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  */
  31
  32 #define DEBUG_SUBSYSTEM S_MDC
  33
  34 #include <linux/init.h>
  35 #include <linux/kthread.h>
  36 #include <linux/module.h>
  37 #include <linux/pagemap.h>
  38 #include <linux/user_namespace.h>
  39 #include <linux/utsname.h>
  40 #include <linux/delay.h>
  41 #include <linux/uidgid.h>
  42 #include <linux/device.h>
  43 #include <linux/xarray.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_compat.h>
  52 #include <lustre_fid.h>
  53 #include <uapi/linux/lustre/lustre_ioctl.h>
  54 #include <lustre_kernelcomm.h>
  55 #include <lustre_lmv.h>
  56 #include <lustre_log.h>
  57 #include <lustre_swab.h>
  58 #include <obd_class.h>
  59 #include <lustre_osc.h>
  60
  61 #include "mdc_internal.h"
  62
  63 #define REQUEST_MINOR 244
  64
  65 static int mdc_cleanup(struct obd_device *obd);
  66
  67 static inline int mdc_queue_wait(struct ptlrpc_request *req)
  68 {
  69         struct client_obd *cli = &req->rq_import->imp_obd->u.cli;
  70         int rc;
  71
  72         /* obd_get_request_slot() ensures that this client has no more
  73          * than cl_max_rpcs_in_flight RPCs simultaneously inf light
  74          * against an MDT. */
  75         rc = obd_get_request_slot(cli);
  76         if (rc != 0)
  77                 return rc;
  78
  79         rc = ptlrpc_queue_wait(req);
  80         obd_put_request_slot(cli);
  81
  82         return rc;
  83 }
  84
  85 /*
  86  * Send MDS_GET_ROOT RPC to fetch root FID.
  87  *
  88  * If \a fileset is not NULL it should contain a subdirectory off
  89  * the ROOT/ directory to be mounted on the client. Return the FID
  90  * of the subdirectory to the client to mount onto its mountpoint.
  91  *
  92  * \param[in]   imp     MDC import
  93  * \param[in]   fileset fileset name, which could be NULL
  94  * \param[out]  rootfid root FID of this mountpoint
  95  * \param[out]  pc      root capa will be unpacked and saved in this pointer
  96  *
  97  * \retval      0 on success, negative errno on failure
  98  */
  99 static int mdc_get_root(struct obd_export *exp, const char *fileset,
 100                          struct lu_fid *rootfid)
 101 {
 102         struct ptlrpc_request   *req;
 103         struct mdt_body         *body;
 104         int                      rc;
 105
 106         ENTRY;
 107
 108         if (fileset && !(exp_connect_flags(exp) & OBD_CONNECT_SUBTREE))
 109                 RETURN(-ENOTSUPP);
 110
 111         req = ptlrpc_request_alloc(class_exp2cliimp(exp),
 112                                 &RQF_MDS_GET_ROOT);
 113         if (req == NULL)
 114                 RETURN(-ENOMEM);
 115
 116         if (fileset != NULL)
 117                 req_capsule_set_size(&req->rq_pill, &RMF_NAME, RCL_CLIENT,
 118                                      strlen(fileset) + 1);
 119         rc = ptlrpc_request_pack(req, LUSTRE_MDS_VERSION, MDS_GET_ROOT);
 120         if (rc) {
 121                 ptlrpc_request_free(req);
 122                 RETURN(rc);
 123         }
 124         mdc_pack_body(&req->rq_pill, NULL, 0, 0, -1, 0);
 125         if (fileset != NULL) {
 126                 char *name = req_capsule_client_get(&req->rq_pill, &RMF_NAME);
 127
 128                 memcpy(name, fileset, strlen(fileset));
 129         }
 130         lustre_msg_add_flags(req->rq_reqmsg, LUSTRE_IMP_FULL);
 131         req->rq_send_state = LUSTRE_IMP_FULL;
 132
 133         ptlrpc_request_set_replen(req);
 134
 135         rc = ptlrpc_queue_wait(req);
 136         if (rc)
 137                 GOTO(out, rc);
 138
 139         body = req_capsule_server_get(&req->rq_pill, &RMF_MDT_BODY);
 140         if (body == NULL)
 141                 GOTO(out, rc = -EPROTO);
 142
 143         *rootfid = body->mbo_fid1;
 144         CDEBUG(D_NET, "root fid="DFID", last_committed=%llu\n",
 145                PFID(rootfid), lustre_msg_get_last_committed(req->rq_repmsg));
 146         EXIT;
 147 out:
 148         ptlrpc_req_finished(req);
 149
 150         return rc;
 151 }
 152
 153 /*
 154  * This function now is known to always saying that it will receive 4 buffers
 155  * from server. Even for cases when acl_size and md_size is zero, RPC header
 156  * will contain 4 fields and RPC itself will contain zero size fields. This is
 157  * because mdt_getattr*() _always_ returns 4 fields, but if acl is not needed
 158  * and thus zero, it shrinks it, making zero size. The same story about
 159  * md_size. And this is course of problem when client waits for smaller number
 160  * of fields. This issue will be fixed later when client gets aware of RPC
 161  * layouts.  --umka
 162  */
 163 static int mdc_getattr_common(struct obd_export *exp,
 164                               struct ptlrpc_request *req)
 165 {
 166         struct req_capsule *pill = &req->rq_pill;
 167         struct mdt_body    *body;
 168         void               *eadata;
 169         int                 rc;
 170         ENTRY;
 171
 172         /* Request message already built. */
 173         rc = ptlrpc_queue_wait(req);
 174         if (rc != 0)
 175                 RETURN(rc);
 176
 177         /* sanity check for the reply */
 178         body = req_capsule_server_get(pill, &RMF_MDT_BODY);
 179         if (body == NULL)
 180                 RETURN(-EPROTO);
 181
 182         CDEBUG(D_NET, "mode: %o\n", body->mbo_mode);
 183
 184         mdc_update_max_ea_from_body(exp, body);
 185         if (body->mbo_eadatasize != 0) {
 186                 eadata = req_capsule_server_sized_get(pill, &RMF_MDT_MD,
 187                                                       body->mbo_eadatasize);
 188                 if (eadata == NULL)
 189                         RETURN(-EPROTO);
 190         }
 191
 192         RETURN(0);
 193 }
 194
 195 static void mdc_reset_acl_req(struct ptlrpc_request *req)
 196 {
 197         spin_lock(&req->rq_early_free_lock);
 198         sptlrpc_cli_free_repbuf(req);
 199         req->rq_repbuf = NULL;
 200         req->rq_repbuf_len = 0;
 201         req->rq_repdata = NULL;
 202         req->rq_reqdata_len = 0;
 203         spin_unlock(&req->rq_early_free_lock);
 204 }
 205
 206 static int mdc_getattr(struct obd_export *exp, struct md_op_data *op_data,
 207                        struct ptlrpc_request **request)
 208 {
 209         struct ptlrpc_request *req;
 210         struct obd_import *imp = class_exp2cliimp(exp);
 211         __u32 acl_bufsize = LUSTRE_POSIX_ACL_MAX_SIZE_OLD;
 212         int rc;
 213         ENTRY;
 214
 215         /* Single MDS without an LMV case */
 216         if (op_data->op_flags & MF_GET_MDT_IDX) {
 217                 op_data->op_mds = 0;
 218                 RETURN(0);
 219         }
 220
 221         *request = NULL;
 222         req = ptlrpc_request_alloc(imp, &RQF_MDS_GETATTR);
 223         if (req == NULL)
 224                 RETURN(-ENOMEM);
 225
 226         rc = ptlrpc_request_pack(req, LUSTRE_MDS_VERSION, MDS_GETATTR);
 227         if (rc) {
 228                 ptlrpc_request_free(req);
 229                 RETURN(rc);
 230         }
 231
 232 again:
 233         mdc_pack_body(&req->rq_pill, &op_data->op_fid1, op_data->op_valid,
 234                       op_data->op_mode, -1, 0);
 235         req_capsule_set_size(&req->rq_pill, &RMF_ACL, RCL_SERVER, acl_bufsize);
 236         req_capsule_set_size(&req->rq_pill, &RMF_MDT_MD, RCL_SERVER,
 237                              op_data->op_mode);
 238         ptlrpc_request_set_replen(req);
 239
 240         rc = mdc_getattr_common(exp, req);
 241         if (rc) {
 242                 if (rc == -ERANGE) {
 243                         acl_bufsize = min_t(__u32,
 244                                             imp->imp_connect_data.ocd_max_easize,
 245                                             XATTR_SIZE_MAX);
 246                         mdc_reset_acl_req(req);
 247                         goto again;
 248                 }
 249
 250                 ptlrpc_req_finished(req);
 251         } else {
 252                 *request = req;
 253         }
 254
 255         RETURN(rc);
 256 }
 257
 258 static int mdc_getattr_name(struct obd_export *exp, struct md_op_data *op_data,
 259                             struct ptlrpc_request **request)
 260 {
 261         struct ptlrpc_request *req;
 262         struct obd_import *imp = class_exp2cliimp(exp);
 263         __u32 acl_bufsize = LUSTRE_POSIX_ACL_MAX_SIZE_OLD;
 264         int rc;
 265         ENTRY;
 266
 267         *request = NULL;
 268         req = ptlrpc_request_alloc(imp, &RQF_MDS_GETATTR_NAME);
 269         if (req == NULL)
 270                 RETURN(-ENOMEM);
 271
 272         req_capsule_set_size(&req->rq_pill, &RMF_NAME, RCL_CLIENT,
 273                              op_data->op_namelen + 1);
 274
 275         rc = ptlrpc_request_pack(req, LUSTRE_MDS_VERSION, MDS_GETATTR_NAME);
 276         if (rc) {
 277                 ptlrpc_request_free(req);
 278                 RETURN(rc);
 279         }
 280
 281         if (op_data->op_name) {
 282                 char *name = req_capsule_client_get(&req->rq_pill, &RMF_NAME);
 283                 LASSERT(strnlen(op_data->op_name, op_data->op_namelen) ==
 284                                 op_data->op_namelen);
 285                 memcpy(name, op_data->op_name, op_data->op_namelen);
 286         }
 287
 288 again:
 289         mdc_pack_body(&req->rq_pill, &op_data->op_fid1, op_data->op_valid,
 290                       op_data->op_mode, op_data->op_suppgids[0], 0);
 291         req_capsule_set_size(&req->rq_pill, &RMF_MDT_MD, RCL_SERVER,
 292                              op_data->op_mode);
 293         req_capsule_set_size(&req->rq_pill, &RMF_ACL, RCL_SERVER, acl_bufsize);
 294         ptlrpc_request_set_replen(req);
 295
 296         rc = mdc_getattr_common(exp, req);
 297         if (rc) {
 298                 if (rc == -ERANGE) {
 299                         acl_bufsize = min_t(__u32,
 300                                             imp->imp_connect_data.ocd_max_easize,
 301                                             XATTR_SIZE_MAX);
 302                         mdc_reset_acl_req(req);
 303                         goto again;
 304                 }
 305
 306                 ptlrpc_req_finished(req);
 307         } else {
 308                 *request = req;
 309         }
 310
 311         RETURN(rc);
 312 }
 313
 314 static int mdc_xattr_common(struct obd_export *exp,const struct req_format *fmt,
 315                             const struct lu_fid *fid, int opcode, u64 valid,
 316                             const char *xattr_name, const char *input,
 317                             int input_size, int output_size, int flags,
 318                             __u32 suppgid, struct ptlrpc_request **request)
 319 {
 320         struct ptlrpc_request *req;
 321         int   xattr_namelen = 0;
 322         char *tmp;
 323         int   rc;
 324         ENTRY;
 325
 326         *request = NULL;
 327         req = ptlrpc_request_alloc(class_exp2cliimp(exp), fmt);
 328         if (req == NULL)
 329                 RETURN(-ENOMEM);
 330
 331         if (xattr_name) {
 332                 xattr_namelen = strlen(xattr_name) + 1;
 333                 req_capsule_set_size(&req->rq_pill, &RMF_NAME, RCL_CLIENT,
 334                                      xattr_namelen);
 335         }
 336         if (input_size)
 337                 LASSERT(input);
 338         req_capsule_set_size(&req->rq_pill, &RMF_EADATA, RCL_CLIENT,
 339                              input_size);
 340
 341         /* get SELinux policy info if any */
 342         rc = sptlrpc_get_sepol(req);
 343         if (rc < 0) {
 344                 ptlrpc_request_free(req);
 345                 RETURN(rc);
 346         }
 347         req_capsule_set_size(&req->rq_pill, &RMF_SELINUX_POL, RCL_CLIENT,
 348                              strlen(req->rq_sepol) ?
 349                              strlen(req->rq_sepol) + 1 : 0);
 350
 351         /* Flush local XATTR locks to get rid of a possible cancel RPC */
 352         if (opcode == MDS_REINT && fid_is_sane(fid) &&
 353             exp->exp_connect_data.ocd_ibits_known & MDS_INODELOCK_XATTR) {
 354                 LIST_HEAD(cancels);
 355                 int count;
 356
 357                 /* Without that packing would fail */
 358                 if (input_size == 0)
 359                         req_capsule_set_size(&req->rq_pill, &RMF_EADATA,
 360                                              RCL_CLIENT, 0);
 361
 362                 count = mdc_resource_get_unused(exp, fid,
 363                                                 &cancels, LCK_EX,
 364                                                 MDS_INODELOCK_XATTR);
 365
 366                 rc = mdc_prep_elc_req(exp, req, MDS_REINT, &cancels, count);
 367                 if (rc) {
 368                         ptlrpc_request_free(req);
 369                         RETURN(rc);
 370                 }
 371         } else {
 372                 rc = ptlrpc_request_pack(req, LUSTRE_MDS_VERSION, opcode);
 373                 if (rc) {
 374                         ptlrpc_request_free(req);
 375                         RETURN(rc);
 376                 }
 377         }
 378
 379         if (opcode == MDS_REINT) {
 380                 struct mdt_rec_setxattr *rec;
 381
 382                 BUILD_BUG_ON(sizeof(struct mdt_rec_setxattr) !=
 383                              sizeof(struct mdt_rec_reint));
 384                 rec = req_capsule_client_get(&req->rq_pill, &RMF_REC_REINT);
 385                 rec->sx_opcode = REINT_SETXATTR;
 386                 rec->sx_fsuid  = from_kuid(&init_user_ns, current_fsuid());
 387                 rec->sx_fsgid  = from_kgid(&init_user_ns, current_fsgid());
 388                 rec->sx_cap = current_cap().cap[0];
 389                 rec->sx_suppgid1 = suppgid;
 390                 rec->sx_suppgid2 = -1;
 391                 rec->sx_fid    = *fid;
 392                 rec->sx_valid  = valid | OBD_MD_FLCTIME;
 393                 rec->sx_time   = ktime_get_real_seconds();
 394                 rec->sx_size   = output_size;
 395                 rec->sx_flags  = flags;
 396         } else {
 397                 mdc_pack_body(&req->rq_pill, fid, valid, output_size,
 398                               suppgid, flags);
 399         }
 400
 401         if (xattr_name) {
 402                 tmp = req_capsule_client_get(&req->rq_pill, &RMF_NAME);
 403                 memcpy(tmp, xattr_name, xattr_namelen);
 404         }
 405         if (input_size) {
 406                 tmp = req_capsule_client_get(&req->rq_pill, &RMF_EADATA);
 407                 memcpy(tmp, input, input_size);
 408         }
 409
 410         mdc_file_sepol_pack(&req->rq_pill);
 411
 412         if (req_capsule_has_field(&req->rq_pill, &RMF_EADATA, RCL_SERVER))
 413                 req_capsule_set_size(&req->rq_pill, &RMF_EADATA,
 414                                      RCL_SERVER, output_size);
 415         ptlrpc_request_set_replen(req);
 416
 417         /* make rpc */
 418         if (opcode == MDS_REINT)
 419                 ptlrpc_get_mod_rpc_slot(req);
 420
 421         rc = ptlrpc_queue_wait(req);
 422
 423         if (opcode == MDS_REINT)
 424                 ptlrpc_put_mod_rpc_slot(req);
 425
 426         if (rc)
 427                 ptlrpc_req_finished(req);
 428         else
 429                 *request = req;
 430         RETURN(rc);
 431 }
 432
 433 static int mdc_setxattr(struct obd_export *exp, const struct lu_fid *fid,
 434                         u64 obd_md_valid, const char *name,
 435                         const void *value, size_t value_size,
 436                         unsigned int xattr_flags, u32 suppgid,
 437                         struct ptlrpc_request **req)
 438 {
 439         LASSERT(obd_md_valid == OBD_MD_FLXATTR ||
 440                 obd_md_valid == OBD_MD_FLXATTRRM);
 441
 442         return mdc_xattr_common(exp, &RQF_MDS_REINT_SETXATTR,
 443                                 fid, MDS_REINT, obd_md_valid, name,
 444                                 value, value_size, 0, xattr_flags, suppgid,
 445                                 req);
 446 }
 447
 448 static int mdc_getxattr(struct obd_export *exp, const struct lu_fid *fid,
 449                         u64 obd_md_valid, const char *name, size_t buf_size,
 450                         struct ptlrpc_request **req)
 451 {
 452         struct mdt_body *body;
 453         int rc;
 454
 455         LASSERT(obd_md_valid == OBD_MD_FLXATTR ||
 456                 obd_md_valid == OBD_MD_FLXATTRLS);
 457
 458         /* Message below is checked in sanity-selinux test_20d
 459          * and sanity-sec test_49
 460          */
 461         CDEBUG(D_INFO, "%s: get xattr '%s' for "DFID"\n",
 462                exp->exp_obd->obd_name, name, PFID(fid));
 463         rc = mdc_xattr_common(exp, &RQF_MDS_GETXATTR, fid, MDS_GETXATTR,
 464                               obd_md_valid, name, NULL, 0, buf_size, 0, -1,
 465                               req);
 466         if (rc < 0)
 467                 GOTO(out, rc);
 468
 469         body = req_capsule_server_get(&(*req)->rq_pill, &RMF_MDT_BODY);
 470         if (body == NULL)
 471                 GOTO(out, rc = -EPROTO);
 472
 473         /* only detect the xattr size */
 474         if (buf_size == 0) {
 475                 /* LU-11109: Older MDTs do not distinguish
 476                  * between nonexistent xattrs and zero length
 477                  * values in this case. Newer MDTs will return
 478                  * -ENODATA or set OBD_MD_FLXATTR. */
 479                 GOTO(out, rc = body->mbo_eadatasize);
 480         }
 481
 482         if (body->mbo_eadatasize == 0) {
 483                 /* LU-11109: Newer MDTs set OBD_MD_FLXATTR on
 484                  * success so that we can distinguish between
 485                  * zero length value and nonexistent xattr.
 486                  *
 487                  * If OBD_MD_FLXATTR is not set then we keep
 488                  * the old behavior and return -ENODATA for
 489                  * getxattr() when mbo_eadatasize is 0. But
 490                  * -ENODATA only makes sense for getxattr()
 491                  * and not for listxattr(). */
 492                 if (body->mbo_valid & OBD_MD_FLXATTR)
 493                         GOTO(out, rc = 0);
 494                 else if (obd_md_valid == OBD_MD_FLXATTR)
 495                         GOTO(out, rc = -ENODATA);
 496                 else
 497                         GOTO(out, rc = 0);
 498         }
 499
 500         GOTO(out, rc = body->mbo_eadatasize);
 501 out:
 502         if (rc < 0) {
 503                 ptlrpc_req_finished(*req);
 504                 *req = NULL;
 505         }
 506
 507         return rc;
 508 }
 509
 510 static int mdc_get_lustre_md(struct obd_export *exp, struct req_capsule *pill,
 511                              struct obd_export *dt_exp,
 512                              struct obd_export *md_exp,
 513                              struct lustre_md *md)
 514 {
 515         int rc;
 516         ENTRY;
 517
 518         LASSERT(md);
 519         memset(md, 0, sizeof(*md));
 520
 521         md->body = req_capsule_server_get(pill, &RMF_MDT_BODY);
 522         LASSERT(md->body != NULL);
 523
 524         if (md->body->mbo_valid & OBD_MD_FLEASIZE) {
 525                 if (!S_ISREG(md->body->mbo_mode)) {
 526                         CDEBUG(D_INFO, "OBD_MD_FLEASIZE set, should be a "
 527                                "regular file, but is not\n");
 528                         GOTO(out, rc = -EPROTO);
 529                 }
 530
 531                 if (md->body->mbo_eadatasize == 0) {
 532                         CDEBUG(D_INFO, "OBD_MD_FLEASIZE set, "
 533                                "but eadatasize 0\n");
 534                         GOTO(out, rc = -EPROTO);
 535                 }
 536
 537                 md->layout.lb_len = md->body->mbo_eadatasize;
 538                 md->layout.lb_buf = req_capsule_server_sized_get(pill,
 539                                                         &RMF_MDT_MD,
 540                                                         md->layout.lb_len);
 541                 if (md->layout.lb_buf == NULL)
 542                         GOTO(out, rc = -EPROTO);
 543         } else if (md->body->mbo_valid & OBD_MD_FLDIREA) {
 544                 const union lmv_mds_md *lmv;
 545                 size_t lmv_size;
 546
 547                 if (!S_ISDIR(md->body->mbo_mode)) {
 548                         CDEBUG(D_INFO, "OBD_MD_FLDIREA set, should be a "
 549                                "directory, but is not\n");
 550                         GOTO(out, rc = -EPROTO);
 551                 }
 552
 553                 if (md_exp->exp_obd->obd_type->typ_lu == &mdc_device_type) {
 554                         CERROR("%s: no LMV, upgrading from old version?\n",
 555                                md_exp->exp_obd->obd_name);
 556
 557                         GOTO(out_acl, rc = 0);
 558                 }
 559
 560                 if (md->body->mbo_valid & OBD_MD_MEA) {
 561                         lmv_size = md->body->mbo_eadatasize;
 562                         if (lmv_size == 0) {
 563                                 CDEBUG(D_INFO, "OBD_MD_FLDIREA is set, "
 564                                        "but eadatasize 0\n");
 565                                 RETURN(-EPROTO);
 566                         }
 567
 568                         lmv = req_capsule_server_sized_get(pill, &RMF_MDT_MD,
 569                                                            lmv_size);
 570                         if (lmv == NULL)
 571                                 GOTO(out, rc = -EPROTO);
 572
 573                         rc = md_unpackmd(md_exp, &md->lmv, lmv, lmv_size);
 574                         if (rc < 0)
 575                                 GOTO(out, rc);
 576
 577                         if (rc < (int)sizeof(*md->lmv)) {
 578                                 struct lmv_foreign_md *lfm = md->lfm;
 579
 580                                 /* short (< sizeof(struct lmv_stripe_md))
 581                                  * foreign LMV case
 582                                  */
 583                                 if (lfm->lfm_magic != LMV_MAGIC_FOREIGN) {
 584                                         CDEBUG(D_INFO,
 585                                                "lmv size too small: %d < %d\n",
 586                                                rc, (int)sizeof(*md->lmv));
 587                                         GOTO(out, rc = -EPROTO);
 588                                 }
 589                         }
 590                 }
 591
 592                 /* since 2.12.58 intent_getattr fetches default LMV */
 593                 if (md->body->mbo_valid & OBD_MD_DEFAULT_MEA) {
 594                         lmv_size = sizeof(struct lmv_user_md);
 595                         lmv = req_capsule_server_sized_get(pill,
 596                                                            &RMF_DEFAULT_MDT_MD,
 597                                                            lmv_size);
 598                         if (!lmv)
 599                                 GOTO(out, rc = -EPROTO);
 600
 601                         rc = md_unpackmd(md_exp, &md->default_lmv, lmv,
 602                                          lmv_size);
 603                         if (rc < 0)
 604                                 GOTO(out, rc);
 605
 606                         if (rc < (int)sizeof(*md->default_lmv)) {
 607                                 CDEBUG(D_INFO,
 608                                        "default lmv size too small: %d < %d\n",
 609                                         rc, (int)sizeof(*md->default_lmv));
 610                                 GOTO(out, rc = -EPROTO);
 611                         }
 612                 }
 613         }
 614         rc = 0;
 615
 616 out_acl:
 617         if (md->body->mbo_valid & OBD_MD_FLACL) {
 618                 /* for ACL, it's possible that FLACL is set but aclsize is zero.
 619                  * only when aclsize != 0 there's an actual segment for ACL
 620                  * in reply buffer.
 621                  */
 622                 rc = mdc_unpack_acl(pill, md);
 623                 if (rc)
 624                         GOTO(out, rc);
 625         }
 626
 627         EXIT;
 628 out:
 629         if (rc)
 630                 lmd_clear_acl(md);
 631
 632         return rc;
 633 }
 634
 635 static int mdc_free_lustre_md(struct obd_export *exp, struct lustre_md *md)
 636 {
 637         ENTRY;
 638         RETURN(0);
 639 }
 640
 641 void mdc_replay_open(struct ptlrpc_request *req)
 642 {
 643         struct md_open_data *mod = req->rq_cb_data;
 644         struct ptlrpc_request *close_req;
 645         struct obd_client_handle *och;
 646         struct lustre_handle old_open_handle = { };
 647         struct mdt_body *body;
 648         struct ldlm_reply *rep;
 649         ENTRY;
 650
 651         if (mod == NULL) {
 652                 DEBUG_REQ(D_ERROR, req,
 653                           "cannot properly replay without open data");
 654                 EXIT;
 655                 return;
 656         }
 657
 658         body = req_capsule_server_get(&req->rq_pill, &RMF_MDT_BODY);
 659         LASSERT(body != NULL);
 660
 661         rep = req_capsule_server_get(&req->rq_pill, &RMF_DLM_REP);
 662         if (rep != NULL && rep->lock_policy_res2 != 0)
 663                 DEBUG_REQ(D_ERROR, req, "Open request replay failed with %ld ",
 664                         (long int)rep->lock_policy_res2);
 665
 666         spin_lock(&req->rq_lock);
 667         och = mod->mod_och;
 668         if (och && och->och_open_handle.cookie)
 669                 req->rq_early_free_repbuf = 1;
 670         else
 671                 req->rq_early_free_repbuf = 0;
 672         spin_unlock(&req->rq_lock);
 673
 674         if (req->rq_early_free_repbuf) {
 675                 struct lustre_handle *file_open_handle;
 676
 677                 LASSERT(och->och_magic == OBD_CLIENT_HANDLE_MAGIC);
 678
 679                 file_open_handle = &och->och_open_handle;
 680                 CDEBUG(D_HA, "updating handle from %#llx to %#llx\n",
 681                        file_open_handle->cookie, body->mbo_open_handle.cookie);
 682                 old_open_handle = *file_open_handle;
 683                 *file_open_handle = body->mbo_open_handle;
 684         }
 685
 686         close_req = mod->mod_close_req;
 687         if (close_req) {
 688                 __u32 opc = lustre_msg_get_opc(close_req->rq_reqmsg);
 689                 struct mdt_ioepoch *epoch;
 690
 691                 LASSERT(opc == MDS_CLOSE);
 692                 epoch = req_capsule_client_get(&close_req->rq_pill,
 693                                                &RMF_MDT_EPOCH);
 694                 LASSERT(epoch);
 695
 696                 if (req->rq_early_free_repbuf)
 697                         LASSERT(old_open_handle.cookie ==
 698                                 epoch->mio_open_handle.cookie);
 699
 700                 DEBUG_REQ(D_HA, close_req, "updating close body with new fh");
 701                 epoch->mio_open_handle = body->mbo_open_handle;
 702         }
 703         EXIT;
 704 }
 705
 706 void mdc_commit_open(struct ptlrpc_request *req)
 707 {
 708         struct md_open_data *mod = req->rq_cb_data;
 709         if (mod == NULL)
 710                 return;
 711
 712         /**
 713          * No need to touch md_open_data::mod_och, it holds a reference on
 714          * \var mod and will zero references to each other, \var mod will be
 715          * freed after that when md_open_data::mod_och will put the reference.
 716          */
 717
 718         /**
 719          * Do not let open request to disappear as it still may be needed
 720          * for close rpc to happen (it may happen on evict only, otherwise
 721          * ptlrpc_request::rq_replay does not let mdc_commit_open() to be
 722          * called), just mark this rpc as committed to distinguish these 2
 723          * cases, see mdc_close() for details. The open request reference will
 724          * be put along with freeing \var mod.
 725          */
 726         ptlrpc_request_addref(req);
 727         spin_lock(&req->rq_lock);
 728         req->rq_committed = 1;
 729         spin_unlock(&req->rq_lock);
 730         req->rq_cb_data = NULL;
 731         obd_mod_put(mod);
 732 }
 733
 734 int mdc_set_open_replay_data(struct obd_export *exp,
 735                              struct obd_client_handle *och,
 736                              struct lookup_intent *it)
 737 {
 738         struct md_open_data     *mod;
 739         struct mdt_rec_create   *rec;
 740         struct mdt_body         *body;
 741         struct ptlrpc_request   *open_req = it->it_request;
 742         struct obd_import       *imp = open_req->rq_import;
 743         ENTRY;
 744
 745         if (!open_req->rq_replay)
 746                 RETURN(0);
 747
 748         rec = req_capsule_client_get(&open_req->rq_pill, &RMF_REC_REINT);
 749         body = req_capsule_server_get(&open_req->rq_pill, &RMF_MDT_BODY);
 750         LASSERT(rec != NULL);
 751         /* Incoming message in my byte order (it's been swabbed). */
 752         /* Outgoing messages always in my byte order. */
 753         LASSERT(body != NULL);
 754
 755         /* Only if the import is replayable, we set replay_open data */
 756         if (och && imp->imp_replayable) {
 757                 mod = obd_mod_alloc();
 758                 if (mod == NULL) {
 759                         DEBUG_REQ(D_ERROR, open_req,
 760                                   "cannot allocate md_open_data");
 761                         RETURN(0);
 762                 }
 763
 764                 /**
 765                  * Take a reference on \var mod, to be freed on mdc_close().
 766                  * It protects \var mod from being freed on eviction (commit
 767                  * callback is called despite rq_replay flag).
 768                  * Another reference for \var och.
 769                  */
 770                 obd_mod_get(mod);
 771                 obd_mod_get(mod);
 772
 773                 spin_lock(&open_req->rq_lock);
 774                 och->och_mod = mod;
 775                 mod->mod_och = och;
 776                 mod->mod_is_create = it_disposition(it, DISP_OPEN_CREATE) ||
 777                                      it_disposition(it, DISP_OPEN_STRIPE);
 778                 mod->mod_open_req = open_req;
 779                 open_req->rq_cb_data = mod;
 780                 open_req->rq_commit_cb = mdc_commit_open;
 781                 open_req->rq_early_free_repbuf = 1;
 782                 spin_unlock(&open_req->rq_lock);
 783         }
 784
 785         rec->cr_fid2 = body->mbo_fid1;
 786         rec->cr_open_handle_old = body->mbo_open_handle;
 787         open_req->rq_replay_cb = mdc_replay_open;
 788         if (!fid_is_sane(&body->mbo_fid1)) {
 789                 DEBUG_REQ(D_ERROR, open_req,
 790                           "saving replay request with insane FID " DFID,
 791                           PFID(&body->mbo_fid1));
 792                 LBUG();
 793         }
 794
 795         DEBUG_REQ(D_RPCTRACE, open_req, "Set up open replay data");
 796         RETURN(0);
 797 }
 798
 799 static void mdc_free_open(struct md_open_data *mod)
 800 {
 801         int committed = 0;
 802
 803         if (mod->mod_is_create == 0 &&
 804             imp_connect_disp_stripe(mod->mod_open_req->rq_import))
 805                 committed = 1;
 806
 807         /**
 808          * No reason to asssert here if the open request has
 809          * rq_replay == 1. It means that mdc_close failed, and
 810          * close request wasn`t sent. It is not fatal to client.
 811          * The worst thing is eviction if the client gets open lock
 812          **/
 813
 814         DEBUG_REQ(D_RPCTRACE, mod->mod_open_req,
 815                   "free open request, rq_replay=%d",
 816                   mod->mod_open_req->rq_replay);
 817
 818         ptlrpc_request_committed(mod->mod_open_req, committed);
 819         if (mod->mod_close_req)
 820                 ptlrpc_request_committed(mod->mod_close_req, committed);
 821 }
 822
 823 static int mdc_clear_open_replay_data(struct obd_export *exp,
 824                                       struct obd_client_handle *och)
 825 {
 826         struct md_open_data *mod = och->och_mod;
 827         ENTRY;
 828
 829         /**
 830          * It is possible to not have \var mod in a case of eviction between
 831          * lookup and ll_file_open().
 832          **/
 833         if (mod == NULL)
 834                 RETURN(0);
 835
 836         LASSERT(mod != LP_POISON);
 837         LASSERT(mod->mod_open_req != NULL);
 838
 839         spin_lock(&mod->mod_open_req->rq_lock);
 840         if (mod->mod_och)
 841                 mod->mod_och->och_open_handle.cookie = 0;
 842         mod->mod_open_req->rq_early_free_repbuf = 0;
 843         spin_unlock(&mod->mod_open_req->rq_lock);
 844         mdc_free_open(mod);
 845
 846         mod->mod_och = NULL;
 847         och->och_mod = NULL;
 848         obd_mod_put(mod);
 849
 850         RETURN(0);
 851 }
 852
 853 static int mdc_close(struct obd_export *exp, struct md_op_data *op_data,
 854                      struct md_open_data *mod, struct ptlrpc_request **request)
 855 {
 856         struct obd_device     *obd = class_exp2obd(exp);
 857         struct ptlrpc_request *req;
 858         struct req_format     *req_fmt;
 859         size_t                 u32_count = 0;
 860         int                    rc;
 861         int                    saved_rc = 0;
 862         ENTRY;
 863
 864         CDEBUG(D_INODE, "%s: "DFID" file closed with intent: %x\n",
 865                exp->exp_obd->obd_name, PFID(&op_data->op_fid1),
 866                op_data->op_bias);
 867
 868         if (op_data->op_bias & MDS_CLOSE_INTENT) {
 869                 req_fmt = &RQF_MDS_CLOSE_INTENT;
 870                 if (op_data->op_bias & MDS_HSM_RELEASE) {
 871                         /* allocate a FID for volatile file */
 872                         rc = mdc_fid_alloc(NULL, exp, &op_data->op_fid2,
 873                                            op_data);
 874                         if (rc < 0) {
 875                                 CERROR("%s: "DFID" allocating FID: rc = %d\n",
 876                                        obd->obd_name, PFID(&op_data->op_fid1),
 877                                        rc);
 878                                 /* save the errcode and proceed to close */
 879                                 saved_rc = rc;
 880                         }
 881                 }
 882                 if (op_data->op_bias & MDS_CLOSE_RESYNC_DONE) {
 883                         size_t count = op_data->op_data_size / sizeof(__u32);
 884
 885                         if (count > INLINE_RESYNC_ARRAY_SIZE)
 886                                 u32_count = count;
 887                 }
 888         } else {
 889                 req_fmt = &RQF_MDS_CLOSE;
 890         }
 891
 892         *request = NULL;
 893         if (OBD_FAIL_CHECK(OBD_FAIL_MDC_CLOSE))
 894                 req = NULL;
 895         else
 896                 req = ptlrpc_request_alloc(class_exp2cliimp(exp), req_fmt);
 897
 898         /* Ensure that this close's handle is fixed up during replay. */
 899         if (likely(mod != NULL)) {
 900                 LASSERTF(mod->mod_open_req != NULL &&
 901                          mod->mod_open_req->rq_type != LI_POISON,
 902                          "POISONED open %p!\n", mod->mod_open_req);
 903
 904                 mod->mod_close_req = req;
 905
 906                 DEBUG_REQ(D_RPCTRACE, mod->mod_open_req, "matched open");
 907                 /* We no longer want to preserve this open for replay even
 908                  * though the open was committed. b=3632, b=3633 */
 909                 spin_lock(&mod->mod_open_req->rq_lock);
 910                 mod->mod_open_req->rq_replay = 0;
 911                 spin_unlock(&mod->mod_open_req->rq_lock);
 912         } else {
 913                 CDEBUG(D_HA, "couldn't find open req; expecting close error\n");
 914         }
 915         if (req == NULL) {
 916                 /**
 917                  * TODO: repeat close after errors
 918                  */
 919                 CWARN("%s: close of FID "DFID" failed, file reference will be "
 920                       "dropped when this client unmounts or is evicted\n",
 921                       obd->obd_name, PFID(&op_data->op_fid1));
 922                 GOTO(out, rc = -ENOMEM);
 923         }
 924
 925         if (u32_count > 0)
 926                 req_capsule_set_size(&req->rq_pill, &RMF_U32, RCL_CLIENT,
 927                                      u32_count * sizeof(__u32));
 928
 929         rc = ptlrpc_request_pack(req, LUSTRE_MDS_VERSION, MDS_CLOSE);
 930         if (rc) {
 931                 ptlrpc_request_free(req);
 932                 req = NULL;
 933                 GOTO(out, rc);
 934         }
 935
 936         /* To avoid a livelock (bug 7034), we need to send CLOSE RPCs to a
 937          * portal whose threads are not taking any DLM locks and are therefore
 938          * always progressing */
 939         req->rq_request_portal = MDS_READPAGE_PORTAL;
 940         ptlrpc_at_set_req_timeout(req);
 941
 942         if (!(exp_connect_flags2(exp) & OBD_CONNECT2_LSOM))
 943                 op_data->op_xvalid &= ~(OP_XVALID_LAZYSIZE |
 944                                         OP_XVALID_LAZYBLOCKS);
 945
 946         mdc_close_pack(&req->rq_pill, op_data);
 947
 948         req_capsule_set_size(&req->rq_pill, &RMF_MDT_MD, RCL_SERVER,
 949                              obd->u.cli.cl_default_mds_easize);
 950
 951         ptlrpc_request_set_replen(req);
 952
 953         ptlrpc_get_mod_rpc_slot(req);
 954         rc = ptlrpc_queue_wait(req);
 955         ptlrpc_put_mod_rpc_slot(req);
 956
 957         if (req->rq_repmsg == NULL) {
 958                 CDEBUG(D_RPCTRACE, "request %p failed to send: rc = %d\n", req,
 959                        req->rq_status);
 960                 if (rc == 0)
 961                         rc = req->rq_status ?: -EIO;
 962         } else if (rc == 0 || rc == -EAGAIN) {
 963                 struct mdt_body *body;
 964
 965                 rc = lustre_msg_get_status(req->rq_repmsg);
 966                 if (lustre_msg_get_type(req->rq_repmsg) == PTL_RPC_MSG_ERR) {
 967                         DEBUG_REQ(D_ERROR, req,
 968                                   "type = PTL_RPC_MSG_ERR: rc = %d", rc);
 969                         if (rc > 0)
 970                                 rc = -rc;
 971                 }
 972                 body = req_capsule_server_get(&req->rq_pill, &RMF_MDT_BODY);
 973                 if (body == NULL)
 974                         rc = -EPROTO;
 975         } else if (rc == -ESTALE) {
 976                 /**
 977                  * it can be allowed error after 3633 if open was committed and
 978                  * server failed before close was sent. Let's check if mod
 979                  * exists and return no error in that case
 980                  */
 981                 if (mod) {
 982                         DEBUG_REQ(D_HA, req, "Reset ESTALE = %d", rc);
 983                         LASSERT(mod->mod_open_req != NULL);
 984                         if (mod->mod_open_req->rq_committed)
 985                                 rc = 0;
 986                 }
 987         }
 988
 989 out:
 990         if (mod) {
 991                 if (rc != 0)
 992                         mod->mod_close_req = NULL;
 993                 /* Since now, mod is accessed through open_req only,
 994                  * thus close req does not keep a reference on mod anymore. */
 995                 obd_mod_put(mod);
 996         }
 997         *request = req;
 998
 999         RETURN(rc < 0 ? rc : saved_rc);
1000 }
1001
1002 static int mdc_getpage(struct obd_export *exp, const struct lu_fid *fid,
1003                        u64 offset, struct page **pages, int npages,
1004                        struct ptlrpc_request **request)
1005 {
1006         struct ptlrpc_request   *req;
1007         struct ptlrpc_bulk_desc *desc;
1008         int                      i;
1009         int                      resends = 0;
1010         int                      rc;
1011         ENTRY;
1012
1013         *request = NULL;
1014
1015 restart_bulk:
1016         req = ptlrpc_request_alloc(class_exp2cliimp(exp), &RQF_MDS_READPAGE);
1017         if (req == NULL)
1018                 RETURN(-ENOMEM);
1019
1020         rc = ptlrpc_request_pack(req, LUSTRE_MDS_VERSION, MDS_READPAGE);
1021         if (rc) {
1022                 ptlrpc_request_free(req);
1023                 RETURN(rc);
1024         }
1025
1026         req->rq_request_portal = MDS_READPAGE_PORTAL;
1027         ptlrpc_at_set_req_timeout(req);
1028
1029         desc = ptlrpc_prep_bulk_imp(req, npages, 1,
1030                                     PTLRPC_BULK_PUT_SINK,
1031                                     MDS_BULK_PORTAL,
1032                                     &ptlrpc_bulk_kiov_pin_ops);
1033         if (desc == NULL) {
1034                 ptlrpc_req_finished(req);
1035                 RETURN(-ENOMEM);
1036         }
1037
1038         /* NB req now owns desc and will free it when it gets freed */
1039         for (i = 0; i < npages; i++)
1040                 desc->bd_frag_ops->add_kiov_frag(desc, pages[i], 0,
1041                                                  PAGE_SIZE);
1042
1043         mdc_readdir_pack(&req->rq_pill, offset, PAGE_SIZE * npages, fid);
1044
1045         ptlrpc_request_set_replen(req);
1046         rc = ptlrpc_queue_wait(req);
1047         if (rc) {
1048                 ptlrpc_req_finished(req);
1049                 if (rc != -ETIMEDOUT)
1050                         RETURN(rc);
1051
1052                 resends++;
1053                 if (!client_should_resend(resends, &exp->exp_obd->u.cli)) {
1054                         CERROR("%s: too many resend retries: rc = %d\n",
1055                                exp->exp_obd->obd_name, -EIO);
1056                         RETURN(-EIO);
1057                 }
1058
1059                 /* If a signal interrupts then the timeout returned will
1060                  * not be zero. In that case return -EINTR
1061                  */
1062                 if (msleep_interruptible(resends * 1000))
1063                         RETURN(-EINTR);
1064
1065                 goto restart_bulk;
1066         }
1067
1068         rc = sptlrpc_cli_unwrap_bulk_read(req, req->rq_bulk,
1069                                           req->rq_bulk->bd_nob_transferred);
1070         if (rc < 0) {
1071                 ptlrpc_req_finished(req);
1072                 RETURN(rc);
1073         }
1074
1075         if (req->rq_bulk->bd_nob_transferred & ~LU_PAGE_MASK) {
1076                 CERROR("%s: unexpected bytes transferred: %d (%ld expected)\n",
1077                        exp->exp_obd->obd_name, req->rq_bulk->bd_nob_transferred,
1078                        PAGE_SIZE * npages);
1079                 ptlrpc_req_finished(req);
1080                 RETURN(-EPROTO);
1081         }
1082
1083         *request = req;
1084         RETURN(0);
1085 }
1086
1087 static void mdc_release_page(struct page *page, int remove)
1088 {
1089         if (remove) {
1090                 lock_page(page);
1091                 if (likely(page->mapping != NULL))
1092                         delete_from_page_cache(page);
1093                 unlock_page(page);
1094         }
1095         put_page(page);
1096 }
1097
1098 static struct page *mdc_page_locate(struct address_space *mapping, __u64 *hash,
1099                                     __u64 *start, __u64 *end, int hash64)
1100 {
1101         /*
1102          * Complement of hash is used as an index so that
1103          * radix_tree_gang_lookup() can be used to find a page with starting
1104          * hash _smaller_ than one we are looking for.
1105          */
1106         unsigned long offset = hash_x_index(*hash, hash64);
1107         struct page *page;
1108         unsigned long flags;
1109         int found;
1110
1111         ll_xa_lock_irqsave(&mapping->i_pages, flags);
1112         found = radix_tree_gang_lookup(&mapping->page_tree,
1113                                        (void **)&page, offset, 1);
1114         if (found > 0 && !ll_xa_is_value(page)) {
1115                 struct lu_dirpage *dp;
1116
1117                 get_page(page);
1118                 ll_xa_unlock_irqrestore(&mapping->i_pages, flags);
1119                 /*
1120                  * In contrast to find_lock_page() we are sure that directory
1121                  * page cannot be truncated (while DLM lock is held) and,
1122                  * hence, can avoid restart.
1123                  *
1124                  * In fact, page cannot be locked here at all, because
1125                  * mdc_read_page_remote does synchronous io.
1126                  */
1127                 wait_on_page_locked(page);
1128                 if (PageUptodate(page)) {
1129                         dp = kmap(page);
1130                         if (BITS_PER_LONG == 32 && hash64) {
1131                                 *start = le64_to_cpu(dp->ldp_hash_start) >> 32;
1132                                 *end   = le64_to_cpu(dp->ldp_hash_end) >> 32;
1133                                 *hash  = *hash >> 32;
1134                         } else {
1135                                 *start = le64_to_cpu(dp->ldp_hash_start);
1136                                 *end   = le64_to_cpu(dp->ldp_hash_end);
1137                         }
1138                         if (unlikely(*start == 1 && *hash == 0))
1139                                 *hash = *start;
1140                         else
1141                                 LASSERTF(*start <= *hash, "start = %#llx"
1142                                          ",end = %#llx,hash = %#llx\n",
1143                                          *start, *end, *hash);
1144                         CDEBUG(D_VFSTRACE, "offset %lx [%#llx %#llx],"
1145                               " hash %#llx\n", offset, *start, *end, *hash);
1146                         if (*hash > *end) {
1147                                 kunmap(page);
1148                                 mdc_release_page(page, 0);
1149                                 page = NULL;
1150                         } else if (*end != *start && *hash == *end) {
1151                                 /*
1152                                  * upon hash collision, remove this page,
1153                                  * otherwise put page reference, and
1154                                  * mdc_read_page_remote() will issue RPC to
1155                                  * fetch the page we want.
1156                                  */
1157                                 kunmap(page);
1158                                 mdc_release_page(page,
1159                                     le32_to_cpu(dp->ldp_flags) & LDF_COLLIDE);
1160                                 page = NULL;
1161                         }
1162                 } else {
1163                         put_page(page);
1164                         page = ERR_PTR(-EIO);
1165                 }
1166         } else {
1167                 ll_xa_unlock_irqrestore(&mapping->i_pages, flags);
1168                 page = NULL;
1169         }
1170         return page;
1171 }
1172
1173 /*
1174  * Adjust a set of pages, each page containing an array of lu_dirpages,
1175  * so that each page can be used as a single logical lu_dirpage.
1176  *
1177  * A lu_dirpage is laid out as follows, where s = ldp_hash_start,
1178  * e = ldp_hash_end, f = ldp_flags, p = padding, and each "ent" is a
1179  * struct lu_dirent.  It has size up to LU_PAGE_SIZE. The ldp_hash_end
1180  * value is used as a cookie to request the next lu_dirpage in a
1181  * directory listing that spans multiple pages (two in this example):
1182  *   ________
1183  *  |        |
1184  * .|--------v-------   -----.
1185  * |s|e|f|p|ent|ent| ... |ent|
1186  * '--|--------------   -----'   Each PAGE contains a single
1187  *    '------.                   lu_dirpage.
1188  * .---------v-------   -----.
1189  * |s|e|f|p|ent| 0 | ... | 0 |
1190  * '-----------------   -----'
1191  *
1192  * However, on hosts where the native VM page size (PAGE_SIZE) is
1193  * larger than LU_PAGE_SIZE, a single host page may contain multiple
1194  * lu_dirpages. After reading the lu_dirpages from the MDS, the
1195  * ldp_hash_end of the first lu_dirpage refers to the one immediately
1196  * after it in the same PAGE (arrows simplified for brevity, but
1197  * in general e0==s1, e1==s2, etc.):
1198  *
1199  * .--------------------   -----.
1200  * |s0|e0|f0|p|ent|ent| ... |ent|
1201  * |---v----------------   -----|
1202  * |s1|e1|f1|p|ent|ent| ... |ent|
1203  * |---v----------------   -----|  Here, each PAGE contains
1204  *             ...                 multiple lu_dirpages.
1205  * |---v----------------   -----|
1206  * |s'|e'|f'|p|ent|ent| ... |ent|
1207  * '---|----------------   -----'
1208  *     v
1209  * .----------------------------.
1210  * |        next PAGE           |
1211  *
1212  * This structure is transformed into a single logical lu_dirpage as follows:
1213  *
1214  * - Replace e0 with e' so the request for the next lu_dirpage gets the page
1215  *   labeled 'next PAGE'.
1216  *
1217  * - Copy the LDF_COLLIDE flag from f' to f0 to correctly reflect whether
1218  *   a hash collision with the next page exists.
1219  *
1220  * - Adjust the lde_reclen of the ending entry of each lu_dirpage to span
1221  *   to the first entry of the next lu_dirpage.
1222  */
1223 #if PAGE_SIZE > LU_PAGE_SIZE
1224 static void mdc_adjust_dirpages(struct page **pages, int cfs_pgs, int lu_pgs)
1225 {
1226         int i;
1227
1228         for (i = 0; i < cfs_pgs; i++) {
1229                 struct lu_dirpage *dp = kmap(pages[i]);
1230                 struct lu_dirpage *first = dp;
1231                 struct lu_dirent *end_dirent = NULL;
1232                 struct lu_dirent *ent;
1233                 __u64 hash_end = dp->ldp_hash_end;
1234                 __u32 flags = dp->ldp_flags;
1235
1236                 while (--lu_pgs > 0) {
1237                         ent = lu_dirent_start(dp);
1238                         for (end_dirent = ent; ent != NULL;
1239                              end_dirent = ent, ent = lu_dirent_next(ent));
1240
1241                         /* Advance dp to next lu_dirpage. */
1242                         dp = (struct lu_dirpage *)((char *)dp + LU_PAGE_SIZE);
1243
1244                         /* Check if we've reached the end of the PAGE. */
1245                         if (!((unsigned long)dp & ~PAGE_MASK))
1246                                 break;
1247
1248                         /* Save the hash and flags of this lu_dirpage. */
1249                         hash_end = dp->ldp_hash_end;
1250                         flags = dp->ldp_flags;
1251
1252                         /* Check if lu_dirpage contains no entries. */
1253                         if (end_dirent == NULL)
1254                                 break;
1255
1256                         /* Enlarge the end entry lde_reclen from 0 to
1257                          * first entry of next lu_dirpage. */
1258                         LASSERT(le16_to_cpu(end_dirent->lde_reclen) == 0);
1259                         end_dirent->lde_reclen =
1260                                 cpu_to_le16((char *)(dp->ldp_entries) -
1261                                             (char *)end_dirent);
1262                 }
1263
1264                 first->ldp_hash_end = hash_end;
1265                 first->ldp_flags &= ~cpu_to_le32(LDF_COLLIDE);
1266                 first->ldp_flags |= flags & cpu_to_le32(LDF_COLLIDE);
1267
1268                 kunmap(pages[i]);
1269         }
1270         LASSERTF(lu_pgs == 0, "left = %d\n", lu_pgs);
1271 }
1272 #else
1273 #define mdc_adjust_dirpages(pages, cfs_pgs, lu_pgs) do {} while (0)
1274 #endif  /* PAGE_SIZE > LU_PAGE_SIZE */
1275
1276 /* parameters for readdir page */
1277 struct readpage_param {
1278         struct md_op_data       *rp_mod;
1279         __u64                   rp_off;
1280         int                     rp_hash64;
1281         struct obd_export       *rp_exp;
1282         struct md_callback      *rp_cb;
1283 };
1284
1285 /**
1286  * Read pages from server.
1287  *
1288  * Page in MDS_READPAGE RPC is packed in LU_PAGE_SIZE, and each page contains
1289  * a header lu_dirpage which describes the start/end hash, and whether this
1290  * page is empty (contains no dir entry) or hash collide with next page.
1291  * After client receives reply, several pages will be integrated into dir page
1292  * in PAGE_SIZE (if PAGE_SIZE greater than LU_PAGE_SIZE), and the
1293  * lu_dirpage for this integrated page will be adjusted.
1294  **/
1295 static int mdc_read_page_remote(void *data, struct page *page0)
1296 {
1297         struct readpage_param *rp = data;
1298         struct page **page_pool;
1299         struct page *page;
1300         struct lu_dirpage *dp;
1301         struct md_op_data *op_data = rp->rp_mod;
1302         struct ptlrpc_request *req;
1303         int max_pages;
1304         struct inode *inode;
1305         struct lu_fid *fid;
1306         int rd_pgs = 0; /* number of pages actually read */
1307         int npages;
1308         int i;
1309         int rc;
1310         ENTRY;
1311
1312         max_pages = rp->rp_exp->exp_obd->u.cli.cl_max_pages_per_rpc;
1313         inode = op_data->op_data;
1314         fid = &op_data->op_fid1;
1315         LASSERT(inode != NULL);
1316
1317         OBD_ALLOC_PTR_ARRAY_LARGE(page_pool, max_pages);
1318         if (page_pool != NULL) {
1319                 page_pool[0] = page0;
1320         } else {
1321                 page_pool = &page0;
1322                 max_pages = 1;
1323         }
1324
1325         for (npages = 1; npages < max_pages; npages++) {
1326                 page = page_cache_alloc(inode->i_mapping);
1327                 if (page == NULL)
1328                         break;
1329                 page_pool[npages] = page;
1330         }
1331
1332         rc = mdc_getpage(rp->rp_exp, fid, rp->rp_off, page_pool, npages, &req);
1333         if (rc < 0) {
1334                 /* page0 is special, which was added into page cache early */
1335                 delete_from_page_cache(page0);
1336         } else {
1337                 int lu_pgs;
1338
1339                 rd_pgs = (req->rq_bulk->bd_nob_transferred + PAGE_SIZE - 1) >>
1340                         PAGE_SHIFT;
1341                 lu_pgs = req->rq_bulk->bd_nob_transferred >> LU_PAGE_SHIFT;
1342                 LASSERT(!(req->rq_bulk->bd_nob_transferred & ~LU_PAGE_MASK));
1343
1344                 CDEBUG(D_INODE, "read %d(%d) pages\n", rd_pgs, lu_pgs);
1345
1346                 mdc_adjust_dirpages(page_pool, rd_pgs, lu_pgs);
1347
1348                 SetPageUptodate(page0);
1349         }
1350         unlock_page(page0);
1351
1352         ptlrpc_req_finished(req);
1353         CDEBUG(D_CACHE, "read %d/%d pages\n", rd_pgs, npages);
1354         for (i = 1; i < npages; i++) {
1355                 unsigned long   offset;
1356                 __u64           hash;
1357                 int ret;
1358
1359                 page = page_pool[i];
1360
1361                 if (rc < 0 || i >= rd_pgs) {
1362                         put_page(page);
1363                         continue;
1364                 }
1365
1366                 SetPageUptodate(page);
1367
1368                 dp = kmap(page);
1369                 hash = le64_to_cpu(dp->ldp_hash_start);
1370                 kunmap(page);
1371
1372                 offset = hash_x_index(hash, rp->rp_hash64);
1373
1374                 prefetchw(&page->flags);
1375                 ret = add_to_page_cache_lru(page, inode->i_mapping, offset,
1376                                             GFP_KERNEL);
1377                 if (ret == 0)
1378                         unlock_page(page);
1379                 else
1380                         CDEBUG(D_VFSTRACE, "page %lu add to page cache failed:"
1381                                " rc = %d\n", offset, ret);
1382                 put_page(page);
1383         }
1384
1385         if (page_pool != &page0)
1386                 OBD_FREE_PTR_ARRAY_LARGE(page_pool, max_pages);
1387
1388         RETURN(rc);
1389 }
1390
1391 /**
1392  * Read dir page from cache first, if it can not find it, read it from
1393  * server and add into the cache.
1394  *
1395  * \param[in] exp       MDC export
1396  * \param[in] op_data   client MD stack parameters, transfering parameters
1397  *                      between different layers on client MD stack.
1398  * \param[in] cb_op     callback required for ldlm lock enqueue during
1399  *                      read page
1400  * \param[in] hash_offset the hash offset of the page to be read
1401  * \param[in] ppage     the page to be read
1402  *
1403  * retval               = 0 get the page successfully
1404  *                      errno(<0) get the page failed
1405  */
1406 static int mdc_read_page(struct obd_export *exp, struct md_op_data *op_data,
1407                          struct md_callback *cb_op, __u64 hash_offset,
1408                          struct page **ppage)
1409 {
1410         struct lookup_intent    it = { .it_op = IT_READDIR };
1411         struct page             *page;
1412         struct inode            *dir = op_data->op_data;
1413         struct address_space    *mapping;
1414         struct lu_dirpage       *dp;
1415         __u64                   start = 0;
1416         __u64                   end = 0;
1417         struct lustre_handle    lockh;
1418         struct ptlrpc_request   *enq_req = NULL;
1419         struct readpage_param   rp_param;
1420         int rc;
1421
1422         ENTRY;
1423
1424         *ppage = NULL;
1425
1426         LASSERT(dir != NULL);
1427         mapping = dir->i_mapping;
1428
1429         rc = mdc_intent_lock(exp, op_data, &it, &enq_req,
1430                              cb_op->md_blocking_ast, 0);
1431         if (enq_req != NULL)
1432                 ptlrpc_req_finished(enq_req);
1433
1434         if (rc < 0) {
1435                 CERROR("%s: "DFID" lock enqueue fails: rc = %d\n",
1436                        exp->exp_obd->obd_name, PFID(&op_data->op_fid1), rc);
1437                 RETURN(rc);
1438         }
1439
1440         rc = 0;
1441         lockh.cookie = it.it_lock_handle;
1442         mdc_set_lock_data(exp, &lockh, dir, NULL);
1443
1444         rp_param.rp_off = hash_offset;
1445         rp_param.rp_hash64 = op_data->op_cli_flags & CLI_HASH64;
1446         page = mdc_page_locate(mapping, &rp_param.rp_off, &start, &end,
1447                                rp_param.rp_hash64);
1448         if (IS_ERR(page)) {
1449                 CERROR("%s: dir page locate: "DFID" at %llu: rc %ld\n",
1450                        exp->exp_obd->obd_name, PFID(&op_data->op_fid1),
1451                        rp_param.rp_off, PTR_ERR(page));
1452                 GOTO(out_unlock, rc = PTR_ERR(page));
1453         } else if (page != NULL) {
1454                 /*
1455                  * XXX nikita: not entirely correct handling of a corner case:
1456                  * suppose hash chain of entries with hash value HASH crosses
1457                  * border between pages P0 and P1. First both P0 and P1 are
1458                  * cached, seekdir() is called for some entry from the P0 part
1459                  * of the chain. Later P0 goes out of cache. telldir(HASH)
1460                  * happens and finds P1, as it starts with matching hash
1461                  * value. Remaining entries from P0 part of the chain are
1462                  * skipped. (Is that really a bug?)
1463                  *
1464                  * Possible solutions: 0. don't cache P1 is such case, handle
1465                  * it as an "overflow" page. 1. invalidate all pages at
1466                  * once. 2. use HASH|1 as an index for P1.
1467                  */
1468                 GOTO(hash_collision, page);
1469         }
1470
1471         rp_param.rp_exp = exp;
1472         rp_param.rp_mod = op_data;
1473         page = read_cache_page(mapping,
1474                                hash_x_index(rp_param.rp_off,
1475                                             rp_param.rp_hash64),
1476                                mdc_read_page_remote, &rp_param);
1477         if (IS_ERR(page)) {
1478                 CDEBUG(D_INFO, "%s: read cache page: "DFID" at %llu: %ld\n",
1479                        exp->exp_obd->obd_name, PFID(&op_data->op_fid1),
1480                        rp_param.rp_off, PTR_ERR(page));
1481                 GOTO(out_unlock, rc = PTR_ERR(page));
1482         }
1483
1484         wait_on_page_locked(page);
1485         (void)kmap(page);
1486         if (!PageUptodate(page)) {
1487                 CERROR("%s: page not updated: "DFID" at %llu: rc %d\n",
1488                        exp->exp_obd->obd_name, PFID(&op_data->op_fid1),
1489                        rp_param.rp_off, -5);
1490                 goto fail;
1491         }
1492         if (!PageChecked(page))
1493                 SetPageChecked(page);
1494         if (PageError(page)) {
1495                 CERROR("%s: page error: "DFID" at %llu: rc %d\n",
1496                        exp->exp_obd->obd_name, PFID(&op_data->op_fid1),
1497                        rp_param.rp_off, -5);
1498                 goto fail;
1499         }
1500
1501 hash_collision:
1502         dp = page_address(page);
1503         if (BITS_PER_LONG == 32 && rp_param.rp_hash64) {
1504                 start = le64_to_cpu(dp->ldp_hash_start) >> 32;
1505                 end   = le64_to_cpu(dp->ldp_hash_end) >> 32;
1506                 rp_param.rp_off = hash_offset >> 32;
1507         } else {
1508                 start = le64_to_cpu(dp->ldp_hash_start);
1509                 end   = le64_to_cpu(dp->ldp_hash_end);
1510                 rp_param.rp_off = hash_offset;
1511         }
1512         if (end == start) {
1513                 LASSERT(start == rp_param.rp_off);
1514                 CWARN("Page-wide hash collision: %#lx\n", (unsigned long)end);
1515 #if BITS_PER_LONG == 32
1516                 CWARN("Real page-wide hash collision at [%llu %llu] with "
1517                       "hash %llu\n", le64_to_cpu(dp->ldp_hash_start),
1518                       le64_to_cpu(dp->ldp_hash_end), hash_offset);
1519 #endif
1520
1521                 /*
1522                  * Fetch whole overflow chain...
1523                  *
1524                  * XXX not yet.
1525                  */
1526                 goto fail;
1527         }
1528         *ppage = page;
1529 out_unlock:
1530         ldlm_lock_decref(&lockh, it.it_lock_mode);
1531         return rc;
1532 fail:
1533         kunmap(page);
1534         mdc_release_page(page, 1);
1535         rc = -EIO;
1536         goto out_unlock;
1537 }
1538
1539 static int mdc_statfs_interpret(const struct lu_env *env,
1540                                 struct ptlrpc_request *req, void *args, int rc)
1541 {
1542         struct obd_info *oinfo = args;
1543         struct obd_statfs *osfs;
1544
1545         if (!rc) {
1546                 osfs = req_capsule_server_get(&req->rq_pill, &RMF_OBD_STATFS);
1547                 if (!osfs)
1548                         return -EPROTO;
1549
1550                 oinfo->oi_osfs = osfs;
1551
1552                 CDEBUG(D_CACHE, "blocks=%llu free=%llu avail=%llu "
1553                        "objects=%llu free=%llu state=%x\n",
1554                         osfs->os_blocks, osfs->os_bfree, osfs->os_bavail,
1555                         osfs->os_files, osfs->os_ffree, osfs->os_state);
1556         }
1557
1558         oinfo->oi_cb_up(oinfo, rc);
1559
1560         return rc;
1561 }
1562
1563 static int mdc_statfs_async(struct obd_export *exp,
1564                             struct obd_info *oinfo, time64_t max_age,
1565                             struct ptlrpc_request_set *unused)
1566 {
1567         struct ptlrpc_request *req;
1568         struct obd_info *aa;
1569
1570         req = ptlrpc_request_alloc_pack(class_exp2cliimp(exp), &RQF_MDS_STATFS,
1571                                         LUSTRE_MDS_VERSION, MDS_STATFS);
1572         if (req == NULL)
1573                 return -ENOMEM;
1574
1575         ptlrpc_request_set_replen(req);
1576         req->rq_interpret_reply = mdc_statfs_interpret;
1577
1578         aa = ptlrpc_req_async_args(aa, req);
1579         *aa = *oinfo;
1580
1581         ptlrpcd_add_req(req);
1582
1583         return 0;
1584 }
1585
1586 static int mdc_statfs(const struct lu_env *env,
1587                       struct obd_export *exp, struct obd_statfs *osfs,
1588                       time64_t max_age, __u32 flags)
1589 {
1590         struct obd_device *obd = class_exp2obd(exp);
1591         struct req_format *fmt;
1592         struct ptlrpc_request *req;
1593         struct obd_statfs *msfs;
1594         struct obd_import *imp, *imp0;
1595         int rc;
1596         ENTRY;
1597
1598         /*
1599          * Since the request might also come from lprocfs, so we need
1600          * sync this with client_disconnect_export Bug15684
1601          */
1602         with_imp_locked(obd, imp0, rc)
1603                 imp = class_import_get(imp0);
1604         if (rc)
1605                 RETURN(rc);
1606
1607         fmt = &RQF_MDS_STATFS;
1608         if ((exp_connect_flags2(exp) & OBD_CONNECT2_SUM_STATFS) &&
1609             (flags & OBD_STATFS_SUM))
1610                 fmt = &RQF_MDS_STATFS_NEW;
1611         req = ptlrpc_request_alloc_pack(imp, fmt, LUSTRE_MDS_VERSION,
1612                                         MDS_STATFS);
1613         if (req == NULL)
1614                 GOTO(output, rc = -ENOMEM);
1615         req->rq_allow_intr = 1;
1616
1617         if ((flags & OBD_STATFS_SUM) &&
1618             (exp_connect_flags2(exp) & OBD_CONNECT2_SUM_STATFS)) {
1619                 /* request aggregated states */
1620                 struct mdt_body *body;
1621
1622                 body = req_capsule_client_get(&req->rq_pill, &RMF_MDT_BODY);
1623                 if (body == NULL)
1624                         GOTO(out, rc = -EPROTO);
1625                 body->mbo_valid = OBD_MD_FLAGSTATFS;
1626         }
1627
1628         ptlrpc_request_set_replen(req);
1629
1630         if (flags & OBD_STATFS_NODELAY) {
1631                 /* procfs requests not want stay in wait for avoid deadlock */
1632                 req->rq_no_resend = 1;
1633                 req->rq_no_delay = 1;
1634         }
1635
1636         rc = ptlrpc_queue_wait(req);
1637         if (rc) {
1638                 /* check connection error first */
1639                 if (imp->imp_connect_error)
1640                         rc = imp->imp_connect_error;
1641                 GOTO(out, rc);
1642         }
1643
1644         msfs = req_capsule_server_get(&req->rq_pill, &RMF_OBD_STATFS);
1645         if (msfs == NULL)
1646                 GOTO(out, rc = -EPROTO);
1647
1648         *osfs = *msfs;
1649         EXIT;
1650 out:
1651         ptlrpc_req_finished(req);
1652 output:
1653         class_import_put(imp);
1654         return rc;
1655 }
1656
1657 static int mdc_ioc_fid2path(struct obd_export *exp, struct getinfo_fid2path *gf)
1658 {
1659         __u32 keylen, vallen;
1660         void *key;
1661         int rc;
1662
1663         if (gf->gf_pathlen > PATH_MAX)
1664                 RETURN(-ENAMETOOLONG);
1665         if (gf->gf_pathlen < 2)
1666                 RETURN(-EOVERFLOW);
1667
1668         /* Key is KEY_FID2PATH + getinfo_fid2path description */
1669         keylen = cfs_size_round(sizeof(KEY_FID2PATH) + sizeof(*gf) +
1670                                 sizeof(struct lu_fid));
1671         OBD_ALLOC(key, keylen);
1672         if (key == NULL)
1673                 RETURN(-ENOMEM);
1674         memcpy(key, KEY_FID2PATH, sizeof(KEY_FID2PATH));
1675         memcpy(key + cfs_size_round(sizeof(KEY_FID2PATH)), gf, sizeof(*gf));
1676         memcpy(key + cfs_size_round(sizeof(KEY_FID2PATH)) + sizeof(*gf),
1677                gf->gf_u.gf_root_fid, sizeof(struct lu_fid));
1678         CDEBUG(D_IOCTL, "path get "DFID" from %llu #%d\n",
1679                PFID(&gf->gf_fid), gf->gf_recno, gf->gf_linkno);
1680
1681         if (!fid_is_sane(&gf->gf_fid))
1682                 GOTO(out, rc = -EINVAL);
1683
1684         /* Val is struct getinfo_fid2path result plus path */
1685         vallen = sizeof(*gf) + gf->gf_pathlen;
1686
1687         rc = obd_get_info(NULL, exp, keylen, key, &vallen, gf);
1688         if (rc != 0 && rc != -EREMOTE)
1689                 GOTO(out, rc);
1690
1691         if (vallen <= sizeof(*gf))
1692                 GOTO(out, rc = -EPROTO);
1693         if (vallen > sizeof(*gf) + gf->gf_pathlen)
1694                 GOTO(out, rc = -EOVERFLOW);
1695
1696         CDEBUG(D_IOCTL, "path got "DFID" from %llu #%d: %s\n",
1697                PFID(&gf->gf_fid), gf->gf_recno, gf->gf_linkno,
1698                gf->gf_pathlen < 512 ? gf->gf_u.gf_path :
1699                /* only log the last 512 characters of the path */
1700                gf->gf_u.gf_path + gf->gf_pathlen - 512);
1701
1702 out:
1703         OBD_FREE(key, keylen);
1704         return rc;
1705 }
1706
1707 static int mdc_ioc_hsm_progress(struct obd_export *exp,
1708                                 struct hsm_progress_kernel *hpk)
1709 {
1710         struct obd_import               *imp = class_exp2cliimp(exp);
1711         struct hsm_progress_kernel      *req_hpk;
1712         struct ptlrpc_request           *req;
1713         int                              rc;
1714         ENTRY;
1715
1716         req = ptlrpc_request_alloc_pack(imp, &RQF_MDS_HSM_PROGRESS,
1717                                         LUSTRE_MDS_VERSION, MDS_HSM_PROGRESS);
1718         if (req == NULL)
1719                 GOTO(out, rc = -ENOMEM);
1720
1721         mdc_pack_body(&req->rq_pill, NULL, 0, 0, -1, 0);
1722
1723         /* Copy hsm_progress struct */
1724         req_hpk = req_capsule_client_get(&req->rq_pill, &RMF_MDS_HSM_PROGRESS);
1725         if (req_hpk == NULL)
1726                 GOTO(out, rc = -EPROTO);
1727
1728         *req_hpk = *hpk;
1729         req_hpk->hpk_errval = lustre_errno_hton(hpk->hpk_errval);
1730
1731         ptlrpc_request_set_replen(req);
1732
1733         ptlrpc_get_mod_rpc_slot(req);
1734         rc = ptlrpc_queue_wait(req);
1735         ptlrpc_put_mod_rpc_slot(req);
1736
1737         GOTO(out, rc);
1738 out:
1739         ptlrpc_req_finished(req);
1740         return rc;
1741 }
1742 /**
1743  * Send hsm_ct_register to MDS
1744  *
1745  * \param[in]   imp             import
1746  * \param[in]   archive_count   if in bitmap format, it is the bitmap,
1747  *                              else it is the count of archive_ids
1748  * \param[in]   archives        if in bitmap format, it is NULL,
1749  *                              else it is archive_id lists
1750  */
1751 static int mdc_ioc_hsm_ct_register(struct obd_import *imp, __u32 archive_count,
1752                                    __u32 *archives)
1753 {
1754         struct ptlrpc_request *req;
1755         __u32 *archive_array;
1756         size_t archives_size;
1757         int rc;
1758         ENTRY;
1759
1760         req = ptlrpc_request_alloc(imp, &RQF_MDS_HSM_CT_REGISTER);
1761         if (req == NULL)
1762                 RETURN(-ENOMEM);
1763
1764         if (archives != NULL)
1765                 archives_size = sizeof(*archive_array) * archive_count;
1766         else
1767                 archives_size = sizeof(archive_count);
1768
1769         req_capsule_set_size(&req->rq_pill, &RMF_MDS_HSM_ARCHIVE,
1770                              RCL_CLIENT, archives_size);
1771
1772         rc = ptlrpc_request_pack(req, LUSTRE_MDS_VERSION, MDS_HSM_CT_REGISTER);
1773         if (rc) {
1774                 ptlrpc_request_free(req);
1775                 RETURN(-ENOMEM);
1776         }
1777
1778         mdc_pack_body(&req->rq_pill, NULL, 0, 0, -1, 0);
1779
1780         archive_array = req_capsule_client_get(&req->rq_pill,
1781                                                &RMF_MDS_HSM_ARCHIVE);
1782         if (archive_array == NULL)
1783                 GOTO(out, rc = -EPROTO);
1784
1785         if (archives != NULL)
1786                 memcpy(archive_array, archives, archives_size);
1787         else
1788                 *archive_array = archive_count;
1789
1790         ptlrpc_request_set_replen(req);
1791         req->rq_no_resend = 1;
1792
1793         rc = mdc_queue_wait(req);
1794         GOTO(out, rc);
1795 out:
1796         ptlrpc_req_finished(req);
1797         return rc;
1798 }
1799
1800 static int mdc_ioc_hsm_current_action(struct obd_export *exp,
1801                                       struct md_op_data *op_data)
1802 {
1803         struct hsm_current_action       *hca = op_data->op_data;
1804         struct hsm_current_action       *req_hca;
1805         struct ptlrpc_request           *req;
1806         int                              rc;
1807         ENTRY;
1808
1809         req = ptlrpc_request_alloc(class_exp2cliimp(exp),
1810                                    &RQF_MDS_HSM_ACTION);
1811         if (req == NULL)
1812                 RETURN(-ENOMEM);
1813
1814         rc = ptlrpc_request_pack(req, LUSTRE_MDS_VERSION, MDS_HSM_ACTION);
1815         if (rc) {
1816                 ptlrpc_request_free(req);
1817                 RETURN(rc);
1818         }
1819
1820         mdc_pack_body(&req->rq_pill, &op_data->op_fid1, 0, 0,
1821                       op_data->op_suppgids[0], 0);
1822
1823         ptlrpc_request_set_replen(req);
1824
1825         rc = mdc_queue_wait(req);
1826         if (rc)
1827                 GOTO(out, rc);
1828
1829         req_hca = req_capsule_server_get(&req->rq_pill,
1830                                          &RMF_MDS_HSM_CURRENT_ACTION);
1831         if (req_hca == NULL)
1832                 GOTO(out, rc = -EPROTO);
1833
1834         *hca = *req_hca;
1835
1836         EXIT;
1837 out:
1838         ptlrpc_req_finished(req);
1839         return rc;
1840 }
1841
1842 static int mdc_ioc_hsm_ct_unregister(struct obd_import *imp)
1843 {
1844         struct ptlrpc_request   *req;
1845         int                      rc;
1846         ENTRY;
1847
1848         req = ptlrpc_request_alloc_pack(imp, &RQF_MDS_HSM_CT_UNREGISTER,
1849                                         LUSTRE_MDS_VERSION,
1850                                         MDS_HSM_CT_UNREGISTER);
1851         if (req == NULL)
1852                 GOTO(out, rc = -ENOMEM);
1853
1854         mdc_pack_body(&req->rq_pill, NULL, 0, 0, -1, 0);
1855
1856         ptlrpc_request_set_replen(req);
1857
1858         rc = mdc_queue_wait(req);
1859         GOTO(out, rc);
1860 out:
1861         ptlrpc_req_finished(req);
1862         return rc;
1863 }
1864
1865 static int mdc_ioc_hsm_state_get(struct obd_export *exp,
1866                                  struct md_op_data *op_data)
1867 {
1868         struct hsm_user_state   *hus = op_data->op_data;
1869         struct hsm_user_state   *req_hus;
1870         struct ptlrpc_request   *req;
1871         int                      rc;
1872         ENTRY;
1873
1874         req = ptlrpc_request_alloc(class_exp2cliimp(exp),
1875                                    &RQF_MDS_HSM_STATE_GET);
1876         if (req == NULL)
1877                 RETURN(-ENOMEM);
1878
1879         rc = ptlrpc_request_pack(req, LUSTRE_MDS_VERSION, MDS_HSM_STATE_GET);
1880         if (rc != 0) {
1881                 ptlrpc_request_free(req);
1882                 RETURN(rc);
1883         }
1884
1885         mdc_pack_body(&req->rq_pill, &op_data->op_fid1, 0, 0,
1886                       op_data->op_suppgids[0], 0);
1887
1888         ptlrpc_request_set_replen(req);
1889
1890         rc = mdc_queue_wait(req);
1891         if (rc)
1892                 GOTO(out, rc);
1893
1894         req_hus = req_capsule_server_get(&req->rq_pill, &RMF_HSM_USER_STATE);
1895         if (req_hus == NULL)
1896                 GOTO(out, rc = -EPROTO);
1897
1898         *hus = *req_hus;
1899
1900         EXIT;
1901 out:
1902         ptlrpc_req_finished(req);
1903         return rc;
1904 }
1905
1906 static int mdc_ioc_hsm_state_set(struct obd_export *exp,
1907                                  struct md_op_data *op_data)
1908 {
1909         struct hsm_state_set    *hss = op_data->op_data;
1910         struct hsm_state_set    *req_hss;
1911         struct ptlrpc_request   *req;
1912         int                      rc;
1913         ENTRY;
1914
1915         req = ptlrpc_request_alloc(class_exp2cliimp(exp),
1916                                    &RQF_MDS_HSM_STATE_SET);
1917         if (req == NULL)
1918                 RETURN(-ENOMEM);
1919
1920         rc = ptlrpc_request_pack(req, LUSTRE_MDS_VERSION, MDS_HSM_STATE_SET);
1921         if (rc) {
1922                 ptlrpc_request_free(req);
1923                 RETURN(rc);
1924         }
1925
1926         mdc_pack_body(&req->rq_pill, &op_data->op_fid1, 0, 0,
1927                       op_data->op_suppgids[0], 0);
1928
1929         /* Copy states */
1930         req_hss = req_capsule_client_get(&req->rq_pill, &RMF_HSM_STATE_SET);
1931         if (req_hss == NULL)
1932                 GOTO(out, rc = -EPROTO);
1933         *req_hss = *hss;
1934
1935         ptlrpc_request_set_replen(req);
1936
1937         ptlrpc_get_mod_rpc_slot(req);
1938         rc = ptlrpc_queue_wait(req);
1939         ptlrpc_put_mod_rpc_slot(req);
1940
1941         GOTO(out, rc);
1942 out:
1943         ptlrpc_req_finished(req);
1944         return rc;
1945 }
1946
1947 static int mdc_ioc_hsm_request(struct obd_export *exp,
1948                                struct hsm_user_request *hur)
1949 {
1950         struct obd_import       *imp = class_exp2cliimp(exp);
1951         struct ptlrpc_request   *req;
1952         struct hsm_request      *req_hr;
1953         struct hsm_user_item    *req_hui;
1954         char                    *req_opaque;
1955         int                      rc;
1956         ENTRY;
1957
1958         req = ptlrpc_request_alloc(imp, &RQF_MDS_HSM_REQUEST);
1959         if (req == NULL)
1960                 GOTO(out, rc = -ENOMEM);
1961
1962         req_capsule_set_size(&req->rq_pill, &RMF_MDS_HSM_USER_ITEM, RCL_CLIENT,
1963                              hur->hur_request.hr_itemcount
1964                              * sizeof(struct hsm_user_item));
1965         req_capsule_set_size(&req->rq_pill, &RMF_GENERIC_DATA, RCL_CLIENT,
1966                              hur->hur_request.hr_data_len);
1967
1968         rc = ptlrpc_request_pack(req, LUSTRE_MDS_VERSION, MDS_HSM_REQUEST);
1969         if (rc) {
1970                 ptlrpc_request_free(req);
1971                 RETURN(rc);
1972         }
1973
1974         mdc_pack_body(&req->rq_pill, NULL, 0, 0, -1, 0);
1975
1976         /* Copy hsm_request struct */
1977         req_hr = req_capsule_client_get(&req->rq_pill, &RMF_MDS_HSM_REQUEST);
1978         if (req_hr == NULL)
1979                 GOTO(out, rc = -EPROTO);
1980         *req_hr = hur->hur_request;
1981
1982         /* Copy hsm_user_item structs */
1983         req_hui = req_capsule_client_get(&req->rq_pill, &RMF_MDS_HSM_USER_ITEM);
1984         if (req_hui == NULL)
1985                 GOTO(out, rc = -EPROTO);
1986         memcpy(req_hui, hur->hur_user_item,
1987                hur->hur_request.hr_itemcount * sizeof(struct hsm_user_item));
1988
1989         /* Copy opaque field */
1990         req_opaque = req_capsule_client_get(&req->rq_pill, &RMF_GENERIC_DATA);
1991         if (req_opaque == NULL)
1992                 GOTO(out, rc = -EPROTO);
1993         memcpy(req_opaque, hur_data(hur), hur->hur_request.hr_data_len);
1994
1995         ptlrpc_request_set_replen(req);
1996
1997         ptlrpc_get_mod_rpc_slot(req);
1998         rc = ptlrpc_queue_wait(req);
1999         ptlrpc_put_mod_rpc_slot(req);
2000
2001         GOTO(out, rc);
2002
2003 out:
2004         ptlrpc_req_finished(req);
2005         return rc;
2006 }
2007
2008 static int mdc_ioc_hsm_ct_start(struct obd_export *exp,
2009                                 struct lustre_kernelcomm *lk);
2010
2011 static int mdc_quotactl(struct obd_device *unused, struct obd_export *exp,
2012                         struct obd_quotactl *oqctl)
2013 {
2014         struct ptlrpc_request *req;
2015         struct obd_quotactl *oqc;
2016         int rc;
2017         ENTRY;
2018
2019         req = ptlrpc_request_alloc(class_exp2cliimp(exp), &RQF_MDS_QUOTACTL);
2020         if (req == NULL)
2021                 RETURN(-ENOMEM);
2022
2023
2024         if (LUSTRE_Q_CMD_IS_POOL(oqctl->qc_cmd))
2025                 req_capsule_set_size(&req->rq_pill,
2026                                      &RMF_OBD_QUOTACTL,
2027                                      RCL_CLIENT,
2028                                      sizeof(*oqc) + LOV_MAXPOOLNAME + 1);
2029
2030         rc = ptlrpc_request_pack(req, LUSTRE_MDS_VERSION,
2031                                  MDS_QUOTACTL);
2032         if (rc) {
2033                 ptlrpc_request_free(req);
2034                 RETURN(rc);
2035         }
2036
2037         oqc = req_capsule_client_get(&req->rq_pill, &RMF_OBD_QUOTACTL);
2038         QCTL_COPY(oqc, oqctl);
2039
2040         ptlrpc_request_set_replen(req);
2041         ptlrpc_at_set_req_timeout(req);
2042
2043         rc = ptlrpc_queue_wait(req);
2044         if (rc) {
2045                 CERROR("%s: ptlrpc_queue_wait failed: rc = %d\n",
2046                        exp->exp_obd->obd_name, rc);
2047                 GOTO(out, rc);
2048         }
2049
2050         if (req->rq_repmsg &&
2051             (oqc = req_capsule_server_get(&req->rq_pill, &RMF_OBD_QUOTACTL))) {
2052                 QCTL_COPY(oqctl, oqc);
2053         } else if (!rc) {
2054                 rc = -EPROTO;
2055                 CERROR("%s: cannot unpack obd_quotactl: rc = %d\n",
2056                         exp->exp_obd->obd_name, rc);
2057         }
2058 out:
2059         ptlrpc_req_finished(req);
2060
2061         RETURN(rc);
2062 }
2063
2064 static int mdc_ioc_swap_layouts(struct obd_export *exp,
2065                                 struct md_op_data *op_data)
2066 {
2067         LIST_HEAD(cancels);
2068         struct ptlrpc_request   *req;
2069         int                      rc, count;
2070         struct mdc_swap_layouts *msl, *payload;
2071         ENTRY;
2072
2073         msl = op_data->op_data;
2074
2075         /* When the MDT will get the MDS_SWAP_LAYOUTS RPC the
2076          * first thing it will do is to cancel the 2 layout
2077          * locks held by this client.
2078          * So the client must cancel its layout locks on the 2 fids
2079          * with the request RPC to avoid extra RPC round trips.
2080          */
2081         count = mdc_resource_get_unused(exp, &op_data->op_fid1, &cancels,
2082                                         LCK_EX, MDS_INODELOCK_LAYOUT |
2083                                         MDS_INODELOCK_XATTR);
2084         count += mdc_resource_get_unused(exp, &op_data->op_fid2, &cancels,
2085                                          LCK_EX, MDS_INODELOCK_LAYOUT |
2086                                          MDS_INODELOCK_XATTR);
2087
2088         req = ptlrpc_request_alloc(class_exp2cliimp(exp),
2089                                    &RQF_MDS_SWAP_LAYOUTS);
2090         if (req == NULL) {
2091                 ldlm_lock_list_put(&cancels, l_bl_ast, count);
2092                 RETURN(-ENOMEM);
2093         }
2094
2095         rc = mdc_prep_elc_req(exp, req, MDS_SWAP_LAYOUTS, &cancels, count);
2096         if (rc) {
2097                 ptlrpc_request_free(req);
2098                 RETURN(rc);
2099         }
2100
2101         mdc_swap_layouts_pack(&req->rq_pill, op_data);
2102
2103         payload = req_capsule_client_get(&req->rq_pill, &RMF_SWAP_LAYOUTS);
2104         LASSERT(payload);
2105
2106         *payload = *msl;
2107
2108         ptlrpc_request_set_replen(req);
2109
2110         rc = ptlrpc_queue_wait(req);
2111         if (rc)
2112                 GOTO(out, rc);
2113         EXIT;
2114
2115 out:
2116         ptlrpc_req_finished(req);
2117         return rc;
2118 }
2119
2120 static int mdc_iocontrol(unsigned int cmd, struct obd_export *exp, int len,
2121                          void *karg, void __user *uarg)
2122 {
2123         struct obd_device *obd = exp->exp_obd;
2124         struct obd_ioctl_data *data = karg;
2125         struct obd_import *imp = obd->u.cli.cl_import;
2126         int rc;
2127         ENTRY;
2128
2129         if (!try_module_get(THIS_MODULE)) {
2130                 CERROR("%s: cannot get module '%s'\n", obd->obd_name,
2131                        module_name(THIS_MODULE));
2132                 return -EINVAL;
2133         }
2134         switch (cmd) {
2135         case OBD_IOC_FID2PATH:
2136                 rc = mdc_ioc_fid2path(exp, karg);
2137                 GOTO(out, rc);
2138         case LL_IOC_HSM_CT_START:
2139                 rc = mdc_ioc_hsm_ct_start(exp, karg);
2140                 /* ignore if it was already registered on this MDS. */
2141                 if (rc == -EEXIST)
2142                         rc = 0;
2143                 GOTO(out, rc);
2144         case LL_IOC_HSM_PROGRESS:
2145                 rc = mdc_ioc_hsm_progress(exp, karg);
2146                 GOTO(out, rc);
2147         case LL_IOC_HSM_STATE_GET:
2148                 rc = mdc_ioc_hsm_state_get(exp, karg);
2149                 GOTO(out, rc);
2150         case LL_IOC_HSM_STATE_SET:
2151                 rc = mdc_ioc_hsm_state_set(exp, karg);
2152                 GOTO(out, rc);
2153         case LL_IOC_HSM_ACTION:
2154                 rc = mdc_ioc_hsm_current_action(exp, karg);
2155                 GOTO(out, rc);
2156         case LL_IOC_HSM_REQUEST:
2157                 rc = mdc_ioc_hsm_request(exp, karg);
2158                 GOTO(out, rc);
2159         case OBD_IOC_CLIENT_RECOVER:
2160                 rc = ptlrpc_recover_import(imp, data->ioc_inlbuf1, 0);
2161                 if (rc < 0)
2162                         GOTO(out, rc);
2163                 GOTO(out, rc = 0);
2164         case IOC_OSC_SET_ACTIVE:
2165                 rc = ptlrpc_set_import_active(imp, data->ioc_offset);
2166                 GOTO(out, rc);
2167         /*
2168          * Normally IOC_OBD_STATFS, OBD_IOC_QUOTACTL iocontrol are handled by
2169          * LMV instead of MDC. But when the cluster is upgraded from 1.8,
2170          * there'd be no LMV layer thus we might be called here. Eventually
2171          * this code should be removed.
2172          * bz20731, LU-592.
2173          */
2174         case IOC_OBD_STATFS: {
2175                 struct obd_statfs stat_buf = {0};
2176
2177                 if (*((__u32 *) data->ioc_inlbuf2) != 0)
2178                         GOTO(out, rc = -ENODEV);
2179
2180                 /* copy UUID */
2181                 if (copy_to_user(data->ioc_pbuf2, obd2cli_tgt(obd),
2182                                  min((int)data->ioc_plen2,
2183                                      (int)sizeof(struct obd_uuid))))
2184                         GOTO(out, rc = -EFAULT);
2185
2186                 rc = mdc_statfs(NULL, obd->obd_self_export, &stat_buf,
2187                                 ktime_get_seconds() - OBD_STATFS_CACHE_SECONDS,
2188                                 0);
2189                 if (rc != 0)
2190                         GOTO(out, rc);
2191
2192                 if (copy_to_user(data->ioc_pbuf1, &stat_buf,
2193                                      min((int) data->ioc_plen1,
2194                                          (int) sizeof(stat_buf))))
2195                         GOTO(out, rc = -EFAULT);
2196
2197                 GOTO(out, rc = 0);
2198         }
2199         case OBD_IOC_QUOTACTL: {
2200                 struct if_quotactl *qctl = karg;
2201                 struct obd_quotactl *oqctl;
2202
2203                 OBD_ALLOC_PTR(oqctl);
2204                 if (oqctl == NULL)
2205                         GOTO(out, rc = -ENOMEM);
2206
2207                 QCTL_COPY(oqctl, qctl);
2208                 rc = obd_quotactl(exp, oqctl);
2209                 if (rc == 0) {
2210                         QCTL_COPY(qctl, oqctl);
2211                         qctl->qc_valid = QC_MDTIDX;
2212                         qctl->obd_uuid = obd->u.cli.cl_target_uuid;
2213                 }
2214
2215                 OBD_FREE_PTR(oqctl);
2216                 GOTO(out, rc);
2217         }
2218         case LL_IOC_GET_CONNECT_FLAGS:
2219                 if (copy_to_user(uarg, exp_connect_flags_ptr(exp),
2220                                  sizeof(*exp_connect_flags_ptr(exp))))
2221                         GOTO(out, rc = -EFAULT);
2222
2223                 GOTO(out, rc = 0);
2224         case LL_IOC_LOV_SWAP_LAYOUTS:
2225                 rc = mdc_ioc_swap_layouts(exp, karg);
2226                 GOTO(out, rc);
2227         default:
2228                 CERROR("unrecognised ioctl: cmd = %#x\n", cmd);
2229                 GOTO(out, rc = -ENOTTY);
2230         }
2231 out:
2232         module_put(THIS_MODULE);
2233
2234         return rc;
2235 }
2236
2237 static int mdc_get_info_rpc(struct obd_export *exp,
2238                             u32 keylen, void *key,
2239                             u32 vallen, void *val)
2240 {
2241         struct obd_import      *imp = class_exp2cliimp(exp);
2242         struct ptlrpc_request  *req;
2243         char                   *tmp;
2244         int                     rc = -EINVAL;
2245         ENTRY;
2246
2247         req = ptlrpc_request_alloc(imp, &RQF_MDS_GET_INFO);
2248         if (req == NULL)
2249                 RETURN(-ENOMEM);
2250
2251         req_capsule_set_size(&req->rq_pill, &RMF_GETINFO_KEY,
2252                              RCL_CLIENT, keylen);
2253         req_capsule_set_size(&req->rq_pill, &RMF_GETINFO_VALLEN,
2254                              RCL_CLIENT, sizeof(vallen));
2255
2256         rc = ptlrpc_request_pack(req, LUSTRE_MDS_VERSION, MDS_GET_INFO);
2257         if (rc) {
2258                 ptlrpc_request_free(req);
2259                 RETURN(rc);
2260         }
2261
2262         tmp = req_capsule_client_get(&req->rq_pill, &RMF_GETINFO_KEY);
2263         memcpy(tmp, key, keylen);
2264         tmp = req_capsule_client_get(&req->rq_pill, &RMF_GETINFO_VALLEN);
2265         memcpy(tmp, &vallen, sizeof(vallen));
2266
2267         req_capsule_set_size(&req->rq_pill, &RMF_GETINFO_VAL,
2268                              RCL_SERVER, vallen);
2269         ptlrpc_request_set_replen(req);
2270
2271         /* if server failed to resolve FID, and OI scrub not able to fix it, it
2272          * will return -EINPROGRESS, ptlrpc_queue_wait() will keep retrying,
2273          * set request interruptible to avoid deadlock.
2274          */
2275         if (KEY_IS(KEY_FID2PATH))
2276                 req->rq_allow_intr = 1;
2277
2278         rc = ptlrpc_queue_wait(req);
2279         /* -EREMOTE means the get_info result is partial, and it needs to
2280          * continue on another MDT, see fid2path part in lmv_iocontrol */
2281         if (rc == 0 || rc == -EREMOTE) {
2282                 tmp = req_capsule_server_get(&req->rq_pill, &RMF_GETINFO_VAL);
2283                 memcpy(val, tmp, vallen);
2284                 if (req_capsule_rep_need_swab(&req->rq_pill)) {
2285                         if (KEY_IS(KEY_FID2PATH))
2286                                 lustre_swab_fid2path(val);
2287                 }
2288         }
2289         ptlrpc_req_finished(req);
2290
2291         RETURN(rc);
2292 }
2293
2294 static void lustre_swab_hai(struct hsm_action_item *h)
2295 {
2296         __swab32s(&h->hai_len);
2297         __swab32s(&h->hai_action);
2298         lustre_swab_lu_fid(&h->hai_fid);
2299         lustre_swab_lu_fid(&h->hai_dfid);
2300         __swab64s(&h->hai_cookie);
2301         __swab64s(&h->hai_extent.offset);
2302         __swab64s(&h->hai_extent.length);
2303         __swab64s(&h->hai_gid);
2304 }
2305
2306 static void lustre_swab_hal(struct hsm_action_list *h)
2307 {
2308         struct hsm_action_item  *hai;
2309         __u32                    i;
2310
2311         __swab32s(&h->hal_version);
2312         __swab32s(&h->hal_count);
2313         __swab32s(&h->hal_archive_id);
2314         __swab64s(&h->hal_flags);
2315         hai = hai_first(h);
2316         for (i = 0; i < h->hal_count; i++, hai = hai_next(hai))
2317                 lustre_swab_hai(hai);
2318 }
2319
2320 static void lustre_swab_kuch(struct kuc_hdr *l)
2321 {
2322         __swab16s(&l->kuc_magic);
2323         /* __u8 l->kuc_transport */
2324         __swab16s(&l->kuc_msgtype);
2325         __swab16s(&l->kuc_msglen);
2326 }
2327
2328 static int mdc_ioc_hsm_ct_start(struct obd_export *exp,
2329                                 struct lustre_kernelcomm *lk)
2330 {
2331         struct obd_import *imp = class_exp2cliimp(exp);
2332         int rc = 0;
2333
2334         if (lk->lk_group != KUC_GRP_HSM) {
2335                 CERROR("Bad copytool group %d\n", lk->lk_group);
2336                 return -EINVAL;
2337         }
2338
2339         CDEBUG(D_HSM, "CT start r%d w%d u%d g%d f%#x\n", lk->lk_rfd, lk->lk_wfd,
2340                lk->lk_uid, lk->lk_group, lk->lk_flags);
2341
2342         if (lk->lk_flags & LK_FLG_STOP) {
2343                 /* Unregister with the coordinator */
2344                 rc = mdc_ioc_hsm_ct_unregister(imp);
2345         } else {
2346                 __u32 *archives = NULL;
2347
2348                 if ((lk->lk_flags & LK_FLG_DATANR) && lk->lk_data_count > 0)
2349                         archives = lk->lk_data;
2350
2351                 rc = mdc_ioc_hsm_ct_register(imp, lk->lk_data_count, archives);
2352         }
2353
2354         return rc;
2355 }
2356
2357 /**
2358  * Send a message to any listening copytools
2359  * @param val KUC message (kuc_hdr + hsm_action_list)
2360  * @param len total length of message
2361  */
2362 static int mdc_hsm_copytool_send(const struct obd_uuid *uuid,
2363                                  size_t len, void *val)
2364 {
2365         struct kuc_hdr          *lh = (struct kuc_hdr *)val;
2366         struct hsm_action_list  *hal = (struct hsm_action_list *)(lh + 1);
2367         int                      rc;
2368         ENTRY;
2369
2370         if (len < sizeof(*lh) + sizeof(*hal)) {
2371                 CERROR("Short HSM message %zu < %zu\n", len,
2372                        sizeof(*lh) + sizeof(*hal));
2373                 RETURN(-EPROTO);
2374         }
2375         if (lh->kuc_magic == __swab16(KUC_MAGIC)) {
2376                 lustre_swab_kuch(lh);
2377                 lustre_swab_hal(hal);
2378         } else if (lh->kuc_magic != KUC_MAGIC) {
2379                 CERROR("Bad magic %x!=%x\n", lh->kuc_magic, KUC_MAGIC);
2380                 RETURN(-EPROTO);
2381         }
2382
2383         CDEBUG(D_HSM, " Received message mg=%x t=%d m=%d l=%d actions=%d "
2384                "on %s\n",
2385                lh->kuc_magic, lh->kuc_transport, lh->kuc_msgtype,
2386                lh->kuc_msglen, hal->hal_count, hal->hal_fsname);
2387
2388         /* Broadcast to HSM listeners */
2389         rc = libcfs_kkuc_group_put(uuid, KUC_GRP_HSM, lh);
2390
2391         RETURN(rc);
2392 }
2393
2394 /**
2395  * callback function passed to kuc for re-registering each HSM copytool
2396  * running on MDC, after MDT shutdown/recovery.
2397  * @param data copytool registration data
2398  * @param cb_arg callback argument (obd_import)
2399  */
2400 static int mdc_hsm_ct_reregister(void *data, void *cb_arg)
2401 {
2402         struct obd_import *imp = (struct obd_import *)cb_arg;
2403         struct kkuc_ct_data *kcd = data;
2404         __u32 *archives = NULL;
2405         int rc;
2406
2407         if (kcd == NULL ||
2408             (kcd->kcd_magic != KKUC_CT_DATA_ARRAY_MAGIC &&
2409              kcd->kcd_magic != KKUC_CT_DATA_BITMAP_MAGIC))
2410                 return -EPROTO;
2411
2412         if (kcd->kcd_magic == KKUC_CT_DATA_BITMAP_MAGIC) {
2413                 CDEBUG(D_HA, "%s: recover copytool registration to MDT "
2414                        "(archive=%#x)\n", imp->imp_obd->obd_name,
2415                        kcd->kcd_nr_archives);
2416         } else {
2417                 CDEBUG(D_HA, "%s: recover copytool registration to MDT "
2418                        "(archive nr = %u)\n",
2419                        imp->imp_obd->obd_name, kcd->kcd_nr_archives);
2420                 if (kcd->kcd_nr_archives != 0)
2421                         archives = kcd->kcd_archives;
2422         }
2423
2424         rc = mdc_ioc_hsm_ct_register(imp, kcd->kcd_nr_archives, archives);
2425         /* ignore error if the copytool is already registered */
2426         return (rc == -EEXIST) ? 0 : rc;
2427 }
2428
2429 /**
2430  * Re-establish all kuc contexts with MDT
2431  * after MDT shutdown/recovery.
2432  */
2433 static int mdc_kuc_reregister(struct obd_import *imp)
2434 {
2435         /* re-register HSM agents */
2436         return libcfs_kkuc_group_foreach(&imp->imp_obd->obd_uuid, KUC_GRP_HSM,
2437                                          mdc_hsm_ct_reregister, imp);
2438 }
2439
2440 static int mdc_set_info_async(const struct lu_env *env,
2441                               struct obd_export *exp,
2442                               u32 keylen, void *key,
2443                               u32 vallen, void *val,
2444                               struct ptlrpc_request_set *set)
2445 {
2446         struct obd_import       *imp = class_exp2cliimp(exp);
2447         int                      rc;
2448         ENTRY;
2449
2450         if (KEY_IS(KEY_READ_ONLY)) {
2451                 if (vallen != sizeof(int))
2452                         RETURN(-EINVAL);
2453
2454                 spin_lock(&imp->imp_lock);
2455                 if (*((int *)val)) {
2456                         imp->imp_connect_flags_orig |= OBD_CONNECT_RDONLY;
2457                         imp->imp_connect_data.ocd_connect_flags |=
2458                                                         OBD_CONNECT_RDONLY;
2459                 } else {
2460                         imp->imp_connect_flags_orig &= ~OBD_CONNECT_RDONLY;
2461                         imp->imp_connect_data.ocd_connect_flags &=
2462                                                         ~OBD_CONNECT_RDONLY;
2463                 }
2464                 spin_unlock(&imp->imp_lock);
2465
2466                 rc = do_set_info_async(imp, MDS_SET_INFO, LUSTRE_MDS_VERSION,
2467                                        keylen, key, vallen, val, set);
2468                 RETURN(rc);
2469         }
2470         if (KEY_IS(KEY_CHANGELOG_CLEAR)) {
2471                 rc = do_set_info_async(imp, MDS_SET_INFO, LUSTRE_MDS_VERSION,
2472                                        keylen, key, vallen, val, set);
2473                 RETURN(rc);
2474         }
2475         if (KEY_IS(KEY_HSM_COPYTOOL_SEND)) {
2476                 rc = mdc_hsm_copytool_send(&imp->imp_obd->obd_uuid, vallen,
2477                                            val);
2478                 RETURN(rc);
2479         }
2480
2481         if (KEY_IS(KEY_DEFAULT_EASIZE)) {
2482                 __u32 *default_easize = val;
2483
2484                 exp->exp_obd->u.cli.cl_default_mds_easize = *default_easize;
2485                 RETURN(0);
2486         }
2487
2488         rc = osc_set_info_async(env, exp, keylen, key, vallen, val, set);
2489         RETURN(rc);
2490 }
2491
2492 static int mdc_get_info(const struct lu_env *env, struct obd_export *exp,
2493                         __u32 keylen, void *key, __u32 *vallen, void *val)
2494 {
2495         int rc = -EINVAL;
2496
2497         if (KEY_IS(KEY_MAX_EASIZE)) {
2498                 __u32 mdsize, *max_easize;
2499
2500                 if (*vallen != sizeof(int))
2501                         RETURN(-EINVAL);
2502                 mdsize = *(__u32 *)val;
2503                 if (mdsize > exp->exp_obd->u.cli.cl_max_mds_easize)
2504                         exp->exp_obd->u.cli.cl_max_mds_easize = mdsize;
2505                 max_easize = val;
2506                 *max_easize = exp->exp_obd->u.cli.cl_max_mds_easize;
2507                 RETURN(0);
2508         } else if (KEY_IS(KEY_DEFAULT_EASIZE)) {
2509                 __u32 *default_easize;
2510
2511                 if (*vallen != sizeof(int))
2512                         RETURN(-EINVAL);
2513                 default_easize = val;
2514                 *default_easize = exp->exp_obd->u.cli.cl_default_mds_easize;
2515                 RETURN(0);
2516         } else if (KEY_IS(KEY_CONN_DATA)) {
2517                 struct obd_import *imp = class_exp2cliimp(exp);
2518                 struct obd_connect_data *data = val;
2519
2520                 if (*vallen != sizeof(*data))
2521                         RETURN(-EINVAL);
2522
2523                 *data = imp->imp_connect_data;
2524                 RETURN(0);
2525         } else if (KEY_IS(KEY_TGT_COUNT)) {
2526                 *((__u32 *)val) = 1;
2527                 RETURN(0);
2528         }
2529
2530         rc = mdc_get_info_rpc(exp, keylen, key, *vallen, val);
2531
2532         RETURN(rc);
2533 }
2534
2535 static int mdc_fsync(struct obd_export *exp, const struct lu_fid *fid,
2536                      struct ptlrpc_request **request)
2537 {
2538         struct ptlrpc_request *req;
2539         int                    rc;
2540         ENTRY;
2541
2542         *request = NULL;
2543         req = ptlrpc_request_alloc(class_exp2cliimp(exp), &RQF_MDS_SYNC);
2544         if (req == NULL)
2545                 RETURN(-ENOMEM);
2546
2547         rc = ptlrpc_request_pack(req, LUSTRE_MDS_VERSION, MDS_SYNC);
2548         if (rc) {
2549                 ptlrpc_request_free(req);
2550                 RETURN(rc);
2551         }
2552
2553         mdc_pack_body(&req->rq_pill, fid, 0, 0, -1, 0);
2554
2555         ptlrpc_request_set_replen(req);
2556
2557         rc = ptlrpc_queue_wait(req);
2558         if (rc)
2559                 ptlrpc_req_finished(req);
2560         else
2561                 *request = req;
2562         RETURN(rc);
2563 }
2564
2565 struct mdc_rmfid_args {
2566         int *mra_rcs;
2567         int mra_nr;
2568 };
2569
2570 int mdc_rmfid_interpret(const struct lu_env *env, struct ptlrpc_request *req,
2571                           void *args, int rc)
2572 {
2573         struct mdc_rmfid_args *aa;
2574         int *rcs, size;
2575         ENTRY;
2576
2577         if (!rc) {
2578                 aa = ptlrpc_req_async_args(aa, req);
2579
2580                 size = req_capsule_get_size(&req->rq_pill, &RMF_RCS,
2581                                             RCL_SERVER);
2582                 LASSERT(size == sizeof(int) * aa->mra_nr);
2583                 rcs = req_capsule_server_get(&req->rq_pill, &RMF_RCS);
2584                 LASSERT(rcs);
2585                 LASSERT(aa->mra_rcs);
2586                 LASSERT(aa->mra_nr);
2587                 memcpy(aa->mra_rcs, rcs, size);
2588         }
2589
2590         RETURN(rc);
2591 }
2592
2593 static int mdc_rmfid(struct obd_export *exp, struct fid_array *fa,
2594                      int *rcs, struct ptlrpc_request_set *set)
2595 {
2596         struct ptlrpc_request *req;
2597         struct mdc_rmfid_args *aa;
2598         struct mdt_body *b;
2599         struct lu_fid *tmp;
2600         int rc, flen;
2601         ENTRY;
2602
2603         req = ptlrpc_request_alloc(class_exp2cliimp(exp), &RQF_MDS_RMFID);
2604         if (req == NULL)
2605                 RETURN(-ENOMEM);
2606
2607         flen = fa->fa_nr * sizeof(struct lu_fid);
2608         req_capsule_set_size(&req->rq_pill, &RMF_FID_ARRAY,
2609                              RCL_CLIENT, flen);
2610         req_capsule_set_size(&req->rq_pill, &RMF_FID_ARRAY,
2611                              RCL_SERVER, flen);
2612         req_capsule_set_size(&req->rq_pill, &RMF_RCS,
2613                              RCL_SERVER, fa->fa_nr * sizeof(__u32));
2614         rc = ptlrpc_request_pack(req, LUSTRE_MDS_VERSION, MDS_RMFID);
2615         if (rc) {
2616                 ptlrpc_request_free(req);
2617                 RETURN(rc);
2618         }
2619         tmp = req_capsule_client_get(&req->rq_pill, &RMF_FID_ARRAY);
2620         memcpy(tmp, fa->fa_fids, flen);
2621
2622         mdc_pack_body(&req->rq_pill, NULL, 0, 0, -1, 0);
2623         b = req_capsule_client_get(&req->rq_pill, &RMF_MDT_BODY);
2624         b->mbo_ctime = ktime_get_real_seconds();
2625
2626         ptlrpc_request_set_replen(req);
2627
2628         LASSERT(rcs);
2629         aa = ptlrpc_req_async_args(aa, req);
2630         aa->mra_rcs = rcs;
2631         aa->mra_nr = fa->fa_nr;
2632         req->rq_interpret_reply = mdc_rmfid_interpret;
2633
2634         ptlrpc_set_add_req(set, req);
2635         ptlrpc_check_set(NULL, set);
2636
2637         RETURN(rc);
2638 }
2639
2640 static int mdc_import_event(struct obd_device *obd, struct obd_import *imp,
2641                             enum obd_import_event event)
2642 {
2643         struct client_obd *cli = &obd->u.cli;
2644         int rc = 0;
2645
2646         LASSERT(imp->imp_obd == obd);
2647
2648         switch (event) {
2649         case IMP_EVENT_DISCON:
2650                 spin_lock(&cli->cl_loi_list_lock);
2651                 cli->cl_avail_grant = 0;
2652                 cli->cl_lost_grant = 0;
2653                 spin_unlock(&cli->cl_loi_list_lock);
2654                 break;
2655         case IMP_EVENT_INACTIVE:
2656                 /*
2657                  * Flush current sequence to make client obtain new one
2658                  * from server in case of disconnect/reconnect.
2659                  */
2660                 down_read(&cli->cl_seq_rwsem);
2661                 if (cli->cl_seq)
2662                         seq_client_flush(cli->cl_seq);
2663                 up_read(&cli->cl_seq_rwsem);
2664
2665                 rc = obd_notify_observer(obd, obd, OBD_NOTIFY_INACTIVE);
2666                 break;
2667         case IMP_EVENT_INVALIDATE: {
2668                 struct ldlm_namespace *ns = obd->obd_namespace;
2669                 struct lu_env *env;
2670                 __u16 refcheck;
2671
2672                 ldlm_namespace_cleanup(ns, LDLM_FL_LOCAL_ONLY);
2673
2674                 env = cl_env_get(&refcheck);
2675                 if (!IS_ERR(env)) {
2676                         /* Reset grants. All pages go to failing rpcs due to
2677                          * the invalid import.
2678                          */
2679                         osc_io_unplug(env, cli, NULL);
2680
2681                         cfs_hash_for_each_nolock(ns->ns_rs_hash,
2682                                                  osc_ldlm_resource_invalidate,
2683                                                  env, 0);
2684                         cl_env_put(env, &refcheck);
2685                         ldlm_namespace_cleanup(ns, LDLM_FL_LOCAL_ONLY);
2686                 } else {
2687                         rc = PTR_ERR(env);
2688                 }
2689                 break;
2690         }
2691         case IMP_EVENT_ACTIVE:
2692                 rc = obd_notify_observer(obd, obd, OBD_NOTIFY_ACTIVE);
2693                 /* redo the kuc registration after reconnecting */
2694                 if (rc == 0)
2695                         rc = mdc_kuc_reregister(imp);
2696                 break;
2697         case IMP_EVENT_OCD: {
2698                 struct obd_connect_data *ocd = &imp->imp_connect_data;
2699
2700                 if (OCD_HAS_FLAG(ocd, GRANT))
2701                         osc_init_grant(cli, ocd);
2702
2703                 rc = obd_notify_observer(obd, obd, OBD_NOTIFY_OCD);
2704                 break;
2705         }
2706         case IMP_EVENT_DEACTIVATE:
2707         case IMP_EVENT_ACTIVATE:
2708                 break;
2709         default:
2710                 CERROR("Unknown import event %x\n", event);
2711                 LBUG();
2712         }
2713         RETURN(rc);
2714 }
2715
2716 int mdc_fid_alloc(const struct lu_env *env, struct obd_export *exp,
2717                   struct lu_fid *fid, struct md_op_data *op_data)
2718 {
2719         struct client_obd *cli = &exp->exp_obd->u.cli;
2720         int rc = -EIO;
2721
2722         ENTRY;
2723
2724         down_read(&cli->cl_seq_rwsem);
2725         if (cli->cl_seq)
2726                 rc = seq_client_alloc_fid(env, cli->cl_seq, fid);
2727         up_read(&cli->cl_seq_rwsem);
2728
2729         RETURN(rc);
2730 }
2731
2732 static struct obd_uuid *mdc_get_uuid(struct obd_export *exp)
2733 {
2734         struct client_obd *cli = &exp->exp_obd->u.cli;
2735         return &cli->cl_target_uuid;
2736 }
2737
2738 /**
2739  * Determine whether the lock can be canceled before replaying it during
2740  * recovery, non zero value will be return if the lock can be canceled,
2741  * or zero returned for not
2742  */
2743 static int mdc_cancel_weight(struct ldlm_lock *lock)
2744 {
2745         if (lock->l_resource->lr_type != LDLM_IBITS)
2746                 RETURN(0);
2747
2748         /* FIXME: if we ever get into a situation where there are too many
2749          * opened files with open locks on a single node, then we really
2750          * should replay these open locks to reget it */
2751         if (lock->l_policy_data.l_inodebits.bits & MDS_INODELOCK_OPEN)
2752                 RETURN(0);
2753
2754         /* Special case for DoM locks, cancel only unused and granted locks */
2755         if (ldlm_has_dom(lock) &&
2756             (lock->l_granted_mode != lock->l_req_mode ||
2757              osc_ldlm_weigh_ast(lock) != 0))
2758                 RETURN(0);
2759
2760         RETURN(1);
2761 }
2762
2763 static int mdc_resource_inode_free(struct ldlm_resource *res)
2764 {
2765         if (res->lr_lvb_inode)
2766                 res->lr_lvb_inode = NULL;
2767
2768         return 0;
2769 }
2770
2771 static struct ldlm_valblock_ops inode_lvbo = {
2772         .lvbo_free = mdc_resource_inode_free
2773 };
2774
2775 static int mdc_llog_init(struct obd_device *obd)
2776 {
2777         struct obd_llog_group   *olg = &obd->obd_olg;
2778         struct llog_ctxt        *ctxt;
2779         int                      rc;
2780
2781         ENTRY;
2782
2783         rc = llog_setup(NULL, obd, olg, LLOG_CHANGELOG_REPL_CTXT, obd,
2784                         &llog_client_ops);
2785         if (rc < 0)
2786                 RETURN(rc);
2787
2788         ctxt = llog_group_get_ctxt(olg, LLOG_CHANGELOG_REPL_CTXT);
2789         llog_initiator_connect(ctxt);
2790         llog_ctxt_put(ctxt);
2791
2792         RETURN(0);
2793 }
2794
2795 static void mdc_llog_finish(struct obd_device *obd)
2796 {
2797         struct llog_ctxt *ctxt;
2798
2799         ENTRY;
2800
2801         ctxt = llog_get_context(obd, LLOG_CHANGELOG_REPL_CTXT);
2802         if (ctxt != NULL)
2803                 llog_cleanup(NULL, ctxt);
2804
2805         EXIT;
2806 }
2807
2808 int mdc_setup(struct obd_device *obd, struct lustre_cfg *cfg)
2809 {
2810         int rc;
2811
2812         ENTRY;
2813
2814         rc = osc_setup_common(obd, cfg);
2815         if (rc < 0)
2816                 RETURN(rc);
2817
2818         rc = mdc_tunables_init(obd);
2819         if (rc)
2820                 GOTO(err_osc_cleanup, rc);
2821
2822         obd->u.cli.cl_dom_min_inline_repsize = MDC_DOM_DEF_INLINE_REPSIZE;
2823
2824         ns_register_cancel(obd->obd_namespace, mdc_cancel_weight);
2825
2826         obd->obd_namespace->ns_lvbo = &inode_lvbo;
2827
2828         rc = mdc_llog_init(obd);
2829         if (rc) {
2830                 CERROR("%s: failed to setup llogging subsystems: rc = %d\n",
2831                        obd->obd_name, rc);
2832                 GOTO(err_llog_cleanup, rc);
2833         }
2834
2835         rc = mdc_changelog_cdev_init(obd);
2836         if (rc) {
2837                 CERROR("%s: failed to setup changelog char device: rc = %d\n",
2838                        obd->obd_name, rc);
2839                 GOTO(err_changelog_cleanup, rc);
2840         }
2841
2842         RETURN(rc);
2843
2844 err_changelog_cleanup:
2845         mdc_llog_finish(obd);
2846 err_llog_cleanup:
2847         lprocfs_free_md_stats(obd);
2848         ptlrpc_lprocfs_unregister_obd(obd);
2849 err_osc_cleanup:
2850         osc_cleanup_common(obd);
2851         return rc;
2852 }
2853
2854 /* Initialize the default and maximum LOV EA sizes.  This allows
2855  * us to make MDS RPCs with large enough reply buffers to hold a default
2856  * sized EA without having to calculate this (via a call into the
2857  * LOV + OSCs) each time we make an RPC.  The maximum size is also tracked
2858  * but not used to avoid wastefully vmalloc()'ing large reply buffers when
2859  * a large number of stripes is possible.  If a larger reply buffer is
2860  * required it will be reallocated in the ptlrpc layer due to overflow.
2861  */
2862 static int mdc_init_ea_size(struct obd_export *exp, __u32 easize,
2863                             __u32 def_easize)
2864 {
2865         struct obd_device *obd = exp->exp_obd;
2866         struct client_obd *cli = &obd->u.cli;
2867         ENTRY;
2868
2869         if (cli->cl_max_mds_easize < easize)
2870                 cli->cl_max_mds_easize = easize;
2871
2872         if (cli->cl_default_mds_easize < def_easize)
2873                 cli->cl_default_mds_easize = def_easize;
2874
2875         RETURN(0);
2876 }
2877
2878 static int mdc_precleanup(struct obd_device *obd)
2879 {
2880         ENTRY;
2881
2882         osc_precleanup_common(obd);
2883         mdc_changelog_cdev_finish(obd);
2884
2885         obd_cleanup_client_import(obd);
2886         ptlrpc_lprocfs_unregister_obd(obd);
2887         lprocfs_free_md_stats(obd);
2888         mdc_llog_finish(obd);
2889         RETURN(0);
2890 }
2891
2892 static int mdc_cleanup(struct obd_device *obd)
2893 {
2894         return osc_cleanup_common(obd);
2895 }
2896
2897 static const struct obd_ops mdc_obd_ops = {
2898         .o_owner            = THIS_MODULE,
2899         .o_setup            = mdc_setup,
2900         .o_precleanup       = mdc_precleanup,
2901         .o_cleanup          = mdc_cleanup,
2902         .o_add_conn         = client_import_add_conn,
2903         .o_del_conn         = client_import_del_conn,
2904         .o_connect          = client_connect_import,
2905         .o_reconnect        = osc_reconnect,
2906         .o_disconnect       = osc_disconnect,
2907         .o_iocontrol        = mdc_iocontrol,
2908         .o_set_info_async   = mdc_set_info_async,
2909         .o_statfs           = mdc_statfs,
2910         .o_statfs_async     = mdc_statfs_async,
2911         .o_fid_init         = client_fid_init,
2912         .o_fid_fini         = client_fid_fini,
2913         .o_fid_alloc        = mdc_fid_alloc,
2914         .o_import_event     = mdc_import_event,
2915         .o_get_info         = mdc_get_info,
2916         .o_get_uuid         = mdc_get_uuid,
2917         .o_quotactl         = mdc_quotactl,
2918 };
2919
2920 static const struct md_ops mdc_md_ops = {
2921         .m_get_root         = mdc_get_root,
2922         .m_null_inode       = mdc_null_inode,
2923         .m_close            = mdc_close,
2924         .m_create           = mdc_create,
2925         .m_enqueue          = mdc_enqueue,
2926         .m_getattr          = mdc_getattr,
2927         .m_getattr_name     = mdc_getattr_name,
2928         .m_intent_lock      = mdc_intent_lock,
2929         .m_link             = mdc_link,
2930         .m_rename           = mdc_rename,
2931         .m_setattr          = mdc_setattr,
2932         .m_setxattr         = mdc_setxattr,
2933         .m_getxattr         = mdc_getxattr,
2934         .m_fsync                = mdc_fsync,
2935         .m_file_resync          = mdc_file_resync,
2936         .m_read_page            = mdc_read_page,
2937         .m_unlink           = mdc_unlink,
2938         .m_cancel_unused    = mdc_cancel_unused,
2939         .m_init_ea_size     = mdc_init_ea_size,
2940         .m_set_lock_data    = mdc_set_lock_data,
2941         .m_lock_match       = mdc_lock_match,
2942         .m_get_lustre_md    = mdc_get_lustre_md,
2943         .m_free_lustre_md   = mdc_free_lustre_md,
2944         .m_set_open_replay_data = mdc_set_open_replay_data,
2945         .m_clear_open_replay_data = mdc_clear_open_replay_data,
2946         .m_intent_getattr_async = mdc_intent_getattr_async,
2947         .m_revalidate_lock      = mdc_revalidate_lock,
2948         .m_rmfid                = mdc_rmfid,
2949 };
2950
2951 dev_t mdc_changelog_dev;
2952 struct class *mdc_changelog_class;
2953 static int __init mdc_init(void)
2954 {
2955         int rc = 0;
2956         rc = alloc_chrdev_region(&mdc_changelog_dev, 0,
2957                                  MDC_CHANGELOG_DEV_COUNT,
2958                                  MDC_CHANGELOG_DEV_NAME);
2959         if (rc)
2960                 return rc;
2961
2962         mdc_changelog_class = class_create(THIS_MODULE, MDC_CHANGELOG_DEV_NAME);
2963         if (IS_ERR(mdc_changelog_class)) {
2964                 rc = PTR_ERR(mdc_changelog_class);
2965                 goto out_dev;
2966         }
2967
2968         rc = class_register_type(&mdc_obd_ops, &mdc_md_ops, true,
2969                                  LUSTRE_MDC_NAME, &mdc_device_type);
2970         if (rc)
2971                 goto out_class;
2972
2973         return 0;
2974
2975 out_class:
2976         class_destroy(mdc_changelog_class);
2977 out_dev:
2978         unregister_chrdev_region(mdc_changelog_dev, MDC_CHANGELOG_DEV_COUNT);
2979         return rc;
2980 }
2981
2982 static void __exit mdc_exit(void)
2983 {
2984         class_unregister_type(LUSTRE_MDC_NAME);
2985         class_destroy(mdc_changelog_class);
2986         unregister_chrdev_region(mdc_changelog_dev, MDC_CHANGELOG_DEV_COUNT);
2987         idr_destroy(&mdc_changelog_minor_idr);
2988 }
2989
2990 MODULE_AUTHOR("OpenSFS, Inc. <http://www.lustre.org/>");
2991 MODULE_DESCRIPTION("Lustre Metadata Client");
2992 MODULE_VERSION(LUSTRE_VERSION_STRING);
2993 MODULE_LICENSE("GPL");
2994
2995 module_init(mdc_init);
2996 module_exit(mdc_exit);