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.gnu.org/licenses/gpl-2.0.html
  19  *
  20  * GPL HEADER END
  21  */
  22 /*
  23  * Copyright (c) 2001, 2010, Oracle and/or its affiliates. All rights reserved.
  24  * Use is subject to license terms.
  25  *
  26  * Copyright (c) 2011, 2017, Intel Corporation.
  27  */
  28 /*
  29  * This file is part of Lustre, http://www.lustre.org/
  30  * Lustre is a trademark of Sun Microsystems, Inc.
  31  */
  32
  33 #define DEBUG_SUBSYSTEM S_MDC
  34
  35 #include <linux/init.h>
  36 #include <linux/kthread.h>
  37 #include <linux/module.h>
  38 #include <linux/pagemap.h>
  39 #include <linux/user_namespace.h>
  40 #include <linux/utsname.h>
  41 #include <linux/delay.h>
  42 #include <linux/uidgid.h>
  43 #include <linux/device.h>
  44
  45 #include <lustre_errno.h>
  46
  47 #include <cl_object.h>
  48 #include <llog_swab.h>
  49 #include <lprocfs_status.h>
  50 #include <lustre_acl.h>
  51 #include <lustre_fid.h>
  52 #include <uapi/linux/lustre/lustre_ioctl.h>
  53 #include <lustre_kernelcomm.h>
  54 #include <lustre_lmv.h>
  55 #include <lustre_log.h>
  56 #include <lustre_swab.h>
  57 #include <obd_class.h>
  58 #include <lustre_osc.h>
  59
  60 #include "mdc_internal.h"
  61
  62 #define REQUEST_MINOR 244
  63
  64 static int mdc_cleanup(struct obd_device *obd);
  65
  66 static inline int mdc_queue_wait(struct ptlrpc_request *req)
  67 {
  68         struct client_obd *cli = &req->rq_import->imp_obd->u.cli;
  69         int rc;
  70
  71         /* obd_get_request_slot() ensures that this client has no more
  72          * than cl_max_rpcs_in_flight RPCs simultaneously inf light
  73          * against an MDT. */
  74         rc = obd_get_request_slot(cli);
  75         if (rc != 0)
  76                 return rc;
  77
  78         rc = ptlrpc_queue_wait(req);
  79         obd_put_request_slot(cli);
  80
  81         return rc;
  82 }
  83
  84 /*
  85  * Send MDS_GET_ROOT RPC to fetch root FID.
  86  *
  87  * If \a fileset is not NULL it should contain a subdirectory off
  88  * the ROOT/ directory to be mounted on the client. Return the FID
  89  * of the subdirectory to the client to mount onto its mountpoint.
  90  *
  91  * \param[in]   imp     MDC import
  92  * \param[in]   fileset fileset name, which could be NULL
  93  * \param[out]  rootfid root FID of this mountpoint
  94  * \param[out]  pc      root capa will be unpacked and saved in this pointer
  95  *
  96  * \retval      0 on success, negative errno on failure
  97  */
  98 static int mdc_get_root(struct obd_export *exp, const char *fileset,
  99                          struct lu_fid *rootfid)
 100 {
 101         struct ptlrpc_request   *req;
 102         struct mdt_body         *body;
 103         int                      rc;
 104
 105         ENTRY;
 106
 107         if (fileset && !(exp_connect_flags(exp) & OBD_CONNECT_SUBTREE))
 108                 RETURN(-ENOTSUPP);
 109
 110         req = ptlrpc_request_alloc(class_exp2cliimp(exp),
 111                                 &RQF_MDS_GET_ROOT);
 112         if (req == NULL)
 113                 RETURN(-ENOMEM);
 114
 115         if (fileset != NULL)
 116                 req_capsule_set_size(&req->rq_pill, &RMF_NAME, RCL_CLIENT,
 117                                      strlen(fileset) + 1);
 118         rc = ptlrpc_request_pack(req, LUSTRE_MDS_VERSION, MDS_GET_ROOT);
 119         if (rc) {
 120                 ptlrpc_request_free(req);
 121                 RETURN(rc);
 122         }
 123         mdc_pack_body(req, NULL, 0, 0, -1, 0);
 124         if (fileset != NULL) {
 125                 char *name = req_capsule_client_get(&req->rq_pill, &RMF_NAME);
 126
 127                 memcpy(name, fileset, strlen(fileset));
 128         }
 129         lustre_msg_add_flags(req->rq_reqmsg, LUSTRE_IMP_FULL);
 130         req->rq_send_state = LUSTRE_IMP_FULL;
 131
 132         ptlrpc_request_set_replen(req);
 133
 134         rc = ptlrpc_queue_wait(req);
 135         if (rc)
 136                 GOTO(out, rc);
 137
 138         body = req_capsule_server_get(&req->rq_pill, &RMF_MDT_BODY);
 139         if (body == NULL)
 140                 GOTO(out, rc = -EPROTO);
 141
 142         *rootfid = body->mbo_fid1;
 143         CDEBUG(D_NET, "root fid="DFID", last_committed=%llu\n",
 144                PFID(rootfid), lustre_msg_get_last_committed(req->rq_repmsg));
 145         EXIT;
 146 out:
 147         ptlrpc_req_finished(req);
 148
 149         return rc;
 150 }
 151
 152 /*
 153  * This function now is known to always saying that it will receive 4 buffers
 154  * from server. Even for cases when acl_size and md_size is zero, RPC header
 155  * will contain 4 fields and RPC itself will contain zero size fields. This is
 156  * because mdt_getattr*() _always_ returns 4 fields, but if acl is not needed
 157  * and thus zero, it shrinks it, making zero size. The same story about
 158  * md_size. And this is course of problem when client waits for smaller number
 159  * of fields. This issue will be fixed later when client gets aware of RPC
 160  * layouts.  --umka
 161  */
 162 static int mdc_getattr_common(struct obd_export *exp,
 163                               struct ptlrpc_request *req)
 164 {
 165         struct req_capsule *pill = &req->rq_pill;
 166         struct mdt_body    *body;
 167         void               *eadata;
 168         int                 rc;
 169         ENTRY;
 170
 171         /* Request message already built. */
 172         rc = ptlrpc_queue_wait(req);
 173         if (rc != 0)
 174                 RETURN(rc);
 175
 176         /* sanity check for the reply */
 177         body = req_capsule_server_get(pill, &RMF_MDT_BODY);
 178         if (body == NULL)
 179                 RETURN(-EPROTO);
 180
 181         CDEBUG(D_NET, "mode: %o\n", body->mbo_mode);
 182
 183         mdc_update_max_ea_from_body(exp, body);
 184         if (body->mbo_eadatasize != 0) {
 185                 eadata = req_capsule_server_sized_get(pill, &RMF_MDT_MD,
 186                                                       body->mbo_eadatasize);
 187                 if (eadata == NULL)
 188                         RETURN(-EPROTO);
 189         }
 190
 191         RETURN(0);
 192 }
 193
 194 static void mdc_reset_acl_req(struct ptlrpc_request *req)
 195 {
 196         spin_lock(&req->rq_early_free_lock);
 197         sptlrpc_cli_free_repbuf(req);
 198         req->rq_repbuf = NULL;
 199         req->rq_repbuf_len = 0;
 200         req->rq_repdata = NULL;
 201         req->rq_reqdata_len = 0;
 202         spin_unlock(&req->rq_early_free_lock);
 203 }
 204
 205 static int mdc_getattr(struct obd_export *exp, struct md_op_data *op_data,
 206                        struct ptlrpc_request **request)
 207 {
 208         struct ptlrpc_request *req;
 209         struct obd_import *imp = class_exp2cliimp(exp);
 210         __u32 acl_bufsize = LUSTRE_POSIX_ACL_MAX_SIZE_OLD;
 211         int rc;
 212         ENTRY;
 213
 214         /* Single MDS without an LMV case */
 215         if (op_data->op_flags & MF_GET_MDT_IDX) {
 216                 op_data->op_mds = 0;
 217                 RETURN(0);
 218         }
 219
 220         *request = NULL;
 221         req = ptlrpc_request_alloc(imp, &RQF_MDS_GETATTR);
 222         if (req == NULL)
 223                 RETURN(-ENOMEM);
 224
 225         rc = ptlrpc_request_pack(req, LUSTRE_MDS_VERSION, MDS_GETATTR);
 226         if (rc) {
 227                 ptlrpc_request_free(req);
 228                 RETURN(rc);
 229         }
 230
 231 again:
 232         mdc_pack_body(req, &op_data->op_fid1, op_data->op_valid,
 233                       op_data->op_mode, -1, 0);
 234         req_capsule_set_size(&req->rq_pill, &RMF_ACL, RCL_SERVER, acl_bufsize);
 235         req_capsule_set_size(&req->rq_pill, &RMF_MDT_MD, RCL_SERVER,
 236                              op_data->op_mode);
 237         ptlrpc_request_set_replen(req);
 238
 239         rc = mdc_getattr_common(exp, req);
 240         if (rc) {
 241                 if (rc == -ERANGE) {
 242                         acl_bufsize = min_t(__u32,
 243                                             imp->imp_connect_data.ocd_max_easize,
 244                                             XATTR_SIZE_MAX);
 245                         mdc_reset_acl_req(req);
 246                         goto again;
 247                 }
 248
 249                 ptlrpc_req_finished(req);
 250         } else {
 251                 *request = req;
 252         }
 253
 254         RETURN(rc);
 255 }
 256
 257 static int mdc_getattr_name(struct obd_export *exp, struct md_op_data *op_data,
 258                             struct ptlrpc_request **request)
 259 {
 260         struct ptlrpc_request *req;
 261         struct obd_import *imp = class_exp2cliimp(exp);
 262         __u32 acl_bufsize = LUSTRE_POSIX_ACL_MAX_SIZE_OLD;
 263         int rc;
 264         ENTRY;
 265
 266         *request = NULL;
 267         req = ptlrpc_request_alloc(imp, &RQF_MDS_GETATTR_NAME);
 268         if (req == NULL)
 269                 RETURN(-ENOMEM);
 270
 271         req_capsule_set_size(&req->rq_pill, &RMF_NAME, RCL_CLIENT,
 272                              op_data->op_namelen + 1);
 273
 274         rc = ptlrpc_request_pack(req, LUSTRE_MDS_VERSION, MDS_GETATTR_NAME);
 275         if (rc) {
 276                 ptlrpc_request_free(req);
 277                 RETURN(rc);
 278         }
 279
 280         if (op_data->op_name) {
 281                 char *name = req_capsule_client_get(&req->rq_pill, &RMF_NAME);
 282                 LASSERT(strnlen(op_data->op_name, op_data->op_namelen) ==
 283                                 op_data->op_namelen);
 284                 memcpy(name, op_data->op_name, op_data->op_namelen);
 285         }
 286
 287 again:
 288         mdc_pack_body(req, &op_data->op_fid1, op_data->op_valid,
 289                       op_data->op_mode, op_data->op_suppgids[0], 0);
 290         req_capsule_set_size(&req->rq_pill, &RMF_MDT_MD, RCL_SERVER,
 291                              op_data->op_mode);
 292         req_capsule_set_size(&req->rq_pill, &RMF_ACL, RCL_SERVER, acl_bufsize);
 293         ptlrpc_request_set_replen(req);
 294
 295         rc = mdc_getattr_common(exp, req);
 296         if (rc) {
 297                 if (rc == -ERANGE) {
 298                         acl_bufsize = min_t(__u32,
 299                                             imp->imp_connect_data.ocd_max_easize,
 300                                             XATTR_SIZE_MAX);
 301                         mdc_reset_acl_req(req);
 302                         goto again;
 303                 }
 304
 305                 ptlrpc_req_finished(req);
 306         } else {
 307                 *request = req;
 308         }
 309
 310         RETURN(rc);
 311 }
 312
 313 static int mdc_xattr_common(struct obd_export *exp,const struct req_format *fmt,
 314                             const struct lu_fid *fid, int opcode, u64 valid,
 315                             const char *xattr_name, const char *input,
 316                             int input_size, int output_size, int flags,
 317                             __u32 suppgid, struct ptlrpc_request **request)
 318 {
 319         struct ptlrpc_request *req;
 320         int   xattr_namelen = 0;
 321         char *tmp;
 322         int   rc;
 323         ENTRY;
 324
 325         *request = NULL;
 326         req = ptlrpc_request_alloc(class_exp2cliimp(exp), fmt);
 327         if (req == NULL)
 328                 RETURN(-ENOMEM);
 329
 330         if (xattr_name) {
 331                 xattr_namelen = strlen(xattr_name) + 1;
 332                 req_capsule_set_size(&req->rq_pill, &RMF_NAME, RCL_CLIENT,
 333                                      xattr_namelen);
 334         }
 335         if (input_size)
 336                 LASSERT(input);
 337         req_capsule_set_size(&req->rq_pill, &RMF_EADATA, RCL_CLIENT,
 338                              input_size);
 339
 340         /* get SELinux policy info if any */
 341         rc = sptlrpc_get_sepol(req);
 342         if (rc < 0) {
 343                 ptlrpc_request_free(req);
 344                 RETURN(rc);
 345         }
 346         req_capsule_set_size(&req->rq_pill, &RMF_SELINUX_POL, RCL_CLIENT,
 347                              strlen(req->rq_sepol) ?
 348                              strlen(req->rq_sepol) + 1 : 0);
 349
 350         /* Flush local XATTR locks to get rid of a possible cancel RPC */
 351         if (opcode == MDS_REINT && fid_is_sane(fid) &&
 352             exp->exp_connect_data.ocd_ibits_known & MDS_INODELOCK_XATTR) {
 353                 LIST_HEAD(cancels);
 354                 int count;
 355
 356                 /* Without that packing would fail */
 357                 if (input_size == 0)
 358                         req_capsule_set_size(&req->rq_pill, &RMF_EADATA,
 359                                              RCL_CLIENT, 0);
 360
 361                 count = mdc_resource_get_unused(exp, fid,
 362                                                 &cancels, LCK_EX,
 363                                                 MDS_INODELOCK_XATTR);
 364
 365                 rc = mdc_prep_elc_req(exp, req, MDS_REINT, &cancels, count);
 366                 if (rc) {
 367                         ptlrpc_request_free(req);
 368                         RETURN(rc);
 369                 }
 370         } else {
 371                 rc = ptlrpc_request_pack(req, LUSTRE_MDS_VERSION, opcode);
 372                 if (rc) {
 373                         ptlrpc_request_free(req);
 374                         RETURN(rc);
 375                 }
 376         }
 377
 378         if (opcode == MDS_REINT) {
 379                 struct mdt_rec_setxattr *rec;
 380
 381                 BUILD_BUG_ON(sizeof(struct mdt_rec_setxattr) !=
 382                              sizeof(struct mdt_rec_reint));
 383                 rec = req_capsule_client_get(&req->rq_pill, &RMF_REC_REINT);
 384                 rec->sx_opcode = REINT_SETXATTR;
 385                 rec->sx_fsuid  = from_kuid(&init_user_ns, current_fsuid());
 386                 rec->sx_fsgid  = from_kgid(&init_user_ns, current_fsgid());
 387                 rec->sx_cap    = cfs_curproc_cap_pack();
 388                 rec->sx_suppgid1 = suppgid;
 389                 rec->sx_suppgid2 = -1;
 390                 rec->sx_fid    = *fid;
 391                 rec->sx_valid  = valid | OBD_MD_FLCTIME;
 392                 rec->sx_time   = ktime_get_real_seconds();
 393                 rec->sx_size   = output_size;
 394                 rec->sx_flags  = flags;
 395         } else {
 396                 mdc_pack_body(req, fid, valid, output_size, suppgid, flags);
 397         }
 398
 399         if (xattr_name) {
 400                 tmp = req_capsule_client_get(&req->rq_pill, &RMF_NAME);
 401                 memcpy(tmp, xattr_name, xattr_namelen);
 402         }
 403         if (input_size) {
 404                 tmp = req_capsule_client_get(&req->rq_pill, &RMF_EADATA);
 405                 memcpy(tmp, input, input_size);
 406         }
 407
 408         mdc_file_sepol_pack(req);
 409
 410         if (req_capsule_has_field(&req->rq_pill, &RMF_EADATA, RCL_SERVER))
 411                 req_capsule_set_size(&req->rq_pill, &RMF_EADATA,
 412                                      RCL_SERVER, output_size);
 413         ptlrpc_request_set_replen(req);
 414
 415         /* make rpc */
 416         if (opcode == MDS_REINT)
 417                 ptlrpc_get_mod_rpc_slot(req);
 418
 419         rc = ptlrpc_queue_wait(req);
 420
 421         if (opcode == MDS_REINT)
 422                 ptlrpc_put_mod_rpc_slot(req);
 423
 424         if (rc)
 425                 ptlrpc_req_finished(req);
 426         else
 427                 *request = req;
 428         RETURN(rc);
 429 }
 430
 431 static int mdc_setxattr(struct obd_export *exp, const struct lu_fid *fid,
 432                         u64 obd_md_valid, const char *name,
 433                         const void *value, size_t value_size,
 434                         unsigned int xattr_flags, u32 suppgid,
 435                         struct ptlrpc_request **req)
 436 {
 437         LASSERT(obd_md_valid == OBD_MD_FLXATTR ||
 438                 obd_md_valid == OBD_MD_FLXATTRRM);
 439
 440         return mdc_xattr_common(exp, &RQF_MDS_REINT_SETXATTR,
 441                                 fid, MDS_REINT, obd_md_valid, name,
 442                                 value, value_size, 0, xattr_flags, suppgid,
 443                                 req);
 444 }
 445
 446 static int mdc_getxattr(struct obd_export *exp, const struct lu_fid *fid,
 447                         u64 obd_md_valid, const char *name, size_t buf_size,
 448                         struct ptlrpc_request **req)
 449 {
 450         struct mdt_body *body;
 451         int rc;
 452
 453         LASSERT(obd_md_valid == OBD_MD_FLXATTR ||
 454                 obd_md_valid == OBD_MD_FLXATTRLS);
 455
 456         /* The below message is checked in sanity-selinux.sh test_20d */
 457         CDEBUG(D_INFO, "%s: get xattr '%s' for "DFID"\n",
 458                exp->exp_obd->obd_name, name, PFID(fid));
 459         rc = mdc_xattr_common(exp, &RQF_MDS_GETXATTR, fid, MDS_GETXATTR,
 460                               obd_md_valid, name, NULL, 0, buf_size, 0, -1,
 461                               req);
 462         if (rc < 0)
 463                 GOTO(out, rc);
 464
 465         body = req_capsule_server_get(&(*req)->rq_pill, &RMF_MDT_BODY);
 466         if (body == NULL)
 467                 GOTO(out, rc = -EPROTO);
 468
 469         /* only detect the xattr size */
 470         if (buf_size == 0) {
 471                 /* LU-11109: Older MDTs do not distinguish
 472                  * between nonexistent xattrs and zero length
 473                  * values in this case. Newer MDTs will return
 474                  * -ENODATA or set OBD_MD_FLXATTR. */
 475                 GOTO(out, rc = body->mbo_eadatasize);
 476         }
 477
 478         if (body->mbo_eadatasize == 0) {
 479                 /* LU-11109: Newer MDTs set OBD_MD_FLXATTR on
 480                  * success so that we can distinguish between
 481                  * zero length value and nonexistent xattr.
 482                  *
 483                  * If OBD_MD_FLXATTR is not set then we keep
 484                  * the old behavior and return -ENODATA for
 485                  * getxattr() when mbo_eadatasize is 0. But
 486                  * -ENODATA only makes sense for getxattr()
 487                  * and not for listxattr(). */
 488                 if (body->mbo_valid & OBD_MD_FLXATTR)
 489                         GOTO(out, rc = 0);
 490                 else if (obd_md_valid == OBD_MD_FLXATTR)
 491                         GOTO(out, rc = -ENODATA);
 492                 else
 493                         GOTO(out, rc = 0);
 494         }
 495
 496         GOTO(out, rc = body->mbo_eadatasize);
 497 out:
 498         if (rc < 0) {
 499                 ptlrpc_req_finished(*req);
 500                 *req = NULL;
 501         }
 502
 503         return rc;
 504 }
 505
 506 #ifdef CONFIG_LUSTRE_FS_POSIX_ACL
 507 static int mdc_unpack_acl(struct ptlrpc_request *req, struct lustre_md *md)
 508 {
 509         struct req_capsule     *pill = &req->rq_pill;
 510         struct mdt_body        *body = md->body;
 511         struct posix_acl       *acl;
 512         void                   *buf;
 513         int                     rc;
 514         ENTRY;
 515
 516         if (!body->mbo_aclsize)
 517                 RETURN(0);
 518
 519         buf = req_capsule_server_sized_get(pill, &RMF_ACL, body->mbo_aclsize);
 520
 521         if (!buf)
 522                 RETURN(-EPROTO);
 523
 524         acl = posix_acl_from_xattr(&init_user_ns, buf, body->mbo_aclsize);
 525         if (acl == NULL)
 526                 RETURN(0);
 527         if (IS_ERR(acl)) {
 528                 rc = PTR_ERR(acl);
 529                 CERROR("convert xattr to acl: %d\n", rc);
 530                 RETURN(rc);
 531         }
 532
 533         rc = posix_acl_valid(&init_user_ns, acl);
 534         if (rc) {
 535                 CERROR("validate acl: %d\n", rc);
 536                 posix_acl_release(acl);
 537                 RETURN(rc);
 538         }
 539
 540         md->posix_acl = acl;
 541         RETURN(0);
 542 }
 543 #else
 544 #define mdc_unpack_acl(req, md) 0
 545 #endif
 546 #ifdef HAVE_XA_IS_VALUE
 547 # include <linux/xarray.h>
 548 #endif
 549
 550 int mdc_get_lustre_md(struct obd_export *exp, struct ptlrpc_request *req,
 551                       struct obd_export *dt_exp, struct obd_export *md_exp,
 552                       struct lustre_md *md)
 553 {
 554         struct req_capsule *pill = &req->rq_pill;
 555         int rc;
 556         ENTRY;
 557
 558         LASSERT(md);
 559         memset(md, 0, sizeof(*md));
 560
 561         md->body = req_capsule_server_get(pill, &RMF_MDT_BODY);
 562         LASSERT(md->body != NULL);
 563
 564         if (md->body->mbo_valid & OBD_MD_FLEASIZE) {
 565                 if (!S_ISREG(md->body->mbo_mode)) {
 566                         CDEBUG(D_INFO, "OBD_MD_FLEASIZE set, should be a "
 567                                "regular file, but is not\n");
 568                         GOTO(out, rc = -EPROTO);
 569                 }
 570
 571                 if (md->body->mbo_eadatasize == 0) {
 572                         CDEBUG(D_INFO, "OBD_MD_FLEASIZE set, "
 573                                "but eadatasize 0\n");
 574                         GOTO(out, rc = -EPROTO);
 575                 }
 576
 577                 md->layout.lb_len = md->body->mbo_eadatasize;
 578                 md->layout.lb_buf = req_capsule_server_sized_get(pill,
 579                                                         &RMF_MDT_MD,
 580                                                         md->layout.lb_len);
 581                 if (md->layout.lb_buf == NULL)
 582                         GOTO(out, rc = -EPROTO);
 583         } else if (md->body->mbo_valid & OBD_MD_FLDIREA) {
 584                 const union lmv_mds_md *lmv;
 585                 size_t lmv_size;
 586
 587                 if (!S_ISDIR(md->body->mbo_mode)) {
 588                         CDEBUG(D_INFO, "OBD_MD_FLDIREA set, should be a "
 589                                "directory, but is not\n");
 590                         GOTO(out, rc = -EPROTO);
 591                 }
 592
 593                 if (md->body->mbo_valid & OBD_MD_MEA) {
 594                         lmv_size = md->body->mbo_eadatasize;
 595                         if (lmv_size == 0) {
 596                                 CDEBUG(D_INFO, "OBD_MD_FLDIREA is set, "
 597                                        "but eadatasize 0\n");
 598                                 RETURN(-EPROTO);
 599                         }
 600
 601                         lmv = req_capsule_server_sized_get(pill, &RMF_MDT_MD,
 602                                                            lmv_size);
 603                         if (lmv == NULL)
 604                                 GOTO(out, rc = -EPROTO);
 605
 606                         rc = md_unpackmd(md_exp, &md->lmv, lmv, lmv_size);
 607                         if (rc < 0)
 608                                 GOTO(out, rc);
 609
 610                         if (rc < (int)sizeof(*md->lmv)) {
 611                                 struct lmv_foreign_md *lfm = md->lfm;
 612
 613                                 /* short (< sizeof(struct lmv_stripe_md))
 614                                  * foreign LMV case
 615                                  */
 616                                 if (lfm->lfm_magic != LMV_MAGIC_FOREIGN) {
 617                                         CDEBUG(D_INFO,
 618                                                "lmv size too small: %d < %d\n",
 619                                                rc, (int)sizeof(*md->lmv));
 620                                         GOTO(out, rc = -EPROTO);
 621                                 }
 622                         }
 623                 }
 624
 625                 /* since 2.12.58 intent_getattr fetches default LMV */
 626                 if (md->body->mbo_valid & OBD_MD_DEFAULT_MEA) {
 627                         lmv_size = sizeof(struct lmv_user_md);
 628                         lmv = req_capsule_server_sized_get(pill,
 629                                                            &RMF_DEFAULT_MDT_MD,
 630                                                            lmv_size);
 631                         if (!lmv)
 632                                 GOTO(out, rc = -EPROTO);
 633
 634                         rc = md_unpackmd(md_exp, &md->default_lmv, lmv,
 635                                          lmv_size);
 636                         if (rc < 0)
 637                                 GOTO(out, rc);
 638
 639                         if (rc < (int)sizeof(*md->default_lmv)) {
 640                                 CDEBUG(D_INFO,
 641                                        "default lmv size too small: %d < %d\n",
 642                                         rc, (int)sizeof(*md->default_lmv));
 643                                 GOTO(out, rc = -EPROTO);
 644                         }
 645                 }
 646         }
 647         rc = 0;
 648
 649         if (md->body->mbo_valid & OBD_MD_FLACL) {
 650                 /* for ACL, it's possible that FLACL is set but aclsize is zero.
 651                  * only when aclsize != 0 there's an actual segment for ACL
 652                  * in reply buffer.
 653                  */
 654                 if (md->body->mbo_aclsize) {
 655                         rc = mdc_unpack_acl(req, md);
 656                         if (rc)
 657                                 GOTO(out, rc);
 658 #ifdef CONFIG_LUSTRE_FS_POSIX_ACL
 659                 } else {
 660                         md->posix_acl = NULL;
 661 #endif
 662                 }
 663         }
 664
 665         EXIT;
 666 out:
 667         if (rc) {
 668 #ifdef CONFIG_LUSTRE_FS_POSIX_ACL
 669                 posix_acl_release(md->posix_acl);
 670 #endif
 671         }
 672         return rc;
 673 }
 674
 675 int mdc_free_lustre_md(struct obd_export *exp, struct lustre_md *md)
 676 {
 677         ENTRY;
 678         RETURN(0);
 679 }
 680
 681 void mdc_replay_open(struct ptlrpc_request *req)
 682 {
 683         struct md_open_data *mod = req->rq_cb_data;
 684         struct ptlrpc_request *close_req;
 685         struct obd_client_handle *och;
 686         struct lustre_handle old_open_handle = { };
 687         struct mdt_body *body;
 688         ENTRY;
 689
 690         if (mod == NULL) {
 691                 DEBUG_REQ(D_ERROR, req,
 692                           "cannot properly replay without open data");
 693                 EXIT;
 694                 return;
 695         }
 696
 697         body = req_capsule_server_get(&req->rq_pill, &RMF_MDT_BODY);
 698         LASSERT(body != NULL);
 699
 700         spin_lock(&req->rq_lock);
 701         och = mod->mod_och;
 702         if (och && och->och_open_handle.cookie)
 703                 req->rq_early_free_repbuf = 1;
 704         else
 705                 req->rq_early_free_repbuf = 0;
 706         spin_unlock(&req->rq_lock);
 707
 708         if (req->rq_early_free_repbuf) {
 709                 struct lustre_handle *file_open_handle;
 710
 711                 LASSERT(och->och_magic == OBD_CLIENT_HANDLE_MAGIC);
 712
 713                 file_open_handle = &och->och_open_handle;
 714                 CDEBUG(D_HA, "updating handle from %#llx to %#llx\n",
 715                        file_open_handle->cookie, body->mbo_open_handle.cookie);
 716                 old_open_handle = *file_open_handle;
 717                 *file_open_handle = body->mbo_open_handle;
 718         }
 719
 720         close_req = mod->mod_close_req;
 721         if (close_req) {
 722                 __u32 opc = lustre_msg_get_opc(close_req->rq_reqmsg);
 723                 struct mdt_ioepoch *epoch;
 724
 725                 LASSERT(opc == MDS_CLOSE);
 726                 epoch = req_capsule_client_get(&close_req->rq_pill,
 727                                                &RMF_MDT_EPOCH);
 728                 LASSERT(epoch);
 729
 730                 if (req->rq_early_free_repbuf)
 731                         LASSERT(old_open_handle.cookie ==
 732                                 epoch->mio_open_handle.cookie);
 733
 734                 DEBUG_REQ(D_HA, close_req, "updating close body with new fh");
 735                 epoch->mio_open_handle = body->mbo_open_handle;
 736         }
 737         EXIT;
 738 }
 739
 740 void mdc_commit_open(struct ptlrpc_request *req)
 741 {
 742         struct md_open_data *mod = req->rq_cb_data;
 743         if (mod == NULL)
 744                 return;
 745
 746         /**
 747          * No need to touch md_open_data::mod_och, it holds a reference on
 748          * \var mod and will zero references to each other, \var mod will be
 749          * freed after that when md_open_data::mod_och will put the reference.
 750          */
 751
 752         /**
 753          * Do not let open request to disappear as it still may be needed
 754          * for close rpc to happen (it may happen on evict only, otherwise
 755          * ptlrpc_request::rq_replay does not let mdc_commit_open() to be
 756          * called), just mark this rpc as committed to distinguish these 2
 757          * cases, see mdc_close() for details. The open request reference will
 758          * be put along with freeing \var mod.
 759          */
 760         ptlrpc_request_addref(req);
 761         spin_lock(&req->rq_lock);
 762         req->rq_committed = 1;
 763         spin_unlock(&req->rq_lock);
 764         req->rq_cb_data = NULL;
 765         obd_mod_put(mod);
 766 }
 767
 768 int mdc_set_open_replay_data(struct obd_export *exp,
 769                              struct obd_client_handle *och,
 770                              struct lookup_intent *it)
 771 {
 772         struct md_open_data     *mod;
 773         struct mdt_rec_create   *rec;
 774         struct mdt_body         *body;
 775         struct ptlrpc_request   *open_req = it->it_request;
 776         struct obd_import       *imp = open_req->rq_import;
 777         ENTRY;
 778
 779         if (!open_req->rq_replay)
 780                 RETURN(0);
 781
 782         rec = req_capsule_client_get(&open_req->rq_pill, &RMF_REC_REINT);
 783         body = req_capsule_server_get(&open_req->rq_pill, &RMF_MDT_BODY);
 784         LASSERT(rec != NULL);
 785         /* Incoming message in my byte order (it's been swabbed). */
 786         /* Outgoing messages always in my byte order. */
 787         LASSERT(body != NULL);
 788
 789         /* Only if the import is replayable, we set replay_open data */
 790         if (och && imp->imp_replayable) {
 791                 mod = obd_mod_alloc();
 792                 if (mod == NULL) {
 793                         DEBUG_REQ(D_ERROR, open_req,
 794                                   "cannot allocate md_open_data");
 795                         RETURN(0);
 796                 }
 797
 798                 /**
 799                  * Take a reference on \var mod, to be freed on mdc_close().
 800                  * It protects \var mod from being freed on eviction (commit
 801                  * callback is called despite rq_replay flag).
 802                  * Another reference for \var och.
 803                  */
 804                 obd_mod_get(mod);
 805                 obd_mod_get(mod);
 806
 807                 spin_lock(&open_req->rq_lock);
 808                 och->och_mod = mod;
 809                 mod->mod_och = och;
 810                 mod->mod_is_create = it_disposition(it, DISP_OPEN_CREATE) ||
 811                                      it_disposition(it, DISP_OPEN_STRIPE);
 812                 mod->mod_open_req = open_req;
 813                 open_req->rq_cb_data = mod;
 814                 open_req->rq_commit_cb = mdc_commit_open;
 815                 open_req->rq_early_free_repbuf = 1;
 816                 spin_unlock(&open_req->rq_lock);
 817         }
 818
 819         rec->cr_fid2 = body->mbo_fid1;
 820         rec->cr_open_handle_old = body->mbo_open_handle;
 821         open_req->rq_replay_cb = mdc_replay_open;
 822         if (!fid_is_sane(&body->mbo_fid1)) {
 823                 DEBUG_REQ(D_ERROR, open_req,
 824                           "saving replay request with insane FID " DFID,
 825                           PFID(&body->mbo_fid1));
 826                 LBUG();
 827         }
 828
 829         DEBUG_REQ(D_RPCTRACE, open_req, "Set up open replay data");
 830         RETURN(0);
 831 }
 832
 833 static void mdc_free_open(struct md_open_data *mod)
 834 {
 835         int committed = 0;
 836
 837         if (mod->mod_is_create == 0 &&
 838             imp_connect_disp_stripe(mod->mod_open_req->rq_import))
 839                 committed = 1;
 840
 841         /**
 842          * No reason to asssert here if the open request has
 843          * rq_replay == 1. It means that mdc_close failed, and
 844          * close request wasn`t sent. It is not fatal to client.
 845          * The worst thing is eviction if the client gets open lock
 846          **/
 847
 848         DEBUG_REQ(D_RPCTRACE, mod->mod_open_req,
 849                   "free open request, rq_replay=%d",
 850                   mod->mod_open_req->rq_replay);
 851
 852         ptlrpc_request_committed(mod->mod_open_req, committed);
 853         if (mod->mod_close_req)
 854                 ptlrpc_request_committed(mod->mod_close_req, committed);
 855 }
 856
 857 int mdc_clear_open_replay_data(struct obd_export *exp,
 858                                struct obd_client_handle *och)
 859 {
 860         struct md_open_data *mod = och->och_mod;
 861         ENTRY;
 862
 863         /**
 864          * It is possible to not have \var mod in a case of eviction between
 865          * lookup and ll_file_open().
 866          **/
 867         if (mod == NULL)
 868                 RETURN(0);
 869
 870         LASSERT(mod != LP_POISON);
 871         LASSERT(mod->mod_open_req != NULL);
 872
 873         spin_lock(&mod->mod_open_req->rq_lock);
 874         if (mod->mod_och)
 875                 mod->mod_och->och_open_handle.cookie = 0;
 876         mod->mod_open_req->rq_early_free_repbuf = 0;
 877         spin_unlock(&mod->mod_open_req->rq_lock);
 878         mdc_free_open(mod);
 879
 880         mod->mod_och = NULL;
 881         och->och_mod = NULL;
 882         obd_mod_put(mod);
 883
 884         RETURN(0);
 885 }
 886
 887 static int mdc_close(struct obd_export *exp, struct md_op_data *op_data,
 888                      struct md_open_data *mod, struct ptlrpc_request **request)
 889 {
 890         struct obd_device     *obd = class_exp2obd(exp);
 891         struct ptlrpc_request *req;
 892         struct req_format     *req_fmt;
 893         size_t                 u32_count = 0;
 894         int                    rc;
 895         int                    saved_rc = 0;
 896         ENTRY;
 897
 898         CDEBUG(D_INODE, "%s: "DFID" file closed with intent: %x\n",
 899                exp->exp_obd->obd_name, PFID(&op_data->op_fid1),
 900                op_data->op_bias);
 901
 902         if (op_data->op_bias & MDS_CLOSE_INTENT) {
 903                 req_fmt = &RQF_MDS_CLOSE_INTENT;
 904                 if (op_data->op_bias & MDS_HSM_RELEASE) {
 905                         /* allocate a FID for volatile file */
 906                         rc = mdc_fid_alloc(NULL, exp, &op_data->op_fid2,
 907                                            op_data);
 908                         if (rc < 0) {
 909                                 CERROR("%s: "DFID" allocating FID: rc = %d\n",
 910                                        obd->obd_name, PFID(&op_data->op_fid1),
 911                                        rc);
 912                                 /* save the errcode and proceed to close */
 913                                 saved_rc = rc;
 914                         }
 915                 }
 916                 if (op_data->op_bias & MDS_CLOSE_RESYNC_DONE) {
 917                         size_t count = op_data->op_data_size / sizeof(__u32);
 918
 919                         if (count > INLINE_RESYNC_ARRAY_SIZE)
 920                                 u32_count = count;
 921                 }
 922         } else {
 923                 req_fmt = &RQF_MDS_CLOSE;
 924         }
 925
 926         *request = NULL;
 927         if (OBD_FAIL_CHECK(OBD_FAIL_MDC_CLOSE))
 928                 req = NULL;
 929         else
 930                 req = ptlrpc_request_alloc(class_exp2cliimp(exp), req_fmt);
 931
 932         /* Ensure that this close's handle is fixed up during replay. */
 933         if (likely(mod != NULL)) {
 934                 LASSERTF(mod->mod_open_req != NULL &&
 935                          mod->mod_open_req->rq_type != LI_POISON,
 936                          "POISONED open %p!\n", mod->mod_open_req);
 937
 938                 mod->mod_close_req = req;
 939
 940                 DEBUG_REQ(D_RPCTRACE, mod->mod_open_req, "matched open");
 941                 /* We no longer want to preserve this open for replay even
 942                  * though the open was committed. b=3632, b=3633 */
 943                 spin_lock(&mod->mod_open_req->rq_lock);
 944                 mod->mod_open_req->rq_replay = 0;
 945                 spin_unlock(&mod->mod_open_req->rq_lock);
 946         } else {
 947                 CDEBUG(D_HA, "couldn't find open req; expecting close error\n");
 948         }
 949         if (req == NULL) {
 950                 /**
 951                  * TODO: repeat close after errors
 952                  */
 953                 CWARN("%s: close of FID "DFID" failed, file reference will be "
 954                       "dropped when this client unmounts or is evicted\n",
 955                       obd->obd_name, PFID(&op_data->op_fid1));
 956                 GOTO(out, rc = -ENOMEM);
 957         }
 958
 959         if (u32_count > 0)
 960                 req_capsule_set_size(&req->rq_pill, &RMF_U32, RCL_CLIENT,
 961                                      u32_count * sizeof(__u32));
 962
 963         rc = ptlrpc_request_pack(req, LUSTRE_MDS_VERSION, MDS_CLOSE);
 964         if (rc) {
 965                 ptlrpc_request_free(req);
 966                 req = NULL;
 967                 GOTO(out, rc);
 968         }
 969
 970         /* To avoid a livelock (bug 7034), we need to send CLOSE RPCs to a
 971          * portal whose threads are not taking any DLM locks and are therefore
 972          * always progressing */
 973         req->rq_request_portal = MDS_READPAGE_PORTAL;
 974         ptlrpc_at_set_req_timeout(req);
 975
 976         if (!(exp_connect_flags2(exp) & OBD_CONNECT2_LSOM))
 977                 op_data->op_xvalid &= ~(OP_XVALID_LAZYSIZE |
 978                                         OP_XVALID_LAZYBLOCKS);
 979
 980         mdc_close_pack(req, op_data);
 981
 982         req_capsule_set_size(&req->rq_pill, &RMF_MDT_MD, RCL_SERVER,
 983                              obd->u.cli.cl_default_mds_easize);
 984
 985         ptlrpc_request_set_replen(req);
 986
 987         ptlrpc_get_mod_rpc_slot(req);
 988         rc = ptlrpc_queue_wait(req);
 989         ptlrpc_put_mod_rpc_slot(req);
 990
 991         if (req->rq_repmsg == NULL) {
 992                 CDEBUG(D_RPCTRACE, "request %p failed to send: rc = %d\n", req,
 993                        req->rq_status);
 994                 if (rc == 0)
 995                         rc = req->rq_status ?: -EIO;
 996         } else if (rc == 0 || rc == -EAGAIN) {
 997                 struct mdt_body *body;
 998
 999                 rc = lustre_msg_get_status(req->rq_repmsg);
1000                 if (lustre_msg_get_type(req->rq_repmsg) == PTL_RPC_MSG_ERR) {
1001                         DEBUG_REQ(D_ERROR, req,
1002                                   "type = PTL_RPC_MSG_ERR: rc = %d", rc);
1003                         if (rc > 0)
1004                                 rc = -rc;
1005                 }
1006                 body = req_capsule_server_get(&req->rq_pill, &RMF_MDT_BODY);
1007                 if (body == NULL)
1008                         rc = -EPROTO;
1009         } else if (rc == -ESTALE) {
1010                 /**
1011                  * it can be allowed error after 3633 if open was committed and
1012                  * server failed before close was sent. Let's check if mod
1013                  * exists and return no error in that case
1014                  */
1015                 if (mod) {
1016                         DEBUG_REQ(D_HA, req, "Reset ESTALE = %d", rc);
1017                         LASSERT(mod->mod_open_req != NULL);
1018                         if (mod->mod_open_req->rq_committed)
1019                                 rc = 0;
1020                 }
1021         }
1022
1023 out:
1024         if (mod) {
1025                 if (rc != 0)
1026                         mod->mod_close_req = NULL;
1027                 /* Since now, mod is accessed through open_req only,
1028                  * thus close req does not keep a reference on mod anymore. */
1029                 obd_mod_put(mod);
1030         }
1031         *request = req;
1032
1033         RETURN(rc < 0 ? rc : saved_rc);
1034 }
1035
1036 static int mdc_getpage(struct obd_export *exp, const struct lu_fid *fid,
1037                        u64 offset, struct page **pages, int npages,
1038                        struct ptlrpc_request **request)
1039 {
1040         struct ptlrpc_request   *req;
1041         struct ptlrpc_bulk_desc *desc;
1042         int                      i;
1043         int                      resends = 0;
1044         int                      rc;
1045         ENTRY;
1046
1047         *request = NULL;
1048
1049 restart_bulk:
1050         req = ptlrpc_request_alloc(class_exp2cliimp(exp), &RQF_MDS_READPAGE);
1051         if (req == NULL)
1052                 RETURN(-ENOMEM);
1053
1054         rc = ptlrpc_request_pack(req, LUSTRE_MDS_VERSION, MDS_READPAGE);
1055         if (rc) {
1056                 ptlrpc_request_free(req);
1057                 RETURN(rc);
1058         }
1059
1060         req->rq_request_portal = MDS_READPAGE_PORTAL;
1061         ptlrpc_at_set_req_timeout(req);
1062
1063         desc = ptlrpc_prep_bulk_imp(req, npages, 1,
1064                                     PTLRPC_BULK_PUT_SINK,
1065                                     MDS_BULK_PORTAL,
1066                                     &ptlrpc_bulk_kiov_pin_ops);
1067         if (desc == NULL) {
1068                 ptlrpc_req_finished(req);
1069                 RETURN(-ENOMEM);
1070         }
1071
1072         /* NB req now owns desc and will free it when it gets freed */
1073         for (i = 0; i < npages; i++)
1074                 desc->bd_frag_ops->add_kiov_frag(desc, pages[i], 0,
1075                                                  PAGE_SIZE);
1076
1077         mdc_readdir_pack(req, offset, PAGE_SIZE * npages, fid);
1078
1079         ptlrpc_request_set_replen(req);
1080         rc = ptlrpc_queue_wait(req);
1081         if (rc) {
1082                 ptlrpc_req_finished(req);
1083                 if (rc != -ETIMEDOUT)
1084                         RETURN(rc);
1085
1086                 resends++;
1087                 if (!client_should_resend(resends, &exp->exp_obd->u.cli)) {
1088                         CERROR("%s: too many resend retries: rc = %d\n",
1089                                exp->exp_obd->obd_name, -EIO);
1090                         RETURN(-EIO);
1091                 }
1092
1093                 /* If a signal interrupts then the timeout returned will
1094                  * not be zero. In that case return -EINTR
1095                  */
1096                 if (msleep_interruptible(resends * 1000))
1097                         RETURN(-EINTR);
1098
1099                 goto restart_bulk;
1100         }
1101
1102         rc = sptlrpc_cli_unwrap_bulk_read(req, req->rq_bulk,
1103                                           req->rq_bulk->bd_nob_transferred);
1104         if (rc < 0) {
1105                 ptlrpc_req_finished(req);
1106                 RETURN(rc);
1107         }
1108
1109         if (req->rq_bulk->bd_nob_transferred & ~LU_PAGE_MASK) {
1110                 CERROR("%s: unexpected bytes transferred: %d (%ld expected)\n",
1111                        exp->exp_obd->obd_name, req->rq_bulk->bd_nob_transferred,
1112                        PAGE_SIZE * npages);
1113                 ptlrpc_req_finished(req);
1114                 RETURN(-EPROTO);
1115         }
1116
1117         *request = req;
1118         RETURN(0);
1119 }
1120
1121 static void mdc_release_page(struct page *page, int remove)
1122 {
1123         if (remove) {
1124                 lock_page(page);
1125                 if (likely(page->mapping != NULL))
1126                         delete_from_page_cache(page);
1127                 unlock_page(page);
1128         }
1129         put_page(page);
1130 }
1131
1132 static struct page *mdc_page_locate(struct address_space *mapping, __u64 *hash,
1133                                     __u64 *start, __u64 *end, int hash64)
1134 {
1135         /*
1136          * Complement of hash is used as an index so that
1137          * radix_tree_gang_lookup() can be used to find a page with starting
1138          * hash _smaller_ than one we are looking for.
1139          */
1140         unsigned long offset = hash_x_index(*hash, hash64);
1141         struct page *page;
1142         unsigned long flags;
1143         int found;
1144
1145         xa_lock_irqsave(&mapping->i_pages, flags);
1146         found = radix_tree_gang_lookup(&mapping->page_tree,
1147                                        (void **)&page, offset, 1);
1148         if (found > 0 && !xa_is_value(page)) {
1149                 struct lu_dirpage *dp;
1150
1151                 get_page(page);
1152                 xa_unlock_irqrestore(&mapping->i_pages, flags);
1153                 /*
1154                  * In contrast to find_lock_page() we are sure that directory
1155                  * page cannot be truncated (while DLM lock is held) and,
1156                  * hence, can avoid restart.
1157                  *
1158                  * In fact, page cannot be locked here at all, because
1159                  * mdc_read_page_remote does synchronous io.
1160                  */
1161                 wait_on_page_locked(page);
1162                 if (PageUptodate(page)) {
1163                         dp = kmap(page);
1164                         if (BITS_PER_LONG == 32 && hash64) {
1165                                 *start = le64_to_cpu(dp->ldp_hash_start) >> 32;
1166                                 *end   = le64_to_cpu(dp->ldp_hash_end) >> 32;
1167                                 *hash  = *hash >> 32;
1168                         } else {
1169                                 *start = le64_to_cpu(dp->ldp_hash_start);
1170                                 *end   = le64_to_cpu(dp->ldp_hash_end);
1171                         }
1172                         if (unlikely(*start == 1 && *hash == 0))
1173                                 *hash = *start;
1174                         else
1175                                 LASSERTF(*start <= *hash, "start = %#llx"
1176                                          ",end = %#llx,hash = %#llx\n",
1177                                          *start, *end, *hash);
1178                         CDEBUG(D_VFSTRACE, "offset %lx [%#llx %#llx],"
1179                               " hash %#llx\n", offset, *start, *end, *hash);
1180                         if (*hash > *end) {
1181                                 kunmap(page);
1182                                 mdc_release_page(page, 0);
1183                                 page = NULL;
1184                         } else if (*end != *start && *hash == *end) {
1185                                 /*
1186                                  * upon hash collision, remove this page,
1187                                  * otherwise put page reference, and
1188                                  * mdc_read_page_remote() will issue RPC to
1189                                  * fetch the page we want.
1190                                  */
1191                                 kunmap(page);
1192                                 mdc_release_page(page,
1193                                     le32_to_cpu(dp->ldp_flags) & LDF_COLLIDE);
1194                                 page = NULL;
1195                         }
1196                 } else {
1197                         put_page(page);
1198                         page = ERR_PTR(-EIO);
1199                 }
1200         } else {
1201                 xa_unlock_irqrestore(&mapping->i_pages, flags);
1202                 page = NULL;
1203         }
1204         return page;
1205 }
1206
1207 /*
1208  * Adjust a set of pages, each page containing an array of lu_dirpages,
1209  * so that each page can be used as a single logical lu_dirpage.
1210  *
1211  * A lu_dirpage is laid out as follows, where s = ldp_hash_start,
1212  * e = ldp_hash_end, f = ldp_flags, p = padding, and each "ent" is a
1213  * struct lu_dirent.  It has size up to LU_PAGE_SIZE. The ldp_hash_end
1214  * value is used as a cookie to request the next lu_dirpage in a
1215  * directory listing that spans multiple pages (two in this example):
1216  *   ________
1217  *  |        |
1218  * .|--------v-------   -----.
1219  * |s|e|f|p|ent|ent| ... |ent|
1220  * '--|--------------   -----'   Each PAGE contains a single
1221  *    '------.                   lu_dirpage.
1222  * .---------v-------   -----.
1223  * |s|e|f|p|ent| 0 | ... | 0 |
1224  * '-----------------   -----'
1225  *
1226  * However, on hosts where the native VM page size (PAGE_SIZE) is
1227  * larger than LU_PAGE_SIZE, a single host page may contain multiple
1228  * lu_dirpages. After reading the lu_dirpages from the MDS, the
1229  * ldp_hash_end of the first lu_dirpage refers to the one immediately
1230  * after it in the same PAGE (arrows simplified for brevity, but
1231  * in general e0==s1, e1==s2, etc.):
1232  *
1233  * .--------------------   -----.
1234  * |s0|e0|f0|p|ent|ent| ... |ent|
1235  * |---v----------------   -----|
1236  * |s1|e1|f1|p|ent|ent| ... |ent|
1237  * |---v----------------   -----|  Here, each PAGE contains
1238  *             ...                 multiple lu_dirpages.
1239  * |---v----------------   -----|
1240  * |s'|e'|f'|p|ent|ent| ... |ent|
1241  * '---|----------------   -----'
1242  *     v
1243  * .----------------------------.
1244  * |        next PAGE           |
1245  *
1246  * This structure is transformed into a single logical lu_dirpage as follows:
1247  *
1248  * - Replace e0 with e' so the request for the next lu_dirpage gets the page
1249  *   labeled 'next PAGE'.
1250  *
1251  * - Copy the LDF_COLLIDE flag from f' to f0 to correctly reflect whether
1252  *   a hash collision with the next page exists.
1253  *
1254  * - Adjust the lde_reclen of the ending entry of each lu_dirpage to span
1255  *   to the first entry of the next lu_dirpage.
1256  */
1257 #if PAGE_SIZE > LU_PAGE_SIZE
1258 static void mdc_adjust_dirpages(struct page **pages, int cfs_pgs, int lu_pgs)
1259 {
1260         int i;
1261
1262         for (i = 0; i < cfs_pgs; i++) {
1263                 struct lu_dirpage *dp = kmap(pages[i]);
1264                 struct lu_dirpage *first = dp;
1265                 struct lu_dirent *end_dirent = NULL;
1266                 struct lu_dirent *ent;
1267                 __u64 hash_end = dp->ldp_hash_end;
1268                 __u32 flags = dp->ldp_flags;
1269
1270                 while (--lu_pgs > 0) {
1271                         ent = lu_dirent_start(dp);
1272                         for (end_dirent = ent; ent != NULL;
1273                              end_dirent = ent, ent = lu_dirent_next(ent));
1274
1275                         /* Advance dp to next lu_dirpage. */
1276                         dp = (struct lu_dirpage *)((char *)dp + LU_PAGE_SIZE);
1277
1278                         /* Check if we've reached the end of the PAGE. */
1279                         if (!((unsigned long)dp & ~PAGE_MASK))
1280                                 break;
1281
1282                         /* Save the hash and flags of this lu_dirpage. */
1283                         hash_end = dp->ldp_hash_end;
1284                         flags = dp->ldp_flags;
1285
1286                         /* Check if lu_dirpage contains no entries. */
1287                         if (end_dirent == NULL)
1288                                 break;
1289
1290                         /* Enlarge the end entry lde_reclen from 0 to
1291                          * first entry of next lu_dirpage. */
1292                         LASSERT(le16_to_cpu(end_dirent->lde_reclen) == 0);
1293                         end_dirent->lde_reclen =
1294                                 cpu_to_le16((char *)(dp->ldp_entries) -
1295                                             (char *)end_dirent);
1296                 }
1297
1298                 first->ldp_hash_end = hash_end;
1299                 first->ldp_flags &= ~cpu_to_le32(LDF_COLLIDE);
1300                 first->ldp_flags |= flags & cpu_to_le32(LDF_COLLIDE);
1301
1302                 kunmap(pages[i]);
1303         }
1304         LASSERTF(lu_pgs == 0, "left = %d\n", lu_pgs);
1305 }
1306 #else
1307 #define mdc_adjust_dirpages(pages, cfs_pgs, lu_pgs) do {} while (0)
1308 #endif  /* PAGE_SIZE > LU_PAGE_SIZE */
1309
1310 /* parameters for readdir page */
1311 struct readpage_param {
1312         struct md_op_data       *rp_mod;
1313         __u64                   rp_off;
1314         int                     rp_hash64;
1315         struct obd_export       *rp_exp;
1316         struct md_callback      *rp_cb;
1317 };
1318
1319 /**
1320  * Read pages from server.
1321  *
1322  * Page in MDS_READPAGE RPC is packed in LU_PAGE_SIZE, and each page contains
1323  * a header lu_dirpage which describes the start/end hash, and whether this
1324  * page is empty (contains no dir entry) or hash collide with next page.
1325  * After client receives reply, several pages will be integrated into dir page
1326  * in PAGE_SIZE (if PAGE_SIZE greater than LU_PAGE_SIZE), and the
1327  * lu_dirpage for this integrated page will be adjusted.
1328  **/
1329 static int mdc_read_page_remote(void *data, struct page *page0)
1330 {
1331         struct readpage_param *rp = data;
1332         struct page **page_pool;
1333         struct page *page;
1334         struct lu_dirpage *dp;
1335         struct md_op_data *op_data = rp->rp_mod;
1336         struct ptlrpc_request *req;
1337         int max_pages;
1338         struct inode *inode;
1339         struct lu_fid *fid;
1340         int rd_pgs = 0; /* number of pages actually read */
1341         int npages;
1342         int i;
1343         int rc;
1344         ENTRY;
1345
1346         max_pages = rp->rp_exp->exp_obd->u.cli.cl_max_pages_per_rpc;
1347         inode = op_data->op_data;
1348         fid = &op_data->op_fid1;
1349         LASSERT(inode != NULL);
1350
1351         OBD_ALLOC(page_pool, sizeof(page_pool[0]) * max_pages);
1352         if (page_pool != NULL) {
1353                 page_pool[0] = page0;
1354         } else {
1355                 page_pool = &page0;
1356                 max_pages = 1;
1357         }
1358
1359         for (npages = 1; npages < max_pages; npages++) {
1360                 page = page_cache_alloc(inode->i_mapping);
1361                 if (page == NULL)
1362                         break;
1363                 page_pool[npages] = page;
1364         }
1365
1366         rc = mdc_getpage(rp->rp_exp, fid, rp->rp_off, page_pool, npages, &req);
1367         if (rc < 0) {
1368                 /* page0 is special, which was added into page cache early */
1369                 delete_from_page_cache(page0);
1370         } else {
1371                 int lu_pgs;
1372
1373                 rd_pgs = (req->rq_bulk->bd_nob_transferred + PAGE_SIZE - 1) >>
1374                         PAGE_SHIFT;
1375                 lu_pgs = req->rq_bulk->bd_nob_transferred >> LU_PAGE_SHIFT;
1376                 LASSERT(!(req->rq_bulk->bd_nob_transferred & ~LU_PAGE_MASK));
1377
1378                 CDEBUG(D_INODE, "read %d(%d) pages\n", rd_pgs, lu_pgs);
1379
1380                 mdc_adjust_dirpages(page_pool, rd_pgs, lu_pgs);
1381
1382                 SetPageUptodate(page0);
1383         }
1384         unlock_page(page0);
1385
1386         ptlrpc_req_finished(req);
1387         CDEBUG(D_CACHE, "read %d/%d pages\n", rd_pgs, npages);
1388         for (i = 1; i < npages; i++) {
1389                 unsigned long   offset;
1390                 __u64           hash;
1391                 int ret;
1392
1393                 page = page_pool[i];
1394
1395                 if (rc < 0 || i >= rd_pgs) {
1396                         put_page(page);
1397                         continue;
1398                 }
1399
1400                 SetPageUptodate(page);
1401
1402                 dp = kmap(page);
1403                 hash = le64_to_cpu(dp->ldp_hash_start);
1404                 kunmap(page);
1405
1406                 offset = hash_x_index(hash, rp->rp_hash64);
1407
1408                 prefetchw(&page->flags);
1409                 ret = add_to_page_cache_lru(page, inode->i_mapping, offset,
1410                                             GFP_KERNEL);
1411                 if (ret == 0)
1412                         unlock_page(page);
1413                 else
1414                         CDEBUG(D_VFSTRACE, "page %lu add to page cache failed:"
1415                                " rc = %d\n", offset, ret);
1416                 put_page(page);
1417         }
1418
1419         if (page_pool != &page0)
1420                 OBD_FREE(page_pool, sizeof(page_pool[0]) * max_pages);
1421
1422         RETURN(rc);
1423 }
1424
1425 /**
1426  * Read dir page from cache first, if it can not find it, read it from
1427  * server and add into the cache.
1428  *
1429  * \param[in] exp       MDC export
1430  * \param[in] op_data   client MD stack parameters, transfering parameters
1431  *                      between different layers on client MD stack.
1432  * \param[in] cb_op     callback required for ldlm lock enqueue during
1433  *                      read page
1434  * \param[in] hash_offset the hash offset of the page to be read
1435  * \param[in] ppage     the page to be read
1436  *
1437  * retval               = 0 get the page successfully
1438  *                      errno(<0) get the page failed
1439  */
1440 static int mdc_read_page(struct obd_export *exp, struct md_op_data *op_data,
1441                          struct md_callback *cb_op, __u64 hash_offset,
1442                          struct page **ppage)
1443 {
1444         struct lookup_intent    it = { .it_op = IT_READDIR };
1445         struct page             *page;
1446         struct inode            *dir = op_data->op_data;
1447         struct address_space    *mapping;
1448         struct lu_dirpage       *dp;
1449         __u64                   start = 0;
1450         __u64                   end = 0;
1451         struct lustre_handle    lockh;
1452         struct ptlrpc_request   *enq_req = NULL;
1453         struct readpage_param   rp_param;
1454         int rc;
1455
1456         ENTRY;
1457
1458         *ppage = NULL;
1459
1460         LASSERT(dir != NULL);
1461         mapping = dir->i_mapping;
1462
1463         rc = mdc_intent_lock(exp, op_data, &it, &enq_req,
1464                              cb_op->md_blocking_ast, 0);
1465         if (enq_req != NULL)
1466                 ptlrpc_req_finished(enq_req);
1467
1468         if (rc < 0) {
1469                 CERROR("%s: "DFID" lock enqueue fails: rc = %d\n",
1470                        exp->exp_obd->obd_name, PFID(&op_data->op_fid1), rc);
1471                 RETURN(rc);
1472         }
1473
1474         rc = 0;
1475         lockh.cookie = it.it_lock_handle;
1476         mdc_set_lock_data(exp, &lockh, dir, NULL);
1477
1478         rp_param.rp_off = hash_offset;
1479         rp_param.rp_hash64 = op_data->op_cli_flags & CLI_HASH64;
1480         page = mdc_page_locate(mapping, &rp_param.rp_off, &start, &end,
1481                                rp_param.rp_hash64);
1482         if (IS_ERR(page)) {
1483                 CERROR("%s: dir page locate: "DFID" at %llu: rc %ld\n",
1484                        exp->exp_obd->obd_name, PFID(&op_data->op_fid1),
1485                        rp_param.rp_off, PTR_ERR(page));
1486                 GOTO(out_unlock, rc = PTR_ERR(page));
1487         } else if (page != NULL) {
1488                 /*
1489                  * XXX nikita: not entirely correct handling of a corner case:
1490                  * suppose hash chain of entries with hash value HASH crosses
1491                  * border between pages P0 and P1. First both P0 and P1 are
1492                  * cached, seekdir() is called for some entry from the P0 part
1493                  * of the chain. Later P0 goes out of cache. telldir(HASH)
1494                  * happens and finds P1, as it starts with matching hash
1495                  * value. Remaining entries from P0 part of the chain are
1496                  * skipped. (Is that really a bug?)
1497                  *
1498                  * Possible solutions: 0. don't cache P1 is such case, handle
1499                  * it as an "overflow" page. 1. invalidate all pages at
1500                  * once. 2. use HASH|1 as an index for P1.
1501                  */
1502                 GOTO(hash_collision, page);
1503         }
1504
1505         rp_param.rp_exp = exp;
1506         rp_param.rp_mod = op_data;
1507         page = read_cache_page(mapping,
1508                                hash_x_index(rp_param.rp_off,
1509                                             rp_param.rp_hash64),
1510                                mdc_read_page_remote, &rp_param);
1511         if (IS_ERR(page)) {
1512                 CDEBUG(D_INFO, "%s: read cache page: "DFID" at %llu: %ld\n",
1513                        exp->exp_obd->obd_name, PFID(&op_data->op_fid1),
1514                        rp_param.rp_off, PTR_ERR(page));
1515                 GOTO(out_unlock, rc = PTR_ERR(page));
1516         }
1517
1518         wait_on_page_locked(page);
1519         (void)kmap(page);
1520         if (!PageUptodate(page)) {
1521                 CERROR("%s: page not updated: "DFID" at %llu: rc %d\n",
1522                        exp->exp_obd->obd_name, PFID(&op_data->op_fid1),
1523                        rp_param.rp_off, -5);
1524                 goto fail;
1525         }
1526         if (!PageChecked(page))
1527                 SetPageChecked(page);
1528         if (PageError(page)) {
1529                 CERROR("%s: page error: "DFID" at %llu: rc %d\n",
1530                        exp->exp_obd->obd_name, PFID(&op_data->op_fid1),
1531                        rp_param.rp_off, -5);
1532                 goto fail;
1533         }
1534
1535 hash_collision:
1536         dp = page_address(page);
1537         if (BITS_PER_LONG == 32 && rp_param.rp_hash64) {
1538                 start = le64_to_cpu(dp->ldp_hash_start) >> 32;
1539                 end   = le64_to_cpu(dp->ldp_hash_end) >> 32;
1540                 rp_param.rp_off = hash_offset >> 32;
1541         } else {
1542                 start = le64_to_cpu(dp->ldp_hash_start);
1543                 end   = le64_to_cpu(dp->ldp_hash_end);
1544                 rp_param.rp_off = hash_offset;
1545         }
1546         if (end == start) {
1547                 LASSERT(start == rp_param.rp_off);
1548                 CWARN("Page-wide hash collision: %#lx\n", (unsigned long)end);
1549 #if BITS_PER_LONG == 32
1550                 CWARN("Real page-wide hash collision at [%llu %llu] with "
1551                       "hash %llu\n", le64_to_cpu(dp->ldp_hash_start),
1552                       le64_to_cpu(dp->ldp_hash_end), hash_offset);
1553 #endif
1554
1555                 /*
1556                  * Fetch whole overflow chain...
1557                  *
1558                  * XXX not yet.
1559                  */
1560                 goto fail;
1561         }
1562         *ppage = page;
1563 out_unlock:
1564         ldlm_lock_decref(&lockh, it.it_lock_mode);
1565         return rc;
1566 fail:
1567         kunmap(page);
1568         mdc_release_page(page, 1);
1569         rc = -EIO;
1570         goto out_unlock;
1571 }
1572
1573 static int mdc_statfs_interpret(const struct lu_env *env,
1574                                 struct ptlrpc_request *req, void *args, int rc)
1575 {
1576         struct obd_info *oinfo = args;
1577         struct obd_statfs *osfs;
1578
1579         if (!rc) {
1580                 osfs = req_capsule_server_get(&req->rq_pill, &RMF_OBD_STATFS);
1581                 if (!osfs)
1582                         return -EPROTO;
1583
1584                 oinfo->oi_osfs = osfs;
1585
1586                 CDEBUG(D_CACHE, "blocks=%llu free=%llu avail=%llu "
1587                        "objects=%llu free=%llu state=%x\n",
1588                         osfs->os_blocks, osfs->os_bfree, osfs->os_bavail,
1589                         osfs->os_files, osfs->os_ffree, osfs->os_state);
1590         }
1591
1592         oinfo->oi_cb_up(oinfo, rc);
1593
1594         return rc;
1595 }
1596
1597 static int mdc_statfs_async(struct obd_export *exp,
1598                             struct obd_info *oinfo, time64_t max_age,
1599                             struct ptlrpc_request_set *unused)
1600 {
1601         struct ptlrpc_request *req;
1602         struct obd_info *aa;
1603
1604         req = ptlrpc_request_alloc_pack(class_exp2cliimp(exp), &RQF_MDS_STATFS,
1605                                         LUSTRE_MDS_VERSION, MDS_STATFS);
1606         if (req == NULL)
1607                 return -ENOMEM;
1608
1609         ptlrpc_request_set_replen(req);
1610         req->rq_interpret_reply = mdc_statfs_interpret;
1611
1612         aa = ptlrpc_req_async_args(aa, req);
1613         *aa = *oinfo;
1614
1615         ptlrpcd_add_req(req);
1616
1617         return 0;
1618 }
1619
1620 static int mdc_statfs(const struct lu_env *env,
1621                       struct obd_export *exp, struct obd_statfs *osfs,
1622                       time64_t max_age, __u32 flags)
1623 {
1624         struct obd_device *obd = class_exp2obd(exp);
1625         struct req_format *fmt;
1626         struct ptlrpc_request *req;
1627         struct obd_statfs *msfs;
1628         struct obd_import *imp = NULL;
1629         int rc;
1630         ENTRY;
1631
1632         /*
1633          * Since the request might also come from lprocfs, so we need
1634          * sync this with client_disconnect_export Bug15684
1635          */
1636         down_read(&obd->u.cli.cl_sem);
1637         if (obd->u.cli.cl_import)
1638                 imp = class_import_get(obd->u.cli.cl_import);
1639         up_read(&obd->u.cli.cl_sem);
1640         if (!imp)
1641                 RETURN(-ENODEV);
1642
1643         fmt = &RQF_MDS_STATFS;
1644         if ((exp_connect_flags2(exp) & OBD_CONNECT2_SUM_STATFS) &&
1645             (flags & OBD_STATFS_SUM))
1646                 fmt = &RQF_MDS_STATFS_NEW;
1647         req = ptlrpc_request_alloc_pack(imp, fmt, LUSTRE_MDS_VERSION,
1648                                         MDS_STATFS);
1649         if (req == NULL)
1650                 GOTO(output, rc = -ENOMEM);
1651
1652         if ((flags & OBD_STATFS_SUM) &&
1653             (exp_connect_flags2(exp) & OBD_CONNECT2_SUM_STATFS)) {
1654                 /* request aggregated states */
1655                 struct mdt_body *body;
1656
1657                 body = req_capsule_client_get(&req->rq_pill, &RMF_MDT_BODY);
1658                 if (body == NULL)
1659                         GOTO(out, rc = -EPROTO);
1660                 body->mbo_valid = OBD_MD_FLAGSTATFS;
1661         }
1662
1663         ptlrpc_request_set_replen(req);
1664
1665         if (flags & OBD_STATFS_NODELAY) {
1666                 /* procfs requests not want stay in wait for avoid deadlock */
1667                 req->rq_no_resend = 1;
1668                 req->rq_no_delay = 1;
1669         }
1670
1671         rc = ptlrpc_queue_wait(req);
1672         if (rc) {
1673                 /* check connection error first */
1674                 if (imp->imp_connect_error)
1675                         rc = imp->imp_connect_error;
1676                 GOTO(out, rc);
1677         }
1678
1679         msfs = req_capsule_server_get(&req->rq_pill, &RMF_OBD_STATFS);
1680         if (msfs == NULL)
1681                 GOTO(out, rc = -EPROTO);
1682
1683         *osfs = *msfs;
1684         EXIT;
1685 out:
1686         ptlrpc_req_finished(req);
1687 output:
1688         class_import_put(imp);
1689         return rc;
1690 }
1691
1692 static int mdc_ioc_fid2path(struct obd_export *exp, struct getinfo_fid2path *gf)
1693 {
1694         __u32 keylen, vallen;
1695         void *key;
1696         int rc;
1697
1698         if (gf->gf_pathlen > PATH_MAX)
1699                 RETURN(-ENAMETOOLONG);
1700         if (gf->gf_pathlen < 2)
1701                 RETURN(-EOVERFLOW);
1702
1703         /* Key is KEY_FID2PATH + getinfo_fid2path description */
1704         keylen = cfs_size_round(sizeof(KEY_FID2PATH) + sizeof(*gf) +
1705                                 sizeof(struct lu_fid));
1706         OBD_ALLOC(key, keylen);
1707         if (key == NULL)
1708                 RETURN(-ENOMEM);
1709         memcpy(key, KEY_FID2PATH, sizeof(KEY_FID2PATH));
1710         memcpy(key + cfs_size_round(sizeof(KEY_FID2PATH)), gf, sizeof(*gf));
1711         memcpy(key + cfs_size_round(sizeof(KEY_FID2PATH)) + sizeof(*gf),
1712                gf->gf_u.gf_root_fid, sizeof(struct lu_fid));
1713         CDEBUG(D_IOCTL, "path get "DFID" from %llu #%d\n",
1714                PFID(&gf->gf_fid), gf->gf_recno, gf->gf_linkno);
1715
1716         if (!fid_is_sane(&gf->gf_fid))
1717                 GOTO(out, rc = -EINVAL);
1718
1719         /* Val is struct getinfo_fid2path result plus path */
1720         vallen = sizeof(*gf) + gf->gf_pathlen;
1721
1722         rc = obd_get_info(NULL, exp, keylen, key, &vallen, gf);
1723         if (rc != 0 && rc != -EREMOTE)
1724                 GOTO(out, rc);
1725
1726         if (vallen <= sizeof(*gf))
1727                 GOTO(out, rc = -EPROTO);
1728         if (vallen > sizeof(*gf) + gf->gf_pathlen)
1729                 GOTO(out, rc = -EOVERFLOW);
1730
1731         CDEBUG(D_IOCTL, "path got "DFID" from %llu #%d: %s\n",
1732                PFID(&gf->gf_fid), gf->gf_recno, gf->gf_linkno,
1733                gf->gf_pathlen < 512 ? gf->gf_u.gf_path :
1734                /* only log the last 512 characters of the path */
1735                gf->gf_u.gf_path + gf->gf_pathlen - 512);
1736
1737 out:
1738         OBD_FREE(key, keylen);
1739         return rc;
1740 }
1741
1742 static int mdc_ioc_hsm_progress(struct obd_export *exp,
1743                                 struct hsm_progress_kernel *hpk)
1744 {
1745         struct obd_import               *imp = class_exp2cliimp(exp);
1746         struct hsm_progress_kernel      *req_hpk;
1747         struct ptlrpc_request           *req;
1748         int                              rc;
1749         ENTRY;
1750
1751         req = ptlrpc_request_alloc_pack(imp, &RQF_MDS_HSM_PROGRESS,
1752                                         LUSTRE_MDS_VERSION, MDS_HSM_PROGRESS);
1753         if (req == NULL)
1754                 GOTO(out, rc = -ENOMEM);
1755
1756         mdc_pack_body(req, NULL, 0, 0, -1, 0);
1757
1758         /* Copy hsm_progress struct */
1759         req_hpk = req_capsule_client_get(&req->rq_pill, &RMF_MDS_HSM_PROGRESS);
1760         if (req_hpk == NULL)
1761                 GOTO(out, rc = -EPROTO);
1762
1763         *req_hpk = *hpk;
1764         req_hpk->hpk_errval = lustre_errno_hton(hpk->hpk_errval);
1765
1766         ptlrpc_request_set_replen(req);
1767
1768         ptlrpc_get_mod_rpc_slot(req);
1769         rc = ptlrpc_queue_wait(req);
1770         ptlrpc_put_mod_rpc_slot(req);
1771
1772         GOTO(out, rc);
1773 out:
1774         ptlrpc_req_finished(req);
1775         return rc;
1776 }
1777 /**
1778  * Send hsm_ct_register to MDS
1779  *
1780  * \param[in]   imp             import
1781  * \param[in]   archive_count   if in bitmap format, it is the bitmap,
1782  *                              else it is the count of archive_ids
1783  * \param[in]   archives        if in bitmap format, it is NULL,
1784  *                              else it is archive_id lists
1785  */
1786 static int mdc_ioc_hsm_ct_register(struct obd_import *imp, __u32 archive_count,
1787                                    __u32 *archives)
1788 {
1789         struct ptlrpc_request *req;
1790         __u32 *archive_array;
1791         size_t archives_size;
1792         int rc;
1793         ENTRY;
1794
1795         req = ptlrpc_request_alloc(imp, &RQF_MDS_HSM_CT_REGISTER);
1796         if (req == NULL)
1797                 RETURN(-ENOMEM);
1798
1799         if (archives != NULL)
1800                 archives_size = sizeof(*archive_array) * archive_count;
1801         else
1802                 archives_size = sizeof(archive_count);
1803
1804         req_capsule_set_size(&req->rq_pill, &RMF_MDS_HSM_ARCHIVE,
1805                              RCL_CLIENT, archives_size);
1806
1807         rc = ptlrpc_request_pack(req, LUSTRE_MDS_VERSION, MDS_HSM_CT_REGISTER);
1808         if (rc) {
1809                 ptlrpc_request_free(req);
1810                 RETURN(-ENOMEM);
1811         }
1812
1813         mdc_pack_body(req, NULL, 0, 0, -1, 0);
1814
1815         archive_array = req_capsule_client_get(&req->rq_pill,
1816                                                &RMF_MDS_HSM_ARCHIVE);
1817         if (archive_array == NULL)
1818                 GOTO(out, rc = -EPROTO);
1819
1820         if (archives != NULL)
1821                 memcpy(archive_array, archives, archives_size);
1822         else
1823                 *archive_array = archive_count;
1824
1825         ptlrpc_request_set_replen(req);
1826
1827         rc = mdc_queue_wait(req);
1828         GOTO(out, rc);
1829 out:
1830         ptlrpc_req_finished(req);
1831         return rc;
1832 }
1833
1834 static int mdc_ioc_hsm_current_action(struct obd_export *exp,
1835                                       struct md_op_data *op_data)
1836 {
1837         struct hsm_current_action       *hca = op_data->op_data;
1838         struct hsm_current_action       *req_hca;
1839         struct ptlrpc_request           *req;
1840         int                              rc;
1841         ENTRY;
1842
1843         req = ptlrpc_request_alloc(class_exp2cliimp(exp),
1844                                    &RQF_MDS_HSM_ACTION);
1845         if (req == NULL)
1846                 RETURN(-ENOMEM);
1847
1848         rc = ptlrpc_request_pack(req, LUSTRE_MDS_VERSION, MDS_HSM_ACTION);
1849         if (rc) {
1850                 ptlrpc_request_free(req);
1851                 RETURN(rc);
1852         }
1853
1854         mdc_pack_body(req, &op_data->op_fid1, 0, 0,
1855                       op_data->op_suppgids[0], 0);
1856
1857         ptlrpc_request_set_replen(req);
1858
1859         rc = mdc_queue_wait(req);
1860         if (rc)
1861                 GOTO(out, rc);
1862
1863         req_hca = req_capsule_server_get(&req->rq_pill,
1864                                          &RMF_MDS_HSM_CURRENT_ACTION);
1865         if (req_hca == NULL)
1866                 GOTO(out, rc = -EPROTO);
1867
1868         *hca = *req_hca;
1869
1870         EXIT;
1871 out:
1872         ptlrpc_req_finished(req);
1873         return rc;
1874 }
1875
1876 static int mdc_ioc_hsm_ct_unregister(struct obd_import *imp)
1877 {
1878         struct ptlrpc_request   *req;
1879         int                      rc;
1880         ENTRY;
1881
1882         req = ptlrpc_request_alloc_pack(imp, &RQF_MDS_HSM_CT_UNREGISTER,
1883                                         LUSTRE_MDS_VERSION,
1884                                         MDS_HSM_CT_UNREGISTER);
1885         if (req == NULL)
1886                 GOTO(out, rc = -ENOMEM);
1887
1888         mdc_pack_body(req, NULL, 0, 0, -1, 0);
1889
1890         ptlrpc_request_set_replen(req);
1891
1892         rc = mdc_queue_wait(req);
1893         GOTO(out, rc);
1894 out:
1895         ptlrpc_req_finished(req);
1896         return rc;
1897 }
1898
1899 static int mdc_ioc_hsm_state_get(struct obd_export *exp,
1900                                  struct md_op_data *op_data)
1901 {
1902         struct hsm_user_state   *hus = op_data->op_data;
1903         struct hsm_user_state   *req_hus;
1904         struct ptlrpc_request   *req;
1905         int                      rc;
1906         ENTRY;
1907
1908         req = ptlrpc_request_alloc(class_exp2cliimp(exp),
1909                                    &RQF_MDS_HSM_STATE_GET);
1910         if (req == NULL)
1911                 RETURN(-ENOMEM);
1912
1913         rc = ptlrpc_request_pack(req, LUSTRE_MDS_VERSION, MDS_HSM_STATE_GET);
1914         if (rc != 0) {
1915                 ptlrpc_request_free(req);
1916                 RETURN(rc);
1917         }
1918
1919         mdc_pack_body(req, &op_data->op_fid1, 0, 0,
1920                       op_data->op_suppgids[0], 0);
1921
1922         ptlrpc_request_set_replen(req);
1923
1924         rc = mdc_queue_wait(req);
1925         if (rc)
1926                 GOTO(out, rc);
1927
1928         req_hus = req_capsule_server_get(&req->rq_pill, &RMF_HSM_USER_STATE);
1929         if (req_hus == NULL)
1930                 GOTO(out, rc = -EPROTO);
1931
1932         *hus = *req_hus;
1933
1934         EXIT;
1935 out:
1936         ptlrpc_req_finished(req);
1937         return rc;
1938 }
1939
1940 static int mdc_ioc_hsm_state_set(struct obd_export *exp,
1941                                  struct md_op_data *op_data)
1942 {
1943         struct hsm_state_set    *hss = op_data->op_data;
1944         struct hsm_state_set    *req_hss;
1945         struct ptlrpc_request   *req;
1946         int                      rc;
1947         ENTRY;
1948
1949         req = ptlrpc_request_alloc(class_exp2cliimp(exp),
1950                                    &RQF_MDS_HSM_STATE_SET);
1951         if (req == NULL)
1952                 RETURN(-ENOMEM);
1953
1954         rc = ptlrpc_request_pack(req, LUSTRE_MDS_VERSION, MDS_HSM_STATE_SET);
1955         if (rc) {
1956                 ptlrpc_request_free(req);
1957                 RETURN(rc);
1958         }
1959
1960         mdc_pack_body(req, &op_data->op_fid1, 0, 0,
1961                       op_data->op_suppgids[0], 0);
1962
1963         /* Copy states */
1964         req_hss = req_capsule_client_get(&req->rq_pill, &RMF_HSM_STATE_SET);
1965         if (req_hss == NULL)
1966                 GOTO(out, rc = -EPROTO);
1967         *req_hss = *hss;
1968
1969         ptlrpc_request_set_replen(req);
1970
1971         ptlrpc_get_mod_rpc_slot(req);
1972         rc = ptlrpc_queue_wait(req);
1973         ptlrpc_put_mod_rpc_slot(req);
1974
1975         GOTO(out, rc);
1976 out:
1977         ptlrpc_req_finished(req);
1978         return rc;
1979 }
1980
1981 static int mdc_ioc_hsm_request(struct obd_export *exp,
1982                                struct hsm_user_request *hur)
1983 {
1984         struct obd_import       *imp = class_exp2cliimp(exp);
1985         struct ptlrpc_request   *req;
1986         struct hsm_request      *req_hr;
1987         struct hsm_user_item    *req_hui;
1988         char                    *req_opaque;
1989         int                      rc;
1990         ENTRY;
1991
1992         req = ptlrpc_request_alloc(imp, &RQF_MDS_HSM_REQUEST);
1993         if (req == NULL)
1994                 GOTO(out, rc = -ENOMEM);
1995
1996         req_capsule_set_size(&req->rq_pill, &RMF_MDS_HSM_USER_ITEM, RCL_CLIENT,
1997                              hur->hur_request.hr_itemcount
1998                              * sizeof(struct hsm_user_item));
1999         req_capsule_set_size(&req->rq_pill, &RMF_GENERIC_DATA, RCL_CLIENT,
2000                              hur->hur_request.hr_data_len);
2001
2002         rc = ptlrpc_request_pack(req, LUSTRE_MDS_VERSION, MDS_HSM_REQUEST);
2003         if (rc) {
2004                 ptlrpc_request_free(req);
2005                 RETURN(rc);
2006         }
2007
2008         mdc_pack_body(req, NULL, 0, 0, -1, 0);
2009
2010         /* Copy hsm_request struct */
2011         req_hr = req_capsule_client_get(&req->rq_pill, &RMF_MDS_HSM_REQUEST);
2012         if (req_hr == NULL)
2013                 GOTO(out, rc = -EPROTO);
2014         *req_hr = hur->hur_request;
2015
2016         /* Copy hsm_user_item structs */
2017         req_hui = req_capsule_client_get(&req->rq_pill, &RMF_MDS_HSM_USER_ITEM);
2018         if (req_hui == NULL)
2019                 GOTO(out, rc = -EPROTO);
2020         memcpy(req_hui, hur->hur_user_item,
2021                hur->hur_request.hr_itemcount * sizeof(struct hsm_user_item));
2022
2023         /* Copy opaque field */
2024         req_opaque = req_capsule_client_get(&req->rq_pill, &RMF_GENERIC_DATA);
2025         if (req_opaque == NULL)
2026                 GOTO(out, rc = -EPROTO);
2027         memcpy(req_opaque, hur_data(hur), hur->hur_request.hr_data_len);
2028
2029         ptlrpc_request_set_replen(req);
2030
2031         ptlrpc_get_mod_rpc_slot(req);
2032         rc = ptlrpc_queue_wait(req);
2033         ptlrpc_put_mod_rpc_slot(req);
2034
2035         GOTO(out, rc);
2036
2037 out:
2038         ptlrpc_req_finished(req);
2039         return rc;
2040 }
2041
2042 static int mdc_ioc_hsm_ct_start(struct obd_export *exp,
2043                                 struct lustre_kernelcomm *lk);
2044
2045 static int mdc_quotactl(struct obd_device *unused, struct obd_export *exp,
2046                         struct obd_quotactl *oqctl)
2047 {
2048         struct ptlrpc_request   *req;
2049         struct obd_quotactl     *oqc;
2050         int                      rc;
2051         ENTRY;
2052
2053         req = ptlrpc_request_alloc_pack(class_exp2cliimp(exp),
2054                                         &RQF_MDS_QUOTACTL, LUSTRE_MDS_VERSION,
2055                                         MDS_QUOTACTL);
2056         if (req == NULL)
2057                 RETURN(-ENOMEM);
2058
2059         oqc = req_capsule_client_get(&req->rq_pill, &RMF_OBD_QUOTACTL);
2060         *oqc = *oqctl;
2061
2062         ptlrpc_request_set_replen(req);
2063         ptlrpc_at_set_req_timeout(req);
2064
2065         rc = ptlrpc_queue_wait(req);
2066         if (rc)
2067                 CERROR("ptlrpc_queue_wait failed, rc: %d\n", rc);
2068
2069         if (req->rq_repmsg &&
2070             (oqc = req_capsule_server_get(&req->rq_pill, &RMF_OBD_QUOTACTL))) {
2071                 *oqctl = *oqc;
2072         } else if (!rc) {
2073                 CERROR ("Can't unpack obd_quotactl\n");
2074                 rc = -EPROTO;
2075         }
2076         ptlrpc_req_finished(req);
2077
2078         RETURN(rc);
2079 }
2080
2081 static int mdc_ioc_swap_layouts(struct obd_export *exp,
2082                                 struct md_op_data *op_data)
2083 {
2084         LIST_HEAD(cancels);
2085         struct ptlrpc_request   *req;
2086         int                      rc, count;
2087         struct mdc_swap_layouts *msl, *payload;
2088         ENTRY;
2089
2090         msl = op_data->op_data;
2091
2092         /* When the MDT will get the MDS_SWAP_LAYOUTS RPC the
2093          * first thing it will do is to cancel the 2 layout
2094          * locks held by this client.
2095          * So the client must cancel its layout locks on the 2 fids
2096          * with the request RPC to avoid extra RPC round trips.
2097          */
2098         count = mdc_resource_get_unused(exp, &op_data->op_fid1, &cancels,
2099                                         LCK_EX, MDS_INODELOCK_LAYOUT |
2100                                         MDS_INODELOCK_XATTR);
2101         count += mdc_resource_get_unused(exp, &op_data->op_fid2, &cancels,
2102                                          LCK_EX, MDS_INODELOCK_LAYOUT |
2103                                          MDS_INODELOCK_XATTR);
2104
2105         req = ptlrpc_request_alloc(class_exp2cliimp(exp),
2106                                    &RQF_MDS_SWAP_LAYOUTS);
2107         if (req == NULL) {
2108                 ldlm_lock_list_put(&cancels, l_bl_ast, count);
2109                 RETURN(-ENOMEM);
2110         }
2111
2112         rc = mdc_prep_elc_req(exp, req, MDS_SWAP_LAYOUTS, &cancels, count);
2113         if (rc) {
2114                 ptlrpc_request_free(req);
2115                 RETURN(rc);
2116         }
2117
2118         mdc_swap_layouts_pack(req, op_data);
2119
2120         payload = req_capsule_client_get(&req->rq_pill, &RMF_SWAP_LAYOUTS);
2121         LASSERT(payload);
2122
2123         *payload = *msl;
2124
2125         ptlrpc_request_set_replen(req);
2126
2127         rc = ptlrpc_queue_wait(req);
2128         if (rc)
2129                 GOTO(out, rc);
2130         EXIT;
2131
2132 out:
2133         ptlrpc_req_finished(req);
2134         return rc;
2135 }
2136
2137 static int mdc_iocontrol(unsigned int cmd, struct obd_export *exp, int len,
2138                          void *karg, void __user *uarg)
2139 {
2140         struct obd_device *obd = exp->exp_obd;
2141         struct obd_ioctl_data *data = karg;
2142         struct obd_import *imp = obd->u.cli.cl_import;
2143         int rc;
2144         ENTRY;
2145
2146         if (!try_module_get(THIS_MODULE)) {
2147                 CERROR("%s: cannot get module '%s'\n", obd->obd_name,
2148                        module_name(THIS_MODULE));
2149                 return -EINVAL;
2150         }
2151         switch (cmd) {
2152         case OBD_IOC_FID2PATH:
2153                 rc = mdc_ioc_fid2path(exp, karg);
2154                 GOTO(out, rc);
2155         case LL_IOC_HSM_CT_START:
2156                 rc = mdc_ioc_hsm_ct_start(exp, karg);
2157                 /* ignore if it was already registered on this MDS. */
2158                 if (rc == -EEXIST)
2159                         rc = 0;
2160                 GOTO(out, rc);
2161         case LL_IOC_HSM_PROGRESS:
2162                 rc = mdc_ioc_hsm_progress(exp, karg);
2163                 GOTO(out, rc);
2164         case LL_IOC_HSM_STATE_GET:
2165                 rc = mdc_ioc_hsm_state_get(exp, karg);
2166                 GOTO(out, rc);
2167         case LL_IOC_HSM_STATE_SET:
2168                 rc = mdc_ioc_hsm_state_set(exp, karg);
2169                 GOTO(out, rc);
2170         case LL_IOC_HSM_ACTION:
2171                 rc = mdc_ioc_hsm_current_action(exp, karg);
2172                 GOTO(out, rc);
2173         case LL_IOC_HSM_REQUEST:
2174                 rc = mdc_ioc_hsm_request(exp, karg);
2175                 GOTO(out, rc);
2176         case OBD_IOC_CLIENT_RECOVER:
2177                 rc = ptlrpc_recover_import(imp, data->ioc_inlbuf1, 0);
2178                 if (rc < 0)
2179                         GOTO(out, rc);
2180                 GOTO(out, rc = 0);
2181         case IOC_OSC_SET_ACTIVE:
2182                 rc = ptlrpc_set_import_active(imp, data->ioc_offset);
2183                 GOTO(out, rc);
2184         /*
2185          * Normally IOC_OBD_STATFS, OBD_IOC_QUOTACTL iocontrol are handled by
2186          * LMV instead of MDC. But when the cluster is upgraded from 1.8,
2187          * there'd be no LMV layer thus we might be called here. Eventually
2188          * this code should be removed.
2189          * bz20731, LU-592.
2190          */
2191         case IOC_OBD_STATFS: {
2192                 struct obd_statfs stat_buf = {0};
2193
2194                 if (*((__u32 *) data->ioc_inlbuf2) != 0)
2195                         GOTO(out, rc = -ENODEV);
2196
2197                 /* copy UUID */
2198                 if (copy_to_user(data->ioc_pbuf2, obd2cli_tgt(obd),
2199                                  min((int)data->ioc_plen2,
2200                                      (int)sizeof(struct obd_uuid))))
2201                         GOTO(out, rc = -EFAULT);
2202
2203                 rc = mdc_statfs(NULL, obd->obd_self_export, &stat_buf,
2204                                 ktime_get_seconds() - OBD_STATFS_CACHE_SECONDS,
2205                                 0);
2206                 if (rc != 0)
2207                         GOTO(out, rc);
2208
2209                 if (copy_to_user(data->ioc_pbuf1, &stat_buf,
2210                                      min((int) data->ioc_plen1,
2211                                          (int) sizeof(stat_buf))))
2212                         GOTO(out, rc = -EFAULT);
2213
2214                 GOTO(out, rc = 0);
2215         }
2216         case OBD_IOC_QUOTACTL: {
2217                 struct if_quotactl *qctl = karg;
2218                 struct obd_quotactl *oqctl;
2219
2220                 OBD_ALLOC_PTR(oqctl);
2221                 if (oqctl == NULL)
2222                         GOTO(out, rc = -ENOMEM);
2223
2224                 QCTL_COPY(oqctl, qctl);
2225                 rc = obd_quotactl(exp, oqctl);
2226                 if (rc == 0) {
2227                         QCTL_COPY(qctl, oqctl);
2228                         qctl->qc_valid = QC_MDTIDX;
2229                         qctl->obd_uuid = obd->u.cli.cl_target_uuid;
2230                 }
2231
2232                 OBD_FREE_PTR(oqctl);
2233                 GOTO(out, rc);
2234         }
2235         case LL_IOC_GET_CONNECT_FLAGS:
2236                 if (copy_to_user(uarg, exp_connect_flags_ptr(exp),
2237                                  sizeof(*exp_connect_flags_ptr(exp))))
2238                         GOTO(out, rc = -EFAULT);
2239
2240                 GOTO(out, rc = 0);
2241         case LL_IOC_LOV_SWAP_LAYOUTS:
2242                 rc = mdc_ioc_swap_layouts(exp, karg);
2243                 GOTO(out, rc);
2244         default:
2245                 CERROR("unrecognised ioctl: cmd = %#x\n", cmd);
2246                 GOTO(out, rc = -ENOTTY);
2247         }
2248 out:
2249         module_put(THIS_MODULE);
2250
2251         return rc;
2252 }
2253
2254 static int mdc_get_info_rpc(struct obd_export *exp,
2255                             u32 keylen, void *key,
2256                             u32 vallen, void *val)
2257 {
2258         struct obd_import      *imp = class_exp2cliimp(exp);
2259         struct ptlrpc_request  *req;
2260         char                   *tmp;
2261         int                     rc = -EINVAL;
2262         ENTRY;
2263
2264         req = ptlrpc_request_alloc(imp, &RQF_MDS_GET_INFO);
2265         if (req == NULL)
2266                 RETURN(-ENOMEM);
2267
2268         req_capsule_set_size(&req->rq_pill, &RMF_GETINFO_KEY,
2269                              RCL_CLIENT, keylen);
2270         req_capsule_set_size(&req->rq_pill, &RMF_GETINFO_VALLEN,
2271                              RCL_CLIENT, sizeof(vallen));
2272
2273         rc = ptlrpc_request_pack(req, LUSTRE_MDS_VERSION, MDS_GET_INFO);
2274         if (rc) {
2275                 ptlrpc_request_free(req);
2276                 RETURN(rc);
2277         }
2278
2279         tmp = req_capsule_client_get(&req->rq_pill, &RMF_GETINFO_KEY);
2280         memcpy(tmp, key, keylen);
2281         tmp = req_capsule_client_get(&req->rq_pill, &RMF_GETINFO_VALLEN);
2282         memcpy(tmp, &vallen, sizeof(vallen));
2283
2284         req_capsule_set_size(&req->rq_pill, &RMF_GETINFO_VAL,
2285                              RCL_SERVER, vallen);
2286         ptlrpc_request_set_replen(req);
2287
2288         rc = ptlrpc_queue_wait(req);
2289         /* -EREMOTE means the get_info result is partial, and it needs to
2290          * continue on another MDT, see fid2path part in lmv_iocontrol */
2291         if (rc == 0 || rc == -EREMOTE) {
2292                 tmp = req_capsule_server_get(&req->rq_pill, &RMF_GETINFO_VAL);
2293                 memcpy(val, tmp, vallen);
2294                 if (ptlrpc_rep_need_swab(req)) {
2295                         if (KEY_IS(KEY_FID2PATH))
2296                                 lustre_swab_fid2path(val);
2297                 }
2298         }
2299         ptlrpc_req_finished(req);
2300
2301         RETURN(rc);
2302 }
2303
2304 static void lustre_swab_hai(struct hsm_action_item *h)
2305 {
2306         __swab32s(&h->hai_len);
2307         __swab32s(&h->hai_action);
2308         lustre_swab_lu_fid(&h->hai_fid);
2309         lustre_swab_lu_fid(&h->hai_dfid);
2310         __swab64s(&h->hai_cookie);
2311         __swab64s(&h->hai_extent.offset);
2312         __swab64s(&h->hai_extent.length);
2313         __swab64s(&h->hai_gid);
2314 }
2315
2316 static void lustre_swab_hal(struct hsm_action_list *h)
2317 {
2318         struct hsm_action_item  *hai;
2319         __u32                    i;
2320
2321         __swab32s(&h->hal_version);
2322         __swab32s(&h->hal_count);
2323         __swab32s(&h->hal_archive_id);
2324         __swab64s(&h->hal_flags);
2325         hai = hai_first(h);
2326         for (i = 0; i < h->hal_count; i++, hai = hai_next(hai))
2327                 lustre_swab_hai(hai);
2328 }
2329
2330 static void lustre_swab_kuch(struct kuc_hdr *l)
2331 {
2332         __swab16s(&l->kuc_magic);
2333         /* __u8 l->kuc_transport */
2334         __swab16s(&l->kuc_msgtype);
2335         __swab16s(&l->kuc_msglen);
2336 }
2337
2338 static int mdc_ioc_hsm_ct_start(struct obd_export *exp,
2339                                 struct lustre_kernelcomm *lk)
2340 {
2341         struct obd_import *imp = class_exp2cliimp(exp);
2342         int rc = 0;
2343
2344         if (lk->lk_group != KUC_GRP_HSM) {
2345                 CERROR("Bad copytool group %d\n", lk->lk_group);
2346                 return -EINVAL;
2347         }
2348
2349         CDEBUG(D_HSM, "CT start r%d w%d u%d g%d f%#x\n", lk->lk_rfd, lk->lk_wfd,
2350                lk->lk_uid, lk->lk_group, lk->lk_flags);
2351
2352         if (lk->lk_flags & LK_FLG_STOP) {
2353                 /* Unregister with the coordinator */
2354                 rc = mdc_ioc_hsm_ct_unregister(imp);
2355         } else {
2356                 __u32 *archives = NULL;
2357
2358                 if ((lk->lk_flags & LK_FLG_DATANR) && lk->lk_data_count > 0)
2359                         archives = lk->lk_data;
2360
2361                 rc = mdc_ioc_hsm_ct_register(imp, lk->lk_data_count, archives);
2362         }
2363
2364         return rc;
2365 }
2366
2367 /**
2368  * Send a message to any listening copytools
2369  * @param val KUC message (kuc_hdr + hsm_action_list)
2370  * @param len total length of message
2371  */
2372 static int mdc_hsm_copytool_send(const struct obd_uuid *uuid,
2373                                  size_t len, void *val)
2374 {
2375         struct kuc_hdr          *lh = (struct kuc_hdr *)val;
2376         struct hsm_action_list  *hal = (struct hsm_action_list *)(lh + 1);
2377         int                      rc;
2378         ENTRY;
2379
2380         if (len < sizeof(*lh) + sizeof(*hal)) {
2381                 CERROR("Short HSM message %zu < %zu\n", len,
2382                        sizeof(*lh) + sizeof(*hal));
2383                 RETURN(-EPROTO);
2384         }
2385         if (lh->kuc_magic == __swab16(KUC_MAGIC)) {
2386                 lustre_swab_kuch(lh);
2387                 lustre_swab_hal(hal);
2388         } else if (lh->kuc_magic != KUC_MAGIC) {
2389                 CERROR("Bad magic %x!=%x\n", lh->kuc_magic, KUC_MAGIC);
2390                 RETURN(-EPROTO);
2391         }
2392
2393         CDEBUG(D_HSM, " Received message mg=%x t=%d m=%d l=%d actions=%d "
2394                "on %s\n",
2395                lh->kuc_magic, lh->kuc_transport, lh->kuc_msgtype,
2396                lh->kuc_msglen, hal->hal_count, hal->hal_fsname);
2397
2398         /* Broadcast to HSM listeners */
2399         rc = libcfs_kkuc_group_put(uuid, KUC_GRP_HSM, lh);
2400
2401         RETURN(rc);
2402 }
2403
2404 /**
2405  * callback function passed to kuc for re-registering each HSM copytool
2406  * running on MDC, after MDT shutdown/recovery.
2407  * @param data copytool registration data
2408  * @param cb_arg callback argument (obd_import)
2409  */
2410 static int mdc_hsm_ct_reregister(void *data, void *cb_arg)
2411 {
2412         struct obd_import *imp = (struct obd_import *)cb_arg;
2413         struct kkuc_ct_data *kcd = data;
2414         __u32 *archives = NULL;
2415         int rc;
2416
2417         if (kcd == NULL ||
2418             (kcd->kcd_magic != KKUC_CT_DATA_ARRAY_MAGIC &&
2419              kcd->kcd_magic != KKUC_CT_DATA_BITMAP_MAGIC))
2420                 return -EPROTO;
2421
2422         if (kcd->kcd_magic == KKUC_CT_DATA_BITMAP_MAGIC) {
2423                 CDEBUG(D_HA, "%s: recover copytool registration to MDT "
2424                        "(archive=%#x)\n", imp->imp_obd->obd_name,
2425                        kcd->kcd_nr_archives);
2426         } else {
2427                 CDEBUG(D_HA, "%s: recover copytool registration to MDT "
2428                        "(archive nr = %u)\n",
2429                        imp->imp_obd->obd_name, kcd->kcd_nr_archives);
2430                 if (kcd->kcd_nr_archives != 0)
2431                         archives = kcd->kcd_archives;
2432         }
2433
2434         rc = mdc_ioc_hsm_ct_register(imp, kcd->kcd_nr_archives, archives);
2435         /* ignore error if the copytool is already registered */
2436         return (rc == -EEXIST) ? 0 : rc;
2437 }
2438
2439 /**
2440  * Re-establish all kuc contexts with MDT
2441  * after MDT shutdown/recovery.
2442  */
2443 static int mdc_kuc_reregister(struct obd_import *imp)
2444 {
2445         /* re-register HSM agents */
2446         return libcfs_kkuc_group_foreach(&imp->imp_obd->obd_uuid, KUC_GRP_HSM,
2447                                          mdc_hsm_ct_reregister, imp);
2448 }
2449
2450 static int mdc_set_info_async(const struct lu_env *env,
2451                               struct obd_export *exp,
2452                               u32 keylen, void *key,
2453                               u32 vallen, void *val,
2454                               struct ptlrpc_request_set *set)
2455 {
2456         struct obd_import       *imp = class_exp2cliimp(exp);
2457         int                      rc;
2458         ENTRY;
2459
2460         if (KEY_IS(KEY_READ_ONLY)) {
2461                 if (vallen != sizeof(int))
2462                         RETURN(-EINVAL);
2463
2464                 spin_lock(&imp->imp_lock);
2465                 if (*((int *)val)) {
2466                         imp->imp_connect_flags_orig |= OBD_CONNECT_RDONLY;
2467                         imp->imp_connect_data.ocd_connect_flags |=
2468                                                         OBD_CONNECT_RDONLY;
2469                 } else {
2470                         imp->imp_connect_flags_orig &= ~OBD_CONNECT_RDONLY;
2471                         imp->imp_connect_data.ocd_connect_flags &=
2472                                                         ~OBD_CONNECT_RDONLY;
2473                 }
2474                 spin_unlock(&imp->imp_lock);
2475
2476                 rc = do_set_info_async(imp, MDS_SET_INFO, LUSTRE_MDS_VERSION,
2477                                        keylen, key, vallen, val, set);
2478                 RETURN(rc);
2479         }
2480         if (KEY_IS(KEY_CHANGELOG_CLEAR)) {
2481                 rc = do_set_info_async(imp, MDS_SET_INFO, LUSTRE_MDS_VERSION,
2482                                        keylen, key, vallen, val, set);
2483                 RETURN(rc);
2484         }
2485         if (KEY_IS(KEY_HSM_COPYTOOL_SEND)) {
2486                 rc = mdc_hsm_copytool_send(&imp->imp_obd->obd_uuid, vallen,
2487                                            val);
2488                 RETURN(rc);
2489         }
2490
2491         if (KEY_IS(KEY_DEFAULT_EASIZE)) {
2492                 __u32 *default_easize = val;
2493
2494                 exp->exp_obd->u.cli.cl_default_mds_easize = *default_easize;
2495                 RETURN(0);
2496         }
2497
2498         rc = osc_set_info_async(env, exp, keylen, key, vallen, val, set);
2499         RETURN(rc);
2500 }
2501
2502 static int mdc_get_info(const struct lu_env *env, struct obd_export *exp,
2503                         __u32 keylen, void *key, __u32 *vallen, void *val)
2504 {
2505         int rc = -EINVAL;
2506
2507         if (KEY_IS(KEY_MAX_EASIZE)) {
2508                 __u32 mdsize, *max_easize;
2509
2510                 if (*vallen != sizeof(int))
2511                         RETURN(-EINVAL);
2512                 mdsize = *(__u32 *)val;
2513                 if (mdsize > exp->exp_obd->u.cli.cl_max_mds_easize)
2514                         exp->exp_obd->u.cli.cl_max_mds_easize = mdsize;
2515                 max_easize = val;
2516                 *max_easize = exp->exp_obd->u.cli.cl_max_mds_easize;
2517                 RETURN(0);
2518         } else if (KEY_IS(KEY_DEFAULT_EASIZE)) {
2519                 __u32 *default_easize;
2520
2521                 if (*vallen != sizeof(int))
2522                         RETURN(-EINVAL);
2523                 default_easize = val;
2524                 *default_easize = exp->exp_obd->u.cli.cl_default_mds_easize;
2525                 RETURN(0);
2526         } else if (KEY_IS(KEY_CONN_DATA)) {
2527                 struct obd_import *imp = class_exp2cliimp(exp);
2528                 struct obd_connect_data *data = val;
2529
2530                 if (*vallen != sizeof(*data))
2531                         RETURN(-EINVAL);
2532
2533                 *data = imp->imp_connect_data;
2534                 RETURN(0);
2535         } else if (KEY_IS(KEY_TGT_COUNT)) {
2536                 *((__u32 *)val) = 1;
2537                 RETURN(0);
2538         }
2539
2540         rc = mdc_get_info_rpc(exp, keylen, key, *vallen, val);
2541
2542         RETURN(rc);
2543 }
2544
2545 static int mdc_fsync(struct obd_export *exp, const struct lu_fid *fid,
2546                      struct ptlrpc_request **request)
2547 {
2548         struct ptlrpc_request *req;
2549         int                    rc;
2550         ENTRY;
2551
2552         *request = NULL;
2553         req = ptlrpc_request_alloc(class_exp2cliimp(exp), &RQF_MDS_SYNC);
2554         if (req == NULL)
2555                 RETURN(-ENOMEM);
2556
2557         rc = ptlrpc_request_pack(req, LUSTRE_MDS_VERSION, MDS_SYNC);
2558         if (rc) {
2559                 ptlrpc_request_free(req);
2560                 RETURN(rc);
2561         }
2562
2563         mdc_pack_body(req, fid, 0, 0, -1, 0);
2564
2565         ptlrpc_request_set_replen(req);
2566
2567         rc = ptlrpc_queue_wait(req);
2568         if (rc)
2569                 ptlrpc_req_finished(req);
2570         else
2571                 *request = req;
2572         RETURN(rc);
2573 }
2574
2575 struct mdc_rmfid_args {
2576         int *mra_rcs;
2577         int mra_nr;
2578 };
2579
2580 int mdc_rmfid_interpret(const struct lu_env *env, struct ptlrpc_request *req,
2581                           void *args, int rc)
2582 {
2583         struct mdc_rmfid_args *aa;
2584         int *rcs, size;
2585         ENTRY;
2586
2587         if (!rc) {
2588                 aa = ptlrpc_req_async_args(aa, req);
2589
2590                 size = req_capsule_get_size(&req->rq_pill, &RMF_RCS,
2591                                             RCL_SERVER);
2592                 LASSERT(size == sizeof(int) * aa->mra_nr);
2593                 rcs = req_capsule_server_get(&req->rq_pill, &RMF_RCS);
2594                 LASSERT(rcs);
2595                 LASSERT(aa->mra_rcs);
2596                 LASSERT(aa->mra_nr);
2597                 memcpy(aa->mra_rcs, rcs, size);
2598         }
2599
2600         RETURN(rc);
2601 }
2602
2603 static int mdc_rmfid(struct obd_export *exp, struct fid_array *fa,
2604                      int *rcs, struct ptlrpc_request_set *set)
2605 {
2606         struct ptlrpc_request *req;
2607         struct mdc_rmfid_args *aa;
2608         struct mdt_body *b;
2609         struct lu_fid *tmp;
2610         int rc, flen;
2611         ENTRY;
2612
2613         req = ptlrpc_request_alloc(class_exp2cliimp(exp), &RQF_MDS_RMFID);
2614         if (req == NULL)
2615                 RETURN(-ENOMEM);
2616
2617         flen = fa->fa_nr * sizeof(struct lu_fid);
2618         req_capsule_set_size(&req->rq_pill, &RMF_FID_ARRAY,
2619                              RCL_CLIENT, flen);
2620         req_capsule_set_size(&req->rq_pill, &RMF_FID_ARRAY,
2621                              RCL_SERVER, flen);
2622         req_capsule_set_size(&req->rq_pill, &RMF_RCS,
2623                              RCL_SERVER, fa->fa_nr * sizeof(__u32));
2624         rc = ptlrpc_request_pack(req, LUSTRE_MDS_VERSION, MDS_RMFID);
2625         if (rc) {
2626                 ptlrpc_request_free(req);
2627                 RETURN(rc);
2628         }
2629         tmp = req_capsule_client_get(&req->rq_pill, &RMF_FID_ARRAY);
2630         memcpy(tmp, fa->fa_fids, flen);
2631
2632         mdc_pack_body(req, NULL, 0, 0, -1, 0);
2633         b = req_capsule_client_get(&req->rq_pill, &RMF_MDT_BODY);
2634         b->mbo_ctime = ktime_get_real_seconds();
2635
2636         ptlrpc_request_set_replen(req);
2637
2638         LASSERT(rcs);
2639         aa = ptlrpc_req_async_args(aa, req);
2640         aa->mra_rcs = rcs;
2641         aa->mra_nr = fa->fa_nr;
2642         req->rq_interpret_reply = mdc_rmfid_interpret;
2643
2644         ptlrpc_set_add_req(set, req);
2645         ptlrpc_check_set(NULL, set);
2646
2647         RETURN(rc);
2648 }
2649
2650 static int mdc_import_event(struct obd_device *obd, struct obd_import *imp,
2651                             enum obd_import_event event)
2652 {
2653         struct client_obd *cli = &obd->u.cli;
2654         int rc = 0;
2655
2656         LASSERT(imp->imp_obd == obd);
2657
2658         switch (event) {
2659         case IMP_EVENT_DISCON:
2660                 spin_lock(&cli->cl_loi_list_lock);
2661                 cli->cl_avail_grant = 0;
2662                 cli->cl_lost_grant = 0;
2663                 spin_unlock(&cli->cl_loi_list_lock);
2664                 break;
2665         case IMP_EVENT_INACTIVE:
2666                 /*
2667                  * Flush current sequence to make client obtain new one
2668                  * from server in case of disconnect/reconnect.
2669                  */
2670                 down_read(&cli->cl_seq_rwsem);
2671                 if (cli->cl_seq)
2672                         seq_client_flush(cli->cl_seq);
2673                 up_read(&cli->cl_seq_rwsem);
2674
2675                 rc = obd_notify_observer(obd, obd, OBD_NOTIFY_INACTIVE);
2676                 break;
2677         case IMP_EVENT_INVALIDATE: {
2678                 struct ldlm_namespace *ns = obd->obd_namespace;
2679                 struct lu_env *env;
2680                 __u16 refcheck;
2681
2682                 ldlm_namespace_cleanup(ns, LDLM_FL_LOCAL_ONLY);
2683
2684                 env = cl_env_get(&refcheck);
2685                 if (!IS_ERR(env)) {
2686                         /* Reset grants. All pages go to failing rpcs due to
2687                          * the invalid import.
2688                          */
2689                         osc_io_unplug(env, cli, NULL);
2690
2691                         cfs_hash_for_each_nolock(ns->ns_rs_hash,
2692                                                  osc_ldlm_resource_invalidate,
2693                                                  env, 0);
2694                         cl_env_put(env, &refcheck);
2695                         ldlm_namespace_cleanup(ns, LDLM_FL_LOCAL_ONLY);
2696                 } else {
2697                         rc = PTR_ERR(env);
2698                 }
2699                 break;
2700         }
2701         case IMP_EVENT_ACTIVE:
2702                 rc = obd_notify_observer(obd, obd, OBD_NOTIFY_ACTIVE);
2703                 /* redo the kuc registration after reconnecting */
2704                 if (rc == 0)
2705                         rc = mdc_kuc_reregister(imp);
2706                 break;
2707         case IMP_EVENT_OCD: {
2708                 struct obd_connect_data *ocd = &imp->imp_connect_data;
2709
2710                 if (OCD_HAS_FLAG(ocd, GRANT))
2711                         osc_init_grant(cli, ocd);
2712
2713                 rc = obd_notify_observer(obd, obd, OBD_NOTIFY_OCD);
2714                 break;
2715         }
2716         case IMP_EVENT_DEACTIVATE:
2717         case IMP_EVENT_ACTIVATE:
2718                 break;
2719         default:
2720                 CERROR("Unknown import event %x\n", event);
2721                 LBUG();
2722         }
2723         RETURN(rc);
2724 }
2725
2726 int mdc_fid_alloc(const struct lu_env *env, struct obd_export *exp,
2727                   struct lu_fid *fid, struct md_op_data *op_data)
2728 {
2729         struct client_obd *cli = &exp->exp_obd->u.cli;
2730         int rc = -EIO;
2731
2732         ENTRY;
2733
2734         down_read(&cli->cl_seq_rwsem);
2735         if (cli->cl_seq)
2736                 rc = seq_client_alloc_fid(env, cli->cl_seq, fid);
2737         up_read(&cli->cl_seq_rwsem);
2738
2739         RETURN(rc);
2740 }
2741
2742 static struct obd_uuid *mdc_get_uuid(struct obd_export *exp)
2743 {
2744         struct client_obd *cli = &exp->exp_obd->u.cli;
2745         return &cli->cl_target_uuid;
2746 }
2747
2748 /**
2749  * Determine whether the lock can be canceled before replaying it during
2750  * recovery, non zero value will be return if the lock can be canceled,
2751  * or zero returned for not
2752  */
2753 static int mdc_cancel_weight(struct ldlm_lock *lock)
2754 {
2755         if (lock->l_resource->lr_type != LDLM_IBITS)
2756                 RETURN(0);
2757
2758         /* FIXME: if we ever get into a situation where there are too many
2759          * opened files with open locks on a single node, then we really
2760          * should replay these open locks to reget it */
2761         if (lock->l_policy_data.l_inodebits.bits & MDS_INODELOCK_OPEN)
2762                 RETURN(0);
2763
2764         /* Special case for DoM locks, cancel only unused and granted locks */
2765         if (ldlm_has_dom(lock) &&
2766             (lock->l_granted_mode != lock->l_req_mode ||
2767              osc_ldlm_weigh_ast(lock) != 0))
2768                 RETURN(0);
2769
2770         RETURN(1);
2771 }
2772
2773 static int mdc_resource_inode_free(struct ldlm_resource *res)
2774 {
2775         if (res->lr_lvb_inode)
2776                 res->lr_lvb_inode = NULL;
2777
2778         return 0;
2779 }
2780
2781 static struct ldlm_valblock_ops inode_lvbo = {
2782         .lvbo_free = mdc_resource_inode_free
2783 };
2784
2785 static int mdc_llog_init(struct obd_device *obd)
2786 {
2787         struct obd_llog_group   *olg = &obd->obd_olg;
2788         struct llog_ctxt        *ctxt;
2789         int                      rc;
2790
2791         ENTRY;
2792
2793         rc = llog_setup(NULL, obd, olg, LLOG_CHANGELOG_REPL_CTXT, obd,
2794                         &llog_client_ops);
2795         if (rc < 0)
2796                 RETURN(rc);
2797
2798         ctxt = llog_group_get_ctxt(olg, LLOG_CHANGELOG_REPL_CTXT);
2799         llog_initiator_connect(ctxt);
2800         llog_ctxt_put(ctxt);
2801
2802         RETURN(0);
2803 }
2804
2805 static void mdc_llog_finish(struct obd_device *obd)
2806 {
2807         struct llog_ctxt *ctxt;
2808
2809         ENTRY;
2810
2811         ctxt = llog_get_context(obd, LLOG_CHANGELOG_REPL_CTXT);
2812         if (ctxt != NULL)
2813                 llog_cleanup(NULL, ctxt);
2814
2815         EXIT;
2816 }
2817
2818 int mdc_setup(struct obd_device *obd, struct lustre_cfg *cfg)
2819 {
2820         int rc;
2821
2822         ENTRY;
2823
2824         rc = osc_setup_common(obd, cfg);
2825         if (rc < 0)
2826                 RETURN(rc);
2827
2828         rc = mdc_tunables_init(obd);
2829         if (rc)
2830                 GOTO(err_osc_cleanup, rc);
2831
2832         obd->u.cli.cl_dom_min_inline_repsize = MDC_DOM_DEF_INLINE_REPSIZE;
2833
2834         ns_register_cancel(obd->obd_namespace, mdc_cancel_weight);
2835
2836         obd->obd_namespace->ns_lvbo = &inode_lvbo;
2837
2838         rc = mdc_llog_init(obd);
2839         if (rc) {
2840                 CERROR("%s: failed to setup llogging subsystems: rc = %d\n",
2841                        obd->obd_name, rc);
2842                 GOTO(err_llog_cleanup, rc);
2843         }
2844
2845         rc = mdc_changelog_cdev_init(obd);
2846         if (rc) {
2847                 CERROR("%s: failed to setup changelog char device: rc = %d\n",
2848                        obd->obd_name, rc);
2849                 GOTO(err_changelog_cleanup, rc);
2850         }
2851
2852         RETURN(rc);
2853
2854 err_changelog_cleanup:
2855         mdc_llog_finish(obd);
2856 err_llog_cleanup:
2857         lprocfs_free_md_stats(obd);
2858         ptlrpc_lprocfs_unregister_obd(obd);
2859 err_osc_cleanup:
2860         osc_cleanup_common(obd);
2861         return rc;
2862 }
2863
2864 /* Initialize the default and maximum LOV EA sizes.  This allows
2865  * us to make MDS RPCs with large enough reply buffers to hold a default
2866  * sized EA without having to calculate this (via a call into the
2867  * LOV + OSCs) each time we make an RPC.  The maximum size is also tracked
2868  * but not used to avoid wastefully vmalloc()'ing large reply buffers when
2869  * a large number of stripes is possible.  If a larger reply buffer is
2870  * required it will be reallocated in the ptlrpc layer due to overflow.
2871  */
2872 static int mdc_init_ea_size(struct obd_export *exp, __u32 easize,
2873                             __u32 def_easize)
2874 {
2875         struct obd_device *obd = exp->exp_obd;
2876         struct client_obd *cli = &obd->u.cli;
2877         ENTRY;
2878
2879         if (cli->cl_max_mds_easize < easize)
2880                 cli->cl_max_mds_easize = easize;
2881
2882         if (cli->cl_default_mds_easize < def_easize)
2883                 cli->cl_default_mds_easize = def_easize;
2884
2885         RETURN(0);
2886 }
2887
2888 static int mdc_precleanup(struct obd_device *obd)
2889 {
2890         ENTRY;
2891
2892         osc_precleanup_common(obd);
2893         mdc_changelog_cdev_finish(obd);
2894
2895         obd_cleanup_client_import(obd);
2896         ptlrpc_lprocfs_unregister_obd(obd);
2897         lprocfs_free_md_stats(obd);
2898         mdc_llog_finish(obd);
2899         RETURN(0);
2900 }
2901
2902 static int mdc_cleanup(struct obd_device *obd)
2903 {
2904         return osc_cleanup_common(obd);
2905 }
2906
2907 static const struct obd_ops mdc_obd_ops = {
2908         .o_owner            = THIS_MODULE,
2909         .o_setup            = mdc_setup,
2910         .o_precleanup       = mdc_precleanup,
2911         .o_cleanup          = mdc_cleanup,
2912         .o_add_conn         = client_import_add_conn,
2913         .o_del_conn         = client_import_del_conn,
2914         .o_connect          = client_connect_import,
2915         .o_reconnect        = osc_reconnect,
2916         .o_disconnect       = osc_disconnect,
2917         .o_iocontrol        = mdc_iocontrol,
2918         .o_set_info_async   = mdc_set_info_async,
2919         .o_statfs           = mdc_statfs,
2920         .o_statfs_async     = mdc_statfs_async,
2921         .o_fid_init         = client_fid_init,
2922         .o_fid_fini         = client_fid_fini,
2923         .o_fid_alloc        = mdc_fid_alloc,
2924         .o_import_event     = mdc_import_event,
2925         .o_get_info         = mdc_get_info,
2926         .o_get_uuid         = mdc_get_uuid,
2927         .o_quotactl         = mdc_quotactl,
2928 };
2929
2930 static const struct md_ops mdc_md_ops = {
2931         .m_get_root         = mdc_get_root,
2932         .m_null_inode       = mdc_null_inode,
2933         .m_close            = mdc_close,
2934         .m_create           = mdc_create,
2935         .m_enqueue          = mdc_enqueue,
2936         .m_getattr          = mdc_getattr,
2937         .m_getattr_name     = mdc_getattr_name,
2938         .m_intent_lock      = mdc_intent_lock,
2939         .m_link             = mdc_link,
2940         .m_rename           = mdc_rename,
2941         .m_setattr          = mdc_setattr,
2942         .m_setxattr         = mdc_setxattr,
2943         .m_getxattr         = mdc_getxattr,
2944         .m_fsync                = mdc_fsync,
2945         .m_file_resync          = mdc_file_resync,
2946         .m_read_page            = mdc_read_page,
2947         .m_unlink           = mdc_unlink,
2948         .m_cancel_unused    = mdc_cancel_unused,
2949         .m_init_ea_size     = mdc_init_ea_size,
2950         .m_set_lock_data    = mdc_set_lock_data,
2951         .m_lock_match       = mdc_lock_match,
2952         .m_get_lustre_md    = mdc_get_lustre_md,
2953         .m_free_lustre_md   = mdc_free_lustre_md,
2954         .m_set_open_replay_data = mdc_set_open_replay_data,
2955         .m_clear_open_replay_data = mdc_clear_open_replay_data,
2956         .m_intent_getattr_async = mdc_intent_getattr_async,
2957         .m_revalidate_lock      = mdc_revalidate_lock,
2958         .m_rmfid                = mdc_rmfid,
2959 };
2960
2961 dev_t mdc_changelog_dev;
2962 struct class *mdc_changelog_class;
2963 static int __init mdc_init(void)
2964 {
2965         int rc = 0;
2966         rc = alloc_chrdev_region(&mdc_changelog_dev, 0,
2967                                  MDC_CHANGELOG_DEV_COUNT,
2968                                  MDC_CHANGELOG_DEV_NAME);
2969         if (rc)
2970                 return rc;
2971
2972         mdc_changelog_class = class_create(THIS_MODULE, MDC_CHANGELOG_DEV_NAME);
2973         if (IS_ERR(mdc_changelog_class)) {
2974                 rc = PTR_ERR(mdc_changelog_class);
2975                 goto out_dev;
2976         }
2977
2978         rc = class_register_type(&mdc_obd_ops, &mdc_md_ops, true, NULL,
2979                                  LUSTRE_MDC_NAME, &mdc_device_type);
2980         if (rc)
2981                 goto out_dev;
2982
2983         return 0;
2984
2985 out_dev:
2986         unregister_chrdev_region(mdc_changelog_dev, MDC_CHANGELOG_DEV_COUNT);
2987         return rc;
2988 }
2989
2990 static void __exit mdc_exit(void)
2991 {
2992         class_destroy(mdc_changelog_class);
2993         unregister_chrdev_region(mdc_changelog_dev, MDC_CHANGELOG_DEV_COUNT);
2994         class_unregister_type(LUSTRE_MDC_NAME);
2995 }
2996
2997 MODULE_AUTHOR("OpenSFS, Inc. <http://www.lustre.org/>");
2998 MODULE_DESCRIPTION("Lustre Metadata Client");
2999 MODULE_VERSION(LUSTRE_VERSION_STRING);
3000 MODULE_LICENSE("GPL");
3001
3002 module_init(mdc_init);
3003 module_exit(mdc_exit);