORT_SYMBOL(tgt_register_lfsck_query);
1396
1397 /* LFSCK request handlers */
1398 static int tgt_handle_lfsck_notify(struct tgt_session_info *tsi)
1399 {
1400         const struct lu_env     *env = tsi->tsi_env;
1401         struct dt_device        *key = tsi->tsi_tgt->lut_bottom;
1402         struct lfsck_request    *lr;
1403         int                      rc;
1404         ENTRY;
1405
1406         lr = req_capsule_client_get(tsi->tsi_pill, &RMF_LFSCK_REQUEST);
1407         if (lr == NULL)
1408                 RETURN(-EPROTO);
1409
1410         rc = tgt_lfsck_in_notify(env, key, lr, NULL);
1411
1412         RETURN(rc);
1413 }
1414
1415 static int tgt_handle_lfsck_query(struct tgt_session_info *tsi)
1416 {
1417         struct lfsck_request    *request;
1418         struct lfsck_reply      *reply;
1419         int                      rc;
1420         ENTRY;
1421
1422         request = req_capsule_client_get(tsi->tsi_pill, &RMF_LFSCK_REQUEST);
1423         if (request == NULL)
1424                 RETURN(-EPROTO);
1425
1426         reply = req_capsule_server_get(tsi->tsi_pill, &RMF_LFSCK_REPLY);
1427         if (reply == NULL)
1428                 RETURN(-ENOMEM);
1429
1430         rc = tgt_lfsck_query(tsi->tsi_env, tsi->tsi_tgt->lut_bottom, request);
1431         reply->lr_status = rc;
1432
1433         RETURN(rc < 0 ? rc : 0);
1434 }
1435
1436 struct tgt_handler tgt_lfsck_handlers[] = {
1437 TGT_LFSCK_HDL(HABEO_REFERO,     LFSCK_NOTIFY,   tgt_handle_lfsck_notify),
1438 TGT_LFSCK_HDL(HABEO_REFERO,     LFSCK_QUERY,    tgt_handle_lfsck_query),
1439 };
1440 EXPORT_SYMBOL(tgt_lfsck_handlers);
1441
1442 /*
1443  * initialize per-thread page pool (bug 5137).
1444  */
1445 int tgt_io_thread_init(struct ptlrpc_thread *thread)
1446 {
1447         struct tgt_thread_big_cache *tbc;
1448
1449         ENTRY;
1450
1451         LASSERT(thread != NULL);
1452         LASSERT(thread->t_data == NULL);
1453
1454         OBD_ALLOC_LARGE(tbc, sizeof(*tbc));
1455         if (tbc == NULL)
1456                 RETURN(-ENOMEM);
1457         thread->t_data = tbc;
1458         RETURN(0);
1459 }
1460 EXPORT_SYMBOL(tgt_io_thread_init);
1461
1462 /*
1463  * free per-thread pool created by tgt_thread_init().
1464  */
1465 void tgt_io_thread_done(struct ptlrpc_thread *thread)
1466 {
1467         struct tgt_thread_big_cache *tbc;
1468
1469         ENTRY;
1470
1471         LASSERT(thread != NULL);
1472
1473         /*
1474          * be prepared to handle partially-initialized pools (because this is
1475          * called from ost_io_thread_init() for cleanup.
1476          */
1477         tbc = thread->t_data;
1478         if (tbc != NULL) {
1479                 OBD_FREE_LARGE(tbc, sizeof(*tbc));
1480                 thread->t_data = NULL;
1481         }
1482         EXIT;
1483 }
1484 EXPORT_SYMBOL(tgt_io_thread_done);
1485 /**
1486  * Helper function for getting server side [start, start+count] DLM lock
1487  * if asked by client.
1488  */
1489 int tgt_extent_lock(struct ldlm_namespace *ns, struct ldlm_res_id *res_id,
1490                     __u64 start, __u64 end, struct lustre_handle *lh,
1491                     int mode, __u64 *flags)
1492 {
1493         ldlm_policy_data_t       policy;
1494         int                      rc;
1495
1496         ENTRY;
1497
1498         LASSERT(lh != NULL);
1499         LASSERT(ns != NULL);
1500         LASSERT(!lustre_handle_is_used(lh));
1501
1502         policy.l_extent.gid = 0;
1503         policy.l_extent.start = start & PAGE_MASK;
1504
1505         /*
1506          * If ->o_blocks is EOF it means "lock till the end of the file".
1507          * Otherwise, it's size of an extent or hole being punched (in bytes).
1508          */
1509         if (end == OBD_OBJECT_EOF || end < start)
1510                 policy.l_extent.end = OBD_OBJECT_EOF;
1511         else
1512                 policy.l_extent.end = end | ~PAGE_MASK;
1513
1514         rc = ldlm_cli_enqueue_local(ns, res_id, LDLM_EXTENT, &policy, mode,
1515                                     flags, ldlm_blocking_ast,
1516                                     ldlm_completion_ast, ldlm_glimpse_ast,
1517                                     NULL, 0, LVB_T_NONE, NULL, lh);
1518         RETURN(rc == ELDLM_OK ? 0 : -EIO);
1519 }
1520 EXPORT_SYMBOL(tgt_extent_lock);
1521
1522 void tgt_extent_unlock(struct lustre_handle *lh, ldlm_mode_t mode)
1523 {
1524         LASSERT(lustre_handle_is_used(lh));
1525         ldlm_lock_decref(lh, mode);
1526 }
1527 EXPORT_SYMBOL(tgt_extent_unlock);
1528
1529 int tgt_brw_lock(struct ldlm_namespace *ns, struct ldlm_res_id *res_id,
1530                  struct obd_ioobj *obj, struct niobuf_remote *nb,
1531                  struct lustre_handle *lh, int mode)
1532 {
1533         __u64                    flags = 0;
1534         int                      nrbufs = obj->ioo_bufcnt;
1535         int                      i;
1536
1537         ENTRY;
1538
1539         LASSERT(mode == LCK_PR || mode == LCK_PW);
1540         LASSERT(!lustre_handle_is_used(lh));
1541
1542         if (nrbufs == 0 || !(nb[0].rnb_flags & OBD_BRW_SRVLOCK))
1543                 RETURN(0);
1544
1545         for (i = 1; i < nrbufs; i++)
1546                 if (!(nb[i].rnb_flags & OBD_BRW_SRVLOCK))
1547                         RETURN(-EFAULT);
1548
1549         RETURN(tgt_extent_lock(ns, res_id, nb[0].rnb_offset,
1550                                nb[nrbufs - 1].rnb_offset +
1551                                nb[nrbufs - 1].rnb_len - 1,
1552                                lh, mode, &flags));
1553 }
1554
1555 void tgt_brw_unlock(struct obd_ioobj *obj, struct niobuf_remote *niob,
1556                     struct lustre_handle *lh, int mode)
1557 {
1558         ENTRY;
1559
1560         LASSERT(mode == LCK_PR || mode == LCK_PW);
1561         LASSERT((obj->ioo_bufcnt > 0 &&
1562                  (niob[0].rnb_flags & OBD_BRW_SRVLOCK)) ==
1563                 lustre_handle_is_used(lh));
1564
1565         if (lustre_handle_is_used(lh))
1566                 tgt_extent_unlock(lh, mode);
1567         EXIT;
1568 }
1569
1570 static __u32 tgt_checksum_bulk(struct lu_target *tgt,
1571                                struct ptlrpc_bulk_desc *desc, int opc,
1572                                cksum_type_t cksum_type)
1573 {
1574         struct cfs_crypto_hash_desc     *hdesc;
1575         unsigned int                    bufsize;
1576         int                             i, err;
1577         unsigned char                   cfs_alg = cksum_obd2cfs(cksum_type);
1578         __u32                           cksum;
1579
1580         hdesc = cfs_crypto_hash_init(cfs_alg, NULL, 0);
1581         if (IS_ERR(hdesc)) {
1582                 CERROR("%s: unable to initialize checksum hash %s\n",
1583                        tgt_name(tgt), cfs_crypto_hash_name(cfs_alg));
1584                 return PTR_ERR(hdesc);
1585         }
1586
1587         CDEBUG(D_INFO, "Checksum for algo %s\n", cfs_crypto_hash_name(cfs_alg));
1588         for (i = 0; i < desc->bd_iov_count; i++) {
1589                 /* corrupt the data before we compute the checksum, to
1590                  * simulate a client->OST data error */
1591                 if (i == 0 && opc == OST_WRITE &&
1592                     OBD_FAIL_CHECK(OBD_FAIL_OST_CHECKSUM_RECEIVE)) {
1593                         int off = desc->bd_iov[i].kiov_offset & ~PAGE_MASK;
1594                         int len = desc->bd_iov[i].kiov_len;
1595                         struct page *np = tgt_page_to_corrupt;
1596                         char *ptr = kmap(desc->bd_iov[i].kiov_page) + off;
1597
1598                         if (np) {
1599                                 char *ptr2 = kmap(np) + off;
1600
1601                                 memcpy(ptr2, ptr, len);
1602                                 memcpy(ptr2, "bad3", min(4, len));
1603                                 kunmap(np);
1604                                 desc->bd_iov[i].kiov_page = np;
1605                         } else {
1606                                 CERROR("%s: can't alloc page for corruption\n",
1607                                        tgt_name(tgt));
1608                         }
1609                 }
1610                 cfs_crypto_hash_update_page(hdesc, desc->bd_iov[i].kiov_page,
1611                                   desc->bd_iov[i].kiov_offset & ~PAGE_MASK,
1612                                   desc->bd_iov[i].kiov_len);
1613
1614                  /* corrupt the data after we compute the checksum, to
1615                  * simulate an OST->client data error */
1616                 if (i == 0 && opc == OST_READ &&
1617                     OBD_FAIL_CHECK(OBD_FAIL_OST_CHECKSUM_SEND)) {
1618                         int off = desc->bd_iov[i].kiov_offset & ~PAGE_MASK;
1619                         int len = desc->bd_iov[i].kiov_len;
1620                         struct page *np = tgt_page_to_corrupt;
1621                         char *ptr = kmap(desc->bd_iov[i].kiov_page) + off;
1622
1623                         if (np) {
1624                                 char *ptr2 = kmap(np) + off;
1625
1626                                 memcpy(ptr2, ptr, len);
1627                                 memcpy(ptr2, "bad4", min(4, len));
1628                                 kunmap(np);
1629                                 desc->bd_iov[i].kiov_page = np;
1630                         } else {
1631                                 CERROR("%s: can't alloc page for corruption\n",
1632                                        tgt_name(tgt));
1633                         }
1634                 }
1635         }
1636
1637         bufsize = sizeof(cksum);
1638         err = cfs_crypto_hash_final(hdesc, (unsigned char *)&cksum, &bufsize);
1639
1640         return cksum;
1641 }
1642
1643 int tgt_brw_read(struct tgt_session_info *tsi)
1644 {
1645         struct ptlrpc_request   *req = tgt_ses_req(tsi);
1646         struct ptlrpc_bulk_desc *desc = NULL;
1647         struct obd_export       *exp = tsi->tsi_exp;
1648         struct niobuf_remote    *remote_nb;
1649         struct niobuf_local     *local_nb;
1650         struct obd_ioobj        *ioo;
1651         struct ost_body         *body, *repbody;
1652         struct l_wait_info       lwi;
1653         struct lustre_handle     lockh = { 0 };
1654         int                      npages, nob = 0, rc, i, no_reply = 0;
1655         struct tgt_thread_big_cache *tbc = req->rq_svc_thread->t_data;
1656
1657         ENTRY;
1658
1659         if (ptlrpc_req2svc(req)->srv_req_portal != OST_IO_PORTAL) {
1660                 CERROR("%s: deny read request from %s to portal %u\n",
1661                        tgt_name(tsi->tsi_tgt),
1662                        obd_export_nid2str(req->rq_export),
1663                        ptlrpc_req2svc(req)->srv_req_portal);
1664                 RETURN(-EPROTO);
1665         }
1666
1667         req->rq_bulk_read = 1;
1668
1669         if (OBD_FAIL_CHECK(OBD_FAIL_OST_BRW_READ_BULK))
1670                 RETURN(-EIO);
1671
1672         OBD_FAIL_TIMEOUT(OBD_FAIL_OST_BRW_PAUSE_BULK, cfs_fail_val > 0 ?
1673                          cfs_fail_val : (obd_timeout + 1) / 4);
1674
1675         /* Check if there is eviction in progress, and if so, wait for it to
1676          * finish */
1677         if (unlikely(atomic_read(&exp->exp_obd->obd_evict_inprogress))) {
1678                 /* We do not care how long it takes */
1679                 lwi = LWI_INTR(NULL, NULL);
1680                 rc = l_wait_event(exp->exp_obd->obd_evict_inprogress_waitq,
1681                          !atomic_read(&exp->exp_obd->obd_evict_inprogress),
1682                          &lwi);
1683         }
1684
1685         /* There must be big cache in current thread to process this request
1686          * if it is NULL then something went wrong and it wasn't allocated,
1687          * report -ENOMEM in that case */
1688         if (tbc == NULL)
1689                 RETURN(-ENOMEM);
1690
1691         body = tsi->tsi_ost_body;
1692         LASSERT(body != NULL);
1693
1694         ioo = req_capsule_client_get(tsi->tsi_pill, &RMF_OBD_IOOBJ);
1695         LASSERT(ioo != NULL); /* must exists after tgt_ost_body_unpack */
1696
1697         remote_nb = req_capsule_client_get(&req->rq_pill, &RMF_NIOBUF_REMOTE);
1698         LASSERT(remote_nb != NULL); /* must exists after tgt_ost_body_unpack */
1699
1700         local_nb = tbc->local;
1701
1702         rc = tgt_brw_lock(exp->exp_obd->obd_namespace, &tsi->tsi_resid, ioo,
1703                           remote_nb, &lockh, LCK_PR);
1704         if (rc != 0)
1705                 RETURN(rc);
1706
1707         /*
1708          * If getting the lock took more time than
1709          * client was willing to wait, drop it. b=11330
1710          */
1711         if (cfs_time_current_sec() > req->rq_deadline ||
1712             OBD_FAIL_CHECK(OBD_FAIL_OST_DROP_REQ)) {
1713                 no_reply = 1;
1714                 CERROR("Dropping timed-out read from %s because locking"
1715                        "object "DOSTID" took %ld seconds (limit was %ld).\n",
1716                        libcfs_id2str(req->rq_peer), POSTID(&ioo->ioo_oid),
1717                        cfs_time_current_sec() - req->rq_arrival_time.tv_sec,
1718                        req->rq_deadline - req->rq_arrival_time.tv_sec);
1719                 GOTO(out_lock, rc = -ETIMEDOUT);
1720         }
1721
1722         repbody = req_capsule_server_get(&req->rq_pill, &RMF_OST_BODY);
1723         repbody->oa = body->oa;
1724
1725         npages = PTLRPC_MAX_BRW_PAGES;
1726         rc = obd_preprw(tsi->tsi_env, OBD_BRW_READ, exp, &repbody->oa, 1,
1727                         ioo, remote_nb, &npages, local_nb, NULL);
1728         if (rc != 0)
1729                 GOTO(out_lock, rc);
1730
1731         desc = ptlrpc_prep_bulk_exp(req, npages, ioobj_max_brw_get(ioo),
1732                                     BULK_PUT_SOURCE, OST_BULK_PORTAL);
1733         if (desc == NULL)
1734                 GOTO(out_commitrw, rc = -ENOMEM);
1735
1736         nob = 0;
1737         for (i = 0; i < npages; i++) {
1738                 int page_rc = local_nb[i].lnb_rc;
1739
1740                 if (page_rc < 0) {
1741                         rc = page_rc;
1742                         break;
1743                 }
1744
1745                 nob += page_rc;
1746                 if (page_rc != 0) { /* some data! */
1747                         LASSERT(local_nb[i].lnb_page != NULL);
1748                         ptlrpc_prep_bulk_page_nopin(desc, local_nb[i].lnb_page,
1749                                                     local_nb[i].lnb_page_offset,
1750                                                     page_rc);
1751                 }
1752
1753                 if (page_rc != local_nb[i].lnb_len) { /* short read */
1754                         /* All subsequent pages should be 0 */
1755                         while (++i < npages)
1756                                 LASSERT(local_nb[i].lnb_rc == 0);
1757                         break;
1758                 }
1759         }
1760
1761         if (body->oa.o_valid & OBD_MD_FLCKSUM) {
1762                 cksum_type_t cksum_type =
1763                         cksum_type_unpack(body->oa.o_valid & OBD_MD_FLFLAGS ?
1764                                           body->oa.o_flags : 0);
1765                 repbody->oa.o_flags = cksum_type_pack(cksum_type);
1766                 repbody->oa.o_valid = OBD_MD_FLCKSUM | OBD_MD_FLFLAGS;
1767                 repbody->oa.o_cksum = tgt_checksum_bulk(tsi->tsi_tgt, desc,
1768                                                         OST_READ, cksum_type);
1769                 CDEBUG(D_PAGE, "checksum at read origin: %x\n",
1770                        repbody->oa.o_cksum);
1771         } else {
1772                 repbody->oa.o_valid = 0;
1773         }
1774         /* We're finishing using body->oa as an input variable */
1775
1776         /* Check if client was evicted while we were doing i/o before touching
1777          * network */
1778         if (likely(rc == 0 &&
1779                    !CFS_FAIL_PRECHECK(OBD_FAIL_PTLRPC_CLIENT_BULK_CB2))) {
1780                 rc = target_bulk_io(exp, desc, &lwi);
1781                 no_reply = rc != 0;
1782         }
1783
1784 out_commitrw:
1785         /* Must commit after prep above in all cases */
1786         rc = obd_commitrw(tsi->tsi_env, OBD_BRW_READ, exp,
1787                           &repbody->oa, 1, ioo, remote_nb, npages, local_nb,
1788                           NULL, rc);
1789         if (rc == 0)
1790                 tgt_drop_id(exp, &repbody->oa);
1791 out_lock:
1792         tgt_brw_unlock(ioo, remote_nb, &lockh, LCK_PR);
1793
1794         if (desc && !CFS_FAIL_PRECHECK(OBD_FAIL_PTLRPC_CLIENT_BULK_CB2))
1795                 ptlrpc_free_bulk_nopin(desc);
1796
1797         LASSERT(rc <= 0);
1798         if (rc == 0) {
1799                 rc = nob;
1800                 ptlrpc_lprocfs_brw(req, nob);
1801         } else if (no_reply) {
1802                 req->rq_no_reply = 1;
1803                 /* reply out callback would free */
1804                 ptlrpc_req_drop_rs(req);
1805                 LCONSOLE_WARN("%s: Bulk IO read error with %s (at %s), "
1806                               "client will retry: rc %d\n",
1807                               exp->exp_obd->obd_name,
1808                               obd_uuid2str(&exp->exp_client_uuid),
1809                               obd_export_nid2str(exp), rc);
1810         }
1811         /* send a bulk after reply to simulate a network delay or reordering
1812          * by a router */
1813         if (unlikely(CFS_FAIL_PRECHECK(OBD_FAIL_PTLRPC_CLIENT_BULK_CB2))) {
1814                 wait_queue_head_t        waitq;
1815                 struct l_wait_info       lwi1;
1816
1817                 CDEBUG(D_INFO, "reorder BULK\n");
1818                 init_waitqueue_head(&waitq);
1819
1820                 lwi1 = LWI_TIMEOUT_INTR(cfs_time_seconds(3), NULL, NULL, NULL);
1821                 l_wait_event(waitq, 0, &lwi1);
1822                 target_bulk_io(exp, desc, &lwi);
1823                 ptlrpc_free_bulk_nopin(desc);
1824         }
1825
1826         RETURN(rc);
1827 }
1828 EXPORT_SYMBOL(tgt_brw_read);
1829
1830 static void tgt_warn_on_cksum(struct ptlrpc_request *req,
1831                               struct ptlrpc_bulk_desc *desc,
1832                               struct niobuf_local *local_nb, int npages,
1833                               u32 client_cksum, u32 server_cksum,
1834                               bool mmap)
1835 {
1836         struct obd_export *exp = req->rq_export;
1837         struct ost_body *body;
1838         char *router = "";
1839         char *via = "";
1840
1841         body = req_capsule_client_get(&req->rq_pill, &RMF_OST_BODY);
1842         LASSERT(body != NULL);
1843
1844         if (req->rq_peer.nid != desc->bd_sender) {
1845                 via = " via ";
1846                 router = libcfs_nid2str(desc->bd_sender);
1847         }
1848
1849         if (mmap) {
1850                 CDEBUG_LIMIT(D_INFO, "client csum %x, server csum %x\n",
1851                              client_cksum, server_cksum);
1852                 return;
1853         }
1854
1855         LCONSOLE_ERROR_MSG(0x168, "BAD WRITE CHECKSUM: %s from %s%s%s inode "
1856                            DFID" object "DOSTID" extent ["LPU64"-"LPU64
1857                            "]: client csum %x, server csum %x\n",
1858                            exp->exp_obd->obd_name, libcfs_id2str(req->rq_peer),
1859                            via, router,
1860                            body->oa.o_valid & OBD_MD_FLFID ?
1861                            body->oa.o_parent_seq : (__u64)0,
1862                            body->oa.o_valid & OBD_MD_FLFID ?
1863                            body->oa.o_parent_oid : 0,
1864                            body->oa.o_valid & OBD_MD_FLFID ?
1865                            body->oa.o_parent_ver : 0,
1866                            POSTID(&body->oa.o_oi),
1867                            local_nb[0].lnb_file_offset,
1868                            local_nb[npages-1].lnb_file_offset +
1869                            local_nb[npages - 1].lnb_len - 1,
1870                            client_cksum, server_cksum);
1871 }
1872
1873 int tgt_brw_write(struct tgt_session_info *tsi)
1874 {
1875         struct ptlrpc_request   *req = tgt_ses_req(tsi);
1876         struct ptlrpc_bulk_desc *desc = NULL;
1877         struct obd_export       *exp = req->rq_export;
1878         struct niobuf_remote    *remote_nb;
1879         struct niobuf_local     *local_nb;
1880         struct obd_ioobj        *ioo;
1881         struct ost_body         *body, *repbody;
1882         struct l_wait_info       lwi;
1883         struct lustre_handle     lockh = {0};
1884         __u32                   *rcs;
1885         int                      objcount, niocount, npages;
1886         int                      rc, i, j;
1887         cksum_type_t             cksum_type = OBD_CKSUM_CRC32;
1888         bool                     no_reply = false, mmap;
1889         struct tgt_thread_big_cache *tbc = req->rq_svc_thread->t_data;
1890
1891         ENTRY;
1892
1893         if (ptlrpc_req2svc(req)->srv_req_portal != OST_IO_PORTAL) {
1894                 CERROR("%s: deny write request from %s to portal %u\n",
1895                        tgt_name(tsi->tsi_tgt),
1896                        obd_export_nid2str(req->rq_export),
1897                        ptlrpc_req2svc(req)->srv_req_portal);
1898                 RETURN(err_serious(-EPROTO));
1899         }
1900
1901         if (OBD_FAIL_CHECK(OBD_FAIL_OST_ENOSPC))
1902                 RETURN(err_serious(-ENOSPC));
1903         if (OBD_FAIL_TIMEOUT(OBD_FAIL_OST_EROFS, 1))
1904                 RETURN(err_serious(-EROFS));
1905
1906         req->rq_bulk_write = 1;
1907
1908         if (OBD_FAIL_CHECK(OBD_FAIL_OST_BRW_WRITE_BULK))
1909                 RETURN(err_serious(-EIO));
1910         if (OBD_FAIL_CHECK(OBD_FAIL_OST_BRW_WRITE_BULK2))
1911                 RETURN(err_serious(-EFAULT));
1912
1913         /* pause before transaction has been started */
1914         CFS_FAIL_TIMEOUT(OBD_FAIL_OST_BRW_PAUSE_BULK, cfs_fail_val > 0 ?
1915                          cfs_fail_val : (obd_timeout + 1) / 4);
1916
1917         /* There must be big cache in current thread to process this request
1918          * if it is NULL then something went wrong and it wasn't allocated,
1919          * report -ENOMEM in that case */
1920         if (tbc == NULL)
1921                 RETURN(-ENOMEM);
1922
1923         body = tsi->tsi_ost_body;
1924         LASSERT(body != NULL);
1925
1926         ioo = req_capsule_client_get(&req->rq_pill, &RMF_OBD_IOOBJ);
1927         LASSERT(ioo != NULL); /* must exists after tgt_ost_body_unpack */
1928
1929         objcount = req_capsule_get_size(&req->rq_pill, &RMF_OBD_IOOBJ,
1930                                         RCL_CLIENT) / sizeof(*ioo);
1931
1932         for (niocount = i = 0; i < objcount; i++)
1933                 niocount += ioo[i].ioo_bufcnt;
1934
1935         remote_nb = req_capsule_client_get(&req->rq_pill, &RMF_NIOBUF_REMOTE);
1936         LASSERT(remote_nb != NULL); /* must exists after tgt_ost_body_unpack */
1937         if (niocount != req_capsule_get_size(&req->rq_pill,
1938                                              &RMF_NIOBUF_REMOTE, RCL_CLIENT) /
1939                         sizeof(*remote_nb))
1940                 RETURN(err_serious(-EPROTO));
1941
1942         if ((remote_nb[0].rnb_flags & OBD_BRW_MEMALLOC) &&
1943             (exp->exp_connection->c_peer.nid == exp->exp_connection->c_self))
1944                 memory_pressure_set();
1945
1946         req_capsule_set_size(&req->rq_pill, &RMF_RCS, RCL_SERVER,
1947                              niocount * sizeof(*rcs));
1948         rc = req_capsule_server_pack(&req->rq_pill);
1949         if (rc != 0)
1950                 GOTO(out, rc = err_serious(rc));
1951
1952         CFS_FAIL_TIMEOUT(OBD_FAIL_OST_BRW_PAUSE_PACK, cfs_fail_val);
1953         rcs = req_capsule_server_get(&req->rq_pill, &RMF_RCS);
1954
1955         local_nb = tbc->local;
1956
1957         rc = tgt_brw_lock(exp->exp_obd->obd_namespace, &tsi->tsi_resid, ioo,
1958                           remote_nb, &lockh, LCK_PW);
1959         if (rc != 0)
1960                 GOTO(out, rc);
1961
1962         /*
1963          * If getting the lock took more time than
1964          * client was willing to wait, drop it. b=11330
1965          */
1966         if (cfs_time_current_sec() > req->rq_deadline ||
1967             OBD_FAIL_CHECK(OBD_FAIL_OST_DROP_REQ)) {
1968                 no_reply = true;
1969                 CERROR("%s: Dropping timed-out write from %s because locking "
1970                        "object "DOSTID" took %ld seconds (limit was %ld).\n",
1971                        tgt_name(tsi->tsi_tgt), libcfs_id2str(req->rq_peer),
1972                        POSTID(&ioo->ioo_oid),
1973                        cfs_time_current_sec() - req->rq_arrival_time.tv_sec,
1974                        req->rq_deadline - req->rq_arrival_time.tv_sec);
1975                 GOTO(out_lock, rc = -ETIMEDOUT);
1976         }
1977
1978         /* Because we already sync grant info with client when reconnect,
1979          * grant info will be cleared for resent req, then fed_grant and
1980          * total_grant will not be modified in following preprw_write */
1981         if (lustre_msg_get_flags(req->rq_reqmsg) & (MSG_RESENT | MSG_REPLAY)) {
1982                 DEBUG_REQ(D_CACHE, req, "clear resent/replay req grant info");
1983                 body->oa.o_valid &= ~OBD_MD_FLGRANT;
1984         }
1985
1986         repbody = req_capsule_server_get(&req->rq_pill, &RMF_OST_BODY);
1987         if (repbody == NULL)
1988                 GOTO(out_lock, rc = -ENOMEM);
1989         repbody->oa = body->oa;
1990
1991         npages = PTLRPC_MAX_BRW_PAGES;
1992         rc = obd_preprw(tsi->tsi_env, OBD_BRW_WRITE, exp, &repbody->oa,
1993                         objcount, ioo, remote_nb, &npages, local_nb, NULL);
1994         if (rc < 0)
1995                 GOTO(out_lock, rc);
1996
1997         desc = ptlrpc_prep_bulk_exp(req, npages, ioobj_max_brw_get(ioo),
1998                                     BULK_GET_SINK, OST_BULK_PORTAL);
1999         if (desc == NULL)
2000                 GOTO(skip_transfer, rc = -ENOMEM);
2001
2002         /* NB Having prepped, we must commit... */
2003         for (i = 0; i < npages; i++)
2004                 ptlrpc_prep_bulk_page_nopin(desc, local_nb[i].lnb_page,
2005                                             local_nb[i].lnb_page_offset,
2006                                             local_nb[i].lnb_len);
2007
2008         rc = sptlrpc_svc_prep_bulk(req, desc);
2009         if (rc != 0)
2010                 GOTO(skip_transfer, rc);
2011
2012         rc = target_bulk_io(exp, desc, &lwi);
2013         no_reply = rc != 0;
2014
2015 skip_transfer:
2016         if (body->oa.o_valid & OBD_MD_FLCKSUM && rc == 0) {
2017                 static int cksum_counter;
2018
2019                 if (body->oa.o_valid & OBD_MD_FLFLAGS)
2020                         cksum_type = cksum_type_unpack(body->oa.o_flags);
2021
2022                 repbody->oa.o_valid |= OBD_MD_FLCKSUM | OBD_MD_FLFLAGS;
2023                 repbody->oa.o_flags &= ~OBD_FL_CKSUM_ALL;
2024                 repbody->oa.o_flags |= cksum_type_pack(cksum_type);
2025                 repbody->oa.o_cksum = tgt_checksum_bulk(tsi->tsi_tgt, desc,
2026                                                         OST_WRITE, cksum_type);
2027                 cksum_counter++;
2028
2029                 if (unlikely(body->oa.o_cksum != repbody->oa.o_cksum)) {
2030                         mmap = (body->oa.o_valid & OBD_MD_FLFLAGS &&
2031                                 body->oa.o_flags & OBD_FL_MMAP);
2032
2033                         tgt_warn_on_cksum(req, desc, local_nb, npages,
2034                                           body->oa.o_cksum,
2035                                           repbody->oa.o_cksum, mmap);
2036                         cksum_counter = 0;
2037                 } else if ((cksum_counter & (-cksum_counter)) ==
2038                            cksum_counter) {
2039                         CDEBUG(D_INFO, "Checksum %u from %s OK: %x\n",
2040                                cksum_counter, libcfs_id2str(req->rq_peer),
2041                                repbody->oa.o_cksum);
2042                 }
2043         }
2044
2045         /* Must commit after prep above in all cases */
2046         rc = obd_commitrw(tsi->tsi_env, OBD_BRW_WRITE, exp, &repbody->oa,
2047                           objcount, ioo, remote_nb, npages, local_nb, NULL,
2048                           rc);
2049         if (rc == -ENOTCONN)
2050                 /* quota acquire process has been given up because
2051                  * either the client has been evicted or the client
2052                  * has timed out the request already */
2053                 no_reply = true;
2054
2055         /*
2056          * Disable sending mtime back to the client. If the client locked the
2057          * whole object, then it has already updated the mtime on its side,
2058          * otherwise it will have to glimpse anyway (see bug 21489, comment 32)
2059          */
2060         repbody->oa.o_valid &= ~(OBD_MD_FLMTIME | OBD_MD_FLATIME);
2061
2062         if (rc == 0) {
2063                 int nob = 0;
2064
2065                 /* set per-requested niobuf return codes */
2066                 for (i = j = 0; i < niocount; i++) {
2067                         int len = remote_nb[i].rnb_len;
2068
2069                         nob += len;
2070                         rcs[i] = 0;
2071                         do {
2072                                 LASSERT(j < npages);
2073                                 if (local_nb[j].lnb_rc < 0)
2074                                         rcs[i] = local_nb[j].lnb_rc;
2075                                 len -= local_nb[j].lnb_len;
2076                                 j++;
2077                         } while (len > 0);
2078                         LASSERT(len == 0);
2079                 }
2080                 LASSERT(j == npages);
2081                 ptlrpc_lprocfs_brw(req, nob);
2082
2083                 tgt_drop_id(exp, &repbody->oa);
2084         }
2085 out_lock:
2086         tgt_brw_unlock(ioo, remote_nb, &lockh, LCK_PW);
2087         if (desc)
2088                 ptlrpc_free_bulk_nopin(desc);
2089 out:
2090         if (no_reply) {
2091                 req->rq_no_reply = 1;
2092                 /* reply out callback would free */
2093                 ptlrpc_req_drop_rs(req);
2094                 LCONSOLE_WARN("%s: Bulk IO write error with %s (at %s), "
2095                               "client will retry: rc %d\n",
2096                               exp->exp_obd->obd_name,
2097                               obd_uuid2str(&exp->exp_client_uuid),
2098                               obd_export_nid2str(exp), rc);
2099         }
2100         memory_pressure_clr();
2101         RETURN(rc);
2102 }
2103 EXPORT_SYMBOL(tgt_brw_write);