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_valid & OBD_MD_FLFLAGS &&
 447                                           body->oa.o_flags & OBD_FL_SHORT_IO) ?
 448                                          remote_nb[0].rnb_len : 0);
 449                 }
 450
 451                 rc = req_capsule_server_pack(tsi->tsi_pill);
 452         }
 453
 454         if (likely(rc == 0)) {
 455                 /*
 456                  * Process request, there can be two types of rc:
 457                  * 1) errors with msg unpack/pack, other failures outside the
 458                  * operation itself. This is counted as serious errors;
 459                  * 2) errors during fs operation, should be placed in rq_status
 460                  * only
 461                  */
 462                 rc = h->th_act(tsi);
 463                 if (!is_serious(rc) &&
 464                     !req->rq_no_reply && req->rq_reply_state == NULL) {
 465                         DEBUG_REQ(D_ERROR, req, "%s \"handler\" %s did not "
 466                                   "pack reply and returned 0 error\n",
 467                                   tgt_name(tsi->tsi_tgt), h->th_name);
 468                         LBUG();
 469                 }
 470                 serious = is_serious(rc);
 471                 rc = clear_serious(rc);
 472         } else {
 473                 serious = 1;
 474         }
 475
 476         req->rq_status = rc;
 477
 478         /*
 479          * ELDLM_* codes which > 0 should be in rq_status only as well as
 480          * all non-serious errors.
 481          */
 482         if (rc > 0 || !serious)
 483                 rc = 0;
 484
 485         LASSERT(current->journal_info == NULL);
 486
 487         if (likely(rc == 0 && req->rq_export))
 488                 target_committed_to_req(req);
 489
 490 out:
 491         target_send_reply(req, rc, tsi->tsi_reply_fail_id);
 492         RETURN(0);
 493 }
 494
 495 static int tgt_filter_recovery_request(struct ptlrpc_request *req,
 496                                        struct obd_device *obd, int *process)
 497 {
 498         switch (lustre_msg_get_opc(req->rq_reqmsg)) {
 499         case MDS_DISCONNECT:
 500         case OST_DISCONNECT:
 501         case OBD_IDX_READ:
 502                 *process = 1;
 503                 RETURN(0);
 504         case MDS_CLOSE:
 505         case MDS_SYNC: /* used in unmounting */
 506         case OBD_PING:
 507         case MDS_REINT:
 508         case OUT_UPDATE:
 509         case SEQ_QUERY:
 510         case FLD_QUERY:
 511         case FLD_READ:
 512         case LDLM_ENQUEUE:
 513         case OST_CREATE:
 514         case OST_DESTROY:
 515         case OST_PUNCH:
 516         case OST_SETATTR:
 517         case OST_SYNC:
 518         case OST_WRITE:
 519         case MDS_HSM_PROGRESS:
 520         case MDS_HSM_STATE_SET:
 521         case MDS_HSM_REQUEST:
 522                 *process = target_queue_recovery_request(req, obd);
 523                 RETURN(0);
 524
 525         default:
 526                 DEBUG_REQ(D_ERROR, req, "not permitted during recovery");
 527                 *process = -EAGAIN;
 528                 RETURN(0);
 529         }
 530 }
 531
 532 /*
 533  * Handle recovery. Return:
 534  *        +1: continue request processing;
 535  *       -ve: abort immediately with the given error code;
 536  *         0: send reply with error code in req->rq_status;
 537  */
 538 static int tgt_handle_recovery(struct ptlrpc_request *req, int reply_fail_id)
 539 {
 540         ENTRY;
 541
 542         switch (lustre_msg_get_opc(req->rq_reqmsg)) {
 543         case MDS_CONNECT:
 544         case OST_CONNECT:
 545         case MGS_CONNECT:
 546         case SEC_CTX_INIT:
 547         case SEC_CTX_INIT_CONT:
 548         case SEC_CTX_FINI:
 549                 RETURN(+1);
 550         }
 551
 552         if (!req->rq_export->exp_obd->obd_replayable)
 553                 RETURN(+1);
 554
 555         /* sanity check: if the xid matches, the request must be marked as a
 556          * resent or replayed */
 557         if (req_can_reconstruct(req, NULL)) {
 558                 if (!(lustre_msg_get_flags(req->rq_reqmsg) &
 559                       (MSG_RESENT | MSG_REPLAY))) {
 560                         DEBUG_REQ(D_WARNING, req, "rq_xid %llu matches "
 561                                   "saved xid, expected REPLAY or RESENT flag "
 562                                   "(%x)", req->rq_xid,
 563                                   lustre_msg_get_flags(req->rq_reqmsg));
 564                         req->rq_status = -ENOTCONN;
 565                         RETURN(-ENOTCONN);
 566                 }
 567         }
 568         /* else: note the opposite is not always true; a RESENT req after a
 569          * failover will usually not match the last_xid, since it was likely
 570          * never committed. A REPLAYed request will almost never match the
 571          * last xid, however it could for a committed, but still retained,
 572          * open. */
 573
 574         /* Check for aborted recovery... */
 575         if (unlikely(req->rq_export->exp_obd->obd_recovering)) {
 576                 int rc;
 577                 int should_process;
 578
 579                 DEBUG_REQ(D_INFO, req, "Got new replay");
 580                 rc = tgt_filter_recovery_request(req, req->rq_export->exp_obd,
 581                                                  &should_process);
 582                 if (rc != 0 || !should_process)
 583                         RETURN(rc);
 584                 else if (should_process < 0) {
 585                         req->rq_status = should_process;
 586                         rc = ptlrpc_error(req);
 587                         RETURN(rc);
 588                 }
 589         }
 590         RETURN(+1);
 591 }
 592
 593 /* Initial check for request, it is validation mostly */
 594 static struct tgt_handler *tgt_handler_find_check(struct ptlrpc_request *req)
 595 {
 596         struct tgt_handler      *h;
 597         struct tgt_opc_slice    *s;
 598         struct lu_target        *tgt;
 599         __u32                    opc = lustre_msg_get_opc(req->rq_reqmsg);
 600
 601         ENTRY;
 602
 603         tgt = class_exp2tgt(req->rq_export);
 604         if (unlikely(tgt == NULL)) {
 605                 DEBUG_REQ(D_ERROR, req, "%s: No target for connected export\n",
 606                           class_exp2obd(req->rq_export)->obd_name);
 607                 RETURN(ERR_PTR(-EINVAL));
 608         }
 609
 610         for (s = tgt->lut_slice; s->tos_hs != NULL; s++)
 611                 if (s->tos_opc_start <= opc && opc < s->tos_opc_end)
 612                         break;
 613
 614         /* opcode was not found in slice */
 615         if (unlikely(s->tos_hs == NULL)) {
 616                 static bool printed;
 617
 618                 /* don't print error messages for known unhandled RPCs */
 619                 if (opc != OST_FALLOCATE && opc != OST_SEEK && !printed) {
 620                         CERROR("%s: no handler for opcode 0x%x from %s\n",
 621                                tgt_name(tgt), opc, libcfs_id2str(req->rq_peer));
 622                         printed = true;
 623                 }
 624                 RETURN(ERR_PTR(-ENOTSUPP));
 625         }
 626
 627         LASSERT(opc >= s->tos_opc_start && opc < s->tos_opc_end);
 628         h = s->tos_hs + (opc - s->tos_opc_start);
 629         if (unlikely(h->th_opc == 0)) {
 630                 CERROR("%s: unsupported opcode 0x%x\n", tgt_name(tgt), opc);
 631                 RETURN(ERR_PTR(-ENOTSUPP));
 632         }
 633
 634         RETURN(h);
 635 }
 636
 637 static int process_req_last_xid(struct ptlrpc_request *req)
 638 {
 639         __u64   last_xid;
 640         ENTRY;
 641
 642         /* check request's xid is consistent with export's last_xid */
 643         last_xid = lustre_msg_get_last_xid(req->rq_reqmsg);
 644         if (last_xid > req->rq_export->exp_last_xid)
 645                 req->rq_export->exp_last_xid = last_xid;
 646
 647         if (req->rq_xid == 0 ||
 648             (req->rq_xid <= req->rq_export->exp_last_xid)) {
 649                 DEBUG_REQ(D_ERROR, req, "Unexpected xid %llx vs. "
 650                           "last_xid %llx\n", req->rq_xid,
 651                           req->rq_export->exp_last_xid);
 652                 /* Some request is allowed to be sent during replay,
 653                  * such as OUT update requests, FLD requests, so it
 654                  * is possible that replay requests has smaller XID
 655                  * than the exp_last_xid.
 656                  *
 657                  * Some non-replay requests may have smaller XID as
 658                  * well:
 659                  *
 660                  * - Client send a no_resend RPC, like statfs;
 661                  * - The RPC timedout (or some other error) on client,
 662                  *   then it's removed from the unreplied list;
 663                  * - Client send some other request to bump the
 664                  *   exp_last_xid on server;
 665                  * - The former RPC got chance to be processed;
 666                  */
 667                 if (!(lustre_msg_get_flags(req->rq_reqmsg) & MSG_REPLAY))
 668                         RETURN(-EPROTO);
 669         }
 670
 671         /* The "last_xid" is the minimum xid among unreplied requests,
 672          * if the request is from the previous connection, its xid can
 673          * still be larger than "exp_last_xid", then the above check of
 674          * xid is not enough to determine whether the request is delayed.
 675          *
 676          * For example, if some replay request was delayed and caused
 677          * timeout at client and the replay is restarted, the delayed
 678          * replay request will have the larger xid than "exp_last_xid"
 679          */
 680         if (req->rq_export->exp_conn_cnt >
 681             lustre_msg_get_conn_cnt(req->rq_reqmsg))
 682                 RETURN(-ESTALE);
 683
 684         /* try to release in-memory reply data */
 685         if (tgt_is_multimodrpcs_client(req->rq_export)) {
 686                 tgt_handle_received_xid(req->rq_export,
 687                                 lustre_msg_get_last_xid(req->rq_reqmsg));
 688                 if (!(lustre_msg_get_flags(req->rq_reqmsg) &
 689                       (MSG_RESENT | MSG_REPLAY)))
 690                         tgt_handle_tag(req->rq_export,
 691                                        lustre_msg_get_tag(req->rq_reqmsg));
 692         }
 693         RETURN(0);
 694 }
 695
 696 int tgt_request_handle(struct ptlrpc_request *req)
 697 {
 698         struct tgt_session_info *tsi = tgt_ses_info(req->rq_svc_thread->t_env);
 699
 700         struct lustre_msg       *msg = req->rq_reqmsg;
 701         struct tgt_handler      *h;
 702         struct lu_target        *tgt;
 703         int                      request_fail_id = 0;
 704         __u32                    opc = lustre_msg_get_opc(msg);
 705         struct obd_device       *obd;
 706         int                      rc;
 707         bool                     is_connect = false;
 708         ENTRY;
 709
 710         if (unlikely(OBD_FAIL_CHECK(OBD_FAIL_TGT_RECOVERY_REQ_RACE))) {
 711                 if (cfs_fail_val == 0 &&
 712                     lustre_msg_get_opc(msg) != OBD_PING &&
 713                     lustre_msg_get_flags(msg) & MSG_REQ_REPLAY_DONE) {
 714                         struct l_wait_info lwi =  { 0 };
 715
 716                         cfs_fail_val = 1;
 717                         cfs_race_state = 0;
 718                         l_wait_event(cfs_race_waitq, (cfs_race_state == 1),
 719                                      &lwi);
 720                 }
 721         }
 722
 723         req_capsule_init(&req->rq_pill, req, RCL_SERVER);
 724         tsi->tsi_pill = &req->rq_pill;
 725         tsi->tsi_env = req->rq_svc_thread->t_env;
 726
 727         /* if request has export then get handlers slice from corresponding
 728          * target, otherwise that should be connect operation */
 729         if (opc == MDS_CONNECT || opc == OST_CONNECT ||
 730             opc == MGS_CONNECT) {
 731                 is_connect = true;
 732                 req_capsule_set(&req->rq_pill, &RQF_CONNECT);
 733                 rc = target_handle_connect(req);
 734                 if (rc != 0) {
 735                         rc = ptlrpc_error(req);
 736                         GOTO(out, rc);
 737                 }
 738                 /* recovery-small test 18c asks to drop connect reply */
 739                 if (unlikely(opc == OST_CONNECT &&
 740                              OBD_FAIL_CHECK(OBD_FAIL_OST_CONNECT_NET2)))
 741                         GOTO(out, rc = 0);
 742         }
 743
 744         if (unlikely(!class_connected_export(req->rq_export))) {
 745                 if (opc == SEC_CTX_INIT || opc == SEC_CTX_INIT_CONT ||
 746                     opc == SEC_CTX_FINI) {
 747                         /* sec context initialization has to be handled
 748                          * by hand in tgt_handle_request0() */
 749                         tsi->tsi_reply_fail_id = OBD_FAIL_SEC_CTX_INIT_NET;
 750                         h = NULL;
 751                         GOTO(handle_recov, rc = 0);
 752                 }
 753                 CDEBUG(D_HA, "operation %d on unconnected OST from %s\n",
 754                        opc, libcfs_id2str(req->rq_peer));
 755                 req->rq_status = -ENOTCONN;
 756                 rc = ptlrpc_error(req);
 757                 GOTO(out, rc);
 758         }
 759
 760         tsi->tsi_tgt = tgt = class_exp2tgt(req->rq_export);
 761         tsi->tsi_exp = req->rq_export;
 762         if (exp_connect_flags(req->rq_export) & OBD_CONNECT_JOBSTATS)
 763                 tsi->tsi_jobid = lustre_msg_get_jobid(req->rq_reqmsg);
 764         else
 765                 tsi->tsi_jobid = NULL;
 766
 767         if (tgt == NULL) {
 768                 DEBUG_REQ(D_ERROR, req, "%s: No target for connected export\n",
 769                           class_exp2obd(req->rq_export)->obd_name);
 770                 req->rq_status = -EINVAL;
 771                 rc = ptlrpc_error(req);
 772                 GOTO(out, rc);
 773         }
 774
 775         /* Skip last_xid processing for the recovery thread, otherwise, the
 776          * last_xid on same request could be processed twice: first time when
 777          * processing the incoming request, second time when the request is
 778          * being processed by recovery thread. */
 779         obd = class_exp2obd(req->rq_export);
 780         if (is_connect) {
 781                 /* reset the exp_last_xid on each connection. */
 782                 req->rq_export->exp_last_xid = 0;
 783         } else if (obd->obd_recovery_data.trd_processing_task !=
 784                    current_pid()) {
 785                 rc = process_req_last_xid(req);
 786                 if (rc) {
 787                         req->rq_status = rc;
 788                         rc = ptlrpc_error(req);
 789                         GOTO(out, rc);
 790                 }
 791         }
 792
 793         request_fail_id = tgt->lut_request_fail_id;
 794         tsi->tsi_reply_fail_id = tgt->lut_reply_fail_id;
 795
 796         h = tgt_handler_find_check(req);
 797         if (IS_ERR(h)) {
 798                 req->rq_status = PTR_ERR(h);
 799                 rc = ptlrpc_error(req);
 800                 GOTO(out, rc);
 801         }
 802
 803         LASSERTF(h->th_opc == opc, "opcode mismatch %d != %d\n",
 804                  h->th_opc, opc);
 805
 806         if (CFS_FAIL_CHECK_ORSET(request_fail_id, CFS_FAIL_ONCE))
 807                 GOTO(out, rc = 0);
 808
 809         rc = lustre_msg_check_version(msg, h->th_version);
 810         if (unlikely(rc)) {
 811                 DEBUG_REQ(D_ERROR, req, "%s: drop mal-formed request, version"
 812                           " %08x, expecting %08x\n", tgt_name(tgt),
 813                           lustre_msg_get_version(msg), h->th_version);
 814                 req->rq_status = -EINVAL;
 815                 rc = ptlrpc_error(req);
 816                 GOTO(out, rc);
 817         }
 818
 819 handle_recov:
 820         rc = tgt_handle_recovery(req, tsi->tsi_reply_fail_id);
 821         if (likely(rc == 1)) {
 822                 rc = tgt_handle_request0(tsi, h, req);
 823                 if (rc)
 824                         GOTO(out, rc);
 825         }
 826         EXIT;
 827 out:
 828         req_capsule_fini(tsi->tsi_pill);
 829         if (tsi->tsi_corpus != NULL) {
 830                 lu_object_put(tsi->tsi_env, tsi->tsi_corpus);
 831                 tsi->tsi_corpus = NULL;
 832         }
 833         return rc;
 834 }
 835 EXPORT_SYMBOL(tgt_request_handle);
 836
 837 /** Assign high priority operations to the request if needed. */
 838 int tgt_hpreq_handler(struct ptlrpc_request *req)
 839 {
 840         struct tgt_session_info *tsi = tgt_ses_info(req->rq_svc_thread->t_env);
 841         struct tgt_handler      *h;
 842         int                      rc;
 843
 844         ENTRY;
 845
 846         if (req->rq_export == NULL)
 847                 RETURN(0);
 848
 849         req_capsule_init(&req->rq_pill, req, RCL_SERVER);
 850         tsi->tsi_pill = &req->rq_pill;
 851         tsi->tsi_env = req->rq_svc_thread->t_env;
 852         tsi->tsi_tgt = class_exp2tgt(req->rq_export);
 853         tsi->tsi_exp = req->rq_export;
 854
 855         h = tgt_handler_find_check(req);
 856         if (IS_ERR(h)) {
 857                 rc = PTR_ERR(h);
 858                 RETURN(rc);
 859         }
 860
 861         rc = tgt_request_preprocess(tsi, h, req);
 862         if (unlikely(rc != 0))
 863                 RETURN(rc);
 864
 865         if (h->th_hp != NULL)
 866                 h->th_hp(tsi);
 867         RETURN(0);
 868 }
 869 EXPORT_SYMBOL(tgt_hpreq_handler);
 870
 871 void tgt_counter_incr(struct obd_export *exp, int opcode)
 872 {
 873         lprocfs_counter_incr(exp->exp_obd->obd_stats, opcode);
 874         if (exp->exp_nid_stats && exp->exp_nid_stats->nid_stats != NULL)
 875                 lprocfs_counter_incr(exp->exp_nid_stats->nid_stats, opcode);
 876 }
 877 EXPORT_SYMBOL(tgt_counter_incr);
 878
 879 /*
 880  * Unified target generic handlers.
 881  */
 882
 883 int tgt_connect_check_sptlrpc(struct ptlrpc_request *req, struct obd_export *exp)
 884 {
 885         struct lu_target *tgt = class_exp2tgt(exp);
 886         struct sptlrpc_flavor flvr;
 887         int rc = 0;
 888
 889         LASSERT(tgt);
 890         LASSERT(tgt->lut_obd);
 891         LASSERT(tgt->lut_slice);
 892
 893         /* always allow ECHO client */
 894         if (unlikely(strcmp(exp->exp_obd->obd_type->typ_name,
 895                             LUSTRE_ECHO_NAME) == 0)) {
 896                 exp->exp_flvr.sf_rpc = SPTLRPC_FLVR_ANY;
 897                 return 0;
 898         }
 899
 900         if (exp->exp_flvr.sf_rpc == SPTLRPC_FLVR_INVALID) {
 901                 read_lock(&tgt->lut_sptlrpc_lock);
 902                 sptlrpc_target_choose_flavor(&tgt->lut_sptlrpc_rset,
 903                                              req->rq_sp_from,
 904                                              req->rq_peer.nid,
 905                                              &flvr);
 906                 read_unlock(&tgt->lut_sptlrpc_lock);
 907
 908                 spin_lock(&exp->exp_lock);
 909                 exp->exp_sp_peer = req->rq_sp_from;
 910                 exp->exp_flvr = flvr;
 911
 912                 /* when on mgs, if no restriction is set, or if the client
 913                  * NID is on the local node, allow any flavor
 914                  */
 915                 if ((strcmp(exp->exp_obd->obd_type->typ_name,
 916                            LUSTRE_MGS_NAME) == 0) &&
 917                      (exp->exp_flvr.sf_rpc == SPTLRPC_FLVR_NULL ||
 918                       LNetIsPeerLocal(exp->exp_connection->c_peer.nid)))
 919                         exp->exp_flvr.sf_rpc = SPTLRPC_FLVR_ANY;
 920
 921                 if (exp->exp_flvr.sf_rpc != SPTLRPC_FLVR_ANY &&
 922                     exp->exp_flvr.sf_rpc != req->rq_flvr.sf_rpc) {
 923                         CERROR("%s: unauthorized rpc flavor %x from %s, "
 924                                "expect %x\n", tgt_name(tgt),
 925                                req->rq_flvr.sf_rpc,
 926                                libcfs_nid2str(req->rq_peer.nid),
 927                                exp->exp_flvr.sf_rpc);
 928                         rc = -EACCES;
 929                 }
 930                 spin_unlock(&exp->exp_lock);
 931         } else {
 932                 if (exp->exp_sp_peer != req->rq_sp_from) {
 933                         CERROR("%s: RPC source %s doesn't match %s\n",
 934                                tgt_name(tgt),
 935                                sptlrpc_part2name(req->rq_sp_from),
 936                                sptlrpc_part2name(exp->exp_sp_peer));
 937                         rc = -EACCES;
 938                 } else {
 939                         rc = sptlrpc_target_export_check(exp, req);
 940                 }
 941         }
 942
 943         return rc;
 944 }
 945
 946 int tgt_adapt_sptlrpc_conf(struct lu_target *tgt)
 947 {
 948         struct sptlrpc_rule_set  tmp_rset;
 949         int                      rc;
 950
 951         if (unlikely(tgt == NULL)) {
 952                 CERROR("No target passed");
 953                 return -EINVAL;
 954         }
 955
 956         sptlrpc_rule_set_init(&tmp_rset);
 957         rc = sptlrpc_conf_target_get_rules(tgt->lut_obd, &tmp_rset);
 958         if (rc) {
 959                 CERROR("%s: failed get sptlrpc rules: rc = %d\n",
 960                        tgt_name(tgt), rc);
 961                 return rc;
 962         }
 963
 964         sptlrpc_target_update_exp_flavor(tgt->lut_obd, &tmp_rset);
 965
 966         write_lock(&tgt->lut_sptlrpc_lock);
 967         sptlrpc_rule_set_free(&tgt->lut_sptlrpc_rset);
 968         tgt->lut_sptlrpc_rset = tmp_rset;
 969         write_unlock(&tgt->lut_sptlrpc_lock);
 970
 971         return 0;
 972 }
 973 EXPORT_SYMBOL(tgt_adapt_sptlrpc_conf);
 974
 975 int tgt_connect(struct tgt_session_info *tsi)
 976 {
 977         struct ptlrpc_request   *req = tgt_ses_req(tsi);
 978         struct obd_connect_data *reply;
 979         int                      rc;
 980
 981         ENTRY;
 982
 983         /* XXX: better to call this check right after getting new export but
 984          * before last_rcvd slot allocation to avoid server load upon insecure
 985          * connects. This is to be fixed after unifiyng all targets.
 986          */
 987         rc = tgt_connect_check_sptlrpc(req, tsi->tsi_exp);
 988         if (rc)
 989                 GOTO(out, rc);
 990
 991         /* To avoid exposing partially initialized connection flags, changes up
 992          * to this point have been staged in reply->ocd_connect_flags. Now that
 993          * connection handling has completed successfully, atomically update
 994          * the connect flags in the shared export data structure. LU-1623 */
 995         reply = req_capsule_server_get(tsi->tsi_pill, &RMF_CONNECT_DATA);
 996         spin_lock(&tsi->tsi_exp->exp_lock);
 997         *exp_connect_flags_ptr(tsi->tsi_exp) = reply->ocd_connect_flags;
 998         if (reply->ocd_connect_flags & OBD_CONNECT_FLAGS2)
 999                 *exp_connect_flags2_ptr(tsi->tsi_exp) =
1000                         reply->ocd_connect_flags2;
1001         tsi->tsi_exp->exp_connect_data.ocd_brw_size = reply->ocd_brw_size;
1002         spin_unlock(&tsi->tsi_exp->exp_lock);
1003
1004         if (strcmp(tsi->tsi_exp->exp_obd->obd_type->typ_name,
1005                    LUSTRE_MDT_NAME) == 0) {
1006                 rc = req_check_sepol(tsi->tsi_pill);
1007                 if (rc)
1008                         GOTO(out, rc);
1009         }
1010
1011         RETURN(0);
1012 out:
1013         obd_disconnect(class_export_get(tsi->tsi_exp));
1014         return rc;
1015 }
1016 EXPORT_SYMBOL(tgt_connect);
1017
1018 int tgt_disconnect(struct tgt_session_info *tsi)
1019 {
1020         int rc;
1021
1022         ENTRY;
1023
1024         OBD_FAIL_TIMEOUT(OBD_FAIL_OST_DISCONNECT_DELAY, cfs_fail_val);
1025
1026         rc = target_handle_disconnect(tgt_ses_req(tsi));
1027         if (rc)
1028                 RETURN(err_serious(rc));
1029
1030         RETURN(rc);
1031 }
1032 EXPORT_SYMBOL(tgt_disconnect);
1033
1034 /*
1035  * Unified target OBD handlers
1036  */
1037 int tgt_obd_ping(struct tgt_session_info *tsi)
1038 {
1039         int rc;
1040
1041         ENTRY;
1042
1043         /* The target-specific part of OBD_PING request handling.
1044          * It controls Filter Modification Data (FMD) expiration each time
1045          * PING is received.
1046          *
1047          * Valid only for replayable targets, e.g. MDT and OFD
1048          */
1049         if (tsi->tsi_exp->exp_obd->obd_replayable)
1050                 tgt_fmd_expire(tsi->tsi_exp);
1051
1052         rc = req_capsule_server_pack(tsi->tsi_pill);
1053         if (rc)
1054                 RETURN(err_serious(rc));
1055
1056         RETURN(rc);
1057 }
1058 EXPORT_SYMBOL(tgt_obd_ping);
1059
1060 int tgt_obd_log_cancel(struct tgt_session_info *tsi)
1061 {
1062         return err_serious(-EOPNOTSUPP);
1063 }
1064
1065 int tgt_send_buffer(struct tgt_session_info *tsi, struct lu_rdbuf *rdbuf)
1066 {
1067         struct tgt_thread_info  *tti = tgt_th_info(tsi->tsi_env);
1068         struct ptlrpc_request   *req = tgt_ses_req(tsi);
1069         struct obd_export       *exp = req->rq_export;
1070         struct ptlrpc_bulk_desc *desc;
1071         struct l_wait_info      *lwi = &tti->tti_u.update.tti_wait_info;
1072         int                      i;
1073         int                      rc;
1074
1075         ENTRY;
1076
1077         desc = ptlrpc_prep_bulk_exp(req, rdbuf->rb_nbufs, 1,
1078                                   PTLRPC_BULK_PUT_SOURCE | PTLRPC_BULK_BUF_KVEC,
1079                                     MDS_BULK_PORTAL, &ptlrpc_bulk_kvec_ops);
1080         if (desc == NULL)
1081                 RETURN(-ENOMEM);
1082
1083         for (i = 0; i < rdbuf->rb_nbufs; i++)
1084                 desc->bd_frag_ops->add_iov_frag(desc,
1085                                         rdbuf->rb_bufs[i].lb_buf,
1086                                         rdbuf->rb_bufs[i].lb_len);
1087
1088         rc = target_bulk_io(exp, desc, lwi);
1089         ptlrpc_free_bulk(desc);
1090         RETURN(rc);
1091 }
1092 EXPORT_SYMBOL(tgt_send_buffer);
1093
1094 int tgt_sendpage(struct tgt_session_info *tsi, struct lu_rdpg *rdpg, int nob)
1095 {
1096         struct tgt_thread_info  *tti = tgt_th_info(tsi->tsi_env);
1097         struct ptlrpc_request   *req = tgt_ses_req(tsi);
1098         struct obd_export       *exp = req->rq_export;
1099         struct ptlrpc_bulk_desc *desc;
1100         struct l_wait_info      *lwi = &tti->tti_u.rdpg.tti_wait_info;
1101         int                      tmpcount;
1102         int                      tmpsize;
1103         int                      i;
1104         int                      rc;
1105
1106         ENTRY;
1107
1108         desc = ptlrpc_prep_bulk_exp(req, rdpg->rp_npages, 1,
1109                                     PTLRPC_BULK_PUT_SOURCE |
1110                                         PTLRPC_BULK_BUF_KIOV,
1111                                     MDS_BULK_PORTAL,
1112                                     &ptlrpc_bulk_kiov_pin_ops);
1113         if (desc == NULL)
1114                 RETURN(-ENOMEM);
1115
1116         if (!(exp_connect_flags(exp) & OBD_CONNECT_BRW_SIZE))
1117                 /* old client requires reply size in it's PAGE_SIZE,
1118                  * which is rdpg->rp_count */
1119                 nob = rdpg->rp_count;
1120
1121         for (i = 0, tmpcount = nob; i < rdpg->rp_npages && tmpcount > 0;
1122              i++, tmpcount -= tmpsize) {
1123                 tmpsize = min_t(int, tmpcount, PAGE_SIZE);
1124                 desc->bd_frag_ops->add_kiov_frag(desc, rdpg->rp_pages[i], 0,
1125                                                  tmpsize);
1126         }
1127
1128         LASSERT(desc->bd_nob == nob);
1129         rc = target_bulk_io(exp, desc, lwi);
1130         ptlrpc_free_bulk(desc);
1131         RETURN(rc);
1132 }
1133 EXPORT_SYMBOL(tgt_sendpage);
1134
1135 /*
1136  * OBD_IDX_READ handler
1137  */
1138 static int tgt_obd_idx_read(struct tgt_session_info *tsi)
1139 {
1140         struct tgt_thread_info  *tti = tgt_th_info(tsi->tsi_env);
1141         struct lu_rdpg          *rdpg = &tti->tti_u.rdpg.tti_rdpg;
1142         struct idx_info         *req_ii, *rep_ii;
1143         int                      rc, i;
1144
1145         ENTRY;
1146
1147         memset(rdpg, 0, sizeof(*rdpg));
1148         req_capsule_set(tsi->tsi_pill, &RQF_OBD_IDX_READ);
1149
1150         /* extract idx_info buffer from request & reply */
1151         req_ii = req_capsule_client_get(tsi->tsi_pill, &RMF_IDX_INFO);
1152         if (req_ii == NULL || req_ii->ii_magic != IDX_INFO_MAGIC)
1153                 RETURN(err_serious(-EPROTO));
1154
1155         rc = req_capsule_server_pack(tsi->tsi_pill);
1156         if (rc)
1157                 RETURN(err_serious(rc));
1158
1159         rep_ii = req_capsule_server_get(tsi->tsi_pill, &RMF_IDX_INFO);
1160         if (rep_ii == NULL)
1161                 RETURN(err_serious(-EFAULT));
1162         rep_ii->ii_magic = IDX_INFO_MAGIC;
1163
1164         /* extract hash to start with */
1165         rdpg->rp_hash = req_ii->ii_hash_start;
1166
1167         /* extract requested attributes */
1168         rdpg->rp_attrs = req_ii->ii_attrs;
1169
1170         /* check that fid packed in request is valid and supported */
1171         if (!fid_is_sane(&req_ii->ii_fid))
1172                 RETURN(-EINVAL);
1173         rep_ii->ii_fid = req_ii->ii_fid;
1174
1175         /* copy flags */
1176         rep_ii->ii_flags = req_ii->ii_flags;
1177
1178         /* compute number of pages to allocate, ii_count is the number of 4KB
1179          * containers */
1180         if (req_ii->ii_count <= 0)
1181                 GOTO(out, rc = -EFAULT);
1182         rdpg->rp_count = min_t(unsigned int, req_ii->ii_count << LU_PAGE_SHIFT,
1183                                exp_max_brw_size(tsi->tsi_exp));
1184         rdpg->rp_npages = (rdpg->rp_count + PAGE_SIZE - 1) >> PAGE_SHIFT;
1185
1186         /* allocate pages to store the containers */
1187         OBD_ALLOC(rdpg->rp_pages, rdpg->rp_npages * sizeof(rdpg->rp_pages[0]));
1188         if (rdpg->rp_pages == NULL)
1189                 GOTO(out, rc = -ENOMEM);
1190         for (i = 0; i < rdpg->rp_npages; i++) {
1191                 rdpg->rp_pages[i] = alloc_page(GFP_NOFS);
1192                 if (rdpg->rp_pages[i] == NULL)
1193                         GOTO(out, rc = -ENOMEM);
1194         }
1195
1196         /* populate pages with key/record pairs */
1197         rc = dt_index_read(tsi->tsi_env, tsi->tsi_tgt->lut_bottom, rep_ii, rdpg);
1198         if (rc < 0)
1199                 GOTO(out, rc);
1200
1201         LASSERTF(rc <= rdpg->rp_count, "dt_index_read() returned more than "
1202                  "asked %d > %d\n", rc, rdpg->rp_count);
1203
1204         /* send pages to client */
1205         rc = tgt_sendpage(tsi, rdpg, rc);
1206         if (rc)
1207                 GOTO(out, rc);
1208         EXIT;
1209 out:
1210         if (rdpg->rp_pages) {
1211                 for (i = 0; i < rdpg->rp_npages; i++)
1212                         if (rdpg->rp_pages[i])
1213                                 __free_page(rdpg->rp_pages[i]);
1214                 OBD_FREE(rdpg->rp_pages,
1215                          rdpg->rp_npages * sizeof(rdpg->rp_pages[0]));
1216         }
1217         return rc;
1218 }
1219
1220 struct tgt_handler tgt_obd_handlers[] = {
1221 TGT_OBD_HDL    (0,      OBD_PING,               tgt_obd_ping),
1222 TGT_OBD_HDL    (0,      OBD_IDX_READ,           tgt_obd_idx_read)
1223 };
1224 EXPORT_SYMBOL(tgt_obd_handlers);
1225
1226 int tgt_sync(const struct lu_env *env, struct lu_target *tgt,
1227              struct dt_object *obj, __u64 start, __u64 end)
1228 {
1229         int rc = 0;
1230
1231         ENTRY;
1232
1233         /* if no objid is specified, it means "sync whole filesystem" */
1234         if (obj == NULL) {
1235                 rc = dt_sync(env, tgt->lut_bottom);
1236         } else if (dt_version_get(env, obj) >
1237                    tgt->lut_obd->obd_last_committed) {
1238                 rc = dt_object_sync(env, obj, start, end);
1239         }
1240         atomic_inc(&tgt->lut_sync_count);
1241
1242         RETURN(rc);
1243 }
1244 EXPORT_SYMBOL(tgt_sync);
1245 /*
1246  * Unified target DLM handlers.
1247  */
1248
1249 /**
1250  * Unified target BAST
1251  *
1252  * Ensure data and metadata are synced to disk when lock is canceled if Sync on
1253  * Cancel (SOC) is enabled. If it's extent lock, normally sync obj is enough,
1254  * but if it's cross-MDT lock, because remote object version is not set, a
1255  * filesystem sync is needed.
1256  *
1257  * \param lock server side lock
1258  * \param desc lock desc
1259  * \param data ldlm_cb_set_arg
1260  * \param flag  indicates whether this cancelling or blocking callback
1261  * \retval      0 on success
1262  * \retval      negative number on error
1263  */
1264 static int tgt_blocking_ast(struct ldlm_lock *lock, struct ldlm_lock_desc *desc,
1265                             void *data, int flag)
1266 {
1267         struct lu_env            env;
1268         struct lu_target        *tgt;
1269         struct dt_object        *obj = NULL;
1270         struct lu_fid            fid;
1271         int                      rc = 0;
1272
1273         ENTRY;
1274
1275         tgt = class_exp2tgt(lock->l_export);
1276
1277         if (unlikely(tgt == NULL)) {
1278                 CDEBUG(D_ERROR, "%s: No target for connected export\n",
1279                        class_exp2obd(lock->l_export)->obd_name);
1280                 RETURN(-EINVAL);
1281         }
1282
1283         if (flag == LDLM_CB_CANCELING &&
1284             (lock->l_granted_mode & (LCK_EX | LCK_PW | LCK_GROUP)) &&
1285             (tgt->lut_sync_lock_cancel == SYNC_LOCK_CANCEL_ALWAYS ||
1286              (tgt->lut_sync_lock_cancel == SYNC_LOCK_CANCEL_BLOCKING &&
1287               ldlm_is_cbpending(lock))) &&
1288             ((exp_connect_flags(lock->l_export) & OBD_CONNECT_MDS_MDS) ||
1289              lock->l_resource->lr_type == LDLM_EXTENT)) {
1290                 __u64 start = 0;
1291                 __u64 end = OBD_OBJECT_EOF;
1292
1293                 rc = lu_env_init(&env, LCT_DT_THREAD);
1294                 if (unlikely(rc != 0))
1295                         GOTO(err, rc);
1296
1297                 ost_fid_from_resid(&fid, &lock->l_resource->lr_name,
1298                                    tgt->lut_lsd.lsd_osd_index);
1299
1300                 if (lock->l_resource->lr_type == LDLM_EXTENT) {
1301                         obj = dt_locate(&env, tgt->lut_bottom, &fid);
1302                         if (IS_ERR(obj))
1303                                 GOTO(err_env, rc = PTR_ERR(obj));
1304
1305                         if (!dt_object_exists(obj))
1306                                 GOTO(err_put, rc = -ENOENT);
1307
1308                         start = lock->l_policy_data.l_extent.start;
1309                         end = lock->l_policy_data.l_extent.end;
1310                 }
1311
1312                 rc = tgt_sync(&env, tgt, obj, start, end);
1313                 if (rc < 0) {
1314                         CERROR("%s: syncing "DFID" (%llu-%llu) on lock "
1315                                "cancel: rc = %d\n",
1316                                tgt_name(tgt), PFID(&fid),
1317                                lock->l_policy_data.l_extent.start,
1318                                lock->l_policy_data.l_extent.end, rc);
1319                 }
1320 err_put:
1321                 if (obj != NULL)
1322                         dt_object_put(&env, obj);
1323 err_env:
1324                 lu_env_fini(&env);
1325         }
1326 err:
1327         rc = ldlm_server_blocking_ast(lock, desc, data, flag);
1328         RETURN(rc);
1329 }
1330
1331 static struct ldlm_callback_suite tgt_dlm_cbs = {
1332         .lcs_completion = ldlm_server_completion_ast,
1333         .lcs_blocking   = tgt_blocking_ast,
1334         .lcs_glimpse    = ldlm_server_glimpse_ast
1335 };
1336
1337 int tgt_enqueue(struct tgt_session_info *tsi)
1338 {
1339         struct ptlrpc_request *req = tgt_ses_req(tsi);
1340         int rc;
1341
1342         ENTRY;
1343         /*
1344          * tsi->tsi_dlm_req was already swapped and (if necessary) converted,
1345          * tsi->tsi_dlm_cbs was set by the *_req_handle() function.
1346          */
1347         LASSERT(tsi->tsi_dlm_req != NULL);
1348         rc = ldlm_handle_enqueue0(tsi->tsi_exp->exp_obd->obd_namespace, req,
1349                                   tsi->tsi_dlm_req, &tgt_dlm_cbs);
1350         if (rc)
1351                 RETURN(err_serious(rc));
1352
1353         switch (LUT_FAIL_CLASS(tsi->tsi_reply_fail_id)) {
1354         case LUT_FAIL_MDT:
1355                 tsi->tsi_reply_fail_id = OBD_FAIL_MDS_LDLM_REPLY_NET;
1356                 break;
1357         case LUT_FAIL_OST:
1358                 tsi->tsi_reply_fail_id = OBD_FAIL_OST_LDLM_REPLY_NET;
1359                 break;
1360         case LUT_FAIL_MGT:
1361                 tsi->tsi_reply_fail_id = OBD_FAIL_MGS_LDLM_REPLY_NET;
1362                 break;
1363         default:
1364                 tsi->tsi_reply_fail_id = OBD_FAIL_LDLM_REPLY;
1365                 break;
1366         }
1367         RETURN(req->rq_status);
1368 }
1369 EXPORT_SYMBOL(tgt_enqueue);
1370
1371 int tgt_convert(struct tgt_session_info *tsi)
1372 {
1373         struct ptlrpc_request *req = tgt_ses_req(tsi);
1374         int rc;
1375
1376         ENTRY;
1377         LASSERT(tsi->tsi_dlm_req);
1378         rc = ldlm_handle_convert0(req, tsi->tsi_dlm_req);
1379         if (rc)
1380                 RETURN(err_serious(rc));
1381
1382         RETURN(req->rq_status);
1383 }
1384
1385 int tgt_bl_callback(struct tgt_session_info *tsi)
1386 {
1387         return err_serious(-EOPNOTSUPP);
1388 }
1389
1390 int tgt_cp_callback(struct tgt_session_info *tsi)
1391 {
1392         return err_serious(-EOPNOTSUPP);
1393 }
1394
1395 /* generic LDLM target handler */
1396 struct tgt_handler tgt_dlm_handlers[] = {
1397 TGT_DLM_HDL    (HABEO_CLAVIS,   LDLM_ENQUEUE,           tgt_enqueue),
1398 TGT_DLM_HDL    (HABEO_CLAVIS,   LDLM_CONVERT,           tgt_convert),
1399 TGT_DLM_HDL_VAR(0,              LDLM_BL_CALLBACK,       tgt_bl_callback),
1400 TGT_DLM_HDL_VAR(0,              LDLM_CP_CALLBACK,       tgt_cp_callback)
1401 };
1402 EXPORT_SYMBOL(tgt_dlm_handlers);
1403
1404 /*
1405  * Unified target LLOG handlers.
1406  */
1407 int tgt_llog_open(struct tgt_session_info *tsi)
1408 {
1409         int rc;
1410
1411         ENTRY;
1412
1413         rc = llog_origin_handle_open(tgt_ses_req(tsi));
1414
1415         RETURN(rc);
1416 }
1417 EXPORT_SYMBOL(tgt_llog_open);
1418
1419 int tgt_llog_read_header(struct tgt_session_info *tsi)
1420 {
1421         int rc;
1422
1423         ENTRY;
1424
1425         rc = llog_origin_handle_read_header(tgt_ses_req(tsi));
1426
1427         RETURN(rc);
1428 }
1429 EXPORT_SYMBOL(tgt_llog_read_header);
1430
1431 int tgt_llog_next_block(struct tgt_session_info *tsi)
1432 {
1433         int rc;
1434
1435         ENTRY;
1436
1437         rc = llog_origin_handle_next_block(tgt_ses_req(tsi));
1438
1439         RETURN(rc);
1440 }
1441 EXPORT_SYMBOL(tgt_llog_next_block);
1442
1443 int tgt_llog_prev_block(struct tgt_session_info *tsi)
1444 {
1445         int rc;
1446
1447         ENTRY;
1448
1449         rc = llog_origin_handle_prev_block(tgt_ses_req(tsi));
1450
1451         RETURN(rc);
1452 }
1453 EXPORT_SYMBOL(tgt_llog_prev_block);
1454
1455 /* generic llog target handler */
1456 struct tgt_handler tgt_llog_handlers[] = {
1457 TGT_LLOG_HDL    (0,     LLOG_ORIGIN_HANDLE_CREATE,      tgt_llog_open),
1458 TGT_LLOG_HDL    (0,     LLOG_ORIGIN_HANDLE_NEXT_BLOCK,  tgt_llog_next_block),
1459 TGT_LLOG_HDL    (0,     LLOG_ORIGIN_HANDLE_READ_HEADER, tgt_llog_read_header),
1460 TGT_LLOG_HDL    (0,     LLOG_ORIGIN_HANDLE_PREV_BLOCK,  tgt_llog_prev_block),
1461 };
1462 EXPORT_SYMBOL(tgt_llog_handlers);
1463
1464 /*
1465  * sec context handlers
1466  */
1467 /* XXX: Implement based on mdt_sec_ctx_handle()? */
1468 static int tgt_sec_ctx_handle(struct tgt_session_info *tsi)
1469 {
1470         return 0;
1471 }
1472
1473 struct tgt_handler tgt_sec_ctx_handlers[] = {
1474 TGT_SEC_HDL_VAR(0,      SEC_CTX_INIT,           tgt_sec_ctx_handle),
1475 TGT_SEC_HDL_VAR(0,      SEC_CTX_INIT_CONT,      tgt_sec_ctx_handle),
1476 TGT_SEC_HDL_VAR(0,      SEC_CTX_FINI,           tgt_sec_ctx_handle),
1477 };
1478 EXPORT_SYMBOL(tgt_sec_ctx_handlers);
1479
1480 int (*tgt_lfsck_in_notify_local)(const struct lu_env *env,
1481                                  struct dt_device *key,
1482                                  struct lfsck_req_local *lrl,
1483                                  struct thandle *th) = NULL;
1484
1485 void tgt_register_lfsck_in_notify_local(int (*notify)(const struct lu_env *,
1486                                                       struct dt_device *,
1487                                                       struct lfsck_req_local *,
1488                                                       struct thandle *))
1489 {
1490         tgt_lfsck_in_notify_local = notify;
1491 }
1492 EXPORT_SYMBOL(tgt_register_lfsck_in_notify_local);
1493
1494 int (*tgt_lfsck_in_notify)(const struct lu_env *env,
1495                            struct dt_device *key,
1496                            struct lfsck_request *lr) = NULL;
1497
1498 void tgt_register_lfsck_in_notify(int (*notify)(const struct lu_env *,
1499                                                 struct dt_device *,
1500                                                 struct lfsck_request *))
1501 {
1502         tgt_lfsck_in_notify = notify;
1503 }
1504 EXPORT_SYMBOL(tgt_register_lfsck_in_notify);
1505
1506 static int (*tgt_lfsck_query)(const struct lu_env *env,
1507                               struct dt_device *key,
1508                               struct lfsck_request *req,
1509                               struct lfsck_reply *rep,
1510                               struct lfsck_query *que) = NULL;
1511
1512 void tgt_register_lfsck_query(int (*query)(const struct lu_env *,
1513                                            struct dt_device *,
1514                                            struct lfsck_request *,
1515                                            struct lfsck_reply *,
1516                                            struct lfsck_query *))
1517 {
1518         tgt_lfsck_query = query;
1519 }
1520 EXPORT_SYMBOL(tgt_register_lfsck_query);
1521
1522 /* LFSCK request handlers */
1523 static int tgt_handle_lfsck_notify(struct tgt_session_info *tsi)
1524 {
1525         const struct lu_env     *env = tsi->tsi_env;
1526         struct dt_device        *key = tsi->tsi_tgt->lut_bottom;
1527         struct lfsck_request    *lr;
1528         int                      rc;
1529         ENTRY;
1530
1531         lr = req_capsule_client_get(tsi->tsi_pill, &RMF_LFSCK_REQUEST);
1532         if (lr == NULL)
1533                 RETURN(-EPROTO);
1534
1535         rc = tgt_lfsck_in_notify(env, key, lr);
1536
1537         RETURN(rc);
1538 }
1539
1540 static int tgt_handle_lfsck_query(struct tgt_session_info *tsi)
1541 {
1542         struct lfsck_request    *request;
1543         struct lfsck_reply      *reply;
1544         int                      rc;
1545         ENTRY;
1546
1547         request = req_capsule_client_get(tsi->tsi_pill, &RMF_LFSCK_REQUEST);
1548         if (request == NULL)
1549                 RETURN(-EPROTO);
1550
1551         reply = req_capsule_server_get(tsi->tsi_pill, &RMF_LFSCK_REPLY);
1552         if (reply == NULL)
1553                 RETURN(-ENOMEM);
1554
1555         rc = tgt_lfsck_query(tsi->tsi_env, tsi->tsi_tgt->lut_bottom,
1556                              request, reply, NULL);
1557
1558         RETURN(rc < 0 ? rc : 0);
1559 }
1560
1561 struct tgt_handler tgt_lfsck_handlers[] = {
1562 TGT_LFSCK_HDL(HABEO_REFERO,     LFSCK_NOTIFY,   tgt_handle_lfsck_notify),
1563 TGT_LFSCK_HDL(HABEO_REFERO,     LFSCK_QUERY,    tgt_handle_lfsck_query),
1564 };
1565 EXPORT_SYMBOL(tgt_lfsck_handlers);
1566
1567 /*
1568  * initialize per-thread page pool (bug 5137).
1569  */
1570 int tgt_io_thread_init(struct ptlrpc_thread *thread)
1571 {
1572         struct tgt_thread_big_cache *tbc;
1573
1574         ENTRY;
1575
1576         LASSERT(thread != NULL);
1577         LASSERT(thread->t_data == NULL);
1578
1579         OBD_ALLOC_LARGE(tbc, sizeof(*tbc));
1580         if (tbc == NULL)
1581                 RETURN(-ENOMEM);
1582         thread->t_data = tbc;
1583         RETURN(0);
1584 }
1585 EXPORT_SYMBOL(tgt_io_thread_init);
1586
1587 /*
1588  * free per-thread pool created by tgt_thread_init().
1589  */
1590 void tgt_io_thread_done(struct ptlrpc_thread *thread)
1591 {
1592         struct tgt_thread_big_cache *tbc;
1593
1594         ENTRY;
1595
1596         LASSERT(thread != NULL);
1597
1598         /*
1599          * be prepared to handle partially-initialized pools (because this is
1600          * called from ost_io_thread_init() for cleanup.
1601          */
1602         tbc = thread->t_data;
1603         if (tbc != NULL) {
1604                 OBD_FREE_LARGE(tbc, sizeof(*tbc));
1605                 thread->t_data = NULL;
1606         }
1607         EXIT;
1608 }
1609 EXPORT_SYMBOL(tgt_io_thread_done);
1610
1611 /**
1612  * Helper function for getting Data-on-MDT file server DLM lock
1613  * if asked by client.
1614  */
1615 int tgt_mdt_data_lock(struct ldlm_namespace *ns, struct ldlm_res_id *res_id,
1616                       struct lustre_handle *lh, int mode, __u64 *flags)
1617 {
1618         union ldlm_policy_data policy = {
1619                 .l_inodebits.bits = MDS_INODELOCK_DOM,
1620         };
1621         int rc;
1622
1623         ENTRY;
1624
1625         LASSERT(lh != NULL);
1626         LASSERT(ns != NULL);
1627         LASSERT(!lustre_handle_is_used(lh));
1628
1629         rc = ldlm_cli_enqueue_local(NULL, ns, res_id, LDLM_IBITS, &policy, mode,
1630                                     flags, ldlm_blocking_ast,
1631                                     ldlm_completion_ast, ldlm_glimpse_ast,
1632                                     NULL, 0, LVB_T_NONE, NULL, lh);
1633
1634         RETURN(rc == ELDLM_OK ? 0 : -EIO);
1635 }
1636 EXPORT_SYMBOL(tgt_mdt_data_lock);
1637
1638 void tgt_mdt_data_unlock(struct lustre_handle *lh, enum ldlm_mode mode)
1639 {
1640         LASSERT(lustre_handle_is_used(lh));
1641         ldlm_lock_decref(lh, mode);
1642 }
1643 EXPORT_SYMBOL(tgt_mdt_data_unlock);
1644
1645 /**
1646  * Helper function for getting server side [start, start+count] DLM lock
1647  * if asked by client.
1648  */
1649 int tgt_extent_lock(const struct lu_env *env, struct ldlm_namespace *ns,
1650                     struct ldlm_res_id *res_id, __u64 start, __u64 end,
1651                     struct lustre_handle *lh, int mode, __u64 *flags)
1652 {
1653         union ldlm_policy_data policy;
1654         int rc;
1655
1656         ENTRY;
1657
1658         LASSERT(lh != NULL);
1659         LASSERT(ns != NULL);
1660         LASSERT(!lustre_handle_is_used(lh));
1661
1662         policy.l_extent.gid = 0;
1663         policy.l_extent.start = start & PAGE_MASK;
1664
1665         /*
1666          * If ->o_blocks is EOF it means "lock till the end of the file".
1667          * Otherwise, it's size of an extent or hole being punched (in bytes).
1668          */
1669         if (end == OBD_OBJECT_EOF || end < start)
1670                 policy.l_extent.end = OBD_OBJECT_EOF;
1671         else
1672                 policy.l_extent.end = end | ~PAGE_MASK;
1673
1674         rc = ldlm_cli_enqueue_local(env, ns, res_id, LDLM_EXTENT, &policy,
1675                                     mode, flags, ldlm_blocking_ast,
1676                                     ldlm_completion_ast, ldlm_glimpse_ast,
1677                                     NULL, 0, LVB_T_NONE, NULL, lh);
1678         RETURN(rc == ELDLM_OK ? 0 : -EIO);
1679 }
1680 EXPORT_SYMBOL(tgt_extent_lock);
1681
1682 void tgt_extent_unlock(struct lustre_handle *lh, enum ldlm_mode mode)
1683 {
1684         LASSERT(lustre_handle_is_used(lh));
1685         ldlm_lock_decref(lh, mode);
1686 }
1687 EXPORT_SYMBOL(tgt_extent_unlock);
1688
1689 static int tgt_brw_lock(const struct lu_env *env, struct obd_export *exp,
1690                         struct ldlm_res_id *res_id, struct obd_ioobj *obj,
1691                         struct niobuf_remote *nb, struct lustre_handle *lh,
1692                         enum ldlm_mode mode)
1693 {
1694         struct ldlm_namespace   *ns = exp->exp_obd->obd_namespace;
1695         __u64                    flags = 0;
1696         int                      nrbufs = obj->ioo_bufcnt;
1697         int                      i;
1698         int                      rc;
1699
1700         ENTRY;
1701
1702         LASSERT(mode == LCK_PR || mode == LCK_PW);
1703         LASSERT(!lustre_handle_is_used(lh));
1704
1705         if (ns->ns_obd->obd_recovering)
1706                 RETURN(0);
1707
1708         if (nrbufs == 0 || !(nb[0].rnb_flags & OBD_BRW_SRVLOCK))
1709                 RETURN(0);
1710
1711         for (i = 1; i < nrbufs; i++)
1712                 if (!(nb[i].rnb_flags & OBD_BRW_SRVLOCK))
1713                         RETURN(-EFAULT);
1714
1715         /* MDT IO for data-on-mdt */
1716         if (exp->exp_connect_data.ocd_connect_flags & OBD_CONNECT_IBITS)
1717                 rc = tgt_mdt_data_lock(ns, res_id, lh, mode, &flags);
1718         else
1719                 rc = tgt_extent_lock(env, ns, res_id, nb[0].rnb_offset,
1720                                      nb[nrbufs - 1].rnb_offset +
1721                                      nb[nrbufs - 1].rnb_len - 1,
1722                                      lh, mode, &flags);
1723         RETURN(rc);
1724 }
1725
1726 static void tgt_brw_unlock(struct obd_ioobj *obj, struct niobuf_remote *niob,
1727                            struct lustre_handle *lh, enum ldlm_mode mode)
1728 {
1729         ENTRY;
1730
1731         LASSERT(mode == LCK_PR || mode == LCK_PW);
1732         LASSERT((obj->ioo_bufcnt > 0 &&
1733                  (niob[0].rnb_flags & OBD_BRW_SRVLOCK)) ==
1734                 lustre_handle_is_used(lh));
1735
1736         if (lustre_handle_is_used(lh))
1737                 tgt_extent_unlock(lh, mode);
1738         EXIT;
1739 }
1740 static int tgt_checksum_niobuf(struct lu_target *tgt,
1741                                  struct niobuf_local *local_nb, int npages,
1742                                  int opc, enum cksum_types cksum_type,
1743                                  __u32 *cksum)
1744 {
1745         struct ahash_request           *req;
1746         unsigned int                    bufsize;
1747         int                             i, err;
1748         unsigned char                   cfs_alg = cksum_obd2cfs(cksum_type);
1749
1750         req = cfs_crypto_hash_init(cfs_alg, NULL, 0);
1751         if (IS_ERR(req)) {
1752                 CERROR("%s: unable to initialize checksum hash %s\n",
1753                        tgt_name(tgt), cfs_crypto_hash_name(cfs_alg));
1754                 return PTR_ERR(req);
1755         }
1756
1757         CDEBUG(D_INFO, "Checksum for algo %s\n", cfs_crypto_hash_name(cfs_alg));
1758         for (i = 0; i < npages; i++) {
1759                 /* corrupt the data before we compute the checksum, to
1760                  * simulate a client->OST data error */
1761                 if (i == 0 && opc == OST_WRITE &&
1762                     OBD_FAIL_CHECK(OBD_FAIL_OST_CHECKSUM_RECEIVE)) {
1763                         int off = local_nb[i].lnb_page_offset & ~PAGE_MASK;
1764                         int len = local_nb[i].lnb_len;
1765                         struct page *np = tgt_page_to_corrupt;
1766
1767                         if (np) {
1768                                 char *ptr = ll_kmap_atomic(local_nb[i].lnb_page,
1769                                                         KM_USER0);
1770                                 char *ptr2 = page_address(np);
1771
1772                                 memcpy(ptr2 + off, ptr + off, len);
1773                                 memcpy(ptr2 + off, "bad3", min(4, len));
1774                                 ll_kunmap_atomic(ptr, KM_USER0);
1775
1776                                 /* LU-8376 to preserve original index for
1777                                  * display in dump_all_bulk_pages() */
1778                                 np->index = i;
1779
1780                                 cfs_crypto_hash_update_page(req, np, off,
1781                                                             len);
1782                                 continue;
1783                         } else {
1784                                 CERROR("%s: can't alloc page for corruption\n",
1785                                        tgt_name(tgt));
1786                         }
1787                 }
1788                 cfs_crypto_hash_update_page(req, local_nb[i].lnb_page,
1789                                   local_nb[i].lnb_page_offset & ~PAGE_MASK,
1790                                   local_nb[i].lnb_len);
1791
1792                  /* corrupt the data after we compute the checksum, to
1793                  * simulate an OST->client data error */
1794                 if (i == 0 && opc == OST_READ &&
1795                     OBD_FAIL_CHECK(OBD_FAIL_OST_CHECKSUM_SEND)) {
1796                         int off = local_nb[i].lnb_page_offset & ~PAGE_MASK;
1797                         int len = local_nb[i].lnb_len;
1798                         struct page *np = tgt_page_to_corrupt;
1799
1800                         if (np) {
1801                                 char *ptr = ll_kmap_atomic(local_nb[i].lnb_page,
1802                                                         KM_USER0);
1803                                 char *ptr2 = page_address(np);
1804
1805                                 memcpy(ptr2 + off, ptr + off, len);
1806                                 memcpy(ptr2 + off, "bad4", min(4, len));
1807                                 ll_kunmap_atomic(ptr, KM_USER0);
1808
1809                                 /* LU-8376 to preserve original index for
1810                                  * display in dump_all_bulk_pages() */
1811                                 np->index = i;
1812
1813                                 cfs_crypto_hash_update_page(req, np, off,
1814                                                             len);
1815                                 continue;
1816                         } else {
1817                                 CERROR("%s: can't alloc page for corruption\n",
1818                                        tgt_name(tgt));
1819                         }
1820                 }
1821         }
1822
1823         bufsize = sizeof(*cksum);
1824         err = cfs_crypto_hash_final(req, (unsigned char *)cksum, &bufsize);
1825
1826         return 0;
1827 }
1828
1829 char dbgcksum_file_name[PATH_MAX];
1830
1831 static void dump_all_bulk_pages(struct obdo *oa, int count,
1832                                 struct niobuf_local *local_nb,
1833                                 __u32 server_cksum, __u32 client_cksum)
1834 {
1835         struct file *filp;
1836         int rc, i;
1837         unsigned int len;
1838         char *buf;
1839
1840         /* will only keep dump of pages on first error for the same range in
1841          * file/fid, not during the resends/retries. */
1842         snprintf(dbgcksum_file_name, sizeof(dbgcksum_file_name),
1843                  "%s-checksum_dump-ost-"DFID":[%llu-%llu]-%x-%x",
1844                  (strncmp(libcfs_debug_file_path_arr, "NONE", 4) != 0 ?
1845                   libcfs_debug_file_path_arr :
1846                   LIBCFS_DEBUG_FILE_PATH_DEFAULT),
1847                  oa->o_valid & OBD_MD_FLFID ? oa->o_parent_seq : (__u64)0,
1848                  oa->o_valid & OBD_MD_FLFID ? oa->o_parent_oid : 0,
1849                  oa->o_valid & OBD_MD_FLFID ? oa->o_parent_ver : 0,
1850                  local_nb[0].lnb_file_offset,
1851                  local_nb[count-1].lnb_file_offset +
1852                  local_nb[count-1].lnb_len - 1, client_cksum, server_cksum);
1853         filp = filp_open(dbgcksum_file_name,
1854                          O_CREAT | O_EXCL | O_WRONLY | O_LARGEFILE, 0600);
1855         if (IS_ERR(filp)) {
1856                 rc = PTR_ERR(filp);
1857                 if (rc == -EEXIST)
1858                         CDEBUG(D_INFO, "%s: can't open to dump pages with "
1859                                "checksum error: rc = %d\n", dbgcksum_file_name,
1860                                rc);
1861                 else
1862                         CERROR("%s: can't open to dump pages with checksum "
1863                                "error: rc = %d\n", dbgcksum_file_name, rc);
1864                 return;
1865         }
1866
1867         for (i = 0; i < count; i++) {
1868                 len = local_nb[i].lnb_len;
1869                 buf = kmap(local_nb[i].lnb_page);
1870                 while (len != 0) {
1871                         rc = cfs_kernel_write(filp, buf, len, &filp->f_pos);
1872                         if (rc < 0) {
1873                                 CERROR("%s: wanted to write %u but got %d "
1874                                        "error\n", dbgcksum_file_name, len, rc);
1875                                 break;
1876                         }
1877                         len -= rc;
1878                         buf += rc;
1879                         CDEBUG(D_INFO, "%s: wrote %d bytes\n",
1880                                dbgcksum_file_name, rc);
1881                 }
1882                 kunmap(local_nb[i].lnb_page);
1883         }
1884
1885         rc = ll_vfs_fsync_range(filp, 0, LLONG_MAX, 1);
1886         if (rc)
1887                 CERROR("%s: sync returns %d\n", dbgcksum_file_name, rc);
1888         filp_close(filp, NULL);
1889         return;
1890 }
1891
1892 static int check_read_checksum(struct niobuf_local *local_nb, int npages,
1893                                struct obd_export *exp, struct obdo *oa,
1894                                const struct lnet_process_id *peer,
1895                                __u32 client_cksum, __u32 server_cksum,
1896                                enum cksum_types server_cksum_type)
1897 {
1898         char *msg;
1899         enum cksum_types cksum_type;
1900         loff_t start, end;
1901
1902         /* unlikely to happen and only if resend does not occur due to cksum
1903          * control failure on Client */
1904         if (unlikely(server_cksum == client_cksum)) {
1905                 CDEBUG(D_PAGE, "checksum %x confirmed upon retry\n",
1906                        client_cksum);
1907                 return 0;
1908         }
1909
1910         if (exp->exp_obd->obd_checksum_dump)
1911                 dump_all_bulk_pages(oa, npages, local_nb, server_cksum,
1912                                     client_cksum);
1913
1914         cksum_type = obd_cksum_type_unpack(oa->o_valid & OBD_MD_FLFLAGS ?
1915                                            oa->o_flags : 0);
1916
1917         if (cksum_type != server_cksum_type)
1918                 msg = "the server may have not used the checksum type specified"
1919                       " in the original request - likely a protocol problem";
1920         else
1921                 msg = "should have changed on the client or in transit";
1922
1923         start = local_nb[0].lnb_file_offset;
1924         end = local_nb[npages-1].lnb_file_offset +
1925                                         local_nb[npages-1].lnb_len - 1;
1926
1927         LCONSOLE_ERROR_MSG(0x132, "%s: BAD READ CHECKSUM: %s: from %s inode "
1928                 DFID " object "DOSTID" extent [%llu-%llu], client returned csum"
1929                 " %x (type %x), server csum %x (type %x)\n",
1930                 exp->exp_obd->obd_name,
1931                 msg, libcfs_nid2str(peer->nid),
1932                 oa->o_valid & OBD_MD_FLFID ? oa->o_parent_seq : 0ULL,
1933                 oa->o_valid & OBD_MD_FLFID ? oa->o_parent_oid : 0,
1934                 oa->o_valid & OBD_MD_FLFID ? oa->o_parent_ver : 0,
1935                 POSTID(&oa->o_oi),
1936                 start, end, client_cksum, cksum_type, server_cksum,
1937                 server_cksum_type);
1938
1939         return 1;
1940 }
1941
1942 static int tgt_pages2shortio(struct niobuf_local *local, int npages,
1943                              unsigned char *buf, int size)
1944 {
1945         int     i, off, len, copied = size;
1946         char    *ptr;
1947
1948         for (i = 0; i < npages; i++) {
1949                 off = local[i].lnb_page_offset & ~PAGE_MASK;
1950                 len = local[i].lnb_len;
1951
1952                 CDEBUG(D_PAGE, "index %d offset = %d len = %d left = %d\n",
1953                        i, off, len, size);
1954                 if (len > size)
1955                         return -EINVAL;
1956
1957                 ptr = ll_kmap_atomic(local[i].lnb_page, KM_USER0);
1958                 memcpy(buf + off, ptr, len);
1959                 ll_kunmap_atomic(ptr, KM_USER0);
1960                 buf += len;
1961                 size -= len;
1962         }
1963         return copied - size;
1964 }
1965
1966 static int tgt_checksum_niobuf_t10pi(struct lu_target *tgt,
1967                                      struct niobuf_local *local_nb,
1968                                      int npages, int opc,
1969                                      obd_dif_csum_fn *fn,
1970                                      int sector_size,
1971                                      u32 *check_sum)
1972 {
1973         enum cksum_types t10_cksum_type = tgt->lut_dt_conf.ddp_t10_cksum_type;
1974         unsigned char cfs_alg = cksum_obd2cfs(OBD_CKSUM_T10_TOP);
1975         const char *obd_name = tgt->lut_obd->obd_name;
1976         struct ahash_request *req;
1977         unsigned int bufsize;
1978         unsigned char *buffer;
1979         struct page *__page;
1980         __u16 *guard_start;
1981         int guard_number;
1982         int used_number = 0;
1983         __u32 cksum;
1984         int rc = 0;
1985         int used;
1986         int i;
1987
1988         __page = alloc_page(GFP_KERNEL);
1989         if (__page == NULL)
1990                 return -ENOMEM;
1991
1992         req = cfs_crypto_hash_init(cfs_alg, NULL, 0);
1993         if (IS_ERR(req)) {
1994                 CERROR("%s: unable to initialize checksum hash %s\n",
1995                        tgt_name(tgt), cfs_crypto_hash_name(cfs_alg));
1996                 return PTR_ERR(req);
1997         }
1998
1999         buffer = kmap(__page);
2000         guard_start = (__u16 *)buffer;
2001         guard_number = PAGE_SIZE / sizeof(*guard_start);
2002         for (i = 0; i < npages; i++) {
2003                 /* corrupt the data before we compute the checksum, to
2004                  * simulate a client->OST data error */
2005                 if (i == 0 && opc == OST_WRITE &&
2006                     OBD_FAIL_CHECK(OBD_FAIL_OST_CHECKSUM_RECEIVE)) {
2007                         int off = local_nb[i].lnb_page_offset & ~PAGE_MASK;
2008                         int len = local_nb[i].lnb_len;
2009                         struct page *np = tgt_page_to_corrupt;
2010
2011                         if (np) {
2012                                 char *ptr = ll_kmap_atomic(local_nb[i].lnb_page,
2013                                                         KM_USER0);
2014                                 char *ptr2 = page_address(np);
2015
2016                                 memcpy(ptr2 + off, ptr + off, len);
2017                                 memcpy(ptr2 + off, "bad3", min(4, len));
2018                                 ll_kunmap_atomic(ptr, KM_USER0);
2019
2020                                 /* LU-8376 to preserve original index for
2021                                  * display in dump_all_bulk_pages() */
2022                                 np->index = i;
2023
2024                                 cfs_crypto_hash_update_page(req, np, off,
2025                                                             len);
2026                                 continue;
2027                         } else {
2028                                 CERROR("%s: can't alloc page for corruption\n",
2029                                        tgt_name(tgt));
2030                         }
2031                 }
2032
2033                 /*
2034                  * The left guard number should be able to hold checksums of a
2035                  * whole page
2036                  */
2037                 if (t10_cksum_type && opc == OST_READ &&
2038                     local_nb[i].lnb_guard_disk) {
2039                         used = DIV_ROUND_UP(local_nb[i].lnb_len, sector_size);
2040                         if (used > (guard_number - used_number)) {
2041                                 rc = -E2BIG;
2042                                 break;
2043                         }
2044                         memcpy(guard_start + used_number,
2045                                local_nb[i].lnb_guards,
2046                                used * sizeof(*local_nb[i].lnb_guards));
2047                 } else {
2048                         rc = obd_page_dif_generate_buffer(obd_name,
2049                                 local_nb[i].lnb_page,
2050                                 local_nb[i].lnb_page_offset & ~PAGE_MASK,
2051                                 local_nb[i].lnb_len, guard_start + used_number,
2052                                 guard_number - used_number, &used, sector_size,
2053                                 fn);
2054                         if (rc)
2055                                 break;
2056                 }
2057
2058                 LASSERT(used <= MAX_GUARD_NUMBER);
2059                 /*
2060                  * If disk support T10PI checksum, copy guards to local_nb.
2061                  * If the write is partial page, do not use the guards for bio
2062                  * submission since the data might not be full-sector. The bio
2063                  * guards will be generated later based on the full sectors. If
2064                  * the sector size is 512B rather than 4 KB, or the page size
2065                  * is larger than 4KB, this might drop some useful guards for
2066                  * partial page write, but it will only add minimal extra time
2067                  * of checksum calculation.
2068                  */
2069                 if (t10_cksum_type && opc == OST_WRITE &&
2070                     local_nb[i].lnb_len == PAGE_SIZE) {
2071                         local_nb[i].lnb_guard_rpc = 1;
2072                         memcpy(local_nb[i].lnb_guards,
2073                                guard_start + used_number,
2074                                used * sizeof(*local_nb[i].lnb_guards));
2075                 }
2076
2077                 used_number += used;
2078                 if (used_number == guard_number) {
2079                         cfs_crypto_hash_update_page(req, __page, 0,
2080                                 used_number * sizeof(*guard_start));
2081                         used_number = 0;
2082                 }
2083
2084                  /* corrupt the data after we compute the checksum, to
2085                  * simulate an OST->client data error */
2086                 if (unlikely(i == 0 && opc == OST_READ &&
2087                              OBD_FAIL_CHECK(OBD_FAIL_OST_CHECKSUM_SEND))) {
2088                         int off = local_nb[i].lnb_page_offset & ~PAGE_MASK;
2089                         int len = local_nb[i].lnb_len;
2090                         struct page *np = tgt_page_to_corrupt;
2091
2092                         if (np) {
2093                                 char *ptr = ll_kmap_atomic(local_nb[i].lnb_page,
2094                                                         KM_USER0);
2095                                 char *ptr2 = page_address(np);
2096
2097                                 memcpy(ptr2 + off, ptr + off, len);
2098                                 memcpy(ptr2 + off, "bad4", min(4, len));
2099                                 ll_kunmap_atomic(ptr, KM_USER0);
2100
2101                                 /* LU-8376 to preserve original index for
2102                                  * display in dump_all_bulk_pages() */
2103                                 np->index = i;
2104
2105                                 cfs_crypto_hash_update_page(req, np, off,
2106                                                             len);
2107                                 continue;
2108                         } else {
2109                                 CERROR("%s: can't alloc page for corruption\n",
2110                                        tgt_name(tgt));
2111                         }
2112                 }
2113         }
2114         kunmap(__page);
2115         if (rc)
2116                 GOTO(out, rc);
2117
2118         if (used_number != 0)
2119                 cfs_crypto_hash_update_page(req, __page, 0,
2120                         used_number * sizeof(*guard_start));
2121
2122         bufsize = sizeof(cksum);
2123         rc = cfs_crypto_hash_final(req, (unsigned char *)&cksum, &bufsize);
2124
2125         if (rc == 0)
2126                 *check_sum = cksum;
2127 out:
2128         __free_page(__page);
2129         return rc;
2130 }
2131
2132 static int tgt_checksum_niobuf_rw(struct lu_target *tgt,
2133                                   enum cksum_types cksum_type,
2134                                   struct niobuf_local *local_nb,
2135                                   int npages, int opc, u32 *check_sum)
2136 {
2137         obd_dif_csum_fn *fn = NULL;
2138         int sector_size = 0;
2139         int rc;
2140
2141         ENTRY;
2142         obd_t10_cksum2dif(cksum_type, &fn, &sector_size);
2143
2144         if (fn)
2145                 rc = tgt_checksum_niobuf_t10pi(tgt, local_nb, npages,
2146                                                opc, fn, sector_size,
2147                                                check_sum);
2148         else
2149                 rc = tgt_checksum_niobuf(tgt, local_nb, npages, opc,
2150                                          cksum_type, check_sum);
2151         RETURN(rc);
2152 }
2153
2154 int tgt_brw_read(struct tgt_session_info *tsi)
2155 {
2156         struct ptlrpc_request   *req = tgt_ses_req(tsi);
2157         struct ptlrpc_bulk_desc *desc = NULL;
2158         struct obd_export       *exp = tsi->tsi_exp;
2159         struct niobuf_remote    *remote_nb;
2160         struct niobuf_local     *local_nb;
2161         struct obd_ioobj        *ioo;
2162         struct ost_body         *body, *repbody;
2163         struct l_wait_info       lwi;
2164         struct lustre_handle     lockh = { 0 };
2165         int                      npages, nob = 0, rc, i, no_reply = 0,
2166                                  npages_read;
2167         struct tgt_thread_big_cache *tbc = req->rq_svc_thread->t_data;
2168         const char *obd_name = exp->exp_obd->obd_name;
2169
2170         ENTRY;
2171
2172         if (ptlrpc_req2svc(req)->srv_req_portal != OST_IO_PORTAL &&
2173             ptlrpc_req2svc(req)->srv_req_portal != MDS_IO_PORTAL) {
2174                 CERROR("%s: deny read request from %s to portal %u\n",
2175                        tgt_name(tsi->tsi_tgt),
2176                        obd_export_nid2str(req->rq_export),
2177                        ptlrpc_req2svc(req)->srv_req_portal);
2178                 RETURN(-EPROTO);
2179         }
2180
2181         req->rq_bulk_read = 1;
2182
2183         if (OBD_FAIL_CHECK(OBD_FAIL_OST_BRW_READ_BULK))
2184                 RETURN(-EIO);
2185
2186         OBD_FAIL_TIMEOUT(OBD_FAIL_OST_BRW_PAUSE_BULK, cfs_fail_val > 0 ?
2187                          cfs_fail_val : (obd_timeout + 1) / 4);
2188
2189         /* Check if there is eviction in progress, and if so, wait for it to
2190          * finish */
2191         if (unlikely(atomic_read(&exp->exp_obd->obd_evict_inprogress))) {
2192                 /* We do not care how long it takes */
2193                 lwi = LWI_INTR(NULL, NULL);
2194                 rc = l_wait_event(exp->exp_obd->obd_evict_inprogress_waitq,
2195                          !atomic_read(&exp->exp_obd->obd_evict_inprogress),
2196                          &lwi);
2197         }
2198
2199         /* There must be big cache in current thread to process this request
2200          * if it is NULL then something went wrong and it wasn't allocated,
2201          * report -ENOMEM in that case */
2202         if (tbc == NULL)
2203                 RETURN(-ENOMEM);
2204
2205         body = tsi->tsi_ost_body;
2206         LASSERT(body != NULL);
2207
2208         ioo = req_capsule_client_get(tsi->tsi_pill, &RMF_OBD_IOOBJ);
2209         LASSERT(ioo != NULL); /* must exists after tgt_ost_body_unpack */
2210
2211         remote_nb = req_capsule_client_get(&req->rq_pill, &RMF_NIOBUF_REMOTE);
2212         LASSERT(remote_nb != NULL); /* must exists after tgt_ost_body_unpack */
2213
2214         local_nb = tbc->local;
2215
2216         rc = tgt_brw_lock(tsi->tsi_env, exp, &tsi->tsi_resid, ioo, remote_nb,
2217                           &lockh, LCK_PR);
2218         if (rc != 0)
2219                 RETURN(rc);
2220
2221         /*
2222          * If getting the lock took more time than
2223          * client was willing to wait, drop it. b=11330
2224          */
2225         if (ktime_get_real_seconds() > req->rq_deadline ||
2226             OBD_FAIL_CHECK(OBD_FAIL_OST_DROP_REQ)) {
2227                 no_reply = 1;
2228                 CERROR("Dropping timed-out read from %s because locking object " DOSTID " took %lld seconds (limit was %lld).\n",
2229                        libcfs_id2str(req->rq_peer), POSTID(&ioo->ioo_oid),
2230                        ktime_get_real_seconds() - req->rq_arrival_time.tv_sec,
2231                        req->rq_deadline - req->rq_arrival_time.tv_sec);
2232                 GOTO(out_lock, rc = -ETIMEDOUT);
2233         }
2234
2235         /*
2236          * Because we already sync grant info with client when
2237          * reconnect, grant info will be cleared for resent req,
2238          * otherwise, outdated grant count in the rpc would de-sync
2239          * grant counters in case of shrink
2240          */
2241         if (lustre_msg_get_flags(req->rq_reqmsg) & (MSG_RESENT | MSG_REPLAY)) {
2242                 DEBUG_REQ(D_CACHE, req, "clear resent/replay req grant info");
2243                 body->oa.o_valid &= ~OBD_MD_FLGRANT;
2244         }
2245
2246         repbody = req_capsule_server_get(&req->rq_pill, &RMF_OST_BODY);
2247         repbody->oa = body->oa;
2248
2249         npages = PTLRPC_MAX_BRW_PAGES;
2250         rc = obd_preprw(tsi->tsi_env, OBD_BRW_READ, exp, &repbody->oa, 1,
2251                         ioo, remote_nb, &npages, local_nb);
2252         if (rc != 0)
2253                 GOTO(out_lock, rc);
2254
2255         if (body->oa.o_valid & OBD_MD_FLFLAGS &&
2256             body->oa.o_flags & OBD_FL_SHORT_IO) {
2257                 desc = NULL;
2258         } else {
2259                 desc = ptlrpc_prep_bulk_exp(req, npages, ioobj_max_brw_get(ioo),
2260                                             PTLRPC_BULK_PUT_SOURCE |
2261                                                 PTLRPC_BULK_BUF_KIOV,
2262                                             OST_BULK_PORTAL,
2263                                             &ptlrpc_bulk_kiov_nopin_ops);
2264                 if (desc == NULL)
2265                         GOTO(out_commitrw, rc = -ENOMEM);
2266         }
2267
2268         nob = 0;
2269         npages_read = npages;
2270         for (i = 0; i < npages; i++) {
2271                 int page_rc = local_nb[i].lnb_rc;
2272
2273                 if (page_rc < 0) {
2274                         rc = page_rc;
2275                         npages_read = i;
2276                         break;
2277                 }
2278
2279                 nob += page_rc;
2280                 if (page_rc != 0 && desc != NULL) { /* some data! */
2281                         LASSERT(local_nb[i].lnb_page != NULL);
2282                         desc->bd_frag_ops->add_kiov_frag
2283                           (desc, local_nb[i].lnb_page,
2284                            local_nb[i].lnb_page_offset & ~PAGE_MASK,
2285                            page_rc);
2286                 }
2287
2288                 if (page_rc != local_nb[i].lnb_len) { /* short read */
2289                         local_nb[i].lnb_len = page_rc;
2290                         npages_read = i + (page_rc != 0 ? 1 : 0);
2291                         /* All subsequent pages should be 0 */
2292                         while (++i < npages)
2293                                 LASSERT(local_nb[i].lnb_rc == 0);
2294                         break;
2295                 }
2296         }
2297         if (OBD_FAIL_CHECK(OBD_FAIL_OST_READ_SIZE) &&
2298             nob != cfs_fail_val)
2299                 rc = -E2BIG;
2300
2301         if (body->oa.o_valid & OBD_MD_FLCKSUM) {
2302                 u32 flag = body->oa.o_valid & OBD_MD_FLFLAGS ?
2303                            body->oa.o_flags : 0;
2304                 enum cksum_types cksum_type = obd_cksum_type_unpack(flag);
2305
2306                 repbody->oa.o_flags = obd_cksum_type_pack(obd_name,
2307                                                           cksum_type);
2308                 repbody->oa.o_valid = OBD_MD_FLCKSUM | OBD_MD_FLFLAGS;
2309
2310                 rc = tgt_checksum_niobuf_rw(tsi->tsi_tgt, cksum_type,
2311                                             local_nb, npages_read, OST_READ,
2312                                             &repbody->oa.o_cksum);
2313                 if (rc < 0)
2314                         GOTO(out_commitrw, rc);
2315                 CDEBUG(D_PAGE, "checksum at read origin: %x\n",
2316                        repbody->oa.o_cksum);
2317
2318                 /* if a resend it could be for a cksum error, so check Server
2319                  * cksum with returned Client cksum (this should even cover
2320                  * zero-cksum case) */
2321                 if ((body->oa.o_valid & OBD_MD_FLFLAGS) &&
2322                     (body->oa.o_flags & OBD_FL_RECOV_RESEND))
2323                         check_read_checksum(local_nb, npages_read, exp,
2324                                             &body->oa, &req->rq_peer,
2325                                             body->oa.o_cksum,
2326                                             repbody->oa.o_cksum, cksum_type);
2327         } else {
2328                 repbody->oa.o_valid = 0;
2329         }
2330         if (body->oa.o_valid & OBD_MD_FLGRANT)
2331                 repbody->oa.o_valid |= OBD_MD_FLGRANT;
2332         /* We're finishing using body->oa as an input variable */
2333
2334         /* Check if client was evicted while we were doing i/o before touching
2335          * network */
2336         if (rc == 0) {
2337                 if (body->oa.o_valid & OBD_MD_FLFLAGS &&
2338                     body->oa.o_flags & OBD_FL_SHORT_IO) {
2339                         unsigned char *short_io_buf;
2340                         int short_io_size;
2341
2342                         short_io_buf = req_capsule_server_get(&req->rq_pill,
2343                                                               &RMF_SHORT_IO);
2344                         short_io_size = req_capsule_get_size(&req->rq_pill,
2345                                                              &RMF_SHORT_IO,
2346                                                              RCL_SERVER);
2347                         rc = tgt_pages2shortio(local_nb, npages_read,
2348                                                short_io_buf, short_io_size);
2349                         if (rc >= 0)
2350                                 req_capsule_shrink(&req->rq_pill,
2351                                                    &RMF_SHORT_IO, rc,
2352                                                    RCL_SERVER);
2353                         rc = rc > 0 ? 0 : rc;
2354                 } else if (!CFS_FAIL_PRECHECK(OBD_FAIL_PTLRPC_CLIENT_BULK_CB2)) {
2355                         rc = target_bulk_io(exp, desc, &lwi);
2356                 }
2357                 no_reply = rc != 0;
2358         } else {
2359                 if (body->oa.o_valid & OBD_MD_FLFLAGS &&
2360                     body->oa.o_flags & OBD_FL_SHORT_IO)
2361                         req_capsule_shrink(&req->rq_pill, &RMF_SHORT_IO, 0,
2362                                            RCL_SERVER);
2363         }
2364
2365 out_commitrw:
2366         /* Must commit after prep above in all cases */
2367         rc = obd_commitrw(tsi->tsi_env, OBD_BRW_READ, exp, &repbody->oa, 1, ioo,
2368                           remote_nb, npages, local_nb, rc);
2369 out_lock:
2370         tgt_brw_unlock(ioo, remote_nb, &lockh, LCK_PR);
2371
2372         if (desc && !CFS_FAIL_PRECHECK(OBD_FAIL_PTLRPC_CLIENT_BULK_CB2))
2373                 ptlrpc_free_bulk(desc);
2374
2375         LASSERT(rc <= 0);
2376         if (rc == 0) {
2377                 rc = nob;
2378                 ptlrpc_lprocfs_brw(req, nob);
2379         } else if (no_reply) {
2380                 req->rq_no_reply = 1;
2381                 /* reply out callback would free */
2382                 ptlrpc_req_drop_rs(req);
2383                 LCONSOLE_WARN("%s: Bulk IO read error with %s (at %s), "
2384                               "client will retry: rc %d\n",
2385                               obd_name,
2386                               obd_uuid2str(&exp->exp_client_uuid),
2387                               obd_export_nid2str(exp), rc);
2388         }
2389         /* send a bulk after reply to simulate a network delay or reordering
2390          * by a router - Note that !desc implies short io, so there is no bulk
2391          * to reorder. */
2392         if (unlikely(CFS_FAIL_PRECHECK(OBD_FAIL_PTLRPC_CLIENT_BULK_CB2)) &&
2393             desc) {
2394                 wait_queue_head_t        waitq;
2395                 struct l_wait_info       lwi1;
2396
2397                 CDEBUG(D_INFO, "reorder BULK\n");
2398                 init_waitqueue_head(&waitq);
2399
2400                 lwi1 = LWI_TIMEOUT_INTR(cfs_time_seconds(3), NULL, NULL, NULL);
2401                 l_wait_event(waitq, 0, &lwi1);
2402                 target_bulk_io(exp, desc, &lwi);
2403                 ptlrpc_free_bulk(desc);
2404         }
2405
2406         RETURN(rc);
2407 }
2408 EXPORT_SYMBOL(tgt_brw_read);
2409
2410 static int tgt_shortio2pages(struct niobuf_local *local, int npages,
2411                              unsigned char *buf, unsigned int size)
2412 {
2413         int     i, off, len;
2414         char    *ptr;
2415
2416         for (i = 0; i < npages; i++) {
2417                 off = local[i].lnb_page_offset & ~PAGE_MASK;
2418                 len = local[i].lnb_len;
2419
2420                 if (len == 0)
2421                         continue;
2422
2423                 CDEBUG(D_PAGE, "index %d offset = %d len = %d left = %d\n",
2424                        i, off, len, size);
2425                 ptr = ll_kmap_atomic(local[i].lnb_page, KM_USER0);
2426                 if (ptr == NULL)
2427                         return -EINVAL;
2428                 memcpy(ptr + off, buf, len < size ? len : size);
2429                 ll_kunmap_atomic(ptr, KM_USER0);
2430                 buf += len;
2431                 size -= len;
2432         }
2433         return 0;
2434 }
2435
2436 static void tgt_warn_on_cksum(struct ptlrpc_request *req,
2437                               struct ptlrpc_bulk_desc *desc,
2438                               struct niobuf_local *local_nb, int npages,
2439                               u32 client_cksum, u32 server_cksum,
2440                               bool mmap)
2441 {
2442         struct obd_export *exp = req->rq_export;
2443         struct ost_body *body;
2444         char *router = "";
2445         char *via = "";
2446
2447         body = req_capsule_client_get(&req->rq_pill, &RMF_OST_BODY);
2448         LASSERT(body != NULL);
2449
2450         if (desc && req->rq_peer.nid != desc->bd_sender) {
2451                 via = " via ";
2452                 router = libcfs_nid2str(desc->bd_sender);
2453         }
2454
2455         if (exp->exp_obd->obd_checksum_dump)
2456                 dump_all_bulk_pages(&body->oa, npages, local_nb, server_cksum,
2457                                     client_cksum);
2458
2459         if (mmap) {
2460                 CDEBUG_LIMIT(D_INFO, "client csum %x, server csum %x\n",
2461                              client_cksum, server_cksum);
2462                 return;
2463         }
2464
2465         LCONSOLE_ERROR_MSG(0x168, "%s: BAD WRITE CHECKSUM: from %s%s%s inode "
2466                            DFID" object "DOSTID" extent [%llu-%llu"
2467                            "]: client csum %x, server csum %x\n",
2468                            exp->exp_obd->obd_name, libcfs_id2str(req->rq_peer),
2469                            via, router,
2470                            body->oa.o_valid & OBD_MD_FLFID ?
2471                            body->oa.o_parent_seq : (__u64)0,
2472                            body->oa.o_valid & OBD_MD_FLFID ?
2473                            body->oa.o_parent_oid : 0,
2474                            body->oa.o_valid & OBD_MD_FLFID ?
2475                            body->oa.o_parent_ver : 0,
2476                            POSTID(&body->oa.o_oi),
2477                            local_nb[0].lnb_file_offset,
2478                            local_nb[npages-1].lnb_file_offset +
2479                            local_nb[npages - 1].lnb_len - 1,
2480                            client_cksum, server_cksum);
2481 }
2482
2483 int tgt_brw_write(struct tgt_session_info *tsi)
2484 {
2485         struct ptlrpc_request   *req = tgt_ses_req(tsi);
2486         struct ptlrpc_bulk_desc *desc = NULL;
2487         struct obd_export       *exp = req->rq_export;
2488         struct niobuf_remote    *remote_nb;
2489         struct niobuf_local     *local_nb;
2490         struct obd_ioobj        *ioo;
2491         struct ost_body         *body, *repbody;
2492         struct l_wait_info       lwi;
2493         struct lustre_handle     lockh = {0};
2494         __u32                   *rcs;
2495         int                      objcount, niocount, npages;
2496         int                      rc, i, j;
2497         enum cksum_types cksum_type = OBD_CKSUM_CRC32;
2498         bool                     no_reply = false, mmap;
2499         struct tgt_thread_big_cache *tbc = req->rq_svc_thread->t_data;
2500         bool wait_sync = false;
2501         const char *obd_name = exp->exp_obd->obd_name;
2502
2503         ENTRY;
2504
2505         if (ptlrpc_req2svc(req)->srv_req_portal != OST_IO_PORTAL &&
2506             ptlrpc_req2svc(req)->srv_req_portal != MDS_IO_PORTAL) {
2507                 CERROR("%s: deny write request from %s to portal %u\n",
2508                        tgt_name(tsi->tsi_tgt),
2509                        obd_export_nid2str(req->rq_export),
2510                        ptlrpc_req2svc(req)->srv_req_portal);
2511                 RETURN(err_serious(-EPROTO));
2512         }
2513
2514         if (OBD_FAIL_CHECK(OBD_FAIL_OST_ENOSPC))
2515                 RETURN(err_serious(-ENOSPC));
2516         if (OBD_FAIL_TIMEOUT(OBD_FAIL_OST_EROFS, 1))
2517                 RETURN(err_serious(-EROFS));
2518
2519         req->rq_bulk_write = 1;
2520
2521         if (OBD_FAIL_CHECK(OBD_FAIL_OST_BRW_WRITE_BULK))
2522                 RETURN(err_serious(-EIO));
2523         if (OBD_FAIL_CHECK(OBD_FAIL_OST_BRW_WRITE_BULK2))
2524                 RETURN(err_serious(-EFAULT));
2525
2526         /* pause before transaction has been started */
2527         CFS_FAIL_TIMEOUT(OBD_FAIL_OST_BRW_PAUSE_BULK, cfs_fail_val > 0 ?
2528                          cfs_fail_val : (obd_timeout + 1) / 4);
2529
2530         /* Delay write commit to show stale size information */
2531         CFS_FAIL_TIMEOUT(OBD_FAIL_OSC_NO_SIZE_DATA, cfs_fail_val);
2532
2533         /* There must be big cache in current thread to process this request
2534          * if it is NULL then something went wrong and it wasn't allocated,
2535          * report -ENOMEM in that case */
2536         if (tbc == NULL)
2537                 RETURN(-ENOMEM);
2538
2539         body = tsi->tsi_ost_body;
2540         LASSERT(body != NULL);
2541
2542         ioo = req_capsule_client_get(&req->rq_pill, &RMF_OBD_IOOBJ);
2543         LASSERT(ioo != NULL); /* must exists after tgt_ost_body_unpack */
2544
2545         objcount = req_capsule_get_size(&req->rq_pill, &RMF_OBD_IOOBJ,
2546                                         RCL_CLIENT) / sizeof(*ioo);
2547
2548         for (niocount = i = 0; i < objcount; i++)
2549                 niocount += ioo[i].ioo_bufcnt;
2550
2551         remote_nb = req_capsule_client_get(&req->rq_pill, &RMF_NIOBUF_REMOTE);
2552         LASSERT(remote_nb != NULL); /* must exists after tgt_ost_body_unpack */
2553         if (niocount != req_capsule_get_size(&req->rq_pill,
2554                                              &RMF_NIOBUF_REMOTE, RCL_CLIENT) /
2555                         sizeof(*remote_nb))
2556                 RETURN(err_serious(-EPROTO));
2557
2558         if ((remote_nb[0].rnb_flags & OBD_BRW_MEMALLOC) &&
2559             ptlrpc_connection_is_local(exp->exp_connection))
2560                 memory_pressure_set();
2561
2562         req_capsule_set_size(&req->rq_pill, &RMF_RCS, RCL_SERVER,
2563                              niocount * sizeof(*rcs));
2564         rc = req_capsule_server_pack(&req->rq_pill);
2565         if (rc != 0)
2566                 GOTO(out, rc = err_serious(rc));
2567
2568         CFS_FAIL_TIMEOUT(OBD_FAIL_OST_BRW_PAUSE_PACK, cfs_fail_val);
2569         rcs = req_capsule_server_get(&req->rq_pill, &RMF_RCS);
2570
2571         local_nb = tbc->local;
2572
2573         rc = tgt_brw_lock(tsi->tsi_env, exp, &tsi->tsi_resid, ioo, remote_nb,
2574                           &lockh, LCK_PW);
2575         if (rc != 0)
2576                 GOTO(out, rc);
2577
2578         /*
2579          * If getting the lock took more time than
2580          * client was willing to wait, drop it. b=11330
2581          */
2582         if (ktime_get_real_seconds() > req->rq_deadline ||
2583             OBD_FAIL_CHECK(OBD_FAIL_OST_DROP_REQ)) {
2584                 no_reply = true;
2585                 CERROR("%s: Dropping timed-out write from %s because locking object " DOSTID " took %lld seconds (limit was %lld).\n",
2586                        tgt_name(tsi->tsi_tgt), libcfs_id2str(req->rq_peer),
2587                        POSTID(&ioo->ioo_oid),
2588                        ktime_get_real_seconds() - req->rq_arrival_time.tv_sec,
2589                        req->rq_deadline - req->rq_arrival_time.tv_sec);
2590                 GOTO(out_lock, rc = -ETIMEDOUT);
2591         }
2592
2593         /* Because we already sync grant info with client when reconnect,
2594          * grant info will be cleared for resent req, then fed_grant and
2595          * total_grant will not be modified in following preprw_write */
2596         if (lustre_msg_get_flags(req->rq_reqmsg) & (MSG_RESENT | MSG_REPLAY)) {
2597                 DEBUG_REQ(D_CACHE, req, "clear resent/replay req grant info");
2598                 body->oa.o_valid &= ~OBD_MD_FLGRANT;
2599         }
2600
2601         repbody = req_capsule_server_get(&req->rq_pill, &RMF_OST_BODY);
2602         if (repbody == NULL)
2603                 GOTO(out_lock, rc = -ENOMEM);
2604         repbody->oa = body->oa;
2605
2606         npages = PTLRPC_MAX_BRW_PAGES;
2607         rc = obd_preprw(tsi->tsi_env, OBD_BRW_WRITE, exp, &repbody->oa,
2608                         objcount, ioo, remote_nb, &npages, local_nb);
2609         if (rc < 0)
2610                 GOTO(out_lock, rc);
2611         if (body->oa.o_valid & OBD_MD_FLFLAGS &&
2612             body->oa.o_flags & OBD_FL_SHORT_IO) {
2613                 unsigned int short_io_size;
2614                 unsigned char *short_io_buf;
2615
2616                 short_io_size = req_capsule_get_size(&req->rq_pill,
2617                                                      &RMF_SHORT_IO,
2618                                                      RCL_CLIENT);
2619                 short_io_buf = req_capsule_client_get(&req->rq_pill,
2620                                                       &RMF_SHORT_IO);
2621                 CDEBUG(D_INFO, "Client use short io for data transfer,"
2622                                " size = %d\n", short_io_size);
2623
2624                 /* Copy short io buf to pages */
2625                 rc = tgt_shortio2pages(local_nb, npages, short_io_buf,
2626                                        short_io_size);
2627                 desc = NULL;
2628         } else {
2629                 desc = ptlrpc_prep_bulk_exp(req, npages, ioobj_max_brw_get(ioo),
2630                                             PTLRPC_BULK_GET_SINK |
2631                                             PTLRPC_BULK_BUF_KIOV,
2632                                             OST_BULK_PORTAL,
2633                                             &ptlrpc_bulk_kiov_nopin_ops);
2634                 if (desc == NULL)
2635                         GOTO(skip_transfer, rc = -ENOMEM);
2636
2637                 /* NB Having prepped, we must commit... */
2638                 for (i = 0; i < npages; i++)
2639                         desc->bd_frag_ops->add_kiov_frag(desc,
2640                                         local_nb[i].lnb_page,
2641                                         local_nb[i].lnb_page_offset & ~PAGE_MASK,
2642                                         local_nb[i].lnb_len);
2643
2644                 rc = sptlrpc_svc_prep_bulk(req, desc);
2645                 if (rc != 0)
2646                         GOTO(skip_transfer, rc);
2647
2648                 rc = target_bulk_io(exp, desc, &lwi);
2649         }
2650
2651         no_reply = rc != 0;
2652
2653 skip_transfer:
2654         if (body->oa.o_valid & OBD_MD_FLCKSUM && rc == 0) {
2655                 static int cksum_counter;
2656
2657                 if (body->oa.o_valid & OBD_MD_FLFLAGS)
2658                         cksum_type = obd_cksum_type_unpack(body->oa.o_flags);
2659
2660                 repbody->oa.o_valid |= OBD_MD_FLCKSUM | OBD_MD_FLFLAGS;
2661                 repbody->oa.o_flags &= ~OBD_FL_CKSUM_ALL;
2662                 repbody->oa.o_flags |= obd_cksum_type_pack(obd_name,
2663                                                            cksum_type);
2664
2665                 rc = tgt_checksum_niobuf_rw(tsi->tsi_tgt, cksum_type,
2666                                             local_nb, npages, OST_WRITE,
2667                                             &repbody->oa.o_cksum);
2668                 if (rc < 0)
2669                         GOTO(out_commitrw, rc);
2670
2671                 cksum_counter++;
2672
2673                 if (unlikely(body->oa.o_cksum != repbody->oa.o_cksum)) {
2674                         mmap = (body->oa.o_valid & OBD_MD_FLFLAGS &&
2675                                 body->oa.o_flags & OBD_FL_MMAP);
2676
2677                         tgt_warn_on_cksum(req, desc, local_nb, npages,
2678                                           body->oa.o_cksum,
2679                                           repbody->oa.o_cksum, mmap);
2680                         cksum_counter = 0;
2681                 } else if ((cksum_counter & (-cksum_counter)) ==
2682                            cksum_counter) {
2683                         CDEBUG(D_INFO, "Checksum %u from %s OK: %x\n",
2684                                cksum_counter, libcfs_id2str(req->rq_peer),
2685                                repbody->oa.o_cksum);
2686                 }
2687         }
2688
2689 out_commitrw:
2690         /* Must commit after prep above in all cases */
2691         rc = obd_commitrw(tsi->tsi_env, OBD_BRW_WRITE, exp, &repbody->oa,
2692                           objcount, ioo, remote_nb, npages, local_nb, rc);
2693         if (rc == -ENOTCONN)
2694                 /* quota acquire process has been given up because
2695                  * either the client has been evicted or the client
2696                  * has timed out the request already */
2697                 no_reply = true;
2698
2699         for (i = 0; i < niocount; i++) {
2700                 if (!(local_nb[i].lnb_flags & OBD_BRW_ASYNC)) {
2701                         wait_sync = true;
2702                         break;
2703                 }
2704         }
2705         /*
2706          * Disable sending mtime back to the client. If the client locked the
2707          * whole object, then it has already updated the mtime on its side,
2708          * otherwise it will have to glimpse anyway (see bug 21489, comment 32)
2709          */
2710         repbody->oa.o_valid &= ~(OBD_MD_FLMTIME | OBD_MD_FLATIME);
2711
2712         if (rc == 0) {
2713                 int nob = 0;
2714
2715                 /* set per-requested niobuf return codes */
2716                 for (i = j = 0; i < niocount; i++) {
2717                         int len = remote_nb[i].rnb_len;
2718
2719                         nob += len;
2720                         rcs[i] = 0;
2721                         do {
2722                                 LASSERT(j < npages);
2723                                 if (local_nb[j].lnb_rc < 0)
2724                                         rcs[i] = local_nb[j].lnb_rc;
2725                                 len -= local_nb[j].lnb_len;
2726                                 j++;
2727                         } while (len > 0);
2728                         LASSERT(len == 0);
2729                 }
2730                 LASSERT(j == npages);
2731                 ptlrpc_lprocfs_brw(req, nob);
2732         }
2733 out_lock:
2734         tgt_brw_unlock(ioo, remote_nb, &lockh, LCK_PW);
2735         if (desc)
2736                 ptlrpc_free_bulk(desc);
2737 out:
2738         if (unlikely(no_reply || (exp->exp_obd->obd_no_transno && wait_sync))) {
2739                 req->rq_no_reply = 1;
2740                 /* reply out callback would free */
2741                 ptlrpc_req_drop_rs(req);
2742                 if (!exp->exp_obd->obd_no_transno)
2743                         LCONSOLE_WARN("%s: Bulk IO write error with %s (at %s),"
2744                                       " client will retry: rc = %d\n",
2745                                       obd_name,
2746                                       obd_uuid2str(&exp->exp_client_uuid),
2747                                       obd_export_nid2str(exp), rc);
2748         }
2749         memory_pressure_clr();
2750         RETURN(rc);
2751 }
2752 EXPORT_SYMBOL(tgt_brw_write);
2753
2754 /* Check if request can be reconstructed from saved reply data
2755  * A copy of the reply data is returned in @trd if the pointer is not NULL
2756  */
2757 bool req_can_reconstruct(struct ptlrpc_request *req,
2758                          struct tg_reply_data *trd)
2759 {
2760         struct tg_export_data *ted = &req->rq_export->exp_target_data;
2761         struct lsd_client_data *lcd = ted->ted_lcd;
2762         bool found;
2763
2764         if (tgt_is_multimodrpcs_client(req->rq_export))
2765                 return tgt_lookup_reply(req, trd);
2766
2767         mutex_lock(&ted->ted_lcd_lock);
2768         found = req->rq_xid == lcd->lcd_last_xid ||
2769                 req->rq_xid == lcd->lcd_last_close_xid;
2770
2771         if (found && trd != NULL) {
2772                 if (lustre_msg_get_opc(req->rq_reqmsg) == MDS_CLOSE) {
2773                         trd->trd_reply.lrd_xid = lcd->lcd_last_close_xid;
2774                         trd->trd_reply.lrd_transno =
2775                                                 lcd->lcd_last_close_transno;
2776                         trd->trd_reply.lrd_result = lcd->lcd_last_close_result;
2777                 } else {
2778                         trd->trd_reply.lrd_xid = lcd->lcd_last_xid;
2779                         trd->trd_reply.lrd_transno = lcd->lcd_last_transno;
2780                         trd->trd_reply.lrd_result = lcd->lcd_last_result;
2781                         trd->trd_reply.lrd_data = lcd->lcd_last_data;
2782                         trd->trd_pre_versions[0] = lcd->lcd_pre_versions[0];
2783                         trd->trd_pre_versions[1] = lcd->lcd_pre_versions[1];
2784                         trd->trd_pre_versions[2] = lcd->lcd_pre_versions[2];
2785                         trd->trd_pre_versions[3] = lcd->lcd_pre_versions[3];
2786                 }
2787         }
2788         mutex_unlock(&ted->ted_lcd_lock);
2789
2790         return found;
2791 }
2792 EXPORT_SYMBOL(req_can_reconstruct);
2793