lustre/mdc/mdc_request.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, see
  18  * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
  19  *
  20  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  21  * CA 95054 USA or visit www.sun.com if you need additional information or
  22  * have any questions.
  23  *
  24  * GPL HEADER END
  25  */
  26 /*
  27  * Copyright (c) 2001, 2010, Oracle and/or its affiliates. All rights reserved.
  28  * Use is subject to license terms.
  29  *
  30  * Copyright (c) 2011, 2014, Intel Corporation.
  31  */
  32 /*
  33  * This file is part of Lustre, http://www.lustre.org/
  34  * Lustre is a trademark of Sun Microsystems, Inc.
  35  */
  36
  37 #define DEBUG_SUBSYSTEM S_MDC
  38
  39 #include <linux/module.h>
  40 #include <linux/pagemap.h>
  41 #include <linux/miscdevice.h>
  42 #include <linux/init.h>
  43 #include <linux/utsname.h>
  44 #include <linux/kthread.h>
  45 #include <linux/user_namespace.h>
  46 #ifdef HAVE_UIDGID_HEADER
  47 # include <linux/uidgid.h>
  48 #endif
  49
  50 #include <lustre_acl.h>
  51 #include <lustre_ioctl.h>
  52 #include <obd_class.h>
  53 #include <lustre_lmv.h>
  54 #include <lustre_fid.h>
  55 #include <lprocfs_status.h>
  56 #include <lustre_param.h>
  57 #include <lustre_log.h>
  58 #include <lustre_kernelcomm.h>
  59 #include <cl_object.h>
  60
  61 #include "mdc_internal.h"
  62
  63 #define REQUEST_MINOR 244
  64
  65 struct mdc_renew_capa_args {
  66         struct obd_capa        *ra_oc;
  67         renew_capa_cb_t         ra_cb;
  68 };
  69
  70 static int mdc_cleanup(struct obd_device *obd);
  71
  72 static int mdc_unpack_capa(struct obd_export *exp, struct ptlrpc_request *req,
  73                            const struct req_msg_field *field,
  74                            struct obd_capa **oc)
  75 {
  76         struct lustre_capa *capa;
  77         struct obd_capa *c;
  78         ENTRY;
  79
  80         /* swabbed already in mdc_enqueue */
  81         capa = req_capsule_server_get(&req->rq_pill, field);
  82         if (capa == NULL)
  83                 RETURN(-EPROTO);
  84
  85         c = alloc_capa(CAPA_SITE_CLIENT);
  86         if (IS_ERR(c)) {
  87                 CDEBUG(D_INFO, "alloc capa failed!\n");
  88                 RETURN(PTR_ERR(c));
  89         } else {
  90                 c->c_capa = *capa;
  91                 *oc = c;
  92                 RETURN(0);
  93         }
  94 }
  95
  96 static inline int mdc_queue_wait(struct ptlrpc_request *req)
  97 {
  98         struct client_obd *cli = &req->rq_import->imp_obd->u.cli;
  99         int rc;
 100
 101         /* obd_get_request_slot() ensures that this client has no more
 102          * than cl_max_rpcs_in_flight RPCs simultaneously inf light
 103          * against an MDT. */
 104         rc = obd_get_request_slot(cli);
 105         if (rc != 0)
 106                 return rc;
 107
 108         rc = ptlrpc_queue_wait(req);
 109         obd_put_request_slot(cli);
 110
 111         return rc;
 112 }
 113
 114 /* Helper that implements most of mdc_getstatus and signal_completed_replay. */
 115 /* XXX this should become mdc_get_info("key"), sending MDS_GET_INFO RPC */
 116 static int send_getstatus(struct obd_import *imp, struct lu_fid *rootfid,
 117                           struct obd_capa **pc, int level, int msg_flags)
 118 {
 119         struct ptlrpc_request *req;
 120         struct mdt_body       *body;
 121         int                    rc;
 122         ENTRY;
 123
 124         req = ptlrpc_request_alloc_pack(imp, &RQF_MDS_GETSTATUS,
 125                                         LUSTRE_MDS_VERSION, MDS_GETSTATUS);
 126         if (req == NULL)
 127                 RETURN(-ENOMEM);
 128
 129         mdc_pack_body(req, NULL, NULL, 0, 0, -1, 0);
 130         lustre_msg_add_flags(req->rq_reqmsg, msg_flags);
 131         req->rq_send_state = level;
 132
 133         ptlrpc_request_set_replen(req);
 134
 135         rc = ptlrpc_queue_wait(req);
 136         if (rc)
 137                 GOTO(out, rc);
 138
 139         body = req_capsule_server_get(&req->rq_pill, &RMF_MDT_BODY);
 140         if (body == NULL)
 141                 GOTO(out, rc = -EPROTO);
 142
 143         if (body->mbo_valid & OBD_MD_FLMDSCAPA) {
 144                 rc = mdc_unpack_capa(NULL, req, &RMF_CAPA1, pc);
 145                 if (rc)
 146                         GOTO(out, rc);
 147         }
 148
 149         *rootfid = body->mbo_fid1;
 150         CDEBUG(D_NET, "root fid="DFID", last_committed="LPU64"\n",
 151                PFID(rootfid), lustre_msg_get_last_committed(req->rq_repmsg));
 152         EXIT;
 153 out:
 154         ptlrpc_req_finished(req);
 155         return rc;
 156 }
 157
 158 /* This should be mdc_get_info("rootfid") */
 159 static int mdc_getstatus(struct obd_export *exp, struct lu_fid *rootfid,
 160                          struct obd_capa **pc)
 161 {
 162         return send_getstatus(class_exp2cliimp(exp), rootfid, pc,
 163                               LUSTRE_IMP_FULL, 0);
 164 }
 165
 166 /*
 167  * This function now is known to always saying that it will receive 4 buffers
 168  * from server. Even for cases when acl_size and md_size is zero, RPC header
 169  * will contain 4 fields and RPC itself will contain zero size fields. This is
 170  * because mdt_getattr*() _always_ returns 4 fields, but if acl is not needed
 171  * and thus zero, it shrinks it, making zero size. The same story about
 172  * md_size. And this is course of problem when client waits for smaller number
 173  * of fields. This issue will be fixed later when client gets aware of RPC
 174  * layouts.  --umka
 175  */
 176 static int mdc_getattr_common(struct obd_export *exp,
 177                               struct ptlrpc_request *req)
 178 {
 179         struct req_capsule *pill = &req->rq_pill;
 180         struct mdt_body    *body;
 181         void               *eadata;
 182         int                 rc;
 183         ENTRY;
 184
 185         /* Request message already built. */
 186         rc = ptlrpc_queue_wait(req);
 187         if (rc != 0)
 188                 RETURN(rc);
 189
 190         /* sanity check for the reply */
 191         body = req_capsule_server_get(pill, &RMF_MDT_BODY);
 192         if (body == NULL)
 193                 RETURN(-EPROTO);
 194
 195         CDEBUG(D_NET, "mode: %o\n", body->mbo_mode);
 196
 197         mdc_update_max_ea_from_body(exp, body);
 198         if (body->mbo_eadatasize != 0) {
 199                 eadata = req_capsule_server_sized_get(pill, &RMF_MDT_MD,
 200                                                       body->mbo_eadatasize);
 201                 if (eadata == NULL)
 202                         RETURN(-EPROTO);
 203         }
 204
 205         if (body->mbo_valid & OBD_MD_FLRMTPERM) {
 206                 struct mdt_remote_perm *perm;
 207
 208                 LASSERT(client_is_remote(exp));
 209                 perm = req_capsule_server_swab_get(pill, &RMF_ACL,
 210                                                 lustre_swab_mdt_remote_perm);
 211                 if (perm == NULL)
 212                         RETURN(-EPROTO);
 213         }
 214
 215         if (body->mbo_valid & OBD_MD_FLMDSCAPA) {
 216                 struct lustre_capa *capa;
 217                 capa = req_capsule_server_get(pill, &RMF_CAPA1);
 218                 if (capa == NULL)
 219                         RETURN(-EPROTO);
 220         }
 221
 222         RETURN(0);
 223 }
 224
 225 static int mdc_getattr(struct obd_export *exp, struct md_op_data *op_data,
 226                        struct ptlrpc_request **request)
 227 {
 228         struct ptlrpc_request *req;
 229         int                    rc;
 230         ENTRY;
 231
 232         /* Single MDS without an LMV case */
 233         if (op_data->op_flags & MF_GET_MDT_IDX) {
 234                 op_data->op_mds = 0;
 235                 RETURN(0);
 236         }
 237         *request = NULL;
 238         req = ptlrpc_request_alloc(class_exp2cliimp(exp), &RQF_MDS_GETATTR);
 239         if (req == NULL)
 240                 RETURN(-ENOMEM);
 241
 242         mdc_set_capa_size(req, &RMF_CAPA1, op_data->op_capa1);
 243
 244         rc = ptlrpc_request_pack(req, LUSTRE_MDS_VERSION, MDS_GETATTR);
 245         if (rc) {
 246                 ptlrpc_request_free(req);
 247                 RETURN(rc);
 248         }
 249
 250         mdc_pack_body(req, &op_data->op_fid1, op_data->op_capa1,
 251                       op_data->op_valid, op_data->op_mode, -1, 0);
 252
 253         req_capsule_set_size(&req->rq_pill, &RMF_MDT_MD, RCL_SERVER,
 254                              op_data->op_mode);
 255         if (op_data->op_valid & OBD_MD_FLRMTPERM) {
 256                 LASSERT(client_is_remote(exp));
 257                 req_capsule_set_size(&req->rq_pill, &RMF_ACL, RCL_SERVER,
 258                                      sizeof(struct mdt_remote_perm));
 259         }
 260         ptlrpc_request_set_replen(req);
 261
 262         rc = mdc_getattr_common(exp, req);
 263         if (rc)
 264                 ptlrpc_req_finished(req);
 265         else
 266                 *request = req;
 267         RETURN(rc);
 268 }
 269
 270 static int mdc_getattr_name(struct obd_export *exp, struct md_op_data *op_data,
 271                             struct ptlrpc_request **request)
 272 {
 273         struct ptlrpc_request *req;
 274         int                    rc;
 275         ENTRY;
 276
 277         *request = NULL;
 278         req = ptlrpc_request_alloc(class_exp2cliimp(exp),
 279                                    &RQF_MDS_GETATTR_NAME);
 280         if (req == NULL)
 281                 RETURN(-ENOMEM);
 282
 283         mdc_set_capa_size(req, &RMF_CAPA1, op_data->op_capa1);
 284         req_capsule_set_size(&req->rq_pill, &RMF_NAME, RCL_CLIENT,
 285                              op_data->op_namelen + 1);
 286
 287         rc = ptlrpc_request_pack(req, LUSTRE_MDS_VERSION, MDS_GETATTR_NAME);
 288         if (rc) {
 289                 ptlrpc_request_free(req);
 290                 RETURN(rc);
 291         }
 292
 293         mdc_pack_body(req, &op_data->op_fid1, op_data->op_capa1,
 294                       op_data->op_valid, op_data->op_mode,
 295                       op_data->op_suppgids[0], 0);
 296
 297         if (op_data->op_name) {
 298                 char *name = req_capsule_client_get(&req->rq_pill, &RMF_NAME);
 299                 LASSERT(strnlen(op_data->op_name, op_data->op_namelen) ==
 300                                 op_data->op_namelen);
 301                 memcpy(name, op_data->op_name, op_data->op_namelen);
 302         }
 303
 304         req_capsule_set_size(&req->rq_pill, &RMF_MDT_MD, RCL_SERVER,
 305                              op_data->op_mode);
 306         ptlrpc_request_set_replen(req);
 307
 308         rc = mdc_getattr_common(exp, req);
 309         if (rc)
 310                 ptlrpc_req_finished(req);
 311         else
 312                 *request = req;
 313         RETURN(rc);
 314 }
 315
 316 static int mdc_xattr_common(struct obd_export *exp,const struct req_format *fmt,
 317                             const struct lu_fid *fid,
 318                             struct obd_capa *oc, int opcode, u64 valid,
 319                             const char *xattr_name, const char *input,
 320                             int input_size, int output_size, int flags,
 321                             __u32 suppgid, struct ptlrpc_request **request)
 322 {
 323         struct ptlrpc_request *req;
 324         int   xattr_namelen = 0;
 325         char *tmp;
 326         int   rc;
 327         ENTRY;
 328
 329         *request = NULL;
 330         req = ptlrpc_request_alloc(class_exp2cliimp(exp), fmt);
 331         if (req == NULL)
 332                 RETURN(-ENOMEM);
 333
 334         mdc_set_capa_size(req, &RMF_CAPA1, oc);
 335         if (xattr_name) {
 336                 xattr_namelen = strlen(xattr_name) + 1;
 337                 req_capsule_set_size(&req->rq_pill, &RMF_NAME, RCL_CLIENT,
 338                                      xattr_namelen);
 339         }
 340         if (input_size) {
 341                 LASSERT(input);
 342                 req_capsule_set_size(&req->rq_pill, &RMF_EADATA, RCL_CLIENT,
 343                                      input_size);
 344         }
 345
 346         /* Flush local XATTR locks to get rid of a possible cancel RPC */
 347         if (opcode == MDS_REINT && fid_is_sane(fid) &&
 348             exp->exp_connect_data.ocd_ibits_known & MDS_INODELOCK_XATTR) {
 349                 struct list_head cancels = LIST_HEAD_INIT(cancels);
 350                 int count;
 351
 352                 /* Without that packing would fail */
 353                 if (input_size == 0)
 354                         req_capsule_set_size(&req->rq_pill, &RMF_EADATA,
 355                                              RCL_CLIENT, 0);
 356
 357                 count = mdc_resource_get_unused(exp, fid,
 358                                                 &cancels, LCK_EX,
 359                                                 MDS_INODELOCK_XATTR);
 360
 361                 rc = mdc_prep_elc_req(exp, req, MDS_REINT, &cancels, count);
 362                 if (rc) {
 363                         ptlrpc_request_free(req);
 364                         RETURN(rc);
 365                 }
 366         } else {
 367                 rc = ptlrpc_request_pack(req, LUSTRE_MDS_VERSION, opcode);
 368                 if (rc) {
 369                         ptlrpc_request_free(req);
 370                         RETURN(rc);
 371                 }
 372         }
 373
 374         if (opcode == MDS_REINT) {
 375                 struct mdt_rec_setxattr *rec;
 376
 377                 CLASSERT(sizeof(struct mdt_rec_setxattr) ==
 378                          sizeof(struct mdt_rec_reint));
 379                 rec = req_capsule_client_get(&req->rq_pill, &RMF_REC_REINT);
 380                 rec->sx_opcode = REINT_SETXATTR;
 381                 rec->sx_fsuid  = from_kuid(&init_user_ns, current_fsuid());
 382                 rec->sx_fsgid  = from_kgid(&init_user_ns, current_fsgid());
 383                 rec->sx_cap    = cfs_curproc_cap_pack();
 384                 rec->sx_suppgid1 = suppgid;
 385                 rec->sx_suppgid2 = -1;
 386                 rec->sx_fid    = *fid;
 387                 rec->sx_valid  = valid | OBD_MD_FLCTIME;
 388                 rec->sx_time   = cfs_time_current_sec();
 389                 rec->sx_size   = output_size;
 390                 rec->sx_flags  = flags;
 391
 392                 mdc_pack_capa(req, &RMF_CAPA1, oc);
 393         } else {
 394                 mdc_pack_body(req, fid, oc, valid, output_size, suppgid, flags);
 395         }
 396
 397         if (xattr_name) {
 398                 tmp = req_capsule_client_get(&req->rq_pill, &RMF_NAME);
 399                 memcpy(tmp, xattr_name, xattr_namelen);
 400         }
 401         if (input_size) {
 402                 tmp = req_capsule_client_get(&req->rq_pill, &RMF_EADATA);
 403                 memcpy(tmp, input, input_size);
 404         }
 405
 406         if (req_capsule_has_field(&req->rq_pill, &RMF_EADATA, RCL_SERVER))
 407                 req_capsule_set_size(&req->rq_pill, &RMF_EADATA,
 408                                      RCL_SERVER, output_size);
 409         ptlrpc_request_set_replen(req);
 410
 411         /* make rpc */
 412         if (opcode == MDS_REINT)
 413                 mdc_get_rpc_lock(exp->exp_obd->u.cli.cl_rpc_lock, NULL);
 414
 415         rc = ptlrpc_queue_wait(req);
 416
 417         if (opcode == MDS_REINT)
 418                 mdc_put_rpc_lock(exp->exp_obd->u.cli.cl_rpc_lock, NULL);
 419
 420         if (rc)
 421                 ptlrpc_req_finished(req);
 422         else
 423                 *request = req;
 424         RETURN(rc);
 425 }
 426
 427 static int mdc_setxattr(struct obd_export *exp, const struct lu_fid *fid,
 428                         struct obd_capa *oc, u64 valid,
 429                         const char *xattr_name,
 430                         const char *input, int input_size, int output_size,
 431                         int flags, __u32 suppgid,
 432                         struct ptlrpc_request **request)
 433 {
 434         return mdc_xattr_common(exp, &RQF_MDS_REINT_SETXATTR,
 435                                 fid, oc, MDS_REINT, valid, xattr_name,
 436                                 input, input_size, output_size, flags,
 437                                 suppgid, request);
 438 }
 439
 440 static int mdc_getxattr(struct obd_export *exp, const struct lu_fid *fid,
 441                         struct obd_capa *oc, u64 valid,
 442                         const char *xattr_name,
 443                         const char *input, int input_size, int output_size,
 444                         int flags, struct ptlrpc_request **request)
 445 {
 446         return mdc_xattr_common(exp, &RQF_MDS_GETXATTR,
 447                                 fid, oc, MDS_GETXATTR, valid, xattr_name,
 448                                 input, input_size, output_size, flags,
 449                                 -1, request);
 450 }
 451
 452 #ifdef CONFIG_FS_POSIX_ACL
 453 static int mdc_unpack_acl(struct ptlrpc_request *req, struct lustre_md *md)
 454 {
 455         struct req_capsule     *pill = &req->rq_pill;
 456         struct mdt_body        *body = md->body;
 457         struct posix_acl       *acl;
 458         void                   *buf;
 459         int                     rc;
 460         ENTRY;
 461
 462         if (!body->mbo_aclsize)
 463                 RETURN(0);
 464
 465         buf = req_capsule_server_sized_get(pill, &RMF_ACL, body->mbo_aclsize);
 466
 467         if (!buf)
 468                 RETURN(-EPROTO);
 469
 470         acl = posix_acl_from_xattr(&init_user_ns, buf, body->mbo_aclsize);
 471         if (acl == NULL)
 472                 RETURN(0);
 473         if (IS_ERR(acl)) {
 474                 rc = PTR_ERR(acl);
 475                 CERROR("convert xattr to acl: %d\n", rc);
 476                 RETURN(rc);
 477         }
 478
 479         rc = posix_acl_valid(acl);
 480         if (rc) {
 481                 CERROR("validate acl: %d\n", rc);
 482                 posix_acl_release(acl);
 483                 RETURN(rc);
 484         }
 485
 486         md->posix_acl = acl;
 487         RETURN(0);
 488 }
 489 #else
 490 #define mdc_unpack_acl(req, md) 0
 491 #endif
 492
 493 int mdc_get_lustre_md(struct obd_export *exp, struct ptlrpc_request *req,
 494                       struct obd_export *dt_exp, struct obd_export *md_exp,
 495                       struct lustre_md *md)
 496 {
 497         struct req_capsule *pill = &req->rq_pill;
 498         int rc;
 499         ENTRY;
 500
 501         LASSERT(md);
 502         memset(md, 0, sizeof(*md));
 503
 504         md->body = req_capsule_server_get(pill, &RMF_MDT_BODY);
 505         LASSERT(md->body != NULL);
 506
 507         if (md->body->mbo_valid & OBD_MD_FLEASIZE) {
 508                 int lmmsize;
 509                 struct lov_mds_md *lmm;
 510
 511                 if (!S_ISREG(md->body->mbo_mode)) {
 512                         CDEBUG(D_INFO, "OBD_MD_FLEASIZE set, should be a "
 513                                "regular file, but is not\n");
 514                         GOTO(out, rc = -EPROTO);
 515                 }
 516
 517                 if (md->body->mbo_eadatasize == 0) {
 518                         CDEBUG(D_INFO, "OBD_MD_FLEASIZE set, "
 519                                "but eadatasize 0\n");
 520                         GOTO(out, rc = -EPROTO);
 521                 }
 522
 523                 lmmsize = md->body->mbo_eadatasize;
 524                 lmm = req_capsule_server_sized_get(pill, &RMF_MDT_MD, lmmsize);
 525                 if (!lmm)
 526                         GOTO(out, rc = -EPROTO);
 527
 528                 rc = obd_unpackmd(dt_exp, &md->lsm, lmm, lmmsize);
 529                 if (rc < 0)
 530                         GOTO(out, rc);
 531         } else if (md->body->mbo_valid & OBD_MD_FLDIREA) {
 532                 int lmvsize;
 533                 struct lov_mds_md *lmv;
 534
 535                 if (!S_ISDIR(md->body->mbo_mode)) {
 536                         CDEBUG(D_INFO, "OBD_MD_FLDIREA set, should be a "
 537                                "directory, but is not\n");
 538                         GOTO(out, rc = -EPROTO);
 539                 }
 540
 541                 if (md->body->mbo_eadatasize == 0) {
 542                         CDEBUG(D_INFO, "OBD_MD_FLDIREA is set, "
 543                                "but eadatasize 0\n");
 544                         RETURN(-EPROTO);
 545                 }
 546
 547                 if (md->body->mbo_valid & OBD_MD_MEA) {
 548                         lmvsize = md->body->mbo_eadatasize;
 549                         lmv = req_capsule_server_sized_get(pill, &RMF_MDT_MD,
 550                                                            lmvsize);
 551                         if (!lmv)
 552                                 GOTO(out, rc = -EPROTO);
 553
 554                         rc = obd_unpackmd(md_exp, (void *)&md->lmv, lmv,
 555                                           lmvsize);
 556                         if (rc < 0)
 557                                 GOTO(out, rc);
 558
 559                         if (rc < (typeof(rc))sizeof(*md->lmv)) {
 560                                 CDEBUG(D_INFO, "size too small:  "
 561                                        "rc < sizeof(*md->lmv) (%d < %d)\n",
 562                                         rc, (int)sizeof(*md->lmv));
 563                                 GOTO(out, rc = -EPROTO);
 564                         }
 565                 }
 566         }
 567         rc = 0;
 568
 569         if (md->body->mbo_valid & OBD_MD_FLRMTPERM) {
 570                 /* remote permission */
 571                 LASSERT(client_is_remote(exp));
 572                 md->remote_perm = req_capsule_server_swab_get(pill, &RMF_ACL,
 573                                                 lustre_swab_mdt_remote_perm);
 574                 if (!md->remote_perm)
 575                         GOTO(out, rc = -EPROTO);
 576         } else if (md->body->mbo_valid & OBD_MD_FLACL) {
 577                 /* for ACL, it's possible that FLACL is set but aclsize is zero.
 578                  * only when aclsize != 0 there's an actual segment for ACL
 579                  * in reply buffer.
 580                  */
 581                 if (md->body->mbo_aclsize) {
 582                         rc = mdc_unpack_acl(req, md);
 583                         if (rc)
 584                                 GOTO(out, rc);
 585 #ifdef CONFIG_FS_POSIX_ACL
 586                 } else {
 587                         md->posix_acl = NULL;
 588 #endif
 589                 }
 590         }
 591         if (md->body->mbo_valid & OBD_MD_FLMDSCAPA) {
 592                 struct obd_capa *oc = NULL;
 593
 594                 rc = mdc_unpack_capa(NULL, req, &RMF_CAPA1, &oc);
 595                 if (rc)
 596                         GOTO(out, rc);
 597                 md->mds_capa = oc;
 598         }
 599
 600         if (md->body->mbo_valid & OBD_MD_FLOSSCAPA) {
 601                 struct obd_capa *oc = NULL;
 602
 603                 rc = mdc_unpack_capa(NULL, req, &RMF_CAPA2, &oc);
 604                 if (rc)
 605                         GOTO(out, rc);
 606                 md->oss_capa = oc;
 607         }
 608
 609         EXIT;
 610 out:
 611         if (rc) {
 612                 if (md->oss_capa) {
 613                         capa_put(md->oss_capa);
 614                         md->oss_capa = NULL;
 615                 }
 616                 if (md->mds_capa) {
 617                         capa_put(md->mds_capa);
 618                         md->mds_capa = NULL;
 619                 }
 620 #ifdef CONFIG_FS_POSIX_ACL
 621                 posix_acl_release(md->posix_acl);
 622 #endif
 623                 if (md->lsm)
 624                         obd_free_memmd(dt_exp, &md->lsm);
 625         }
 626         return rc;
 627 }
 628
 629 int mdc_free_lustre_md(struct obd_export *exp, struct lustre_md *md)
 630 {
 631         ENTRY;
 632         RETURN(0);
 633 }
 634
 635 void mdc_replay_open(struct ptlrpc_request *req)
 636 {
 637         struct md_open_data *mod = req->rq_cb_data;
 638         struct ptlrpc_request *close_req;
 639         struct obd_client_handle *och;
 640         struct lustre_handle old;
 641         struct mdt_body *body;
 642         ENTRY;
 643
 644         if (mod == NULL) {
 645                 DEBUG_REQ(D_ERROR, req,
 646                           "Can't properly replay without open data.");
 647                 EXIT;
 648                 return;
 649         }
 650
 651         body = req_capsule_server_get(&req->rq_pill, &RMF_MDT_BODY);
 652         LASSERT(body != NULL);
 653
 654         och = mod->mod_och;
 655         if (och != NULL) {
 656                 struct lustre_handle *file_fh;
 657
 658                 LASSERT(och->och_magic == OBD_CLIENT_HANDLE_MAGIC);
 659
 660                 file_fh = &och->och_fh;
 661                 CDEBUG(D_HA, "updating handle from "LPX64" to "LPX64"\n",
 662                        file_fh->cookie, body->mbo_handle.cookie);
 663                 old = *file_fh;
 664                 *file_fh = body->mbo_handle;
 665         }
 666         close_req = mod->mod_close_req;
 667         if (close_req != NULL) {
 668                 __u32 opc = lustre_msg_get_opc(close_req->rq_reqmsg);
 669                 struct mdt_ioepoch *epoch;
 670
 671                 LASSERT(opc == MDS_CLOSE);
 672                 epoch = req_capsule_client_get(&close_req->rq_pill,
 673                                                &RMF_MDT_EPOCH);
 674                 LASSERT(epoch);
 675
 676                 if (och != NULL)
 677                         LASSERT(!memcmp(&old, &epoch->mio_handle, sizeof(old)));
 678
 679                 DEBUG_REQ(D_HA, close_req, "updating close body with new fh");
 680                 epoch->mio_handle = body->mbo_handle;
 681         }
 682         EXIT;
 683 }
 684
 685 void mdc_commit_open(struct ptlrpc_request *req)
 686 {
 687         struct md_open_data *mod = req->rq_cb_data;
 688         if (mod == NULL)
 689                 return;
 690
 691         /**
 692          * No need to touch md_open_data::mod_och, it holds a reference on
 693          * \var mod and will zero references to each other, \var mod will be
 694          * freed after that when md_open_data::mod_och will put the reference.
 695          */
 696
 697         /**
 698          * Do not let open request to disappear as it still may be needed
 699          * for close rpc to happen (it may happen on evict only, otherwise
 700          * ptlrpc_request::rq_replay does not let mdc_commit_open() to be
 701          * called), just mark this rpc as committed to distinguish these 2
 702          * cases, see mdc_close() for details. The open request reference will
 703          * be put along with freeing \var mod.
 704          */
 705         ptlrpc_request_addref(req);
 706         spin_lock(&req->rq_lock);
 707         req->rq_committed = 1;
 708         spin_unlock(&req->rq_lock);
 709         req->rq_cb_data = NULL;
 710         obd_mod_put(mod);
 711 }
 712
 713 int mdc_set_open_replay_data(struct obd_export *exp,
 714                              struct obd_client_handle *och,
 715                              struct lookup_intent *it)
 716 {
 717         struct md_open_data     *mod;
 718         struct mdt_rec_create   *rec;
 719         struct mdt_body         *body;
 720         struct ptlrpc_request   *open_req = it->d.lustre.it_data;
 721         struct obd_import       *imp = open_req->rq_import;
 722         ENTRY;
 723
 724         if (!open_req->rq_replay)
 725                 RETURN(0);
 726
 727         rec = req_capsule_client_get(&open_req->rq_pill, &RMF_REC_REINT);
 728         body = req_capsule_server_get(&open_req->rq_pill, &RMF_MDT_BODY);
 729         LASSERT(rec != NULL);
 730         /* Incoming message in my byte order (it's been swabbed). */
 731         /* Outgoing messages always in my byte order. */
 732         LASSERT(body != NULL);
 733
 734         /* Only if the import is replayable, we set replay_open data */
 735         if (och && imp->imp_replayable) {
 736                 mod = obd_mod_alloc();
 737                 if (mod == NULL) {
 738                         DEBUG_REQ(D_ERROR, open_req,
 739                                   "Can't allocate md_open_data");
 740                         RETURN(0);
 741                 }
 742
 743                 /**
 744                  * Take a reference on \var mod, to be freed on mdc_close().
 745                  * It protects \var mod from being freed on eviction (commit
 746                  * callback is called despite rq_replay flag).
 747                  * Another reference for \var och.
 748                  */
 749                 obd_mod_get(mod);
 750                 obd_mod_get(mod);
 751
 752                 spin_lock(&open_req->rq_lock);
 753                 och->och_mod = mod;
 754                 mod->mod_och = och;
 755                 mod->mod_is_create = it_disposition(it, DISP_OPEN_CREATE) ||
 756                                      it_disposition(it, DISP_OPEN_STRIPE);
 757                 mod->mod_open_req = open_req;
 758                 open_req->rq_cb_data = mod;
 759                 open_req->rq_commit_cb = mdc_commit_open;
 760                 spin_unlock(&open_req->rq_lock);
 761         }
 762
 763         rec->cr_fid2 = body->mbo_fid1;
 764         rec->cr_ioepoch = body->mbo_ioepoch;
 765         rec->cr_old_handle.cookie = body->mbo_handle.cookie;
 766         open_req->rq_replay_cb = mdc_replay_open;
 767         if (!fid_is_sane(&body->mbo_fid1)) {
 768                 DEBUG_REQ(D_ERROR, open_req, "Saving replay request with "
 769                           "insane fid");
 770                 LBUG();
 771         }
 772
 773         DEBUG_REQ(D_RPCTRACE, open_req, "Set up open replay data");
 774         RETURN(0);
 775 }
 776
 777 static void mdc_free_open(struct md_open_data *mod)
 778 {
 779         int committed = 0;
 780
 781         if (mod->mod_is_create == 0 &&
 782             imp_connect_disp_stripe(mod->mod_open_req->rq_import))
 783                 committed = 1;
 784
 785         LASSERT(mod->mod_open_req->rq_replay == 0);
 786
 787         DEBUG_REQ(D_RPCTRACE, mod->mod_open_req, "free open request\n");
 788
 789         ptlrpc_request_committed(mod->mod_open_req, committed);
 790         if (mod->mod_close_req)
 791                 ptlrpc_request_committed(mod->mod_close_req, committed);
 792 }
 793
 794 int mdc_clear_open_replay_data(struct obd_export *exp,
 795                                struct obd_client_handle *och)
 796 {
 797         struct md_open_data *mod = och->och_mod;
 798         ENTRY;
 799
 800         /**
 801          * It is possible to not have \var mod in a case of eviction between
 802          * lookup and ll_file_open().
 803          **/
 804         if (mod == NULL)
 805                 RETURN(0);
 806
 807         LASSERT(mod != LP_POISON);
 808         LASSERT(mod->mod_open_req != NULL);
 809         mdc_free_open(mod);
 810
 811         mod->mod_och = NULL;
 812         och->och_mod = NULL;
 813         obd_mod_put(mod);
 814
 815         RETURN(0);
 816 }
 817
 818 static int mdc_close(struct obd_export *exp, struct md_op_data *op_data,
 819                      struct md_open_data *mod, struct ptlrpc_request **request)
 820 {
 821         struct obd_device     *obd = class_exp2obd(exp);
 822         struct ptlrpc_request *req;
 823         struct req_format     *req_fmt;
 824         int                    rc;
 825         int                    saved_rc = 0;
 826         ENTRY;
 827
 828         if (op_data->op_bias & MDS_HSM_RELEASE) {
 829                 req_fmt = &RQF_MDS_INTENT_CLOSE;
 830
 831                 /* allocate a FID for volatile file */
 832                 rc = mdc_fid_alloc(NULL, exp, &op_data->op_fid2, op_data);
 833                 if (rc < 0) {
 834                         CERROR("%s: "DFID" failed to allocate FID: %d\n",
 835                                obd->obd_name, PFID(&op_data->op_fid1), rc);
 836                         /* save the errcode and proceed to close */
 837                         saved_rc = rc;
 838                 }
 839         } else if (op_data->op_bias & MDS_CLOSE_LAYOUT_SWAP) {
 840                 req_fmt = &RQF_MDS_INTENT_CLOSE;
 841         } else {
 842                 req_fmt = &RQF_MDS_CLOSE;
 843         }
 844
 845         *request = NULL;
 846         req = ptlrpc_request_alloc(class_exp2cliimp(exp), req_fmt);
 847         if (req == NULL)
 848                 RETURN(-ENOMEM);
 849
 850         mdc_set_capa_size(req, &RMF_CAPA1, op_data->op_capa1);
 851
 852         rc = ptlrpc_request_pack(req, LUSTRE_MDS_VERSION, MDS_CLOSE);
 853         if (rc) {
 854                 ptlrpc_request_free(req);
 855                 RETURN(rc);
 856         }
 857
 858         /* To avoid a livelock (bug 7034), we need to send CLOSE RPCs to a
 859          * portal whose threads are not taking any DLM locks and are therefore
 860          * always progressing */
 861         req->rq_request_portal = MDS_READPAGE_PORTAL;
 862         ptlrpc_at_set_req_timeout(req);
 863
 864         /* Ensure that this close's handle is fixed up during replay. */
 865         if (likely(mod != NULL)) {
 866                 LASSERTF(mod->mod_open_req != NULL &&
 867                          mod->mod_open_req->rq_type != LI_POISON,
 868                          "POISONED open %p!\n", mod->mod_open_req);
 869
 870                 mod->mod_close_req = req;
 871
 872                 DEBUG_REQ(D_HA, mod->mod_open_req, "matched open");
 873                 /* We no longer want to preserve this open for replay even
 874                  * though the open was committed. b=3632, b=3633 */
 875                 spin_lock(&mod->mod_open_req->rq_lock);
 876                 mod->mod_open_req->rq_replay = 0;
 877                 spin_unlock(&mod->mod_open_req->rq_lock);
 878         } else {
 879                  CDEBUG(D_HA, "couldn't find open req; expecting close error\n");
 880         }
 881
 882         mdc_close_pack(req, op_data);
 883
 884         req_capsule_set_size(&req->rq_pill, &RMF_MDT_MD, RCL_SERVER,
 885                              obd->u.cli.cl_default_mds_easize);
 886
 887         ptlrpc_request_set_replen(req);
 888
 889         mdc_get_rpc_lock(obd->u.cli.cl_close_lock, NULL);
 890         rc = ptlrpc_queue_wait(req);
 891         mdc_put_rpc_lock(obd->u.cli.cl_close_lock, NULL);
 892
 893         if (req->rq_repmsg == NULL) {
 894                 CDEBUG(D_RPCTRACE, "request failed to send: %p, %d\n", req,
 895                        req->rq_status);
 896                 if (rc == 0)
 897                         rc = req->rq_status ?: -EIO;
 898         } else if (rc == 0 || rc == -EAGAIN) {
 899                 struct mdt_body *body;
 900
 901                 rc = lustre_msg_get_status(req->rq_repmsg);
 902                 if (lustre_msg_get_type(req->rq_repmsg) == PTL_RPC_MSG_ERR) {
 903                         DEBUG_REQ(D_ERROR, req, "type == PTL_RPC_MSG_ERR, err "
 904                                   "= %d", rc);
 905                         if (rc > 0)
 906                                 rc = -rc;
 907                 }
 908                 body = req_capsule_server_get(&req->rq_pill, &RMF_MDT_BODY);
 909                 if (body == NULL)
 910                         rc = -EPROTO;
 911         } else if (rc == -ESTALE) {
 912                 /**
 913                  * it can be allowed error after 3633 if open was committed and
 914                  * server failed before close was sent. Let's check if mod
 915                  * exists and return no error in that case
 916                  */
 917                 if (mod) {
 918                         DEBUG_REQ(D_HA, req, "Reset ESTALE = %d", rc);
 919                         LASSERT(mod->mod_open_req != NULL);
 920                         if (mod->mod_open_req->rq_committed)
 921                                 rc = 0;
 922                 }
 923         }
 924
 925         if (mod) {
 926                 if (rc != 0)
 927                         mod->mod_close_req = NULL;
 928                 /* Since now, mod is accessed through open_req only,
 929                  * thus close req does not keep a reference on mod anymore. */
 930                 obd_mod_put(mod);
 931         }
 932         *request = req;
 933
 934         RETURN(rc < 0 ? rc : saved_rc);
 935 }
 936
 937 static int mdc_getpage(struct obd_export *exp, const struct lu_fid *fid,
 938                        __u64 offset, struct obd_capa *oc,
 939                        struct page **pages, int npages,
 940                        struct ptlrpc_request **request)
 941 {
 942         struct ptlrpc_request   *req;
 943         struct ptlrpc_bulk_desc *desc;
 944         int                      i;
 945         wait_queue_head_t        waitq;
 946         int                      resends = 0;
 947         struct l_wait_info       lwi;
 948         int                      rc;
 949         ENTRY;
 950
 951         *request = NULL;
 952         init_waitqueue_head(&waitq);
 953
 954 restart_bulk:
 955         req = ptlrpc_request_alloc(class_exp2cliimp(exp), &RQF_MDS_READPAGE);
 956         if (req == NULL)
 957                 RETURN(-ENOMEM);
 958
 959         mdc_set_capa_size(req, &RMF_CAPA1, oc);
 960
 961         rc = ptlrpc_request_pack(req, LUSTRE_MDS_VERSION, MDS_READPAGE);
 962         if (rc) {
 963                 ptlrpc_request_free(req);
 964                 RETURN(rc);
 965         }
 966
 967         req->rq_request_portal = MDS_READPAGE_PORTAL;
 968         ptlrpc_at_set_req_timeout(req);
 969
 970         desc = ptlrpc_prep_bulk_imp(req, npages, 1, BULK_PUT_SINK,
 971                                     MDS_BULK_PORTAL);
 972         if (desc == NULL) {
 973                 ptlrpc_request_free(req);
 974                 RETURN(-ENOMEM);
 975         }
 976
 977         /* NB req now owns desc and will free it when it gets freed */
 978         for (i = 0; i < npages; i++)
 979                 ptlrpc_prep_bulk_page_pin(desc, pages[i], 0, PAGE_CACHE_SIZE);
 980
 981         mdc_readdir_pack(req, offset, PAGE_CACHE_SIZE * npages, fid, oc);
 982
 983         ptlrpc_request_set_replen(req);
 984         rc = ptlrpc_queue_wait(req);
 985         if (rc) {
 986                 ptlrpc_req_finished(req);
 987                 if (rc != -ETIMEDOUT)
 988                         RETURN(rc);
 989
 990                 resends++;
 991                 if (!client_should_resend(resends, &exp->exp_obd->u.cli)) {
 992                         CERROR("%s: too many resend retries: rc = %d\n",
 993                                exp->exp_obd->obd_name, -EIO);
 994                         RETURN(-EIO);
 995                 }
 996                 lwi = LWI_TIMEOUT_INTR(cfs_time_seconds(resends), NULL, NULL,
 997                                        NULL);
 998                 l_wait_event(waitq, 0, &lwi);
 999
1000                 goto restart_bulk;
1001         }
1002
1003         rc = sptlrpc_cli_unwrap_bulk_read(req, req->rq_bulk,
1004                                           req->rq_bulk->bd_nob_transferred);
1005         if (rc < 0) {
1006                 ptlrpc_req_finished(req);
1007                 RETURN(rc);
1008         }
1009
1010         if (req->rq_bulk->bd_nob_transferred & ~LU_PAGE_MASK) {
1011                 CERROR("%s: unexpected bytes transferred: %d (%ld expected)\n",
1012                        exp->exp_obd->obd_name, req->rq_bulk->bd_nob_transferred,
1013                        PAGE_CACHE_SIZE * npages);
1014                 ptlrpc_req_finished(req);
1015                 RETURN(-EPROTO);
1016         }
1017
1018         *request = req;
1019         RETURN(0);
1020 }
1021
1022 static void mdc_release_page(struct page *page, int remove)
1023 {
1024         if (remove) {
1025                 lock_page(page);
1026                 if (likely(page->mapping != NULL))
1027                         truncate_complete_page(page->mapping, page);
1028                 unlock_page(page);
1029         }
1030         page_cache_release(page);
1031 }
1032
1033 static struct page *mdc_page_locate(struct address_space *mapping, __u64 *hash,
1034                                     __u64 *start, __u64 *end, int hash64)
1035 {
1036         /*
1037          * Complement of hash is used as an index so that
1038          * radix_tree_gang_lookup() can be used to find a page with starting
1039          * hash _smaller_ than one we are looking for.
1040          */
1041         unsigned long offset = hash_x_index(*hash, hash64);
1042         struct page *page;
1043         int found;
1044
1045         spin_lock_irq(&mapping->tree_lock);
1046         found = radix_tree_gang_lookup(&mapping->page_tree,
1047                                        (void **)&page, offset, 1);
1048         if (found > 0 && !radix_tree_exceptional_entry(page)) {
1049                 struct lu_dirpage *dp;
1050
1051                 page_cache_get(page);
1052                 spin_unlock_irq(&mapping->tree_lock);
1053                 /*
1054                  * In contrast to find_lock_page() we are sure that directory
1055                  * page cannot be truncated (while DLM lock is held) and,
1056                  * hence, can avoid restart.
1057                  *
1058                  * In fact, page cannot be locked here at all, because
1059                  * mdc_read_page_remote does synchronous io.
1060                  */
1061                 wait_on_page_locked(page);
1062                 if (PageUptodate(page)) {
1063                         dp = kmap(page);
1064                         if (BITS_PER_LONG == 32 && hash64) {
1065                                 *start = le64_to_cpu(dp->ldp_hash_start) >> 32;
1066                                 *end   = le64_to_cpu(dp->ldp_hash_end) >> 32;
1067                                 *hash  = *hash >> 32;
1068                         } else {
1069                                 *start = le64_to_cpu(dp->ldp_hash_start);
1070                                 *end   = le64_to_cpu(dp->ldp_hash_end);
1071                         }
1072                         if (unlikely(*start == 1 && *hash == 0))
1073                                 *hash = *start;
1074                         else
1075                                 LASSERTF(*start <= *hash, "start = "LPX64
1076                                          ",end = "LPX64",hash = "LPX64"\n",
1077                                          *start, *end, *hash);
1078                         CDEBUG(D_VFSTRACE, "offset %lx ["LPX64" "LPX64"],"
1079                               " hash "LPX64"\n", offset, *start, *end, *hash);
1080                         if (*hash > *end) {
1081                                 kunmap(page);
1082                                 mdc_release_page(page, 0);
1083                                 page = NULL;
1084                         } else if (*end != *start && *hash == *end) {
1085                                 /*
1086                                  * upon hash collision, remove this page,
1087                                  * otherwise put page reference, and
1088                                  * mdc_read_page_remote() will issue RPC to
1089                                  * fetch the page we want.
1090                                  */
1091                                 kunmap(page);
1092                                 mdc_release_page(page,
1093                                     le32_to_cpu(dp->ldp_flags) & LDF_COLLIDE);
1094                                 page = NULL;
1095                         }
1096                 } else {
1097                         page_cache_release(page);
1098                         page = ERR_PTR(-EIO);
1099                 }
1100         } else {
1101                 spin_unlock_irq(&mapping->tree_lock);
1102                 page = NULL;
1103         }
1104         return page;
1105 }
1106
1107 /*
1108  * Adjust a set of pages, each page containing an array of lu_dirpages,
1109  * so that each page can be used as a single logical lu_dirpage.
1110  *
1111  * A lu_dirpage is laid out as follows, where s = ldp_hash_start,
1112  * e = ldp_hash_end, f = ldp_flags, p = padding, and each "ent" is a
1113  * struct lu_dirent.  It has size up to LU_PAGE_SIZE. The ldp_hash_end
1114  * value is used as a cookie to request the next lu_dirpage in a
1115  * directory listing that spans multiple pages (two in this example):
1116  *   ________
1117  *  |        |
1118  * .|--------v-------   -----.
1119  * |s|e|f|p|ent|ent| ... |ent|
1120  * '--|--------------   -----'   Each PAGE contains a single
1121  *    '------.                   lu_dirpage.
1122  * .---------v-------   -----.
1123  * |s|e|f|p|ent| 0 | ... | 0 |
1124  * '-----------------   -----'
1125  *
1126  * However, on hosts where the native VM page size (PAGE_CACHE_SIZE) is
1127  * larger than LU_PAGE_SIZE, a single host page may contain multiple
1128  * lu_dirpages. After reading the lu_dirpages from the MDS, the
1129  * ldp_hash_end of the first lu_dirpage refers to the one immediately
1130  * after it in the same PAGE (arrows simplified for brevity, but
1131  * in general e0==s1, e1==s2, etc.):
1132  *
1133  * .--------------------   -----.
1134  * |s0|e0|f0|p|ent|ent| ... |ent|
1135  * |---v----------------   -----|
1136  * |s1|e1|f1|p|ent|ent| ... |ent|
1137  * |---v----------------   -----|  Here, each PAGE contains
1138  *             ...                 multiple lu_dirpages.
1139  * |---v----------------   -----|
1140  * |s'|e'|f'|p|ent|ent| ... |ent|
1141  * '---|----------------   -----'
1142  *     v
1143  * .----------------------------.
1144  * |        next PAGE           |
1145  *
1146  * This structure is transformed into a single logical lu_dirpage as follows:
1147  *
1148  * - Replace e0 with e' so the request for the next lu_dirpage gets the page
1149  *   labeled 'next PAGE'.
1150  *
1151  * - Copy the LDF_COLLIDE flag from f' to f0 to correctly reflect whether
1152  *   a hash collision with the next page exists.
1153  *
1154  * - Adjust the lde_reclen of the ending entry of each lu_dirpage to span
1155  *   to the first entry of the next lu_dirpage.
1156  */
1157 #if PAGE_CACHE_SIZE > LU_PAGE_SIZE
1158 static void mdc_adjust_dirpages(struct page **pages, int cfs_pgs, int lu_pgs)
1159 {
1160         int i;
1161
1162         for (i = 0; i < cfs_pgs; i++) {
1163                 struct lu_dirpage       *dp = kmap(pages[i]);
1164                 struct lu_dirpage       *first = dp;
1165                 struct lu_dirent        *end_dirent = NULL;
1166                 struct lu_dirent        *ent;
1167                 __u64           hash_end = le64_to_cpu(dp->ldp_hash_end);
1168                 __u32           flags = le32_to_cpu(dp->ldp_flags);
1169
1170                 while (--lu_pgs > 0) {
1171                         ent = lu_dirent_start(dp);
1172                         for (end_dirent = ent; ent != NULL;
1173                              end_dirent = ent, ent = lu_dirent_next(ent));
1174
1175                         /* Advance dp to next lu_dirpage. */
1176                         dp = (struct lu_dirpage *)((char *)dp + LU_PAGE_SIZE);
1177
1178                         /* Check if we've reached the end of the PAGE. */
1179                         if (!((unsigned long)dp & ~PAGE_MASK))
1180                                 break;
1181
1182                         /* Save the hash and flags of this lu_dirpage. */
1183                         hash_end = le64_to_cpu(dp->ldp_hash_end);
1184                         flags = le32_to_cpu(dp->ldp_flags);
1185
1186                         /* Check if lu_dirpage contains no entries. */
1187                         if (end_dirent == NULL)
1188                                 break;
1189
1190                         /* Enlarge the end entry lde_reclen from 0 to
1191                          * first entry of next lu_dirpage. */
1192                         LASSERT(le16_to_cpu(end_dirent->lde_reclen) == 0);
1193                         end_dirent->lde_reclen =
1194                                 cpu_to_le16((char *)(dp->ldp_entries) -
1195                                             (char *)end_dirent);
1196                 }
1197
1198                 first->ldp_hash_end = hash_end;
1199                 first->ldp_flags &= ~cpu_to_le32(LDF_COLLIDE);
1200                 first->ldp_flags |= flags & cpu_to_le32(LDF_COLLIDE);
1201
1202                 kunmap(pages[i]);
1203         }
1204         LASSERTF(lu_pgs == 0, "left = %d\n", lu_pgs);
1205 }
1206 #else
1207 #define mdc_adjust_dirpages(pages, cfs_pgs, lu_pgs) do {} while (0)
1208 #endif  /* PAGE_CACHE_SIZE > LU_PAGE_SIZE */
1209
1210 /* parameters for readdir page */
1211 struct readpage_param {
1212         struct md_op_data       *rp_mod;
1213         __u64                   rp_off;
1214         int                     rp_hash64;
1215         struct obd_export       *rp_exp;
1216         struct md_callback      *rp_cb;
1217 };
1218
1219 #ifndef HAVE_DELETE_FROM_PAGE_CACHE
1220 static inline void delete_from_page_cache(struct page *page)
1221 {
1222         remove_from_page_cache(page);
1223         page_cache_release(page);
1224 }
1225 #endif
1226
1227 /**
1228  * Read pages from server.
1229  *
1230  * Page in MDS_READPAGE RPC is packed in LU_PAGE_SIZE, and each page contains
1231  * a header lu_dirpage which describes the start/end hash, and whether this
1232  * page is empty (contains no dir entry) or hash collide with next page.
1233  * After client receives reply, several pages will be integrated into dir page
1234  * in PAGE_SIZE (if PAGE_SIZE greater than LU_PAGE_SIZE), and the
1235  * lu_dirpage for this integrated page will be adjusted.
1236  **/
1237 static int mdc_read_page_remote(void *data, struct page *page0)
1238 {
1239         struct readpage_param   *rp = data;
1240         struct page             **page_pool;
1241         struct page             *page;
1242         struct lu_dirpage       *dp;
1243         int                     rd_pgs = 0; /* number of pages read actually */
1244         int                     npages;
1245         struct md_op_data       *op_data = rp->rp_mod;
1246         struct ptlrpc_request   *req;
1247         int                     max_pages = op_data->op_max_pages;
1248         struct inode            *inode;
1249         struct lu_fid           *fid;
1250         int                     i;
1251         int                     rc;
1252         ENTRY;
1253
1254         LASSERT(max_pages > 0 && max_pages <= PTLRPC_MAX_BRW_PAGES);
1255         inode = op_data->op_data;
1256         fid = &op_data->op_fid1;
1257         LASSERT(inode != NULL);
1258
1259         OBD_ALLOC(page_pool, sizeof(page_pool[0]) * max_pages);
1260         if (page_pool != NULL) {
1261                 page_pool[0] = page0;
1262         } else {
1263                 page_pool = &page0;
1264                 max_pages = 1;
1265         }
1266
1267         for (npages = 1; npages < max_pages; npages++) {
1268                 page = page_cache_alloc_cold(inode->i_mapping);
1269                 if (page == NULL)
1270                         break;
1271                 page_pool[npages] = page;
1272         }
1273
1274         rc = mdc_getpage(rp->rp_exp, fid, rp->rp_off, op_data->op_capa1,
1275                          page_pool, npages, &req);
1276         if (rc < 0) {
1277                 /* page0 is special, which was added into page cache early */
1278                 delete_from_page_cache(page0);
1279         } else {
1280                 int lu_pgs;
1281
1282                 rd_pgs = (req->rq_bulk->bd_nob_transferred +
1283                             PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
1284                 lu_pgs = req->rq_bulk->bd_nob_transferred >>
1285                                                         LU_PAGE_SHIFT;
1286                 LASSERT(!(req->rq_bulk->bd_nob_transferred & ~LU_PAGE_MASK));
1287
1288                 CDEBUG(D_INODE, "read %d(%d) pages\n", rd_pgs, lu_pgs);
1289
1290                 mdc_adjust_dirpages(page_pool, rd_pgs, lu_pgs);
1291
1292                 SetPageUptodate(page0);
1293         }
1294         unlock_page(page0);
1295
1296         ptlrpc_req_finished(req);
1297         CDEBUG(D_CACHE, "read %d/%d pages\n", rd_pgs, npages);
1298         for (i = 1; i < npages; i++) {
1299                 unsigned long   offset;
1300                 __u64           hash;
1301                 int ret;
1302
1303                 page = page_pool[i];
1304
1305                 if (rc < 0 || i >= rd_pgs) {
1306                         page_cache_release(page);
1307                         continue;
1308                 }
1309
1310                 SetPageUptodate(page);
1311
1312                 dp = kmap(page);
1313                 hash = le64_to_cpu(dp->ldp_hash_start);
1314                 kunmap(page);
1315
1316                 offset = hash_x_index(hash, rp->rp_hash64);
1317
1318                 prefetchw(&page->flags);
1319                 ret = add_to_page_cache_lru(page, inode->i_mapping, offset,
1320                                             GFP_KERNEL);
1321                 if (ret == 0)
1322                         unlock_page(page);
1323                 else
1324                         CDEBUG(D_VFSTRACE, "page %lu add to page cache failed:"
1325                                " rc = %d\n", offset, ret);
1326                 page_cache_release(page);
1327         }
1328
1329         if (page_pool != &page0)
1330                 OBD_FREE(page_pool, sizeof(page_pool[0]) * max_pages);
1331
1332         RETURN(rc);
1333 }
1334
1335 /**
1336  * Read dir page from cache first, if it can not find it, read it from
1337  * server and add into the cache.
1338  *
1339  * \param[in] exp       MDC export
1340  * \param[in] op_data   client MD stack parameters, transfering parameters
1341  *                      between different layers on client MD stack.
1342  * \param[in] cb_op     callback required for ldlm lock enqueue during
1343  *                      read page
1344  * \param[in] hash_offset the hash offset of the page to be read
1345  * \param[in] ppage     the page to be read
1346  *
1347  * retval               = 0 get the page successfully
1348  *                      errno(<0) get the page failed
1349  */
1350 static int mdc_read_page(struct obd_export *exp, struct md_op_data *op_data,
1351                          struct md_callback *cb_op, __u64 hash_offset,
1352                          struct page **ppage)
1353 {
1354         struct lookup_intent    it = { .it_op = IT_READDIR };
1355         struct page             *page;
1356         struct inode            *dir = op_data->op_data;
1357         struct address_space    *mapping;
1358         struct lu_dirpage       *dp;
1359         __u64                   start = 0;
1360         __u64                   end = 0;
1361         struct lustre_handle    lockh;
1362         struct ptlrpc_request   *enq_req = NULL;
1363         struct readpage_param   rp_param;
1364         int rc;
1365
1366         ENTRY;
1367
1368         *ppage = NULL;
1369
1370         LASSERT(dir != NULL);
1371         mapping = dir->i_mapping;
1372
1373         rc = mdc_intent_lock(exp, op_data, &it, &enq_req,
1374                              cb_op->md_blocking_ast, 0);
1375         if (enq_req != NULL)
1376                 ptlrpc_req_finished(enq_req);
1377
1378         if (rc < 0) {
1379                 CERROR("%s: "DFID" lock enqueue fails: rc = %d\n",
1380                        exp->exp_obd->obd_name, PFID(&op_data->op_fid1), rc);
1381                 RETURN(rc);
1382         }
1383
1384         rc = 0;
1385         mdc_set_lock_data(exp, &it.d.lustre.it_lock_handle, dir, NULL);
1386
1387         rp_param.rp_off = hash_offset;
1388         rp_param.rp_hash64 = op_data->op_cli_flags & CLI_HASH64;
1389         page = mdc_page_locate(mapping, &rp_param.rp_off, &start, &end,
1390                                rp_param.rp_hash64);
1391         if (IS_ERR(page)) {
1392                 CERROR("%s: dir page locate: "DFID" at "LPU64": rc %ld\n",
1393                        exp->exp_obd->obd_name, PFID(&op_data->op_fid1),
1394                        rp_param.rp_off, PTR_ERR(page));
1395                 GOTO(out_unlock, rc = PTR_ERR(page));
1396         } else if (page != NULL) {
1397                 /*
1398                  * XXX nikita: not entirely correct handling of a corner case:
1399                  * suppose hash chain of entries with hash value HASH crosses
1400                  * border between pages P0 and P1. First both P0 and P1 are
1401                  * cached, seekdir() is called for some entry from the P0 part
1402                  * of the chain. Later P0 goes out of cache. telldir(HASH)
1403                  * happens and finds P1, as it starts with matching hash
1404                  * value. Remaining entries from P0 part of the chain are
1405                  * skipped. (Is that really a bug?)
1406                  *
1407                  * Possible solutions: 0. don't cache P1 is such case, handle
1408                  * it as an "overflow" page. 1. invalidate all pages at
1409                  * once. 2. use HASH|1 as an index for P1.
1410                  */
1411                 GOTO(hash_collision, page);
1412         }
1413
1414         rp_param.rp_exp = exp;
1415         rp_param.rp_mod = op_data;
1416         page = read_cache_page(mapping,
1417                                hash_x_index(rp_param.rp_off,
1418                                             rp_param.rp_hash64),
1419                                mdc_read_page_remote, &rp_param);
1420         if (IS_ERR(page)) {
1421                 CDEBUG(D_INFO, "%s: read cache page: "DFID" at "LPU64": %ld\n",
1422                        exp->exp_obd->obd_name, PFID(&op_data->op_fid1),
1423                        rp_param.rp_off, PTR_ERR(page));
1424                 GOTO(out_unlock, rc = PTR_ERR(page));
1425         }
1426
1427         wait_on_page_locked(page);
1428         (void)kmap(page);
1429         if (!PageUptodate(page)) {
1430                 CERROR("%s: page not updated: "DFID" at "LPU64": rc %d\n",
1431                        exp->exp_obd->obd_name, PFID(&op_data->op_fid1),
1432                        rp_param.rp_off, -5);
1433                 goto fail;
1434         }
1435         if (!PageChecked(page))
1436                 SetPageChecked(page);
1437         if (PageError(page)) {
1438                 CERROR("%s: page error: "DFID" at "LPU64": rc %d\n",
1439                        exp->exp_obd->obd_name, PFID(&op_data->op_fid1),
1440                        rp_param.rp_off, -5);
1441                 goto fail;
1442         }
1443
1444 hash_collision:
1445         dp = page_address(page);
1446         if (BITS_PER_LONG == 32 && rp_param.rp_hash64) {
1447                 start = le64_to_cpu(dp->ldp_hash_start) >> 32;
1448                 end   = le64_to_cpu(dp->ldp_hash_end) >> 32;
1449                 rp_param.rp_off = hash_offset >> 32;
1450         } else {
1451                 start = le64_to_cpu(dp->ldp_hash_start);
1452                 end   = le64_to_cpu(dp->ldp_hash_end);
1453                 rp_param.rp_off = hash_offset;
1454         }
1455         if (end == start) {
1456                 LASSERT(start == rp_param.rp_off);
1457                 CWARN("Page-wide hash collision: %#lx\n", (unsigned long)end);
1458 #if BITS_PER_LONG == 32
1459                 CWARN("Real page-wide hash collision at ["LPU64" "LPU64"] with "
1460                       "hash "LPU64"\n", le64_to_cpu(dp->ldp_hash_start),
1461                       le64_to_cpu(dp->ldp_hash_end), hash_offset);
1462 #endif
1463
1464                 /*
1465                  * Fetch whole overflow chain...
1466                  *
1467                  * XXX not yet.
1468                  */
1469                 goto fail;
1470         }
1471         *ppage = page;
1472 out_unlock:
1473         lockh.cookie = it.d.lustre.it_lock_handle;
1474         ldlm_lock_decref(&lockh, it.d.lustre.it_lock_mode);
1475         it.d.lustre.it_lock_handle = 0;
1476         return rc;
1477 fail:
1478         kunmap(page);
1479         mdc_release_page(page, 1);
1480         rc = -EIO;
1481         goto out_unlock;
1482 }
1483
1484
1485 static int mdc_statfs(const struct lu_env *env,
1486                       struct obd_export *exp, struct obd_statfs *osfs,
1487                       __u64 max_age, __u32 flags)
1488 {
1489         struct obd_device     *obd = class_exp2obd(exp);
1490         struct ptlrpc_request *req;
1491         struct obd_statfs     *msfs;
1492         struct obd_import     *imp = NULL;
1493         int                    rc;
1494         ENTRY;
1495
1496         /*
1497          * Since the request might also come from lprocfs, so we need
1498          * sync this with client_disconnect_export Bug15684
1499          */
1500         down_read(&obd->u.cli.cl_sem);
1501         if (obd->u.cli.cl_import)
1502                 imp = class_import_get(obd->u.cli.cl_import);
1503         up_read(&obd->u.cli.cl_sem);
1504         if (!imp)
1505                 RETURN(-ENODEV);
1506
1507         req = ptlrpc_request_alloc_pack(imp, &RQF_MDS_STATFS,
1508                                         LUSTRE_MDS_VERSION, MDS_STATFS);
1509         if (req == NULL)
1510                 GOTO(output, rc = -ENOMEM);
1511
1512         ptlrpc_request_set_replen(req);
1513
1514         if (flags & OBD_STATFS_NODELAY) {
1515                 /* procfs requests not want stay in wait for avoid deadlock */
1516                 req->rq_no_resend = 1;
1517                 req->rq_no_delay = 1;
1518         }
1519
1520         rc = ptlrpc_queue_wait(req);
1521         if (rc) {
1522                 /* check connection error first */
1523                 if (imp->imp_connect_error)
1524                         rc = imp->imp_connect_error;
1525                 GOTO(out, rc);
1526         }
1527
1528         msfs = req_capsule_server_get(&req->rq_pill, &RMF_OBD_STATFS);
1529         if (msfs == NULL)
1530                 GOTO(out, rc = -EPROTO);
1531
1532         *osfs = *msfs;
1533         EXIT;
1534 out:
1535         ptlrpc_req_finished(req);
1536 output:
1537         class_import_put(imp);
1538         return rc;
1539 }
1540
1541 static int mdc_ioc_fid2path(struct obd_export *exp, struct getinfo_fid2path *gf)
1542 {
1543         __u32 keylen, vallen;
1544         void *key;
1545         int rc;
1546
1547         if (gf->gf_pathlen > PATH_MAX)
1548                 RETURN(-ENAMETOOLONG);
1549         if (gf->gf_pathlen < 2)
1550                 RETURN(-EOVERFLOW);
1551
1552         /* Key is KEY_FID2PATH + getinfo_fid2path description */
1553         keylen = cfs_size_round(sizeof(KEY_FID2PATH)) + sizeof(*gf);
1554         OBD_ALLOC(key, keylen);
1555         if (key == NULL)
1556                 RETURN(-ENOMEM);
1557         memcpy(key, KEY_FID2PATH, sizeof(KEY_FID2PATH));
1558         memcpy(key + cfs_size_round(sizeof(KEY_FID2PATH)), gf, sizeof(*gf));
1559
1560         CDEBUG(D_IOCTL, "path get "DFID" from "LPU64" #%d\n",
1561                PFID(&gf->gf_fid), gf->gf_recno, gf->gf_linkno);
1562
1563         if (!fid_is_sane(&gf->gf_fid))
1564                 GOTO(out, rc = -EINVAL);
1565
1566         /* Val is struct getinfo_fid2path result plus path */
1567         vallen = sizeof(*gf) + gf->gf_pathlen;
1568
1569         rc = obd_get_info(NULL, exp, keylen, key, &vallen, gf);
1570         if (rc != 0 && rc != -EREMOTE)
1571                 GOTO(out, rc);
1572
1573         if (vallen <= sizeof(*gf))
1574                 GOTO(out, rc = -EPROTO);
1575         else if (vallen > sizeof(*gf) + gf->gf_pathlen)
1576                 GOTO(out, rc = -EOVERFLOW);
1577
1578         CDEBUG(D_IOCTL, "path get "DFID" from "LPU64" #%d\n%s\n",
1579                PFID(&gf->gf_fid), gf->gf_recno, gf->gf_linkno, gf->gf_path);
1580
1581 out:
1582         OBD_FREE(key, keylen);
1583         return rc;
1584 }
1585
1586 static int mdc_ioc_hsm_progress(struct obd_export *exp,
1587                                 struct hsm_progress_kernel *hpk)
1588 {
1589         struct obd_import               *imp = class_exp2cliimp(exp);
1590         struct hsm_progress_kernel      *req_hpk;
1591         struct ptlrpc_request           *req;
1592         int                              rc;
1593         ENTRY;
1594
1595         req = ptlrpc_request_alloc_pack(imp, &RQF_MDS_HSM_PROGRESS,
1596                                         LUSTRE_MDS_VERSION, MDS_HSM_PROGRESS);
1597         if (req == NULL)
1598                 GOTO(out, rc = -ENOMEM);
1599
1600         mdc_pack_body(req, NULL, NULL, OBD_MD_FLRMTPERM, 0, -1, 0);
1601
1602         /* Copy hsm_progress struct */
1603         req_hpk = req_capsule_client_get(&req->rq_pill, &RMF_MDS_HSM_PROGRESS);
1604         if (req_hpk == NULL)
1605                 GOTO(out, rc = -EPROTO);
1606
1607         *req_hpk = *hpk;
1608         req_hpk->hpk_errval = lustre_errno_hton(hpk->hpk_errval);
1609
1610         ptlrpc_request_set_replen(req);
1611
1612         mdc_get_rpc_lock(exp->exp_obd->u.cli.cl_rpc_lock, NULL);
1613         rc = ptlrpc_queue_wait(req);
1614         mdc_put_rpc_lock(exp->exp_obd->u.cli.cl_rpc_lock, NULL);
1615
1616         GOTO(out, rc);
1617 out:
1618         ptlrpc_req_finished(req);
1619         return rc;
1620 }
1621
1622 static int mdc_ioc_hsm_ct_register(struct obd_import *imp, __u32 archives)
1623 {
1624         __u32                   *archive_mask;
1625         struct ptlrpc_request   *req;
1626         int                      rc;
1627         ENTRY;
1628
1629         req = ptlrpc_request_alloc_pack(imp, &RQF_MDS_HSM_CT_REGISTER,
1630                                         LUSTRE_MDS_VERSION,
1631                                         MDS_HSM_CT_REGISTER);
1632         if (req == NULL)
1633                 GOTO(out, rc = -ENOMEM);
1634
1635         mdc_pack_body(req, NULL, NULL, OBD_MD_FLRMTPERM, 0, -1, 0);
1636
1637         /* Copy hsm_progress struct */
1638         archive_mask = req_capsule_client_get(&req->rq_pill,
1639                                               &RMF_MDS_HSM_ARCHIVE);
1640         if (archive_mask == NULL)
1641                 GOTO(out, rc = -EPROTO);
1642
1643         *archive_mask = archives;
1644
1645         ptlrpc_request_set_replen(req);
1646
1647         rc = mdc_queue_wait(req);
1648         GOTO(out, rc);
1649 out:
1650         ptlrpc_req_finished(req);
1651         return rc;
1652 }
1653
1654 static int mdc_ioc_hsm_current_action(struct obd_export *exp,
1655                                       struct md_op_data *op_data)
1656 {
1657         struct hsm_current_action       *hca = op_data->op_data;
1658         struct hsm_current_action       *req_hca;
1659         struct ptlrpc_request           *req;
1660         int                              rc;
1661         ENTRY;
1662
1663         req = ptlrpc_request_alloc(class_exp2cliimp(exp),
1664                                    &RQF_MDS_HSM_ACTION);
1665         if (req == NULL)
1666                 RETURN(-ENOMEM);
1667
1668         mdc_set_capa_size(req, &RMF_CAPA1, op_data->op_capa1);
1669
1670         rc = ptlrpc_request_pack(req, LUSTRE_MDS_VERSION, MDS_HSM_ACTION);
1671         if (rc) {
1672                 ptlrpc_request_free(req);
1673                 RETURN(rc);
1674         }
1675
1676         mdc_pack_body(req, &op_data->op_fid1, op_data->op_capa1,
1677                       OBD_MD_FLRMTPERM, 0, op_data->op_suppgids[0], 0);
1678
1679         ptlrpc_request_set_replen(req);
1680
1681         rc = mdc_queue_wait(req);
1682         if (rc)
1683                 GOTO(out, rc);
1684
1685         req_hca = req_capsule_server_get(&req->rq_pill,
1686                                          &RMF_MDS_HSM_CURRENT_ACTION);
1687         if (req_hca == NULL)
1688                 GOTO(out, rc = -EPROTO);
1689
1690         *hca = *req_hca;
1691
1692         EXIT;
1693 out:
1694         ptlrpc_req_finished(req);
1695         return rc;
1696 }
1697
1698 static int mdc_ioc_hsm_ct_unregister(struct obd_import *imp)
1699 {
1700         struct ptlrpc_request   *req;
1701         int                      rc;
1702         ENTRY;
1703
1704         req = ptlrpc_request_alloc_pack(imp, &RQF_MDS_HSM_CT_UNREGISTER,
1705                                         LUSTRE_MDS_VERSION,
1706                                         MDS_HSM_CT_UNREGISTER);
1707         if (req == NULL)
1708                 GOTO(out, rc = -ENOMEM);
1709
1710         mdc_pack_body(req, NULL, NULL, OBD_MD_FLRMTPERM, 0, -1, 0);
1711
1712         ptlrpc_request_set_replen(req);
1713
1714         rc = mdc_queue_wait(req);
1715         GOTO(out, rc);
1716 out:
1717         ptlrpc_req_finished(req);
1718         return rc;
1719 }
1720
1721 static int mdc_ioc_hsm_state_get(struct obd_export *exp,
1722                                  struct md_op_data *op_data)
1723 {
1724         struct hsm_user_state   *hus = op_data->op_data;
1725         struct hsm_user_state   *req_hus;
1726         struct ptlrpc_request   *req;
1727         int                      rc;
1728         ENTRY;
1729
1730         req = ptlrpc_request_alloc(class_exp2cliimp(exp),
1731                                    &RQF_MDS_HSM_STATE_GET);
1732         if (req == NULL)
1733                 RETURN(-ENOMEM);
1734
1735         mdc_set_capa_size(req, &RMF_CAPA1, op_data->op_capa1);
1736
1737         rc = ptlrpc_request_pack(req, LUSTRE_MDS_VERSION, MDS_HSM_STATE_GET);
1738         if (rc != 0) {
1739                 ptlrpc_request_free(req);
1740                 RETURN(rc);
1741         }
1742
1743         mdc_pack_body(req, &op_data->op_fid1, op_data->op_capa1,
1744                       OBD_MD_FLRMTPERM, 0, op_data->op_suppgids[0], 0);
1745
1746         ptlrpc_request_set_replen(req);
1747
1748         rc = mdc_queue_wait(req);
1749         if (rc)
1750                 GOTO(out, rc);
1751
1752         req_hus = req_capsule_server_get(&req->rq_pill, &RMF_HSM_USER_STATE);
1753         if (req_hus == NULL)
1754                 GOTO(out, rc = -EPROTO);
1755
1756         *hus = *req_hus;
1757
1758         EXIT;
1759 out:
1760         ptlrpc_req_finished(req);
1761         return rc;
1762 }
1763
1764 static int mdc_ioc_hsm_state_set(struct obd_export *exp,
1765                                  struct md_op_data *op_data)
1766 {
1767         struct hsm_state_set    *hss = op_data->op_data;
1768         struct hsm_state_set    *req_hss;
1769         struct ptlrpc_request   *req;
1770         int                      rc;
1771         ENTRY;
1772
1773         req = ptlrpc_request_alloc(class_exp2cliimp(exp),
1774                                    &RQF_MDS_HSM_STATE_SET);
1775         if (req == NULL)
1776                 RETURN(-ENOMEM);
1777
1778         mdc_set_capa_size(req, &RMF_CAPA1, op_data->op_capa1);
1779
1780         rc = ptlrpc_request_pack(req, LUSTRE_MDS_VERSION, MDS_HSM_STATE_SET);
1781         if (rc) {
1782                 ptlrpc_request_free(req);
1783                 RETURN(rc);
1784         }
1785
1786         mdc_pack_body(req, &op_data->op_fid1, op_data->op_capa1,
1787                       OBD_MD_FLRMTPERM, 0, op_data->op_suppgids[0], 0);
1788
1789         /* Copy states */
1790         req_hss = req_capsule_client_get(&req->rq_pill, &RMF_HSM_STATE_SET);
1791         if (req_hss == NULL)
1792                 GOTO(out, rc = -EPROTO);
1793         *req_hss = *hss;
1794
1795         ptlrpc_request_set_replen(req);
1796
1797         mdc_get_rpc_lock(exp->exp_obd->u.cli.cl_rpc_lock, NULL);
1798         rc = ptlrpc_queue_wait(req);
1799         mdc_put_rpc_lock(exp->exp_obd->u.cli.cl_rpc_lock, NULL);
1800
1801         GOTO(out, rc);
1802 out:
1803         ptlrpc_req_finished(req);
1804         return rc;
1805 }
1806
1807 static int mdc_ioc_hsm_request(struct obd_export *exp,
1808                                struct hsm_user_request *hur)
1809 {
1810         struct obd_import       *imp = class_exp2cliimp(exp);
1811         struct ptlrpc_request   *req;
1812         struct hsm_request      *req_hr;
1813         struct hsm_user_item    *req_hui;
1814         char                    *req_opaque;
1815         int                      rc;
1816         ENTRY;
1817
1818         req = ptlrpc_request_alloc(imp, &RQF_MDS_HSM_REQUEST);
1819         if (req == NULL)
1820                 GOTO(out, rc = -ENOMEM);
1821
1822         req_capsule_set_size(&req->rq_pill, &RMF_MDS_HSM_USER_ITEM, RCL_CLIENT,
1823                              hur->hur_request.hr_itemcount
1824                              * sizeof(struct hsm_user_item));
1825         req_capsule_set_size(&req->rq_pill, &RMF_GENERIC_DATA, RCL_CLIENT,
1826                              hur->hur_request.hr_data_len);
1827
1828         rc = ptlrpc_request_pack(req, LUSTRE_MDS_VERSION, MDS_HSM_REQUEST);
1829         if (rc) {
1830                 ptlrpc_request_free(req);
1831                 RETURN(rc);
1832         }
1833
1834         mdc_pack_body(req, NULL, NULL, OBD_MD_FLRMTPERM, 0, -1, 0);
1835
1836         /* Copy hsm_request struct */
1837         req_hr = req_capsule_client_get(&req->rq_pill, &RMF_MDS_HSM_REQUEST);
1838         if (req_hr == NULL)
1839                 GOTO(out, rc = -EPROTO);
1840         *req_hr = hur->hur_request;
1841
1842         /* Copy hsm_user_item structs */
1843         req_hui = req_capsule_client_get(&req->rq_pill, &RMF_MDS_HSM_USER_ITEM);
1844         if (req_hui == NULL)
1845                 GOTO(out, rc = -EPROTO);
1846         memcpy(req_hui, hur->hur_user_item,
1847                hur->hur_request.hr_itemcount * sizeof(struct hsm_user_item));
1848
1849         /* Copy opaque field */
1850         req_opaque = req_capsule_client_get(&req->rq_pill, &RMF_GENERIC_DATA);
1851         if (req_opaque == NULL)
1852                 GOTO(out, rc = -EPROTO);
1853         memcpy(req_opaque, hur_data(hur), hur->hur_request.hr_data_len);
1854
1855         ptlrpc_request_set_replen(req);
1856
1857         mdc_get_rpc_lock(exp->exp_obd->u.cli.cl_rpc_lock, NULL);
1858         rc = ptlrpc_queue_wait(req);
1859         mdc_put_rpc_lock(exp->exp_obd->u.cli.cl_rpc_lock, NULL);
1860
1861         GOTO(out, rc);
1862
1863 out:
1864         ptlrpc_req_finished(req);
1865         return rc;
1866 }
1867
1868 static struct kuc_hdr *changelog_kuc_hdr(char *buf, size_t len, __u32 flags)
1869 {
1870         struct kuc_hdr *lh = (struct kuc_hdr *)buf;
1871
1872         LASSERT(len <= KUC_CHANGELOG_MSG_MAXSIZE);
1873
1874         lh->kuc_magic = KUC_MAGIC;
1875         lh->kuc_transport = KUC_TRANSPORT_CHANGELOG;
1876         lh->kuc_flags = flags;
1877         lh->kuc_msgtype = CL_RECORD;
1878         lh->kuc_msglen = len;
1879         return lh;
1880 }
1881
1882 struct changelog_show {
1883         __u64                            cs_startrec;
1884         enum changelog_send_flag         cs_flags;
1885         struct file                     *cs_fp;
1886         char                            *cs_buf;
1887         struct obd_device               *cs_obd;
1888 };
1889
1890 static inline char *cs_obd_name(struct changelog_show *cs)
1891 {
1892         return cs->cs_obd->obd_name;
1893 }
1894
1895 static int changelog_kkuc_cb(const struct lu_env *env, struct llog_handle *llh,
1896                              struct llog_rec_hdr *hdr, void *data)
1897 {
1898         struct changelog_show           *cs = data;
1899         struct llog_changelog_rec       *rec = (struct llog_changelog_rec *)hdr;
1900         struct kuc_hdr                  *lh;
1901         size_t                           len;
1902         int                              rc;
1903         ENTRY;
1904
1905         if (rec->cr_hdr.lrh_type != CHANGELOG_REC) {
1906                 rc = -EINVAL;
1907                 CERROR("%s: not a changelog rec %x/%d: rc = %d\n",
1908                        cs_obd_name(cs), rec->cr_hdr.lrh_type,
1909                        rec->cr.cr_type, rc);
1910                 RETURN(rc);
1911         }
1912
1913         if (rec->cr.cr_index < cs->cs_startrec) {
1914                 /* Skip entries earlier than what we are interested in */
1915                 CDEBUG(D_HSM, "rec="LPU64" start="LPU64"\n",
1916                        rec->cr.cr_index, cs->cs_startrec);
1917                 RETURN(0);
1918         }
1919
1920         CDEBUG(D_HSM, LPU64" %02d%-5s "LPU64" 0x%x t="DFID" p="DFID" %.*s\n",
1921                rec->cr.cr_index, rec->cr.cr_type,
1922                changelog_type2str(rec->cr.cr_type), rec->cr.cr_time,
1923                rec->cr.cr_flags & CLF_FLAGMASK,
1924                PFID(&rec->cr.cr_tfid), PFID(&rec->cr.cr_pfid),
1925                rec->cr.cr_namelen, changelog_rec_name(&rec->cr));
1926
1927         len = sizeof(*lh) + changelog_rec_size(&rec->cr) + rec->cr.cr_namelen;
1928
1929         /* Set up the message */
1930         lh = changelog_kuc_hdr(cs->cs_buf, len, cs->cs_flags);
1931         memcpy(lh + 1, &rec->cr, len - sizeof(*lh));
1932
1933         rc = libcfs_kkuc_msg_put(cs->cs_fp, lh);
1934         CDEBUG(D_HSM, "kucmsg fp %p len %zu rc %d\n", cs->cs_fp, len, rc);
1935
1936         RETURN(rc);
1937 }
1938
1939 static int mdc_changelog_send_thread(void *csdata)
1940 {
1941         struct changelog_show   *cs = csdata;
1942         struct llog_ctxt        *ctxt = NULL;
1943         struct llog_handle      *llh = NULL;
1944         struct kuc_hdr          *kuch;
1945         enum llog_flag           flags = LLOG_F_IS_CAT;
1946         int                      rc;
1947
1948         CDEBUG(D_HSM, "changelog to fp=%p start "LPU64"\n",
1949                cs->cs_fp, cs->cs_startrec);
1950
1951         OBD_ALLOC(cs->cs_buf, KUC_CHANGELOG_MSG_MAXSIZE);
1952         if (cs->cs_buf == NULL)
1953                 GOTO(out, rc = -ENOMEM);
1954
1955         /* Set up the remote catalog handle */
1956         ctxt = llog_get_context(cs->cs_obd, LLOG_CHANGELOG_REPL_CTXT);
1957         if (ctxt == NULL)
1958                 GOTO(out, rc = -ENOENT);
1959         rc = llog_open(NULL, ctxt, &llh, NULL, CHANGELOG_CATALOG,
1960                        LLOG_OPEN_EXISTS);
1961         if (rc) {
1962                 CERROR("%s: fail to open changelog catalog: rc = %d\n",
1963                        cs_obd_name(cs), rc);
1964                 GOTO(out, rc);
1965         }
1966
1967         if (cs->cs_flags & CHANGELOG_FLAG_JOBID)
1968                 flags |= LLOG_F_EXT_JOBID;
1969
1970         rc = llog_init_handle(NULL, llh, flags, NULL);
1971         if (rc) {
1972                 CERROR("llog_init_handle failed %d\n", rc);
1973                 GOTO(out, rc);
1974         }
1975
1976         rc = llog_cat_process(NULL, llh, changelog_kkuc_cb, cs, 0, 0);
1977
1978         /* Send EOF no matter what our result */
1979         kuch = changelog_kuc_hdr(cs->cs_buf, sizeof(*kuch), cs->cs_flags);
1980         kuch->kuc_msgtype = CL_EOF;
1981         libcfs_kkuc_msg_put(cs->cs_fp, kuch);
1982
1983 out:
1984         fput(cs->cs_fp);
1985         if (llh)
1986                 llog_cat_close(NULL, llh);
1987         if (ctxt)
1988                 llog_ctxt_put(ctxt);
1989         if (cs->cs_buf)
1990                 OBD_FREE(cs->cs_buf, KUC_CHANGELOG_MSG_MAXSIZE);
1991         OBD_FREE_PTR(cs);
1992         return rc;
1993 }
1994
1995 static int mdc_ioc_changelog_send(struct obd_device *obd,
1996                                   struct ioc_changelog *icc)
1997 {
1998         struct changelog_show *cs;
1999         struct task_struct *task;
2000         int rc;
2001
2002         /* Freed in mdc_changelog_send_thread */
2003         OBD_ALLOC_PTR(cs);
2004         if (!cs)
2005                 return -ENOMEM;
2006
2007         cs->cs_obd = obd;
2008         cs->cs_startrec = icc->icc_recno;
2009         /* matching fput in mdc_changelog_send_thread */
2010         cs->cs_fp = fget(icc->icc_id);
2011         cs->cs_flags = icc->icc_flags;
2012
2013         /*
2014          * New thread because we should return to user app before
2015          * writing into our pipe
2016          */
2017         task = kthread_run(mdc_changelog_send_thread, cs,
2018                            "mdc_clg_send_thread");
2019         if (IS_ERR(task)) {
2020                 rc = PTR_ERR(task);
2021                 CERROR("%s: cannot start changelog thread: rc = %d\n",
2022                        cs_obd_name(cs), rc);
2023                 OBD_FREE_PTR(cs);
2024         } else {
2025                 rc = 0;
2026                 CDEBUG(D_HSM, "%s: started changelog thread\n",
2027                        cs_obd_name(cs));
2028         }
2029
2030         return rc;
2031 }
2032
2033 static int mdc_ioc_hsm_ct_start(struct obd_export *exp,
2034                                 struct lustre_kernelcomm *lk);
2035
2036 static int mdc_quotactl(struct obd_device *unused, struct obd_export *exp,
2037                         struct obd_quotactl *oqctl)
2038 {
2039         struct ptlrpc_request   *req;
2040         struct obd_quotactl     *oqc;
2041         int                      rc;
2042         ENTRY;
2043
2044         req = ptlrpc_request_alloc_pack(class_exp2cliimp(exp),
2045                                         &RQF_MDS_QUOTACTL, LUSTRE_MDS_VERSION,
2046                                         MDS_QUOTACTL);
2047         if (req == NULL)
2048                 RETURN(-ENOMEM);
2049
2050         oqc = req_capsule_client_get(&req->rq_pill, &RMF_OBD_QUOTACTL);
2051         *oqc = *oqctl;
2052
2053         ptlrpc_request_set_replen(req);
2054         ptlrpc_at_set_req_timeout(req);
2055         req->rq_no_resend = 1;
2056
2057         rc = ptlrpc_queue_wait(req);
2058         if (rc)
2059                 CERROR("ptlrpc_queue_wait failed, rc: %d\n", rc);
2060
2061         if (req->rq_repmsg &&
2062             (oqc = req_capsule_server_get(&req->rq_pill, &RMF_OBD_QUOTACTL))) {
2063                 *oqctl = *oqc;
2064         } else if (!rc) {
2065                 CERROR ("Can't unpack obd_quotactl\n");
2066                 rc = -EPROTO;
2067         }
2068         ptlrpc_req_finished(req);
2069
2070         RETURN(rc);
2071 }
2072
2073 static int mdc_ioc_swap_layouts(struct obd_export *exp,
2074                                 struct md_op_data *op_data)
2075 {
2076         struct list_head cancels = LIST_HEAD_INIT(cancels);
2077         struct ptlrpc_request   *req;
2078         int                      rc, count;
2079         struct mdc_swap_layouts *msl, *payload;
2080         ENTRY;
2081
2082         msl = op_data->op_data;
2083
2084         /* When the MDT will get the MDS_SWAP_LAYOUTS RPC the
2085          * first thing it will do is to cancel the 2 layout
2086          * locks held by this client.
2087          * So the client must cancel its layout locks on the 2 fids
2088          * with the request RPC to avoid extra RPC round trips.
2089          */
2090         count = mdc_resource_get_unused(exp, &op_data->op_fid1, &cancels,
2091                                         LCK_EX, MDS_INODELOCK_LAYOUT |
2092                                         MDS_INODELOCK_XATTR);
2093         count += mdc_resource_get_unused(exp, &op_data->op_fid2, &cancels,
2094                                          LCK_EX, MDS_INODELOCK_LAYOUT |
2095                                          MDS_INODELOCK_XATTR);
2096
2097         req = ptlrpc_request_alloc(class_exp2cliimp(exp),
2098                                    &RQF_MDS_SWAP_LAYOUTS);
2099         if (req == NULL) {
2100                 ldlm_lock_list_put(&cancels, l_bl_ast, count);
2101                 RETURN(-ENOMEM);
2102         }
2103
2104         mdc_set_capa_size(req, &RMF_CAPA1, op_data->op_capa1);
2105         mdc_set_capa_size(req, &RMF_CAPA2, op_data->op_capa2);
2106
2107         rc = mdc_prep_elc_req(exp, req, MDS_SWAP_LAYOUTS, &cancels, count);
2108         if (rc) {
2109                 ptlrpc_request_free(req);
2110                 RETURN(rc);
2111         }
2112
2113         mdc_swap_layouts_pack(req, op_data);
2114
2115         payload = req_capsule_client_get(&req->rq_pill, &RMF_SWAP_LAYOUTS);
2116         LASSERT(payload);
2117
2118         *payload = *msl;
2119
2120         ptlrpc_request_set_replen(req);
2121
2122         rc = ptlrpc_queue_wait(req);
2123         if (rc)
2124                 GOTO(out, rc);
2125         EXIT;
2126
2127 out:
2128         ptlrpc_req_finished(req);
2129         return rc;
2130 }
2131
2132 static int mdc_iocontrol(unsigned int cmd, struct obd_export *exp, int len,
2133                          void *karg, void __user *uarg)
2134 {
2135         struct obd_device *obd = exp->exp_obd;
2136         struct obd_ioctl_data *data = karg;
2137         struct obd_import *imp = obd->u.cli.cl_import;
2138         int rc;
2139         ENTRY;
2140
2141         if (!try_module_get(THIS_MODULE)) {
2142                 CERROR("%s: cannot get module '%s'\n", obd->obd_name,
2143                        module_name(THIS_MODULE));
2144                 return -EINVAL;
2145         }
2146         switch (cmd) {
2147         case OBD_IOC_CHANGELOG_SEND:
2148                 rc = mdc_ioc_changelog_send(obd, karg);
2149                 GOTO(out, rc);
2150         case OBD_IOC_CHANGELOG_CLEAR: {
2151                 struct ioc_changelog *icc = karg;
2152                 struct changelog_setinfo cs =
2153                         {.cs_recno = icc->icc_recno, .cs_id = icc->icc_id};
2154                 rc = obd_set_info_async(NULL, exp, strlen(KEY_CHANGELOG_CLEAR),
2155                                         KEY_CHANGELOG_CLEAR, sizeof(cs), &cs,
2156                                         NULL);
2157                 GOTO(out, rc);
2158         }
2159         case OBD_IOC_FID2PATH:
2160                 rc = mdc_ioc_fid2path(exp, karg);
2161                 GOTO(out, rc);
2162         case LL_IOC_HSM_CT_START:
2163                 rc = mdc_ioc_hsm_ct_start(exp, karg);
2164                 /* ignore if it was already registered on this MDS. */
2165                 if (rc == -EEXIST)
2166                         rc = 0;
2167                 GOTO(out, rc);
2168         case LL_IOC_HSM_PROGRESS:
2169                 rc = mdc_ioc_hsm_progress(exp, karg);
2170                 GOTO(out, rc);
2171         case LL_IOC_HSM_STATE_GET:
2172                 rc = mdc_ioc_hsm_state_get(exp, karg);
2173                 GOTO(out, rc);
2174         case LL_IOC_HSM_STATE_SET:
2175                 rc = mdc_ioc_hsm_state_set(exp, karg);
2176                 GOTO(out, rc);
2177         case LL_IOC_HSM_ACTION:
2178                 rc = mdc_ioc_hsm_current_action(exp, karg);
2179                 GOTO(out, rc);
2180         case LL_IOC_HSM_REQUEST:
2181                 rc = mdc_ioc_hsm_request(exp, karg);
2182                 GOTO(out, rc);
2183         case OBD_IOC_CLIENT_RECOVER:
2184                 rc = ptlrpc_recover_import(imp, data->ioc_inlbuf1, 0);
2185                 if (rc < 0)
2186                         GOTO(out, rc);
2187                 GOTO(out, rc = 0);
2188         case IOC_OSC_SET_ACTIVE:
2189                 rc = ptlrpc_set_import_active(imp, data->ioc_offset);
2190                 GOTO(out, rc);
2191         case OBD_IOC_PING_TARGET:
2192                 rc = ptlrpc_obd_ping(obd);
2193                 GOTO(out, rc);
2194         /*
2195          * Normally IOC_OBD_STATFS, OBD_IOC_QUOTACTL iocontrol are handled by
2196          * LMV instead of MDC. But when the cluster is upgraded from 1.8,
2197          * there'd be no LMV layer thus we might be called here. Eventually
2198          * this code should be removed.
2199          * bz20731, LU-592.
2200          */
2201         case IOC_OBD_STATFS: {
2202                 struct obd_statfs stat_buf = {0};
2203
2204                 if (*((__u32 *) data->ioc_inlbuf2) != 0)
2205                         GOTO(out, rc = -ENODEV);
2206
2207                 /* copy UUID */
2208                 if (copy_to_user(data->ioc_pbuf2, obd2cli_tgt(obd),
2209                                  min((int)data->ioc_plen2,
2210                                      (int)sizeof(struct obd_uuid))))
2211                         GOTO(out, rc = -EFAULT);
2212
2213                 rc = mdc_statfs(NULL, obd->obd_self_export, &stat_buf,
2214                                 cfs_time_shift_64(-OBD_STATFS_CACHE_SECONDS),
2215                                 0);
2216                 if (rc != 0)
2217                         GOTO(out, rc);
2218
2219                 if (copy_to_user(data->ioc_pbuf1, &stat_buf,
2220                                      min((int) data->ioc_plen1,
2221                                          (int) sizeof(stat_buf))))
2222                         GOTO(out, rc = -EFAULT);
2223
2224                 GOTO(out, rc = 0);
2225         }
2226         case OBD_IOC_QUOTACTL: {
2227                 struct if_quotactl *qctl = karg;
2228                 struct obd_quotactl *oqctl;
2229
2230                 OBD_ALLOC_PTR(oqctl);
2231                 if (oqctl == NULL)
2232                         GOTO(out, rc = -ENOMEM);
2233
2234                 QCTL_COPY(oqctl, qctl);
2235                 rc = obd_quotactl(exp, oqctl);
2236                 if (rc == 0) {
2237                         QCTL_COPY(qctl, oqctl);
2238                         qctl->qc_valid = QC_MDTIDX;
2239                         qctl->obd_uuid = obd->u.cli.cl_target_uuid;
2240                 }
2241
2242                 OBD_FREE_PTR(oqctl);
2243                 GOTO(out, rc);
2244         }
2245         case LL_IOC_GET_CONNECT_FLAGS:
2246                 if (copy_to_user(uarg, exp_connect_flags_ptr(exp),
2247                                  sizeof(*exp_connect_flags_ptr(exp))))
2248                         GOTO(out, rc = -EFAULT);
2249
2250                 GOTO(out, rc = 0);
2251         case LL_IOC_LOV_SWAP_LAYOUTS:
2252                 rc = mdc_ioc_swap_layouts(exp, karg);
2253                 GOTO(out, rc);
2254         default:
2255                 CERROR("unrecognised ioctl: cmd = %#x\n", cmd);
2256                 GOTO(out, rc = -ENOTTY);
2257         }
2258 out:
2259         module_put(THIS_MODULE);
2260
2261         return rc;
2262 }
2263
2264 static int mdc_get_info_rpc(struct obd_export *exp,
2265                             u32 keylen, void *key,
2266                             u32 vallen, void *val)
2267 {
2268         struct obd_import      *imp = class_exp2cliimp(exp);
2269         struct ptlrpc_request  *req;
2270         char                   *tmp;
2271         int                     rc = -EINVAL;
2272         ENTRY;
2273
2274         req = ptlrpc_request_alloc(imp, &RQF_MDS_GET_INFO);
2275         if (req == NULL)
2276                 RETURN(-ENOMEM);
2277
2278         req_capsule_set_size(&req->rq_pill, &RMF_GETINFO_KEY,
2279                              RCL_CLIENT, keylen);
2280         req_capsule_set_size(&req->rq_pill, &RMF_GETINFO_VALLEN,
2281                              RCL_CLIENT, sizeof(vallen));
2282
2283         rc = ptlrpc_request_pack(req, LUSTRE_MDS_VERSION, MDS_GET_INFO);
2284         if (rc) {
2285                 ptlrpc_request_free(req);
2286                 RETURN(rc);
2287         }
2288
2289         tmp = req_capsule_client_get(&req->rq_pill, &RMF_GETINFO_KEY);
2290         memcpy(tmp, key, keylen);
2291         tmp = req_capsule_client_get(&req->rq_pill, &RMF_GETINFO_VALLEN);
2292         memcpy(tmp, &vallen, sizeof(vallen));
2293
2294         req_capsule_set_size(&req->rq_pill, &RMF_GETINFO_VAL,
2295                              RCL_SERVER, vallen);
2296         ptlrpc_request_set_replen(req);
2297
2298         rc = ptlrpc_queue_wait(req);
2299         /* -EREMOTE means the get_info result is partial, and it needs to
2300          * continue on another MDT, see fid2path part in lmv_iocontrol */
2301         if (rc == 0 || rc == -EREMOTE) {
2302                 tmp = req_capsule_server_get(&req->rq_pill, &RMF_GETINFO_VAL);
2303                 memcpy(val, tmp, vallen);
2304                 if (ptlrpc_rep_need_swab(req)) {
2305                         if (KEY_IS(KEY_FID2PATH))
2306                                 lustre_swab_fid2path(val);
2307                 }
2308         }
2309         ptlrpc_req_finished(req);
2310
2311         RETURN(rc);
2312 }
2313
2314 static void lustre_swab_hai(struct hsm_action_item *h)
2315 {
2316         __swab32s(&h->hai_len);
2317         __swab32s(&h->hai_action);
2318         lustre_swab_lu_fid(&h->hai_fid);
2319         lustre_swab_lu_fid(&h->hai_dfid);
2320         __swab64s(&h->hai_cookie);
2321         __swab64s(&h->hai_extent.offset);
2322         __swab64s(&h->hai_extent.length);
2323         __swab64s(&h->hai_gid);
2324 }
2325
2326 static void lustre_swab_hal(struct hsm_action_list *h)
2327 {
2328         struct hsm_action_item  *hai;
2329         __u32                    i;
2330
2331         __swab32s(&h->hal_version);
2332         __swab32s(&h->hal_count);
2333         __swab32s(&h->hal_archive_id);
2334         __swab64s(&h->hal_flags);
2335         hai = hai_first(h);
2336         for (i = 0; i < h->hal_count; i++, hai = hai_next(hai))
2337                 lustre_swab_hai(hai);
2338 }
2339
2340 static void lustre_swab_kuch(struct kuc_hdr *l)
2341 {
2342         __swab16s(&l->kuc_magic);
2343         /* __u8 l->kuc_transport */
2344         __swab16s(&l->kuc_msgtype);
2345         __swab16s(&l->kuc_msglen);
2346 }
2347
2348 static int mdc_ioc_hsm_ct_start(struct obd_export *exp,
2349                                 struct lustre_kernelcomm *lk)
2350 {
2351         struct obd_import  *imp = class_exp2cliimp(exp);
2352         __u32               archive = lk->lk_data;
2353         int                 rc = 0;
2354
2355         if (lk->lk_group != KUC_GRP_HSM) {
2356                 CERROR("Bad copytool group %d\n", lk->lk_group);
2357                 return -EINVAL;
2358         }
2359
2360         CDEBUG(D_HSM, "CT start r%d w%d u%d g%d f%#x\n", lk->lk_rfd, lk->lk_wfd,
2361                lk->lk_uid, lk->lk_group, lk->lk_flags);
2362
2363         if (lk->lk_flags & LK_FLG_STOP) {
2364                 /* Unregister with the coordinator */
2365                 rc = mdc_ioc_hsm_ct_unregister(imp);
2366         } else {
2367                 rc = mdc_ioc_hsm_ct_register(imp, archive);
2368         }
2369
2370         return rc;
2371 }
2372
2373 /**
2374  * Send a message to any listening copytools
2375  * @param val KUC message (kuc_hdr + hsm_action_list)
2376  * @param len total length of message
2377  */
2378 static int mdc_hsm_copytool_send(size_t len, void *val)
2379 {
2380         struct kuc_hdr          *lh = (struct kuc_hdr *)val;
2381         struct hsm_action_list  *hal = (struct hsm_action_list *)(lh + 1);
2382         int                      rc;
2383         ENTRY;
2384
2385         if (len < sizeof(*lh) + sizeof(*hal)) {
2386                 CERROR("Short HSM message %zu < %zu\n", len,
2387                        sizeof(*lh) + sizeof(*hal));
2388                 RETURN(-EPROTO);
2389         }
2390         if (lh->kuc_magic == __swab16(KUC_MAGIC)) {
2391                 lustre_swab_kuch(lh);
2392                 lustre_swab_hal(hal);
2393         } else if (lh->kuc_magic != KUC_MAGIC) {
2394                 CERROR("Bad magic %x!=%x\n", lh->kuc_magic, KUC_MAGIC);
2395                 RETURN(-EPROTO);
2396         }
2397
2398         CDEBUG(D_HSM, " Received message mg=%x t=%d m=%d l=%d actions=%d "
2399                "on %s\n",
2400                lh->kuc_magic, lh->kuc_transport, lh->kuc_msgtype,
2401                lh->kuc_msglen, hal->hal_count, hal->hal_fsname);
2402
2403         /* Broadcast to HSM listeners */
2404         rc = libcfs_kkuc_group_put(KUC_GRP_HSM, lh);
2405
2406         RETURN(rc);
2407 }
2408
2409 /**
2410  * callback function passed to kuc for re-registering each HSM copytool
2411  * running on MDC, after MDT shutdown/recovery.
2412  * @param data copytool registration data
2413  * @param cb_arg callback argument (obd_import)
2414  */
2415 static int mdc_hsm_ct_reregister(void *data, void *cb_arg)
2416 {
2417         struct kkuc_ct_data     *kcd = data;
2418         struct obd_import       *imp = (struct obd_import *)cb_arg;
2419         int                      rc;
2420
2421         if (kcd == NULL || kcd->kcd_magic != KKUC_CT_DATA_MAGIC)
2422                 return -EPROTO;
2423
2424         if (!obd_uuid_equals(&kcd->kcd_uuid, &imp->imp_obd->obd_uuid))
2425                 return 0;
2426
2427         CDEBUG(D_HA, "%s: recover copytool registration to MDT (archive=%#x)\n",
2428                imp->imp_obd->obd_name, kcd->kcd_archive);
2429         rc = mdc_ioc_hsm_ct_register(imp, kcd->kcd_archive);
2430
2431         /* ignore error if the copytool is already registered */
2432         return (rc == -EEXIST) ? 0 : rc;
2433 }
2434
2435 /**
2436  * Re-establish all kuc contexts with MDT
2437  * after MDT shutdown/recovery.
2438  */
2439 static int mdc_kuc_reregister(struct obd_import *imp)
2440 {
2441         /* re-register HSM agents */
2442         return libcfs_kkuc_group_foreach(KUC_GRP_HSM, mdc_hsm_ct_reregister,
2443                                          (void *)imp);
2444 }
2445
2446 static int mdc_set_info_async(const struct lu_env *env,
2447                               struct obd_export *exp,
2448                               u32 keylen, void *key,
2449                               u32 vallen, void *val,
2450                               struct ptlrpc_request_set *set)
2451 {
2452         struct obd_import       *imp = class_exp2cliimp(exp);
2453         int                      rc;
2454         ENTRY;
2455
2456         if (KEY_IS(KEY_READ_ONLY)) {
2457                 if (vallen != sizeof(int))
2458                         RETURN(-EINVAL);
2459
2460                 spin_lock(&imp->imp_lock);
2461                 if (*((int *)val)) {
2462                         imp->imp_connect_flags_orig |= OBD_CONNECT_RDONLY;
2463                         imp->imp_connect_data.ocd_connect_flags |=
2464                                                         OBD_CONNECT_RDONLY;
2465                 } else {
2466                         imp->imp_connect_flags_orig &= ~OBD_CONNECT_RDONLY;
2467                         imp->imp_connect_data.ocd_connect_flags &=
2468                                                         ~OBD_CONNECT_RDONLY;
2469                 }
2470                 spin_unlock(&imp->imp_lock);
2471
2472                 rc = do_set_info_async(imp, MDS_SET_INFO, LUSTRE_MDS_VERSION,
2473                                        keylen, key, vallen, val, set);
2474                 RETURN(rc);
2475         }
2476         if (KEY_IS(KEY_SPTLRPC_CONF)) {
2477                 sptlrpc_conf_client_adapt(exp->exp_obd);
2478                 RETURN(0);
2479         }
2480         if (KEY_IS(KEY_FLUSH_CTX)) {
2481                 sptlrpc_import_flush_my_ctx(imp);
2482                 RETURN(0);
2483         }
2484         if (KEY_IS(KEY_CHANGELOG_CLEAR)) {
2485                 rc = do_set_info_async(imp, MDS_SET_INFO, LUSTRE_MDS_VERSION,
2486                                        keylen, key, vallen, val, set);
2487                 RETURN(rc);
2488         }
2489         if (KEY_IS(KEY_HSM_COPYTOOL_SEND)) {
2490                 rc = mdc_hsm_copytool_send(vallen, val);
2491                 RETURN(rc);
2492         }
2493
2494         if (KEY_IS(KEY_DEFAULT_EASIZE)) {
2495                 __u32 *default_easize = val;
2496
2497                 exp->exp_obd->u.cli.cl_default_mds_easize = *default_easize;
2498                 RETURN(0);
2499         }
2500
2501         CERROR("Unknown key %s\n", (char *)key);
2502         RETURN(-EINVAL);
2503 }
2504
2505 static int mdc_get_info(const struct lu_env *env, struct obd_export *exp,
2506                         __u32 keylen, void *key, __u32 *vallen, void *val)
2507 {
2508         int rc = -EINVAL;
2509
2510         if (KEY_IS(KEY_MAX_EASIZE)) {
2511                 __u32 mdsize, *max_easize;
2512
2513                 if (*vallen != sizeof(int))
2514                         RETURN(-EINVAL);
2515                 mdsize = *(__u32 *)val;
2516                 if (mdsize > exp->exp_obd->u.cli.cl_max_mds_easize)
2517                         exp->exp_obd->u.cli.cl_max_mds_easize = mdsize;
2518                 max_easize = val;
2519                 *max_easize = exp->exp_obd->u.cli.cl_max_mds_easize;
2520                 RETURN(0);
2521         } else if (KEY_IS(KEY_DEFAULT_EASIZE)) {
2522                 __u32 *default_easize;
2523
2524                 if (*vallen != sizeof(int))
2525                         RETURN(-EINVAL);
2526                 default_easize = val;
2527                 *default_easize = exp->exp_obd->u.cli.cl_default_mds_easize;
2528                 RETURN(0);
2529         } else if (KEY_IS(KEY_CONN_DATA)) {
2530                 struct obd_import *imp = class_exp2cliimp(exp);
2531                 struct obd_connect_data *data = val;
2532
2533                 if (*vallen != sizeof(*data))
2534                         RETURN(-EINVAL);
2535
2536                 *data = imp->imp_connect_data;
2537                 RETURN(0);
2538         } else if (KEY_IS(KEY_TGT_COUNT)) {
2539                 *((__u32 *)val) = 1;
2540                 RETURN(0);
2541         }
2542
2543         rc = mdc_get_info_rpc(exp, keylen, key, *vallen, val);
2544
2545         RETURN(rc);
2546 }
2547
2548 static int mdc_fsync(struct obd_export *exp, const struct lu_fid *fid,
2549                      struct obd_capa *oc, struct ptlrpc_request **request)
2550 {
2551         struct ptlrpc_request *req;
2552         int                    rc;
2553         ENTRY;
2554
2555         *request = NULL;
2556         req = ptlrpc_request_alloc(class_exp2cliimp(exp), &RQF_MDS_SYNC);
2557         if (req == NULL)
2558                 RETURN(-ENOMEM);
2559
2560         mdc_set_capa_size(req, &RMF_CAPA1, oc);
2561
2562         rc = ptlrpc_request_pack(req, LUSTRE_MDS_VERSION, MDS_SYNC);
2563         if (rc) {
2564                 ptlrpc_request_free(req);
2565                 RETURN(rc);
2566         }
2567
2568         mdc_pack_body(req, fid, oc, 0, 0, -1, 0);
2569
2570         ptlrpc_request_set_replen(req);
2571
2572         rc = ptlrpc_queue_wait(req);
2573         if (rc)
2574                 ptlrpc_req_finished(req);
2575         else
2576                 *request = req;
2577         RETURN(rc);
2578 }
2579
2580 static int mdc_import_event(struct obd_device *obd, struct obd_import *imp,
2581                             enum obd_import_event event)
2582 {
2583         int rc = 0;
2584
2585         LASSERT(imp->imp_obd == obd);
2586
2587         switch (event) {
2588         case IMP_EVENT_DISCON: {
2589 #if 0
2590                 /* XXX Pass event up to OBDs stack. used only for FLD now */
2591                 rc = obd_notify_observer(obd, obd, OBD_NOTIFY_DISCON, NULL);
2592 #endif
2593                 break;
2594         }
2595         case IMP_EVENT_INACTIVE: {
2596                 struct client_obd *cli = &obd->u.cli;
2597                 /*
2598                  * Flush current sequence to make client obtain new one
2599                  * from server in case of disconnect/reconnect.
2600                  */
2601                 if (cli->cl_seq != NULL)
2602                         seq_client_flush(cli->cl_seq);
2603
2604                 rc = obd_notify_observer(obd, obd, OBD_NOTIFY_INACTIVE, NULL);
2605                 break;
2606         }
2607         case IMP_EVENT_INVALIDATE: {
2608                 struct ldlm_namespace *ns = obd->obd_namespace;
2609
2610                 ldlm_namespace_cleanup(ns, LDLM_FL_LOCAL_ONLY);
2611
2612                 break;
2613         }
2614         case IMP_EVENT_ACTIVE:
2615                 rc = obd_notify_observer(obd, obd, OBD_NOTIFY_ACTIVE, NULL);
2616                 /* redo the kuc registration after reconnecting */
2617                 if (rc == 0)
2618                         rc = mdc_kuc_reregister(imp);
2619                 break;
2620         case IMP_EVENT_OCD:
2621                 rc = obd_notify_observer(obd, obd, OBD_NOTIFY_OCD, NULL);
2622                 break;
2623         case IMP_EVENT_DEACTIVATE:
2624         case IMP_EVENT_ACTIVATE:
2625                 break;
2626         default:
2627                 CERROR("Unknown import event %x\n", event);
2628                 LBUG();
2629         }
2630         RETURN(rc);
2631 }
2632
2633 int mdc_fid_alloc(const struct lu_env *env, struct obd_export *exp,
2634                   struct lu_fid *fid, struct md_op_data *op_data)
2635 {
2636         struct client_obd *cli = &exp->exp_obd->u.cli;
2637         struct lu_client_seq *seq = cli->cl_seq;
2638         ENTRY;
2639         RETURN(seq_client_alloc_fid(env, seq, fid));
2640 }
2641
2642 static struct obd_uuid *mdc_get_uuid(struct obd_export *exp)
2643 {
2644         struct client_obd *cli = &exp->exp_obd->u.cli;
2645         return &cli->cl_target_uuid;
2646 }
2647
2648 /**
2649  * Determine whether the lock can be canceled before replaying it during
2650  * recovery, non zero value will be return if the lock can be canceled,
2651  * or zero returned for not
2652  */
2653 static int mdc_cancel_weight(struct ldlm_lock *lock)
2654 {
2655         if (lock->l_resource->lr_type != LDLM_IBITS)
2656                 RETURN(0);
2657
2658         /* FIXME: if we ever get into a situation where there are too many
2659          * opened files with open locks on a single node, then we really
2660          * should replay these open locks to reget it */
2661         if (lock->l_policy_data.l_inodebits.bits & MDS_INODELOCK_OPEN)
2662                 RETURN(0);
2663
2664         RETURN(1);
2665 }
2666
2667 static int mdc_resource_inode_free(struct ldlm_resource *res)
2668 {
2669         if (res->lr_lvb_inode)
2670                 res->lr_lvb_inode = NULL;
2671
2672         return 0;
2673 }
2674
2675 static struct ldlm_valblock_ops inode_lvbo = {
2676         .lvbo_free = mdc_resource_inode_free
2677 };
2678
2679 static int mdc_llog_init(struct obd_device *obd)
2680 {
2681         struct obd_llog_group   *olg = &obd->obd_olg;
2682         struct llog_ctxt        *ctxt;
2683         int                      rc;
2684
2685         ENTRY;
2686
2687         rc = llog_setup(NULL, obd, olg, LLOG_CHANGELOG_REPL_CTXT, obd,
2688                         &llog_client_ops);
2689         if (rc < 0)
2690                 RETURN(rc);
2691
2692         ctxt = llog_group_get_ctxt(olg, LLOG_CHANGELOG_REPL_CTXT);
2693         llog_initiator_connect(ctxt);
2694         llog_ctxt_put(ctxt);
2695
2696         RETURN(0);
2697 }
2698
2699 static void mdc_llog_finish(struct obd_device *obd)
2700 {
2701         struct llog_ctxt *ctxt;
2702
2703         ENTRY;
2704
2705         ctxt = llog_get_context(obd, LLOG_CHANGELOG_REPL_CTXT);
2706         if (ctxt != NULL)
2707                 llog_cleanup(NULL, ctxt);
2708
2709         EXIT;
2710 }
2711
2712 static int mdc_setup(struct obd_device *obd, struct lustre_cfg *cfg)
2713 {
2714         struct client_obd               *cli = &obd->u.cli;
2715         int                             rc;
2716         ENTRY;
2717
2718         OBD_ALLOC(cli->cl_rpc_lock, sizeof (*cli->cl_rpc_lock));
2719         if (!cli->cl_rpc_lock)
2720                 RETURN(-ENOMEM);
2721         mdc_init_rpc_lock(cli->cl_rpc_lock);
2722
2723         rc = ptlrpcd_addref();
2724         if (rc < 0)
2725                 GOTO(err_rpc_lock, rc);
2726
2727         OBD_ALLOC(cli->cl_close_lock, sizeof (*cli->cl_close_lock));
2728         if (!cli->cl_close_lock)
2729                 GOTO(err_ptlrpcd_decref, rc = -ENOMEM);
2730         mdc_init_rpc_lock(cli->cl_close_lock);
2731
2732         rc = client_obd_setup(obd, cfg);
2733         if (rc)
2734                 GOTO(err_close_lock, rc);
2735 #ifdef CONFIG_PROC_FS
2736         obd->obd_vars = lprocfs_mdc_obd_vars;
2737         lprocfs_obd_setup(obd);
2738         lprocfs_alloc_md_stats(obd, 0);
2739 #endif
2740         sptlrpc_lprocfs_cliobd_attach(obd);
2741         ptlrpc_lprocfs_register_obd(obd);
2742
2743         ns_register_cancel(obd->obd_namespace, mdc_cancel_weight);
2744
2745         obd->obd_namespace->ns_lvbo = &inode_lvbo;
2746
2747         rc = mdc_llog_init(obd);
2748         if (rc) {
2749                 mdc_cleanup(obd);
2750                 CERROR("failed to setup llogging subsystems\n");
2751                 RETURN(rc);
2752         }
2753
2754         spin_lock_init(&cli->cl_mod_rpcs_lock);
2755         cli->cl_max_mod_rpcs_in_flight = OBD_MAX_RIF_DEFAULT - 1;
2756
2757         RETURN(rc);
2758
2759 err_close_lock:
2760         OBD_FREE(cli->cl_close_lock, sizeof (*cli->cl_close_lock));
2761 err_ptlrpcd_decref:
2762         ptlrpcd_decref();
2763 err_rpc_lock:
2764         OBD_FREE(cli->cl_rpc_lock, sizeof (*cli->cl_rpc_lock));
2765         RETURN(rc);
2766 }
2767
2768 /* Initialize the default and maximum LOV EA sizes.  This allows
2769  * us to make MDS RPCs with large enough reply buffers to hold a default
2770  * sized EA without having to calculate this (via a call into the
2771  * LOV + OSCs) each time we make an RPC.  The maximum size is also tracked
2772  * but not used to avoid wastefully vmalloc()'ing large reply buffers when
2773  * a large number of stripes is possible.  If a larger reply buffer is
2774  * required it will be reallocated in the ptlrpc layer due to overflow.
2775  */
2776 static int mdc_init_ea_size(struct obd_export *exp, __u32 easize,
2777                             __u32 def_easize)
2778 {
2779         struct obd_device *obd = exp->exp_obd;
2780         struct client_obd *cli = &obd->u.cli;
2781         ENTRY;
2782
2783         if (cli->cl_max_mds_easize < easize)
2784                 cli->cl_max_mds_easize = easize;
2785
2786         if (cli->cl_default_mds_easize < def_easize)
2787                 cli->cl_default_mds_easize = def_easize;
2788
2789         RETURN(0);
2790 }
2791
2792 static int mdc_precleanup(struct obd_device *obd, enum obd_cleanup_stage stage)
2793 {
2794         int rc = 0;
2795         ENTRY;
2796
2797         switch (stage) {
2798         case OBD_CLEANUP_EARLY:
2799                 break;
2800         case OBD_CLEANUP_EXPORTS:
2801                 /* Failsafe, ok if racy */
2802                 if (obd->obd_type->typ_refcnt <= 1)
2803                         libcfs_kkuc_group_rem(0, KUC_GRP_HSM, NULL);
2804
2805                 obd_cleanup_client_import(obd);
2806                 ptlrpc_lprocfs_unregister_obd(obd);
2807                 lprocfs_obd_cleanup(obd);
2808                 lprocfs_free_md_stats(obd);
2809                 mdc_llog_finish(obd);
2810                 break;
2811         }
2812         RETURN(rc);
2813 }
2814
2815 static int mdc_cleanup(struct obd_device *obd)
2816 {
2817         struct client_obd *cli = &obd->u.cli;
2818
2819         OBD_FREE(cli->cl_rpc_lock, sizeof (*cli->cl_rpc_lock));
2820         OBD_FREE(cli->cl_close_lock, sizeof (*cli->cl_close_lock));
2821
2822         ptlrpcd_decref();
2823
2824         return client_obd_cleanup(obd);
2825 }
2826
2827 static int mdc_process_config(struct obd_device *obd, size_t len, void *buf)
2828 {
2829         struct lustre_cfg *lcfg = buf;
2830         int rc = class_process_proc_param(PARAM_MDC, obd->obd_vars, lcfg, obd);
2831         return (rc > 0 ? 0: rc);
2832 }
2833
2834
2835 /* get remote permission for current user on fid */
2836 static int mdc_get_remote_perm(struct obd_export *exp, const struct lu_fid *fid,
2837                                struct obd_capa *oc, __u32 suppgid,
2838                                struct ptlrpc_request **request)
2839 {
2840         struct ptlrpc_request  *req;
2841         int                    rc;
2842         ENTRY;
2843
2844         LASSERT(client_is_remote(exp));
2845
2846         *request = NULL;
2847         req = ptlrpc_request_alloc(class_exp2cliimp(exp), &RQF_MDS_GETATTR);
2848         if (req == NULL)
2849                 RETURN(-ENOMEM);
2850
2851         mdc_set_capa_size(req, &RMF_CAPA1, oc);
2852
2853         rc = ptlrpc_request_pack(req, LUSTRE_MDS_VERSION, MDS_GETATTR);
2854         if (rc) {
2855                 ptlrpc_request_free(req);
2856                 RETURN(rc);
2857         }
2858
2859         mdc_pack_body(req, fid, oc, OBD_MD_FLRMTPERM, 0, suppgid, 0);
2860
2861         req_capsule_set_size(&req->rq_pill, &RMF_ACL, RCL_SERVER,
2862                              sizeof(struct mdt_remote_perm));
2863
2864         ptlrpc_request_set_replen(req);
2865
2866         rc = ptlrpc_queue_wait(req);
2867         if (rc)
2868                 ptlrpc_req_finished(req);
2869         else
2870                 *request = req;
2871         RETURN(rc);
2872 }
2873
2874 static int mdc_interpret_renew_capa(const struct lu_env *env,
2875                                     struct ptlrpc_request *req, void *args,
2876                                     int status)
2877 {
2878         struct mdc_renew_capa_args *ra = args;
2879         struct mdt_body *body = NULL;
2880         struct lustre_capa *capa;
2881         ENTRY;
2882
2883         if (status)
2884                 GOTO(out, capa = ERR_PTR(status));
2885
2886         body = req_capsule_server_get(&req->rq_pill, &RMF_MDT_BODY);
2887         if (body == NULL)
2888                 GOTO(out, capa = ERR_PTR(-EFAULT));
2889
2890         if ((body->mbo_valid & OBD_MD_FLOSSCAPA) == 0)
2891                 GOTO(out, capa = ERR_PTR(-ENOENT));
2892
2893         capa = req_capsule_server_get(&req->rq_pill, &RMF_CAPA2);
2894         if (!capa)
2895                 GOTO(out, capa = ERR_PTR(-EFAULT));
2896         EXIT;
2897 out:
2898         ra->ra_cb(ra->ra_oc, capa);
2899         return 0;
2900 }
2901
2902 static int mdc_renew_capa(struct obd_export *exp, struct obd_capa *oc,
2903                           renew_capa_cb_t cb)
2904 {
2905         struct ptlrpc_request *req;
2906         struct mdc_renew_capa_args *ra;
2907         ENTRY;
2908
2909         req = ptlrpc_request_alloc_pack(class_exp2cliimp(exp), &RQF_MDS_GETATTR,
2910                                         LUSTRE_MDS_VERSION, MDS_GETATTR);
2911         if (req == NULL)
2912                 RETURN(-ENOMEM);
2913
2914         /* NB, OBD_MD_FLOSSCAPA is set here, but it doesn't necessarily mean the
2915          * capa to renew is oss capa.
2916          */
2917         mdc_pack_body(req, &oc->c_capa.lc_fid, oc, OBD_MD_FLOSSCAPA, 0, -1, 0);
2918         ptlrpc_request_set_replen(req);
2919
2920         CLASSERT(sizeof(*ra) <= sizeof(req->rq_async_args));
2921         ra = ptlrpc_req_async_args(req);
2922         ra->ra_oc = oc;
2923         ra->ra_cb = cb;
2924         req->rq_interpret_reply = mdc_interpret_renew_capa;
2925         ptlrpcd_add_req(req, PDL_POLICY_LOCAL, -1);
2926         RETURN(0);
2927 }
2928
2929 static struct obd_ops mdc_obd_ops = {
2930         .o_owner            = THIS_MODULE,
2931         .o_setup            = mdc_setup,
2932         .o_precleanup       = mdc_precleanup,
2933         .o_cleanup          = mdc_cleanup,
2934         .o_add_conn         = client_import_add_conn,
2935         .o_del_conn         = client_import_del_conn,
2936         .o_connect          = client_connect_import,
2937         .o_disconnect       = client_disconnect_export,
2938         .o_iocontrol        = mdc_iocontrol,
2939         .o_set_info_async   = mdc_set_info_async,
2940         .o_statfs           = mdc_statfs,
2941         .o_fid_init         = client_fid_init,
2942         .o_fid_fini         = client_fid_fini,
2943         .o_fid_alloc        = mdc_fid_alloc,
2944         .o_import_event     = mdc_import_event,
2945         .o_get_info         = mdc_get_info,
2946         .o_process_config   = mdc_process_config,
2947         .o_get_uuid         = mdc_get_uuid,
2948         .o_quotactl         = mdc_quotactl,
2949 };
2950
2951 static struct md_ops mdc_md_ops = {
2952         .m_getstatus        = mdc_getstatus,
2953         .m_null_inode       = mdc_null_inode,
2954         .m_find_cbdata      = mdc_find_cbdata,
2955         .m_close            = mdc_close,
2956         .m_create           = mdc_create,
2957         .m_enqueue          = mdc_enqueue,
2958         .m_getattr          = mdc_getattr,
2959         .m_getattr_name     = mdc_getattr_name,
2960         .m_intent_lock      = mdc_intent_lock,
2961         .m_link             = mdc_link,
2962         .m_rename           = mdc_rename,
2963         .m_setattr          = mdc_setattr,
2964         .m_setxattr         = mdc_setxattr,
2965         .m_getxattr         = mdc_getxattr,
2966         .m_fsync                = mdc_fsync,
2967         .m_read_page            = mdc_read_page,
2968         .m_unlink           = mdc_unlink,
2969         .m_cancel_unused    = mdc_cancel_unused,
2970         .m_init_ea_size     = mdc_init_ea_size,
2971         .m_set_lock_data    = mdc_set_lock_data,
2972         .m_lock_match       = mdc_lock_match,
2973         .m_get_lustre_md    = mdc_get_lustre_md,
2974         .m_free_lustre_md   = mdc_free_lustre_md,
2975         .m_set_open_replay_data = mdc_set_open_replay_data,
2976         .m_clear_open_replay_data = mdc_clear_open_replay_data,
2977         .m_renew_capa       = mdc_renew_capa,
2978         .m_unpack_capa      = mdc_unpack_capa,
2979         .m_get_remote_perm  = mdc_get_remote_perm,
2980         .m_intent_getattr_async = mdc_intent_getattr_async,
2981         .m_revalidate_lock      = mdc_revalidate_lock
2982 };
2983
2984 static int __init mdc_init(void)
2985 {
2986         return class_register_type(&mdc_obd_ops, &mdc_md_ops, true, NULL,
2987                                    LUSTRE_MDC_NAME, NULL);
2988 }
2989
2990 static void /*__exit*/ mdc_exit(void)
2991 {
2992         class_unregister_type(LUSTRE_MDC_NAME);
2993 }
2994
2995 MODULE_AUTHOR("Sun Microsystems, Inc. <http://www.lustre.org/>");
2996 MODULE_DESCRIPTION("Lustre Metadata Client");
2997 MODULE_LICENSE("GPL");
2998
2999 module_init(mdc_init);
3000 module_exit(mdc_exit);