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_ioctl_old.h>
  55 #include <lustre_kernelcomm.h>
  56 #include <lustre_lmv.h>
  57 #include <lustre_log.h>
  58 #include <lustre_osc.h>
  59 #include <lustre_swab.h>
  60 #include <obd_class.h>
  61
  62 #include "mdc_internal.h"
  63
  64 #define REQUEST_MINOR 244
  65
  66 static int mdc_cleanup(struct obd_device *obd);
  67
  68 static inline int mdc_queue_wait(struct ptlrpc_request *req)
  69 {
  70         struct client_obd *cli = &req->rq_import->imp_obd->u.cli;
  71         int rc;
  72
  73         /* obd_get_request_slot() ensures that this client has no more
  74          * than cl_max_rpcs_in_flight RPCs simultaneously inf light
  75          * against an MDT. */
  76         rc = obd_get_request_slot(cli);
  77         if (rc != 0)
  78                 return rc;
  79
  80         rc = ptlrpc_queue_wait(req);
  81         obd_put_request_slot(cli);
  82
  83         return rc;
  84 }
  85
  86 /*
  87  * Send MDS_GET_ROOT RPC to fetch root FID.
  88  *
  89  * If \a fileset is not NULL it should contain a subdirectory off
  90  * the ROOT/ directory to be mounted on the client. Return the FID
  91  * of the subdirectory to the client to mount onto its mountpoint.
  92  *
  93  * \param[in]   imp     MDC import
  94  * \param[in]   fileset fileset name, which could be NULL
  95  * \param[out]  rootfid root FID of this mountpoint
  96  * \param[out]  pc      root capa will be unpacked and saved in this pointer
  97  *
  98  * \retval      0 on success, negative errno on failure
  99  */
 100 static int mdc_get_root(struct obd_export *exp, const char *fileset,
 101                          struct lu_fid *rootfid)
 102 {
 103         struct ptlrpc_request   *req;
 104         struct mdt_body         *body;
 105         int                      rc;
 106
 107         ENTRY;
 108
 109         if (fileset && !(exp_connect_flags(exp) & OBD_CONNECT_SUBTREE))
 110                 RETURN(-EOPNOTSUPP);
 111
 112         req = ptlrpc_request_alloc(class_exp2cliimp(exp),
 113                                 &RQF_MDS_GET_ROOT);
 114         if (req == NULL)
 115                 RETURN(-ENOMEM);
 116
 117         if (fileset != NULL)
 118                 req_capsule_set_size(&req->rq_pill, &RMF_NAME, RCL_CLIENT,
 119                                      strlen(fileset) + 1);
 120         rc = ptlrpc_request_pack(req, LUSTRE_MDS_VERSION, MDS_GET_ROOT);
 121         if (rc) {
 122                 ptlrpc_request_free(req);
 123                 RETURN(rc);
 124         }
 125         mdc_pack_body(&req->rq_pill, NULL, 0, 0, -1, 0);
 126         if (fileset != NULL) {
 127                 char *name = req_capsule_client_get(&req->rq_pill, &RMF_NAME);
 128
 129                 memcpy(name, fileset, strlen(fileset));
 130         }
 131         lustre_msg_add_flags(req->rq_reqmsg, LUSTRE_IMP_FULL);
 132         req->rq_send_state = LUSTRE_IMP_FULL;
 133
 134         ptlrpc_request_set_replen(req);
 135
 136         rc = ptlrpc_queue_wait(req);
 137         if (rc)
 138                 GOTO(out, rc);
 139
 140         body = req_capsule_server_get(&req->rq_pill, &RMF_MDT_BODY);
 141         if (body == NULL)
 142                 GOTO(out, rc = -EPROTO);
 143
 144         *rootfid = body->mbo_fid1;
 145         CDEBUG(D_NET, "root fid="DFID", last_committed=%llu\n",
 146                PFID(rootfid), lustre_msg_get_last_committed(req->rq_repmsg));
 147         EXIT;
 148 out:
 149         ptlrpc_req_finished(req);
 150
 151         return rc;
 152 }
 153
 154 /*
 155  * This function now is known to always saying that it will receive 4 buffers
 156  * from server. Even for cases when acl_size and md_size is zero, RPC header
 157  * will contain 4 fields and RPC itself will contain zero size fields. This is
 158  * because mdt_getattr*() _always_ returns 4 fields, but if acl is not needed
 159  * and thus zero, it shrinks it, making zero size. The same story about
 160  * md_size. And this is course of problem when client waits for smaller number
 161  * of fields. This issue will be fixed later when client gets aware of RPC
 162  * layouts.  --umka
 163  */
 164 static int mdc_getattr_common(struct obd_export *exp,
 165                               struct ptlrpc_request *req,
 166                               struct md_op_data *op_data)
 167 {
 168         struct req_capsule *pill = &req->rq_pill;
 169         struct mdt_body    *body;
 170         void               *eadata;
 171         int                 rc;
 172         ENTRY;
 173
 174         /* Request message already built. */
 175         rc = ptlrpc_queue_wait(req);
 176         if (rc != 0)
 177                 RETURN(rc);
 178
 179         /* sanity check for the reply */
 180         body = req_capsule_server_get(pill, &RMF_MDT_BODY);
 181         if (body == NULL)
 182                 RETURN(-EPROTO);
 183
 184         CDEBUG(D_NET, "mode: %o\n", body->mbo_mode);
 185
 186         mdc_update_max_ea_from_body(exp, body);
 187         if (body->mbo_eadatasize != 0) {
 188                 eadata = req_capsule_server_sized_get(pill, &RMF_MDT_MD,
 189                                                       body->mbo_eadatasize);
 190                 if (eadata == NULL)
 191                         RETURN(-EPROTO);
 192         }
 193
 194         /* If encryption context was returned by MDT, put it in op_data
 195          * so that caller can set it on inode and save an extra getxattr.
 196          */
 197         if (op_data && op_data->op_valid & OBD_MD_ENCCTX &&
 198             body->mbo_valid & OBD_MD_ENCCTX) {
 199                 op_data->op_file_encctx =
 200                         req_capsule_server_get(pill, &RMF_FILE_ENCCTX);
 201                 op_data->op_file_encctx_size =
 202                         req_capsule_get_size(pill, &RMF_FILE_ENCCTX,
 203                                              RCL_SERVER);
 204         }
 205
 206         RETURN(0);
 207 }
 208
 209 static void mdc_reset_acl_req(struct ptlrpc_request *req)
 210 {
 211         spin_lock(&req->rq_early_free_lock);
 212         sptlrpc_cli_free_repbuf(req);
 213         req->rq_repbuf = NULL;
 214         req->rq_repbuf_len = 0;
 215         req->rq_repdata = NULL;
 216         req->rq_reqdata_len = 0;
 217         spin_unlock(&req->rq_early_free_lock);
 218 }
 219
 220 static int mdc_getattr(struct obd_export *exp, struct md_op_data *op_data,
 221                        struct ptlrpc_request **request)
 222 {
 223         struct ptlrpc_request *req;
 224         struct obd_device *obd = class_exp2obd(exp);
 225         struct obd_import *imp = class_exp2cliimp(exp);
 226         __u32 acl_bufsize = LUSTRE_POSIX_ACL_MAX_SIZE_OLD;
 227         int rc;
 228         ENTRY;
 229
 230         /* Single MDS without an LMV case */
 231         if (op_data->op_flags & MF_GET_MDT_IDX) {
 232                 op_data->op_mds = 0;
 233                 RETURN(0);
 234         }
 235
 236         *request = NULL;
 237         req = ptlrpc_request_alloc(imp, &RQF_MDS_GETATTR);
 238         if (req == NULL)
 239                 RETURN(-ENOMEM);
 240
 241         rc = ptlrpc_request_pack(req, LUSTRE_MDS_VERSION, MDS_GETATTR);
 242         if (rc) {
 243                 ptlrpc_request_free(req);
 244                 RETURN(rc);
 245         }
 246
 247         /* LU-15245: avoid deadlock with modifying RPCs on MDS_REQUEST_PORTAL */
 248         req->rq_request_portal = MDS_READPAGE_PORTAL;
 249
 250 again:
 251         mdc_pack_body(&req->rq_pill, &op_data->op_fid1, op_data->op_valid,
 252                       op_data->op_mode, -1, 0);
 253         req_capsule_set_size(&req->rq_pill, &RMF_ACL, RCL_SERVER, acl_bufsize);
 254         req_capsule_set_size(&req->rq_pill, &RMF_MDT_MD, RCL_SERVER,
 255                              op_data->op_mode);
 256         if (exp_connect_encrypt(exp) && op_data->op_valid & OBD_MD_ENCCTX)
 257                 req_capsule_set_size(&req->rq_pill, &RMF_FILE_ENCCTX,
 258                                      RCL_SERVER,
 259                                      obd->u.cli.cl_max_mds_easize);
 260         else
 261                 req_capsule_set_size(&req->rq_pill, &RMF_FILE_ENCCTX,
 262                                      RCL_SERVER, 0);
 263         ptlrpc_request_set_replen(req);
 264
 265         rc = mdc_getattr_common(exp, req, op_data);
 266         if (rc) {
 267                 if (rc == -ERANGE) {
 268                         acl_bufsize = min_t(__u32,
 269                                             imp->imp_connect_data.ocd_max_easize,
 270                                             XATTR_SIZE_MAX);
 271                         mdc_reset_acl_req(req);
 272                         goto again;
 273                 }
 274
 275                 ptlrpc_req_finished(req);
 276         } else {
 277                 *request = req;
 278         }
 279
 280         RETURN(rc);
 281 }
 282
 283 static int mdc_getattr_name(struct obd_export *exp, struct md_op_data *op_data,
 284                             struct ptlrpc_request **request)
 285 {
 286         struct ptlrpc_request *req;
 287         struct obd_import *imp = class_exp2cliimp(exp);
 288         __u32 acl_bufsize = LUSTRE_POSIX_ACL_MAX_SIZE_OLD;
 289         int rc;
 290         ENTRY;
 291
 292         *request = NULL;
 293         req = ptlrpc_request_alloc(imp, &RQF_MDS_GETATTR_NAME);
 294         if (req == NULL)
 295                 RETURN(-ENOMEM);
 296
 297         req_capsule_set_size(&req->rq_pill, &RMF_NAME, RCL_CLIENT,
 298                              op_data->op_namelen + 1);
 299
 300         rc = ptlrpc_request_pack(req, LUSTRE_MDS_VERSION, MDS_GETATTR_NAME);
 301         if (rc) {
 302                 ptlrpc_request_free(req);
 303                 RETURN(rc);
 304         }
 305
 306         if (op_data->op_name) {
 307                 char *name = req_capsule_client_get(&req->rq_pill, &RMF_NAME);
 308                 LASSERT(strnlen(op_data->op_name, op_data->op_namelen) ==
 309                                 op_data->op_namelen);
 310                 memcpy(name, op_data->op_name, op_data->op_namelen);
 311         }
 312
 313 again:
 314         mdc_pack_body(&req->rq_pill, &op_data->op_fid1, op_data->op_valid,
 315                       op_data->op_mode, op_data->op_suppgids[0], 0);
 316         req_capsule_set_size(&req->rq_pill, &RMF_MDT_MD, RCL_SERVER,
 317                              op_data->op_mode);
 318         req_capsule_set_size(&req->rq_pill, &RMF_ACL, RCL_SERVER, acl_bufsize);
 319         req_capsule_set_size(&req->rq_pill, &RMF_FILE_ENCCTX, RCL_SERVER, 0);
 320         ptlrpc_request_set_replen(req);
 321         if (op_data->op_bias & MDS_FID_OP) {
 322                 struct mdt_body *b = req_capsule_client_get(&req->rq_pill,
 323                                                             &RMF_MDT_BODY);
 324
 325                 if (b) {
 326                         b->mbo_valid |= OBD_MD_NAMEHASH;
 327                         b->mbo_fid2 = op_data->op_fid2;
 328                 }
 329         }
 330
 331         rc = mdc_getattr_common(exp, req, NULL);
 332         if (rc) {
 333                 if (rc == -ERANGE) {
 334                         acl_bufsize = min_t(__u32,
 335                                             imp->imp_connect_data.ocd_max_easize,
 336                                             XATTR_SIZE_MAX);
 337                         mdc_reset_acl_req(req);
 338                         goto again;
 339                 }
 340
 341                 ptlrpc_req_finished(req);
 342         } else {
 343                 *request = req;
 344         }
 345
 346         RETURN(rc);
 347 }
 348
 349 static int mdc_xattr_common(struct obd_export *exp,const struct req_format *fmt,
 350                             const struct lu_fid *fid, int opcode, u64 valid,
 351                             const char *xattr_name, const char *input,
 352                             int input_size, int output_size, int flags,
 353                             __u32 suppgid, struct ptlrpc_request **request)
 354 {
 355         struct ptlrpc_request *req;
 356         int   xattr_namelen = 0;
 357         char *tmp;
 358         int   rc;
 359         ENTRY;
 360
 361         *request = NULL;
 362         req = ptlrpc_request_alloc(class_exp2cliimp(exp), fmt);
 363         if (req == NULL)
 364                 RETURN(-ENOMEM);
 365
 366         if (xattr_name) {
 367                 xattr_namelen = strlen(xattr_name) + 1;
 368                 req_capsule_set_size(&req->rq_pill, &RMF_NAME, RCL_CLIENT,
 369                                      xattr_namelen);
 370         }
 371         if (input_size)
 372                 LASSERT(input);
 373         req_capsule_set_size(&req->rq_pill, &RMF_EADATA, RCL_CLIENT,
 374                              input_size);
 375
 376         /* get SELinux policy info if any */
 377         rc = sptlrpc_get_sepol(req);
 378         if (rc < 0) {
 379                 ptlrpc_request_free(req);
 380                 RETURN(rc);
 381         }
 382         req_capsule_set_size(&req->rq_pill, &RMF_SELINUX_POL, RCL_CLIENT,
 383                              strlen(req->rq_sepol) ?
 384                              strlen(req->rq_sepol) + 1 : 0);
 385
 386         /* Flush local XATTR locks to get rid of a possible cancel RPC */
 387         if (opcode == MDS_REINT && fid_is_sane(fid) &&
 388             exp->exp_connect_data.ocd_ibits_known & MDS_INODELOCK_XATTR) {
 389                 LIST_HEAD(cancels);
 390                 int count;
 391
 392                 /* Without that packing would fail */
 393                 if (input_size == 0)
 394                         req_capsule_set_size(&req->rq_pill, &RMF_EADATA,
 395                                              RCL_CLIENT, 0);
 396
 397                 count = mdc_resource_get_unused(exp, fid,
 398                                                 &cancels, LCK_EX,
 399                                                 MDS_INODELOCK_XATTR);
 400
 401                 rc = mdc_prep_elc_req(exp, req, MDS_REINT, &cancels, count);
 402                 if (rc) {
 403                         ptlrpc_request_free(req);
 404                         RETURN(rc);
 405                 }
 406         } else {
 407                 rc = ptlrpc_request_pack(req, LUSTRE_MDS_VERSION, opcode);
 408                 if (rc) {
 409                         ptlrpc_request_free(req);
 410                         RETURN(rc);
 411                 }
 412         }
 413
 414         if (opcode == MDS_REINT) {
 415                 struct mdt_rec_setxattr *rec;
 416
 417                 BUILD_BUG_ON(sizeof(struct mdt_rec_setxattr) !=
 418                              sizeof(struct mdt_rec_reint));
 419                 rec = req_capsule_client_get(&req->rq_pill, &RMF_REC_REINT);
 420                 rec->sx_opcode = REINT_SETXATTR;
 421                 rec->sx_fsuid  = from_kuid(&init_user_ns, current_fsuid());
 422                 rec->sx_fsgid  = from_kgid(&init_user_ns, current_fsgid());
 423                 rec->sx_cap = ll_capability_u32(current_cap());
 424                 rec->sx_suppgid1 = suppgid;
 425                 rec->sx_suppgid2 = -1;
 426                 rec->sx_fid    = *fid;
 427                 rec->sx_valid  = valid | OBD_MD_FLCTIME;
 428                 rec->sx_time   = ktime_get_real_seconds();
 429                 rec->sx_size   = output_size;
 430                 rec->sx_flags  = flags;
 431         } else {
 432                 mdc_pack_body(&req->rq_pill, fid, valid, output_size,
 433                               suppgid, flags);
 434                 /* Avoid deadlock with modifying RPCs on MDS_REQUEST_PORTAL.
 435                  * See LU-15245.
 436                  */
 437                 req->rq_request_portal = MDS_READPAGE_PORTAL;
 438         }
 439
 440         if (xattr_name) {
 441                 tmp = req_capsule_client_get(&req->rq_pill, &RMF_NAME);
 442                 memcpy(tmp, xattr_name, xattr_namelen);
 443         }
 444         if (input_size) {
 445                 tmp = req_capsule_client_get(&req->rq_pill, &RMF_EADATA);
 446                 memcpy(tmp, input, input_size);
 447         }
 448
 449         mdc_file_sepol_pack(&req->rq_pill);
 450
 451         if (req_capsule_has_field(&req->rq_pill, &RMF_EADATA, RCL_SERVER))
 452                 req_capsule_set_size(&req->rq_pill, &RMF_EADATA,
 453                                      RCL_SERVER, output_size);
 454         ptlrpc_request_set_replen(req);
 455
 456         /* make rpc */
 457         if (opcode == MDS_REINT)
 458                 ptlrpc_get_mod_rpc_slot(req);
 459
 460         rc = ptlrpc_queue_wait(req);
 461
 462         if (opcode == MDS_REINT)
 463                 ptlrpc_put_mod_rpc_slot(req);
 464
 465         if (rc)
 466                 ptlrpc_req_finished(req);
 467         else
 468                 *request = req;
 469         RETURN(rc);
 470 }
 471
 472 static int mdc_setxattr(struct obd_export *exp, const struct lu_fid *fid,
 473                         u64 obd_md_valid, const char *name,
 474                         const void *value, size_t value_size,
 475                         unsigned int xattr_flags, u32 suppgid,
 476                         struct ptlrpc_request **req)
 477 {
 478         LASSERT(obd_md_valid == OBD_MD_FLXATTR ||
 479                 obd_md_valid == OBD_MD_FLXATTRRM);
 480
 481         return mdc_xattr_common(exp, &RQF_MDS_REINT_SETXATTR,
 482                                 fid, MDS_REINT, obd_md_valid, name,
 483                                 value, value_size, 0, xattr_flags, suppgid,
 484                                 req);
 485 }
 486
 487 static int mdc_getxattr(struct obd_export *exp, const struct lu_fid *fid,
 488                         u64 obd_md_valid, const char *name, size_t buf_size,
 489                         struct ptlrpc_request **req)
 490 {
 491         struct mdt_body *body;
 492         int rc;
 493
 494         LASSERT(obd_md_valid == OBD_MD_FLXATTR ||
 495                 obd_md_valid == OBD_MD_FLXATTRLS);
 496
 497         /* Message below is checked in sanity-selinux test_20d
 498          * and sanity-sec test_49
 499          */
 500         CDEBUG(D_INFO, "%s: get xattr '%s' for "DFID"\n",
 501                exp->exp_obd->obd_name, name, PFID(fid));
 502         rc = mdc_xattr_common(exp, &RQF_MDS_GETXATTR, fid, MDS_GETXATTR,
 503                               obd_md_valid, name, NULL, 0, buf_size, 0, -1,
 504                               req);
 505         if (rc < 0)
 506                 GOTO(out, rc);
 507
 508         body = req_capsule_server_get(&(*req)->rq_pill, &RMF_MDT_BODY);
 509         if (body == NULL)
 510                 GOTO(out, rc = -EPROTO);
 511
 512         /* only detect the xattr size */
 513         if (buf_size == 0) {
 514                 /* LU-11109: Older MDTs do not distinguish
 515                  * between nonexistent xattrs and zero length
 516                  * values in this case. Newer MDTs will return
 517                  * -ENODATA or set OBD_MD_FLXATTR. */
 518                 GOTO(out, rc = body->mbo_eadatasize);
 519         }
 520
 521         if (body->mbo_eadatasize == 0) {
 522                 /* LU-11109: Newer MDTs set OBD_MD_FLXATTR on
 523                  * success so that we can distinguish between
 524                  * zero length value and nonexistent xattr.
 525                  *
 526                  * If OBD_MD_FLXATTR is not set then we keep
 527                  * the old behavior and return -ENODATA for
 528                  * getxattr() when mbo_eadatasize is 0. But
 529                  * -ENODATA only makes sense for getxattr()
 530                  * and not for listxattr(). */
 531                 if (body->mbo_valid & OBD_MD_FLXATTR)
 532                         GOTO(out, rc = 0);
 533                 else if (obd_md_valid == OBD_MD_FLXATTR)
 534                         GOTO(out, rc = -ENODATA);
 535                 else
 536                         GOTO(out, rc = 0);
 537         }
 538
 539         GOTO(out, rc = body->mbo_eadatasize);
 540 out:
 541         if (rc < 0) {
 542                 ptlrpc_req_finished(*req);
 543                 *req = NULL;
 544         }
 545
 546         return rc;
 547 }
 548
 549 static int mdc_get_lustre_md(struct obd_export *exp, struct req_capsule *pill,
 550                              struct obd_export *dt_exp,
 551                              struct obd_export *md_exp,
 552                              struct lustre_md *md)
 553 {
 554         int rc;
 555         ENTRY;
 556
 557         LASSERT(md);
 558         memset(md, 0, sizeof(*md));
 559
 560         md->body = req_capsule_server_get(pill, &RMF_MDT_BODY);
 561         LASSERT(md->body != NULL);
 562
 563         if (md->body->mbo_valid & OBD_MD_FLEASIZE) {
 564                 if (!S_ISREG(md->body->mbo_mode)) {
 565                         CDEBUG(D_INFO, "OBD_MD_FLEASIZE set, should be a "
 566                                "regular file, but is not\n");
 567                         GOTO(out, rc = -EPROTO);
 568                 }
 569
 570                 if (md->body->mbo_eadatasize == 0) {
 571                         CDEBUG(D_INFO, "OBD_MD_FLEASIZE set, "
 572                                "but eadatasize 0\n");
 573                         GOTO(out, rc = -EPROTO);
 574                 }
 575
 576                 md->layout.lb_len = md->body->mbo_eadatasize;
 577                 md->layout.lb_buf = req_capsule_server_sized_get(pill,
 578                                                         &RMF_MDT_MD,
 579                                                         md->layout.lb_len);
 580                 if (md->layout.lb_buf == NULL)
 581                         GOTO(out, rc = -EPROTO);
 582         } else if (md->body->mbo_valid & OBD_MD_FLDIREA) {
 583                 const union lmv_mds_md *lmv;
 584                 size_t lmv_size;
 585
 586                 if (!S_ISDIR(md->body->mbo_mode)) {
 587                         CDEBUG(D_INFO, "OBD_MD_FLDIREA set, should be a "
 588                                "directory, but is not\n");
 589                         GOTO(out, rc = -EPROTO);
 590                 }
 591
 592                 if (md_exp->exp_obd->obd_type->typ_lu == &mdc_device_type) {
 593                         CERROR("%s: no LMV, upgrading from old version?\n",
 594                                md_exp->exp_obd->obd_name);
 595
 596                         GOTO(out_acl, rc = 0);
 597                 }
 598
 599                 if (md->body->mbo_valid & OBD_MD_MEA) {
 600                         lmv_size = md->body->mbo_eadatasize;
 601                         if (lmv_size == 0) {
 602                                 CDEBUG(D_INFO, "OBD_MD_FLDIREA is set, "
 603                                        "but eadatasize 0\n");
 604                                 RETURN(-EPROTO);
 605                         }
 606
 607                         lmv = req_capsule_server_sized_get(pill, &RMF_MDT_MD,
 608                                                            lmv_size);
 609                         if (lmv == NULL)
 610                                 GOTO(out, rc = -EPROTO);
 611
 612                         rc = md_unpackmd(md_exp, &md->lmv, lmv, lmv_size);
 613                         if (rc < 0)
 614                                 GOTO(out, rc);
 615
 616                         if (rc < (int)sizeof(*md->lmv)) {
 617                                 struct lmv_foreign_md *lfm = md->lfm;
 618
 619                                 /* short (< sizeof(struct lmv_stripe_md))
 620                                  * foreign LMV case
 621                                  */
 622                                 if (lfm->lfm_magic != LMV_MAGIC_FOREIGN) {
 623                                         CDEBUG(D_INFO,
 624                                                "lmv size too small: %d < %d\n",
 625                                                rc, (int)sizeof(*md->lmv));
 626                                         GOTO(out, rc = -EPROTO);
 627                                 }
 628                         }
 629                 }
 630
 631                 /* since 2.12.58 intent_getattr fetches default LMV */
 632                 if (md->body->mbo_valid & OBD_MD_DEFAULT_MEA) {
 633                         lmv_size = sizeof(struct lmv_user_md);
 634                         lmv = req_capsule_server_sized_get(pill,
 635                                                            &RMF_DEFAULT_MDT_MD,
 636                                                            lmv_size);
 637                         if (!lmv)
 638                                 GOTO(out, rc = -EPROTO);
 639
 640                         rc = md_unpackmd(md_exp, &md->default_lmv, lmv,
 641                                          lmv_size);
 642                         if (rc < 0)
 643                                 GOTO(out, rc);
 644
 645                         if (rc < (int)sizeof(*md->default_lmv)) {
 646                                 CDEBUG(D_INFO,
 647                                        "default lmv size too small: %d < %d\n",
 648                                         rc, (int)sizeof(*md->default_lmv));
 649                                 GOTO(out, rc = -EPROTO);
 650                         }
 651                 }
 652         }
 653         rc = 0;
 654
 655 out_acl:
 656         if (md->body->mbo_valid & OBD_MD_FLACL) {
 657                 /* for ACL, it's possible that FLACL is set but aclsize is zero.
 658                  * only when aclsize != 0 there's an actual segment for ACL
 659                  * in reply buffer.
 660                  */
 661                 rc = mdc_unpack_acl(pill, md);
 662                 if (rc)
 663                         GOTO(out, rc);
 664         }
 665
 666         EXIT;
 667 out:
 668         if (rc)
 669                 lmd_clear_acl(md);
 670
 671         return rc;
 672 }
 673
 674 static int mdc_free_lustre_md(struct obd_export *exp, struct lustre_md *md)
 675 {
 676         ENTRY;
 677         RETURN(0);
 678 }
 679
 680 void mdc_replay_open(struct ptlrpc_request *req)
 681 {
 682         struct md_open_data *mod = req->rq_cb_data;
 683         struct ptlrpc_request *close_req;
 684         struct obd_client_handle *och;
 685         struct lustre_handle old_open_handle = { };
 686         struct mdt_body *body;
 687         struct ldlm_reply *rep;
 688         ENTRY;
 689
 690         if (mod == NULL) {
 691                 DEBUG_REQ(D_ERROR, req,
 692                           "cannot properly replay without open data");
 693                 EXIT;
 694                 return;
 695         }
 696
 697         body = req_capsule_server_get(&req->rq_pill, &RMF_MDT_BODY);
 698         LASSERT(body != NULL);
 699
 700         rep = req_capsule_server_get(&req->rq_pill, &RMF_DLM_REP);
 701         if (rep != NULL && rep->lock_policy_res2 != 0)
 702                 DEBUG_REQ(D_ERROR, req, "Open request replay failed with %ld ",
 703                         (long int)rep->lock_policy_res2);
 704
 705         spin_lock(&req->rq_lock);
 706         och = mod->mod_och;
 707         if (och && och->och_open_handle.cookie)
 708                 req->rq_early_free_repbuf = 1;
 709         else
 710                 req->rq_early_free_repbuf = 0;
 711         spin_unlock(&req->rq_lock);
 712
 713         if (req->rq_early_free_repbuf) {
 714                 struct lustre_handle *file_open_handle;
 715
 716                 LASSERT(och->och_magic == OBD_CLIENT_HANDLE_MAGIC);
 717
 718                 file_open_handle = &och->och_open_handle;
 719                 CDEBUG(D_HA, "updating handle from %#llx to %#llx\n",
 720                        file_open_handle->cookie, body->mbo_open_handle.cookie);
 721                 old_open_handle = *file_open_handle;
 722                 *file_open_handle = body->mbo_open_handle;
 723         }
 724
 725         close_req = mod->mod_close_req;
 726         if (close_req) {
 727                 __u32 opc = lustre_msg_get_opc(close_req->rq_reqmsg);
 728                 struct mdt_ioepoch *epoch;
 729
 730                 LASSERT(opc == MDS_CLOSE);
 731                 epoch = req_capsule_client_get(&close_req->rq_pill,
 732                                                &RMF_MDT_EPOCH);
 733                 LASSERT(epoch);
 734
 735                 if (req->rq_early_free_repbuf)
 736                         LASSERT(old_open_handle.cookie ==
 737                                 epoch->mio_open_handle.cookie);
 738
 739                 DEBUG_REQ(D_HA, close_req, "updating close body with new fh");
 740                 epoch->mio_open_handle = body->mbo_open_handle;
 741         }
 742         EXIT;
 743 }
 744
 745 void mdc_commit_open(struct ptlrpc_request *req)
 746 {
 747         struct md_open_data *mod = req->rq_cb_data;
 748         if (mod == NULL)
 749                 return;
 750
 751         /**
 752          * No need to touch md_open_data::mod_och, it holds a reference on
 753          * \var mod and will zero references to each other, \var mod will be
 754          * freed after that when md_open_data::mod_och will put the reference.
 755          */
 756
 757         /**
 758          * Do not let open request to disappear as it still may be needed
 759          * for close rpc to happen (it may happen on evict only, otherwise
 760          * ptlrpc_request::rq_replay does not let mdc_commit_open() to be
 761          * called), just mark this rpc as committed to distinguish these 2
 762          * cases, see mdc_close() for details. The open request reference will
 763          * be put along with freeing \var mod.
 764          */
 765         ptlrpc_request_addref(req);
 766         spin_lock(&req->rq_lock);
 767         req->rq_committed = 1;
 768         spin_unlock(&req->rq_lock);
 769         req->rq_cb_data = NULL;
 770         obd_mod_put(mod);
 771 }
 772
 773 int mdc_set_open_replay_data(struct obd_export *exp,
 774                              struct obd_client_handle *och,
 775                              struct lookup_intent *it)
 776 {
 777         struct md_open_data     *mod;
 778         struct mdt_rec_create   *rec;
 779         struct mdt_body         *body;
 780         struct ptlrpc_request   *open_req = it->it_request;
 781         struct obd_import       *imp = open_req->rq_import;
 782         ENTRY;
 783
 784         if (!open_req->rq_replay)
 785                 RETURN(0);
 786
 787         rec = req_capsule_client_get(&open_req->rq_pill, &RMF_REC_REINT);
 788         body = req_capsule_server_get(&open_req->rq_pill, &RMF_MDT_BODY);
 789         LASSERT(rec != NULL);
 790         /* Incoming message in my byte order (it's been swabbed). */
 791         /* Outgoing messages always in my byte order. */
 792         LASSERT(body != NULL);
 793
 794         /* Only if the import is replayable, we set replay_open data */
 795         if (och && imp->imp_replayable) {
 796                 mod = obd_mod_alloc();
 797                 if (mod == NULL) {
 798                         DEBUG_REQ(D_ERROR, open_req,
 799                                   "cannot allocate md_open_data");
 800                         RETURN(0);
 801                 }
 802
 803                 /**
 804                  * Take a reference on \var mod, to be freed on mdc_close().
 805                  * It protects \var mod from being freed on eviction (commit
 806                  * callback is called despite rq_replay flag).
 807                  * Another reference for \var och.
 808                  */
 809                 obd_mod_get(mod);
 810                 obd_mod_get(mod);
 811
 812                 spin_lock(&open_req->rq_lock);
 813                 och->och_mod = mod;
 814                 mod->mod_och = och;
 815                 mod->mod_is_create = it_disposition(it, DISP_OPEN_CREATE) ||
 816                                      it_disposition(it, DISP_OPEN_STRIPE);
 817                 mod->mod_open_req = open_req;
 818                 open_req->rq_cb_data = mod;
 819                 open_req->rq_commit_cb = mdc_commit_open;
 820                 open_req->rq_early_free_repbuf = 1;
 821                 spin_unlock(&open_req->rq_lock);
 822         }
 823
 824         rec->cr_fid2 = body->mbo_fid1;
 825         rec->cr_open_handle_old = body->mbo_open_handle;
 826         open_req->rq_replay_cb = mdc_replay_open;
 827         if (!fid_is_sane(&body->mbo_fid1)) {
 828                 DEBUG_REQ(D_ERROR, open_req,
 829                           "saving replay request with insane FID " DFID,
 830                           PFID(&body->mbo_fid1));
 831                 LBUG();
 832         }
 833
 834         DEBUG_REQ(D_RPCTRACE, open_req, "Set up open replay data");
 835         RETURN(0);
 836 }
 837
 838 static void mdc_free_open(struct md_open_data *mod)
 839 {
 840         int committed = 0;
 841
 842         if (mod->mod_is_create == 0 &&
 843             imp_connect_disp_stripe(mod->mod_open_req->rq_import))
 844                 committed = 1;
 845
 846         /**
 847          * No reason to asssert here if the open request has
 848          * rq_replay == 1. It means that mdc_close failed, and
 849          * close request wasn`t sent. It is not fatal to client.
 850          * The worst thing is eviction if the client gets open lock
 851          **/
 852
 853         DEBUG_REQ(D_RPCTRACE, mod->mod_open_req,
 854                   "free open request, rq_replay=%d",
 855                   mod->mod_open_req->rq_replay);
 856
 857         ptlrpc_request_committed(mod->mod_open_req, committed);
 858         if (mod->mod_close_req)
 859                 ptlrpc_request_committed(mod->mod_close_req, committed);
 860 }
 861
 862 static int mdc_clear_open_replay_data(struct obd_export *exp,
 863                                       struct obd_client_handle *och)
 864 {
 865         struct md_open_data *mod = och->och_mod;
 866         ENTRY;
 867
 868         /**
 869          * It is possible to not have \var mod in a case of eviction between
 870          * lookup and ll_file_open().
 871          **/
 872         if (mod == NULL)
 873                 RETURN(0);
 874
 875         LASSERT(mod != LP_POISON);
 876         LASSERT(mod->mod_open_req != NULL);
 877
 878         spin_lock(&mod->mod_open_req->rq_lock);
 879         if (mod->mod_och)
 880                 mod->mod_och->och_open_handle.cookie = 0;
 881         mod->mod_open_req->rq_early_free_repbuf = 0;
 882         spin_unlock(&mod->mod_open_req->rq_lock);
 883         mdc_free_open(mod);
 884
 885         mod->mod_och = NULL;
 886         och->och_mod = NULL;
 887         obd_mod_put(mod);
 888
 889         RETURN(0);
 890 }
 891
 892 static int mdc_close(struct obd_export *exp, struct md_op_data *op_data,
 893                      struct md_open_data *mod, struct ptlrpc_request **request)
 894 {
 895         struct obd_device     *obd = class_exp2obd(exp);
 896         struct ptlrpc_request *req;
 897         struct req_format     *req_fmt;
 898         size_t                 u32_count = 0;
 899         int                    rc;
 900         int                    saved_rc = 0;
 901         ENTRY;
 902
 903         CDEBUG(D_INODE, "%s: "DFID" file closed with intent: %x\n",
 904                exp->exp_obd->obd_name, PFID(&op_data->op_fid1),
 905                op_data->op_bias);
 906
 907         if (op_data->op_bias & MDS_CLOSE_INTENT) {
 908                 req_fmt = &RQF_MDS_CLOSE_INTENT;
 909                 if (op_data->op_bias & MDS_HSM_RELEASE) {
 910                         /* allocate a FID for volatile file */
 911                         rc = mdc_fid_alloc(NULL, exp, &op_data->op_fid2,
 912                                            op_data);
 913                         if (rc < 0) {
 914                                 CERROR("%s: "DFID" allocating FID: rc = %d\n",
 915                                        obd->obd_name, PFID(&op_data->op_fid1),
 916                                        rc);
 917                                 /* save the errcode and proceed to close */
 918                                 saved_rc = rc;
 919                         }
 920                 }
 921                 if (op_data->op_bias & MDS_CLOSE_RESYNC_DONE) {
 922                         size_t count = op_data->op_data_size / sizeof(__u32);
 923
 924                         if (count > INLINE_RESYNC_ARRAY_SIZE)
 925                                 u32_count = count;
 926                 }
 927         } else {
 928                 req_fmt = &RQF_MDS_CLOSE;
 929         }
 930
 931         *request = NULL;
 932         if (CFS_FAIL_CHECK(OBD_FAIL_MDC_CLOSE))
 933                 req = NULL;
 934         else
 935                 req = ptlrpc_request_alloc(class_exp2cliimp(exp), req_fmt);
 936
 937         /* Ensure that this close's handle is fixed up during replay. */
 938         if (likely(mod != NULL)) {
 939                 LASSERTF(mod->mod_open_req != NULL &&
 940                          mod->mod_open_req->rq_type != LI_POISON,
 941                          "POISONED open %p!\n", mod->mod_open_req);
 942
 943                 mod->mod_close_req = req;
 944
 945                 DEBUG_REQ(D_RPCTRACE, mod->mod_open_req, "matched open");
 946                 /* We no longer want to preserve this open for replay even
 947                  * though the open was committed. b=3632, b=3633 */
 948                 spin_lock(&mod->mod_open_req->rq_lock);
 949                 mod->mod_open_req->rq_replay = 0;
 950                 spin_unlock(&mod->mod_open_req->rq_lock);
 951         } else {
 952                 CDEBUG(D_HA, "couldn't find open req; expecting close error\n");
 953         }
 954         if (req == NULL) {
 955                 /**
 956                  * TODO: repeat close after errors
 957                  */
 958                 CWARN("%s: close of FID "DFID" failed, file reference will be "
 959                       "dropped when this client unmounts or is evicted\n",
 960                       obd->obd_name, PFID(&op_data->op_fid1));
 961                 GOTO(out, rc = -ENOMEM);
 962         }
 963
 964         if (u32_count > 0)
 965                 req_capsule_set_size(&req->rq_pill, &RMF_U32, RCL_CLIENT,
 966                                      u32_count * sizeof(__u32));
 967
 968         rc = ptlrpc_request_pack(req, LUSTRE_MDS_VERSION, MDS_CLOSE);
 969         if (rc) {
 970                 ptlrpc_request_free(req);
 971                 req = NULL;
 972                 GOTO(out, rc);
 973         }
 974
 975         /* To avoid a livelock (bug 7034), we need to send CLOSE RPCs to a
 976          * portal whose threads are not taking any DLM locks and are therefore
 977          * always progressing */
 978         req->rq_request_portal = MDS_READPAGE_PORTAL;
 979         ptlrpc_at_set_req_timeout(req);
 980
 981         if (!obd->u.cli.cl_lsom_update ||
 982             !(exp_connect_flags2(exp) & OBD_CONNECT2_LSOM))
 983                 op_data->op_xvalid &= ~(OP_XVALID_LAZYSIZE |
 984                                         OP_XVALID_LAZYBLOCKS);
 985
 986         mdc_close_pack(&req->rq_pill, op_data);
 987
 988         req_capsule_set_size(&req->rq_pill, &RMF_MDT_MD, RCL_SERVER,
 989                              obd->u.cli.cl_default_mds_easize);
 990
 991         ptlrpc_request_set_replen(req);
 992
 993         ptlrpc_get_mod_rpc_slot(req);
 994         rc = ptlrpc_queue_wait(req);
 995         ptlrpc_put_mod_rpc_slot(req);
 996
 997         if (req->rq_repmsg == NULL) {
 998                 CDEBUG(D_RPCTRACE, "request %p failed to send: rc = %d\n", req,
 999                        req->rq_status);
1000                 if (rc == 0)
1001                         rc = req->rq_status ?: -EIO;
1002         } else if (rc == 0 || rc == -EAGAIN) {
1003                 struct mdt_body *body;
1004
1005                 rc = lustre_msg_get_status(req->rq_repmsg);
1006                 if (lustre_msg_get_type(req->rq_repmsg) == PTL_RPC_MSG_ERR) {
1007                         DEBUG_REQ(D_ERROR, req,
1008                                   "type = PTL_RPC_MSG_ERR: rc = %d", rc);
1009                         if (rc > 0)
1010                                 rc = -rc;
1011                 }
1012                 body = req_capsule_server_get(&req->rq_pill, &RMF_MDT_BODY);
1013                 if (body == NULL)
1014                         rc = -EPROTO;
1015         } else if (rc == -ESTALE) {
1016                 /**
1017                  * it can be allowed error after 3633 if open was committed and
1018                  * server failed before close was sent. Let's check if mod
1019                  * exists and return no error in that case
1020                  */
1021                 if (mod) {
1022                         DEBUG_REQ(D_HA, req, "Reset ESTALE = %d", rc);
1023                         LASSERT(mod->mod_open_req != NULL);
1024                         if (mod->mod_open_req->rq_committed)
1025                                 rc = 0;
1026                 }
1027         }
1028
1029 out:
1030         if (mod) {
1031                 if (rc != 0)
1032                         mod->mod_close_req = NULL;
1033                 if (mod->mod_close_req)
1034                         ptlrpc_request_addref(mod->mod_close_req);
1035                 /* Since now, mod is accessed through open_req only,
1036                  * thus close req does not keep a reference on mod anymore. */
1037                 obd_mod_put(mod);
1038         }
1039         *request = req;
1040
1041         RETURN(rc < 0 ? rc : saved_rc);
1042 }
1043
1044 static int mdc_getpage(struct obd_export *exp, const struct lu_fid *fid,
1045                        u64 offset, struct page **pages, int npages,
1046                        struct ptlrpc_request **request)
1047 {
1048         struct ptlrpc_request   *req;
1049         struct ptlrpc_bulk_desc *desc;
1050         int                      i;
1051         int                      resends = 0;
1052         int                      rc;
1053         ENTRY;
1054
1055         *request = NULL;
1056
1057 restart_bulk:
1058         req = ptlrpc_request_alloc(class_exp2cliimp(exp), &RQF_MDS_READPAGE);
1059         if (req == NULL)
1060                 RETURN(-ENOMEM);
1061
1062         rc = ptlrpc_request_pack(req, LUSTRE_MDS_VERSION, MDS_READPAGE);
1063         if (rc) {
1064                 ptlrpc_request_free(req);
1065                 RETURN(rc);
1066         }
1067
1068         req->rq_request_portal = MDS_READPAGE_PORTAL;
1069         ptlrpc_at_set_req_timeout(req);
1070
1071         desc = ptlrpc_prep_bulk_imp(req, npages, 1,
1072                                     PTLRPC_BULK_PUT_SINK,
1073                                     MDS_BULK_PORTAL,
1074                                     &ptlrpc_bulk_kiov_pin_ops);
1075         if (desc == NULL) {
1076                 ptlrpc_req_finished(req);
1077                 RETURN(-ENOMEM);
1078         }
1079
1080         /* NB req now owns desc and will free it when it gets freed */
1081         for (i = 0; i < npages; i++)
1082                 desc->bd_frag_ops->add_kiov_frag(desc, pages[i], 0,
1083                                                  PAGE_SIZE);
1084
1085         mdc_readdir_pack(&req->rq_pill, offset, PAGE_SIZE * npages, fid);
1086
1087         ptlrpc_request_set_replen(req);
1088         rc = ptlrpc_queue_wait(req);
1089         if (rc) {
1090                 ptlrpc_req_finished(req);
1091                 if (rc != -ETIMEDOUT)
1092                         RETURN(rc);
1093
1094                 resends++;
1095                 if (!client_should_resend(resends, &exp->exp_obd->u.cli)) {
1096                         CERROR("%s: too many resend retries: rc = %d\n",
1097                                exp->exp_obd->obd_name, -EIO);
1098                         RETURN(-EIO);
1099                 }
1100
1101                 /* If a signal interrupts then the timeout returned will
1102                  * not be zero. In that case return -EINTR
1103                  */
1104                 if (msleep_interruptible(resends * 1000))
1105                         RETURN(-EINTR);
1106
1107                 goto restart_bulk;
1108         }
1109
1110         rc = sptlrpc_cli_unwrap_bulk_read(req, req->rq_bulk,
1111                                           req->rq_bulk->bd_nob_transferred);
1112         if (rc < 0) {
1113                 ptlrpc_req_finished(req);
1114                 RETURN(rc);
1115         }
1116
1117         if (req->rq_bulk->bd_nob_transferred & ~LU_PAGE_MASK) {
1118                 CERROR("%s: unexpected bytes transferred: %d (%ld expected)\n",
1119                        exp->exp_obd->obd_name, req->rq_bulk->bd_nob_transferred,
1120                        PAGE_SIZE * npages);
1121                 ptlrpc_req_finished(req);
1122                 RETURN(-EPROTO);
1123         }
1124
1125         *request = req;
1126         RETURN(0);
1127 }
1128
1129 static void mdc_release_page(struct page *page, int remove)
1130 {
1131         if (remove) {
1132                 lock_page(page);
1133                 if (likely(page->mapping != NULL))
1134                         cfs_delete_from_page_cache(page);
1135                 unlock_page(page);
1136         }
1137         put_page(page);
1138 }
1139
1140 static struct page *mdc_page_locate(struct address_space *mapping, __u64 *hash,
1141                                     __u64 *start, __u64 *end, int hash64)
1142 {
1143         /*
1144          * Complement of hash is used as an index so that
1145          * radix_tree_gang_lookup() can be used to find a page with starting
1146          * hash _smaller_ than one we are looking for.
1147          */
1148         unsigned long offset = hash_x_index(*hash, hash64);
1149         struct page *page;
1150         unsigned long flags;
1151         int found;
1152
1153         ll_xa_lock_irqsave(&mapping->i_pages, flags);
1154         found = radix_tree_gang_lookup(&mapping->page_tree,
1155                                        (void **)&page, offset, 1);
1156         if (found > 0 && !ll_xa_is_value(page)) {
1157                 struct lu_dirpage *dp;
1158
1159                 get_page(page);
1160                 ll_xa_unlock_irqrestore(&mapping->i_pages, flags);
1161                 /*
1162                  * In contrast to find_lock_page() we are sure that directory
1163                  * page cannot be truncated (while DLM lock is held) and,
1164                  * hence, can avoid restart.
1165                  *
1166                  * In fact, page cannot be locked here at all, because
1167                  * mdc_read_page_remote does synchronous io.
1168                  */
1169                 wait_on_page_locked(page);
1170                 if (PageUptodate(page)) {
1171                         dp = kmap(page);
1172                         if (BITS_PER_LONG == 32 && hash64) {
1173                                 *start = le64_to_cpu(dp->ldp_hash_start) >> 32;
1174                                 *end   = le64_to_cpu(dp->ldp_hash_end) >> 32;
1175                                 *hash  = *hash >> 32;
1176                         } else {
1177                                 *start = le64_to_cpu(dp->ldp_hash_start);
1178                                 *end   = le64_to_cpu(dp->ldp_hash_end);
1179                         }
1180                         if (unlikely(*start == 1 && *hash == 0))
1181                                 *hash = *start;
1182                         else
1183                                 LASSERTF(*start <= *hash, "start = %#llx"
1184                                          ",end = %#llx,hash = %#llx\n",
1185                                          *start, *end, *hash);
1186                         CDEBUG(D_VFSTRACE, "offset %lx [%#llx %#llx],"
1187                               " hash %#llx\n", offset, *start, *end, *hash);
1188                         if (*hash > *end) {
1189                                 kunmap(page);
1190                                 mdc_release_page(page, 0);
1191                                 page = NULL;
1192                         } else if (*end != *start && *hash == *end) {
1193                                 /*
1194                                  * upon hash collision, remove this page,
1195                                  * otherwise put page reference, and
1196                                  * mdc_read_page_remote() will issue RPC to
1197                                  * fetch the page we want.
1198                                  */
1199                                 kunmap(page);
1200                                 mdc_release_page(page,
1201                                     le32_to_cpu(dp->ldp_flags) & LDF_COLLIDE);
1202                                 page = NULL;
1203                         }
1204                 } else {
1205                         put_page(page);
1206                         page = ERR_PTR(-EIO);
1207                 }
1208         } else {
1209                 ll_xa_unlock_irqrestore(&mapping->i_pages, flags);
1210                 page = NULL;
1211         }
1212         return page;
1213 }
1214
1215 /*
1216  * Adjust a set of pages, each page containing an array of lu_dirpages,
1217  * so that each page can be used as a single logical lu_dirpage.
1218  *
1219  * A lu_dirpage is laid out as follows, where s = ldp_hash_start,
1220  * e = ldp_hash_end, f = ldp_flags, p = padding, and each "ent" is a
1221  * struct lu_dirent.  It has size up to LU_PAGE_SIZE. The ldp_hash_end
1222  * value is used as a cookie to request the next lu_dirpage in a
1223  * directory listing that spans multiple pages (two in this example):
1224  *   ________
1225  *  |        |
1226  * .|--------v-------   -----.
1227  * |s|e|f|p|ent|ent| ... |ent|
1228  * '--|--------------   -----'   Each PAGE contains a single
1229  *    '------.                   lu_dirpage.
1230  * .---------v-------   -----.
1231  * |s|e|f|p|ent| 0 | ... | 0 |
1232  * '-----------------   -----'
1233  *
1234  * However, on hosts where the native VM page size (PAGE_SIZE) is
1235  * larger than LU_PAGE_SIZE, a single host page may contain multiple
1236  * lu_dirpages. After reading the lu_dirpages from the MDS, the
1237  * ldp_hash_end of the first lu_dirpage refers to the one immediately
1238  * after it in the same PAGE (arrows simplified for brevity, but
1239  * in general e0==s1, e1==s2, etc.):
1240  *
1241  * .--------------------   -----.
1242  * |s0|e0|f0|p|ent|ent| ... |ent|
1243  * |---v----------------   -----|
1244  * |s1|e1|f1|p|ent|ent| ... |ent|
1245  * |---v----------------   -----|  Here, each PAGE contains
1246  *             ...                 multiple lu_dirpages.
1247  * |---v----------------   -----|
1248  * |s'|e'|f'|p|ent|ent| ... |ent|
1249  * '---|----------------   -----'
1250  *     v
1251  * .----------------------------.
1252  * |        next PAGE           |
1253  *
1254  * This structure is transformed into a single logical lu_dirpage as follows:
1255  *
1256  * - Replace e0 with e' so the request for the next lu_dirpage gets the page
1257  *   labeled 'next PAGE'.
1258  *
1259  * - Copy the LDF_COLLIDE flag from f' to f0 to correctly reflect whether
1260  *   a hash collision with the next page exists.
1261  *
1262  * - Adjust the lde_reclen of the ending entry of each lu_dirpage to span
1263  *   to the first entry of the next lu_dirpage.
1264  */
1265 #if PAGE_SIZE > LU_PAGE_SIZE
1266 static void mdc_adjust_dirpages(struct page **pages, int cfs_pgs, int lu_pgs)
1267 {
1268         int i;
1269
1270         for (i = 0; i < cfs_pgs; i++) {
1271                 struct lu_dirpage *dp = kmap(pages[i]);
1272                 struct lu_dirpage *first = dp;
1273                 struct lu_dirent *end_dirent = NULL;
1274                 struct lu_dirent *ent;
1275                 __u64 hash_end = dp->ldp_hash_end;
1276                 __u32 flags = dp->ldp_flags;
1277
1278                 while (--lu_pgs > 0) {
1279                         ent = lu_dirent_start(dp);
1280                         for (end_dirent = ent; ent != NULL;
1281                              end_dirent = ent, ent = lu_dirent_next(ent));
1282
1283                         /* Advance dp to next lu_dirpage. */
1284                         dp = (struct lu_dirpage *)((char *)dp + LU_PAGE_SIZE);
1285
1286                         /* Check if we've reached the end of the PAGE. */
1287                         if (!((unsigned long)dp & ~PAGE_MASK))
1288                                 break;
1289
1290                         /* Save the hash and flags of this lu_dirpage. */
1291                         hash_end = dp->ldp_hash_end;
1292                         flags = dp->ldp_flags;
1293
1294                         /* Check if lu_dirpage contains no entries. */
1295                         if (end_dirent == NULL)
1296                                 break;
1297
1298                         /* Enlarge the end entry lde_reclen from 0 to
1299                          * first entry of next lu_dirpage. */
1300                         LASSERT(le16_to_cpu(end_dirent->lde_reclen) == 0);
1301                         end_dirent->lde_reclen =
1302                                 cpu_to_le16((char *)(dp->ldp_entries) -
1303                                             (char *)end_dirent);
1304                 }
1305
1306                 first->ldp_hash_end = hash_end;
1307                 first->ldp_flags &= ~cpu_to_le32(LDF_COLLIDE);
1308                 first->ldp_flags |= flags & cpu_to_le32(LDF_COLLIDE);
1309
1310                 kunmap(pages[i]);
1311         }
1312         LASSERTF(lu_pgs == 0, "left = %d\n", lu_pgs);
1313 }
1314 #else
1315 #define mdc_adjust_dirpages(pages, cfs_pgs, lu_pgs) do {} while (0)
1316 #endif  /* PAGE_SIZE > LU_PAGE_SIZE */
1317
1318 /* parameters for readdir page */
1319 struct readpage_param {
1320         struct md_op_data       *rp_mod;
1321         __u64                   rp_off;
1322         int                     rp_hash64;
1323         struct obd_export       *rp_exp;
1324 };
1325
1326 /**
1327  * Read pages from server.
1328  *
1329  * Page in MDS_READPAGE RPC is packed in LU_PAGE_SIZE, and each page contains
1330  * a header lu_dirpage which describes the start/end hash, and whether this
1331  * page is empty (contains no dir entry) or hash collide with next page.
1332  * After client receives reply, several pages will be integrated into dir page
1333  * in PAGE_SIZE (if PAGE_SIZE greater than LU_PAGE_SIZE), and the
1334  * lu_dirpage for this integrated page will be adjusted.
1335  **/
1336 static int ll_mdc_read_page_remote(void *data, struct page *page0)
1337 {
1338         struct readpage_param *rp = data;
1339         struct page **page_pool;
1340         struct page *page;
1341         struct lu_dirpage *dp;
1342         struct md_op_data *op_data = rp->rp_mod;
1343         struct ptlrpc_request *req;
1344         int max_pages;
1345         struct inode *inode;
1346         struct lu_fid *fid;
1347         int rd_pgs = 0; /* number of pages actually read */
1348         int npages;
1349         int i;
1350         int rc;
1351         ENTRY;
1352
1353         max_pages = rp->rp_exp->exp_obd->u.cli.cl_max_pages_per_rpc;
1354         inode = op_data->op_data;
1355         fid = &op_data->op_fid1;
1356         LASSERT(inode != NULL);
1357
1358         OBD_ALLOC_PTR_ARRAY_LARGE(page_pool, max_pages);
1359         if (page_pool != NULL) {
1360                 page_pool[0] = page0;
1361         } else {
1362                 page_pool = &page0;
1363                 max_pages = 1;
1364         }
1365
1366         for (npages = 1; npages < max_pages; npages++) {
1367                 page = page_cache_alloc(inode->i_mapping);
1368                 if (page == NULL)
1369                         break;
1370                 page_pool[npages] = page;
1371         }
1372
1373         rc = mdc_getpage(rp->rp_exp, fid, rp->rp_off, page_pool, npages, &req);
1374         if (rc < 0) {
1375                 /* page0 is special, which was added into page cache early */
1376                 cfs_delete_from_page_cache(page0);
1377         } else {
1378                 int lu_pgs;
1379
1380                 rd_pgs = (req->rq_bulk->bd_nob_transferred + PAGE_SIZE - 1) >>
1381                         PAGE_SHIFT;
1382                 lu_pgs = req->rq_bulk->bd_nob_transferred >> LU_PAGE_SHIFT;
1383                 LASSERT(!(req->rq_bulk->bd_nob_transferred & ~LU_PAGE_MASK));
1384
1385                 CDEBUG(D_INODE, "read %d(%d) pages\n", rd_pgs, lu_pgs);
1386
1387                 mdc_adjust_dirpages(page_pool, rd_pgs, lu_pgs);
1388
1389                 SetPageUptodate(page0);
1390         }
1391         unlock_page(page0);
1392
1393         ptlrpc_req_finished(req);
1394         CDEBUG(D_CACHE, "read %d/%d pages\n", rd_pgs, npages);
1395         for (i = 1; i < npages; i++) {
1396                 unsigned long   offset;
1397                 __u64           hash;
1398                 int ret;
1399
1400                 page = page_pool[i];
1401
1402                 if (rc < 0 || i >= rd_pgs) {
1403                         put_page(page);
1404                         continue;
1405                 }
1406
1407                 SetPageUptodate(page);
1408
1409                 dp = kmap(page);
1410                 hash = le64_to_cpu(dp->ldp_hash_start);
1411                 kunmap(page);
1412
1413                 offset = hash_x_index(hash, rp->rp_hash64);
1414
1415                 prefetchw(&page->flags);
1416                 ret = add_to_page_cache_lru(page, inode->i_mapping, offset,
1417                                             GFP_KERNEL);
1418                 if (ret == 0)
1419                         unlock_page(page);
1420                 else
1421                         CDEBUG(D_VFSTRACE, "page %lu add to page cache failed:"
1422                                " rc = %d\n", offset, ret);
1423                 put_page(page);
1424         }
1425
1426         if (page_pool != &page0)
1427                 OBD_FREE_PTR_ARRAY_LARGE(page_pool, max_pages);
1428
1429         RETURN(rc);
1430 }
1431
1432 #ifdef HAVE_READ_CACHE_PAGE_WANTS_FILE
1433 static inline int mdc_read_folio_remote(struct file *file, struct folio *folio)
1434 {
1435         return ll_mdc_read_page_remote(file->private_data,
1436                                        folio_page(folio, 0));
1437 }
1438 #else
1439 #define mdc_read_folio_remote   ll_mdc_read_page_remote
1440 #endif
1441
1442 /**
1443  * Read dir page from cache first, if it can not find it, read it from
1444  * server and add into the cache.
1445  *
1446  * \param[in] exp       MDC export
1447  * \param[in] op_data   client MD stack parameters, transfering parameters
1448  *                      between different layers on client MD stack.
1449  * \param[in] mrinfo    callback required for ldlm lock enqueue during
1450  *                      read page
1451  * \param[in] hash_offset the hash offset of the page to be read
1452  * \param[in] ppage     the page to be read
1453  *
1454  * retval               = 0 get the page successfully
1455  *                      errno(<0) get the page failed
1456  */
1457 static int mdc_read_page(struct obd_export *exp, struct md_op_data *op_data,
1458                          struct md_readdir_info *mrinfo, __u64 hash_offset,
1459                          struct page **ppage)
1460 {
1461         struct lookup_intent    it = { .it_op = IT_READDIR };
1462         struct page             *page;
1463         struct inode            *dir = op_data->op_data;
1464         struct address_space    *mapping;
1465         struct lu_dirpage       *dp;
1466         __u64                   start = 0;
1467         __u64                   end = 0;
1468         struct lustre_handle    lockh;
1469         struct ptlrpc_request   *enq_req = NULL;
1470         struct readpage_param   rp_param;
1471         int rc;
1472
1473         ENTRY;
1474
1475         *ppage = NULL;
1476
1477         LASSERT(dir != NULL);
1478         mapping = dir->i_mapping;
1479
1480         rc = mdc_intent_lock(exp, op_data, &it, &enq_req,
1481                              mrinfo->mr_blocking_ast, 0);
1482         if (enq_req != NULL)
1483                 ptlrpc_req_finished(enq_req);
1484
1485         if (rc < 0) {
1486                 CERROR("%s: "DFID" lock enqueue fails: rc = %d\n",
1487                        exp->exp_obd->obd_name, PFID(&op_data->op_fid1), rc);
1488                 RETURN(rc);
1489         }
1490
1491         rc = 0;
1492         lockh.cookie = it.it_lock_handle;
1493         mdc_set_lock_data(exp, &lockh, dir, NULL);
1494
1495         rp_param.rp_off = hash_offset;
1496         rp_param.rp_hash64 = op_data->op_cli_flags & CLI_HASH64;
1497         page = mdc_page_locate(mapping, &rp_param.rp_off, &start, &end,
1498                                rp_param.rp_hash64);
1499         if (IS_ERR(page)) {
1500                 CERROR("%s: dir page locate: "DFID" at %llu: rc %ld\n",
1501                        exp->exp_obd->obd_name, PFID(&op_data->op_fid1),
1502                        rp_param.rp_off, PTR_ERR(page));
1503                 GOTO(out_unlock, rc = PTR_ERR(page));
1504         } else if (page != NULL) {
1505                 /*
1506                  * XXX nikita: not entirely correct handling of a corner case:
1507                  * suppose hash chain of entries with hash value HASH crosses
1508                  * border between pages P0 and P1. First both P0 and P1 are
1509                  * cached, seekdir() is called for some entry from the P0 part
1510                  * of the chain. Later P0 goes out of cache. telldir(HASH)
1511                  * happens and finds P1, as it starts with matching hash
1512                  * value. Remaining entries from P0 part of the chain are
1513                  * skipped. (Is that really a bug?)
1514                  *
1515                  * Possible solutions: 0. don't cache P1 is such case, handle
1516                  * it as an "overflow" page. 1. invalidate all pages at
1517                  * once. 2. use HASH|1 as an index for P1.
1518                  */
1519                 GOTO(hash_collision, page);
1520         }
1521
1522         rp_param.rp_exp = exp;
1523         rp_param.rp_mod = op_data;
1524         page = ll_read_cache_page(mapping,
1525                                   hash_x_index(rp_param.rp_off,
1526                                                rp_param.rp_hash64),
1527                                   mdc_read_folio_remote, &rp_param);
1528         if (IS_ERR(page)) {
1529                 CDEBUG(D_INFO, "%s: read cache page: "DFID" at %llu: %ld\n",
1530                        exp->exp_obd->obd_name, PFID(&op_data->op_fid1),
1531                        rp_param.rp_off, PTR_ERR(page));
1532                 GOTO(out_unlock, rc = PTR_ERR(page));
1533         }
1534
1535         wait_on_page_locked(page);
1536         (void)kmap(page);
1537         if (!PageUptodate(page)) {
1538                 CERROR("%s: page not updated: "DFID" at %llu: rc %d\n",
1539                        exp->exp_obd->obd_name, PFID(&op_data->op_fid1),
1540                        rp_param.rp_off, -5);
1541                 goto fail;
1542         }
1543         if (!PageChecked(page))
1544                 SetPageChecked(page);
1545         if (PageError(page)) {
1546                 CERROR("%s: page error: "DFID" at %llu: rc %d\n",
1547                        exp->exp_obd->obd_name, PFID(&op_data->op_fid1),
1548                        rp_param.rp_off, -5);
1549                 goto fail;
1550         }
1551
1552 hash_collision:
1553         dp = page_address(page);
1554         if (BITS_PER_LONG == 32 && rp_param.rp_hash64) {
1555                 start = le64_to_cpu(dp->ldp_hash_start) >> 32;
1556                 end   = le64_to_cpu(dp->ldp_hash_end) >> 32;
1557                 rp_param.rp_off = hash_offset >> 32;
1558         } else {
1559                 start = le64_to_cpu(dp->ldp_hash_start);
1560                 end   = le64_to_cpu(dp->ldp_hash_end);
1561                 rp_param.rp_off = hash_offset;
1562         }
1563         if (end == start) {
1564                 LASSERT(start == rp_param.rp_off);
1565                 CWARN("Page-wide hash collision: %#lx\n", (unsigned long)end);
1566 #if BITS_PER_LONG == 32
1567                 CWARN("Real page-wide hash collision at [%llu %llu] with "
1568                       "hash %llu\n", le64_to_cpu(dp->ldp_hash_start),
1569                       le64_to_cpu(dp->ldp_hash_end), hash_offset);
1570 #endif
1571
1572                 /*
1573                  * Fetch whole overflow chain...
1574                  *
1575                  * XXX not yet.
1576                  */
1577                 goto fail;
1578         }
1579         *ppage = page;
1580 out_unlock:
1581         ldlm_lock_decref(&lockh, it.it_lock_mode);
1582         return rc;
1583 fail:
1584         kunmap(page);
1585         mdc_release_page(page, 1);
1586         rc = -EIO;
1587         goto out_unlock;
1588 }
1589
1590 static int mdc_statfs_interpret(const struct lu_env *env,
1591                                 struct ptlrpc_request *req, void *args, int rc)
1592 {
1593         struct obd_info *oinfo = args;
1594         struct obd_statfs *osfs;
1595
1596         if (!rc) {
1597                 osfs = req_capsule_server_get(&req->rq_pill, &RMF_OBD_STATFS);
1598                 if (!osfs)
1599                         return -EPROTO;
1600
1601                 oinfo->oi_osfs = osfs;
1602
1603                 CDEBUG(D_CACHE, "blocks=%llu free=%llu avail=%llu "
1604                        "objects=%llu free=%llu state=%x\n",
1605                         osfs->os_blocks, osfs->os_bfree, osfs->os_bavail,
1606                         osfs->os_files, osfs->os_ffree, osfs->os_state);
1607         }
1608
1609         oinfo->oi_cb_up(oinfo, rc);
1610
1611         return rc;
1612 }
1613
1614 static int mdc_statfs_async(struct obd_export *exp,
1615                             struct obd_info *oinfo, time64_t max_age,
1616                             struct ptlrpc_request_set *unused)
1617 {
1618         struct ptlrpc_request *req;
1619         struct obd_info *aa;
1620
1621         req = ptlrpc_request_alloc_pack(class_exp2cliimp(exp), &RQF_MDS_STATFS,
1622                                         LUSTRE_MDS_VERSION, MDS_STATFS);
1623         if (req == NULL)
1624                 return -ENOMEM;
1625
1626         ptlrpc_request_set_replen(req);
1627         req->rq_interpret_reply = mdc_statfs_interpret;
1628
1629         aa = ptlrpc_req_async_args(aa, req);
1630         *aa = *oinfo;
1631
1632         ptlrpcd_add_req(req);
1633
1634         return 0;
1635 }
1636
1637 static int mdc_statfs(const struct lu_env *env,
1638                       struct obd_export *exp, struct obd_statfs *osfs,
1639                       time64_t max_age, __u32 flags)
1640 {
1641         struct obd_device *obd = class_exp2obd(exp);
1642         struct req_format *fmt;
1643         struct ptlrpc_request *req;
1644         struct obd_statfs *msfs;
1645         struct obd_import *imp, *imp0;
1646         int rc;
1647         ENTRY;
1648
1649         /*
1650          * Since the request might also come from lprocfs, so we need
1651          * sync this with client_disconnect_export Bug15684
1652          */
1653         with_imp_locked(obd, imp0, rc)
1654                 imp = class_import_get(imp0);
1655         if (rc)
1656                 RETURN(rc);
1657
1658         fmt = &RQF_MDS_STATFS;
1659         if ((exp_connect_flags2(exp) & OBD_CONNECT2_SUM_STATFS) &&
1660             (flags & OBD_STATFS_SUM))
1661                 fmt = &RQF_MDS_STATFS_NEW;
1662         req = ptlrpc_request_alloc_pack(imp, fmt, LUSTRE_MDS_VERSION,
1663                                         MDS_STATFS);
1664         if (req == NULL)
1665                 GOTO(output, rc = -ENOMEM);
1666         req->rq_allow_intr = 1;
1667
1668         if ((flags & OBD_STATFS_SUM) &&
1669             (exp_connect_flags2(exp) & OBD_CONNECT2_SUM_STATFS)) {
1670                 /* request aggregated states */
1671                 struct mdt_body *body;
1672
1673                 body = req_capsule_client_get(&req->rq_pill, &RMF_MDT_BODY);
1674                 if (body == NULL)
1675                         GOTO(out, rc = -EPROTO);
1676                 body->mbo_valid = OBD_MD_FLAGSTATFS;
1677         }
1678
1679         ptlrpc_request_set_replen(req);
1680
1681         if (flags & OBD_STATFS_NODELAY) {
1682                 /* procfs requests not want stay in wait for avoid deadlock */
1683                 req->rq_no_resend = 1;
1684                 req->rq_no_delay = 1;
1685         }
1686
1687         rc = ptlrpc_queue_wait(req);
1688         if (rc) {
1689                 /* check connection error first */
1690                 if (imp->imp_connect_error)
1691                         rc = imp->imp_connect_error;
1692                 GOTO(out, rc);
1693         }
1694
1695         msfs = req_capsule_server_get(&req->rq_pill, &RMF_OBD_STATFS);
1696         if (msfs == NULL)
1697                 GOTO(out, rc = -EPROTO);
1698
1699         *osfs = *msfs;
1700         EXIT;
1701 out:
1702         ptlrpc_req_finished(req);
1703 output:
1704         class_import_put(imp);
1705         return rc;
1706 }
1707
1708 static int mdc_ioc_fid2path(struct obd_export *exp, struct getinfo_fid2path *gf)
1709 {
1710         __u32 keylen, vallen;
1711         void *key;
1712         int rc;
1713
1714         if (gf->gf_pathlen < 2)
1715                 RETURN(-EOVERFLOW);
1716
1717         /* Key is KEY_FID2PATH + getinfo_fid2path description */
1718         keylen = round_up(sizeof(KEY_FID2PATH) + sizeof(*gf) +
1719                                 sizeof(struct lu_fid), 8);
1720         OBD_ALLOC(key, keylen);
1721         if (key == NULL)
1722                 RETURN(-ENOMEM);
1723         memcpy(key, KEY_FID2PATH, sizeof(KEY_FID2PATH));
1724         memcpy(key + round_up(sizeof(KEY_FID2PATH), 8), gf, sizeof(*gf));
1725         memcpy(key + round_up(sizeof(KEY_FID2PATH), 8) + sizeof(*gf),
1726                gf->gf_u.gf_root_fid, sizeof(struct lu_fid));
1727         CDEBUG(D_IOCTL, "path get "DFID" from %llu #%d\n",
1728                PFID(&gf->gf_fid), gf->gf_recno, gf->gf_linkno);
1729
1730         if (!fid_is_sane(&gf->gf_fid))
1731                 GOTO(out, rc = -EINVAL);
1732
1733         /* Val is struct getinfo_fid2path result plus path */
1734         vallen = sizeof(*gf) + gf->gf_pathlen;
1735
1736         rc = obd_get_info(NULL, exp, keylen, key, &vallen, gf);
1737         if (rc != 0 && rc != -EREMOTE)
1738                 GOTO(out, rc);
1739
1740         if (vallen <= sizeof(*gf))
1741                 GOTO(out, rc = -EPROTO);
1742         if (vallen > sizeof(*gf) + gf->gf_pathlen)
1743                 GOTO(out, rc = -EOVERFLOW);
1744
1745         CDEBUG(D_IOCTL, "path got "DFID" from %llu #%d: %.*s\n",
1746                PFID(&gf->gf_fid), gf->gf_recno, gf->gf_linkno,
1747                /* only log the first 512 characters of the path */
1748                512, gf->gf_u.gf_path);
1749
1750 out:
1751         OBD_FREE(key, keylen);
1752         return rc;
1753 }
1754
1755 static int mdc_ioc_hsm_progress(struct obd_export *exp,
1756                                 struct hsm_progress_kernel *hpk)
1757 {
1758         struct obd_import               *imp = class_exp2cliimp(exp);
1759         struct hsm_progress_kernel      *req_hpk;
1760         struct ptlrpc_request           *req;
1761         int                              rc;
1762         ENTRY;
1763
1764         req = ptlrpc_request_alloc_pack(imp, &RQF_MDS_HSM_PROGRESS,
1765                                         LUSTRE_MDS_VERSION, MDS_HSM_PROGRESS);
1766         if (req == NULL)
1767                 GOTO(out, rc = -ENOMEM);
1768
1769         mdc_pack_body(&req->rq_pill, NULL, 0, 0, -1, 0);
1770
1771         /* Copy hsm_progress struct */
1772         req_hpk = req_capsule_client_get(&req->rq_pill, &RMF_MDS_HSM_PROGRESS);
1773         if (req_hpk == NULL)
1774                 GOTO(out, rc = -EPROTO);
1775
1776         *req_hpk = *hpk;
1777         req_hpk->hpk_errval = lustre_errno_hton(hpk->hpk_errval);
1778
1779         ptlrpc_request_set_replen(req);
1780
1781         ptlrpc_get_mod_rpc_slot(req);
1782         rc = ptlrpc_queue_wait(req);
1783         ptlrpc_put_mod_rpc_slot(req);
1784
1785         GOTO(out, rc);
1786 out:
1787         ptlrpc_req_finished(req);
1788         return rc;
1789 }
1790 /**
1791  * Send hsm_ct_register to MDS
1792  *
1793  * \param[in]   imp             import
1794  * \param[in]   archive_count   if in bitmap format, it is the bitmap,
1795  *                              else it is the count of archive_ids
1796  * \param[in]   archives        if in bitmap format, it is NULL,
1797  *                              else it is archive_id lists
1798  */
1799 static int mdc_ioc_hsm_ct_register(struct obd_import *imp, __u32 archive_count,
1800                                    __u32 *archives)
1801 {
1802         struct ptlrpc_request *req;
1803         __u32 *archive_array;
1804         size_t archives_size;
1805         int rc;
1806         ENTRY;
1807
1808         req = ptlrpc_request_alloc(imp, &RQF_MDS_HSM_CT_REGISTER);
1809         if (req == NULL)
1810                 RETURN(-ENOMEM);
1811
1812         if (archives != NULL)
1813                 archives_size = sizeof(*archive_array) * archive_count;
1814         else
1815                 archives_size = sizeof(archive_count);
1816
1817         req_capsule_set_size(&req->rq_pill, &RMF_MDS_HSM_ARCHIVE,
1818                              RCL_CLIENT, archives_size);
1819
1820         rc = ptlrpc_request_pack(req, LUSTRE_MDS_VERSION, MDS_HSM_CT_REGISTER);
1821         if (rc) {
1822                 ptlrpc_request_free(req);
1823                 RETURN(-ENOMEM);
1824         }
1825
1826         mdc_pack_body(&req->rq_pill, NULL, 0, 0, -1, 0);
1827
1828         archive_array = req_capsule_client_get(&req->rq_pill,
1829                                                &RMF_MDS_HSM_ARCHIVE);
1830         if (archive_array == NULL)
1831                 GOTO(out, rc = -EPROTO);
1832
1833         if (archives != NULL)
1834                 memcpy(archive_array, archives, archives_size);
1835         else
1836                 *archive_array = archive_count;
1837
1838         ptlrpc_request_set_replen(req);
1839         req->rq_no_resend = 1;
1840
1841         rc = mdc_queue_wait(req);
1842         GOTO(out, rc);
1843 out:
1844         ptlrpc_req_finished(req);
1845         return rc;
1846 }
1847
1848 static int mdc_ioc_hsm_current_action(struct obd_export *exp,
1849                                       struct md_op_data *op_data)
1850 {
1851         struct hsm_current_action       *hca = op_data->op_data;
1852         struct hsm_current_action       *req_hca;
1853         struct ptlrpc_request           *req;
1854         int                              rc;
1855         ENTRY;
1856
1857         req = ptlrpc_request_alloc(class_exp2cliimp(exp),
1858                                    &RQF_MDS_HSM_ACTION);
1859         if (req == NULL)
1860                 RETURN(-ENOMEM);
1861
1862         rc = ptlrpc_request_pack(req, LUSTRE_MDS_VERSION, MDS_HSM_ACTION);
1863         if (rc) {
1864                 ptlrpc_request_free(req);
1865                 RETURN(rc);
1866         }
1867
1868         mdc_pack_body(&req->rq_pill, &op_data->op_fid1, 0, 0,
1869                       op_data->op_suppgids[0], 0);
1870
1871         ptlrpc_request_set_replen(req);
1872
1873         rc = mdc_queue_wait(req);
1874         if (rc)
1875                 GOTO(out, rc);
1876
1877         req_hca = req_capsule_server_get(&req->rq_pill,
1878                                          &RMF_MDS_HSM_CURRENT_ACTION);
1879         if (req_hca == NULL)
1880                 GOTO(out, rc = -EPROTO);
1881
1882         *hca = *req_hca;
1883
1884         EXIT;
1885 out:
1886         ptlrpc_req_finished(req);
1887         return rc;
1888 }
1889
1890 static int mdc_ioc_hsm_ct_unregister(struct obd_import *imp)
1891 {
1892         struct ptlrpc_request   *req;
1893         int                      rc;
1894         ENTRY;
1895
1896         req = ptlrpc_request_alloc_pack(imp, &RQF_MDS_HSM_CT_UNREGISTER,
1897                                         LUSTRE_MDS_VERSION,
1898                                         MDS_HSM_CT_UNREGISTER);
1899         if (req == NULL)
1900                 GOTO(out, rc = -ENOMEM);
1901
1902         mdc_pack_body(&req->rq_pill, NULL, 0, 0, -1, 0);
1903
1904         ptlrpc_request_set_replen(req);
1905
1906         rc = mdc_queue_wait(req);
1907         GOTO(out, rc);
1908 out:
1909         ptlrpc_req_finished(req);
1910         return rc;
1911 }
1912
1913 static int mdc_ioc_hsm_state_get(struct obd_export *exp,
1914                                  struct md_op_data *op_data)
1915 {
1916         struct hsm_user_state   *hus = op_data->op_data;
1917         struct hsm_user_state   *req_hus;
1918         struct ptlrpc_request   *req;
1919         int                      rc;
1920         ENTRY;
1921
1922         req = ptlrpc_request_alloc(class_exp2cliimp(exp),
1923                                    &RQF_MDS_HSM_STATE_GET);
1924         if (req == NULL)
1925                 RETURN(-ENOMEM);
1926
1927         rc = ptlrpc_request_pack(req, LUSTRE_MDS_VERSION, MDS_HSM_STATE_GET);
1928         if (rc != 0) {
1929                 ptlrpc_request_free(req);
1930                 RETURN(rc);
1931         }
1932
1933         mdc_pack_body(&req->rq_pill, &op_data->op_fid1, 0, 0,
1934                       op_data->op_suppgids[0], 0);
1935
1936         ptlrpc_request_set_replen(req);
1937
1938         rc = mdc_queue_wait(req);
1939         if (rc)
1940                 GOTO(out, rc);
1941
1942         req_hus = req_capsule_server_get(&req->rq_pill, &RMF_HSM_USER_STATE);
1943         if (req_hus == NULL)
1944                 GOTO(out, rc = -EPROTO);
1945
1946         *hus = *req_hus;
1947
1948         EXIT;
1949 out:
1950         ptlrpc_req_finished(req);
1951         return rc;
1952 }
1953
1954 static int mdc_ioc_hsm_state_set(struct obd_export *exp,
1955                                  struct md_op_data *op_data)
1956 {
1957         struct hsm_state_set    *hss = op_data->op_data;
1958         struct hsm_state_set    *req_hss;
1959         struct ptlrpc_request   *req;
1960         int                      rc;
1961         ENTRY;
1962
1963         req = ptlrpc_request_alloc(class_exp2cliimp(exp),
1964                                    &RQF_MDS_HSM_STATE_SET);
1965         if (req == NULL)
1966                 RETURN(-ENOMEM);
1967
1968         rc = ptlrpc_request_pack(req, LUSTRE_MDS_VERSION, MDS_HSM_STATE_SET);
1969         if (rc) {
1970                 ptlrpc_request_free(req);
1971                 RETURN(rc);
1972         }
1973
1974         mdc_pack_body(&req->rq_pill, &op_data->op_fid1, 0, 0,
1975                       op_data->op_suppgids[0], 0);
1976
1977         /* Copy states */
1978         req_hss = req_capsule_client_get(&req->rq_pill, &RMF_HSM_STATE_SET);
1979         if (req_hss == NULL)
1980                 GOTO(out, rc = -EPROTO);
1981         *req_hss = *hss;
1982
1983         ptlrpc_request_set_replen(req);
1984
1985         ptlrpc_get_mod_rpc_slot(req);
1986         rc = ptlrpc_queue_wait(req);
1987         ptlrpc_put_mod_rpc_slot(req);
1988
1989         GOTO(out, rc);
1990 out:
1991         ptlrpc_req_finished(req);
1992         return rc;
1993 }
1994
1995 /* For RESTORE and RELEASE the mdt will take EX lock on the file layout.
1996  * So we can use early cancel on client side locks for that resource.
1997  */
1998 static inline int mdc_hsm_request_lock_to_cancel(struct obd_export *exp,
1999                                                  struct hsm_user_request *hur,
2000                                                  struct list_head *cancels)
2001 {
2002         struct hsm_user_item *hui = &hur->hur_user_item[0];
2003         struct hsm_request *req_hr = &hur->hur_request;
2004         int count = 0;
2005         int i;
2006
2007         if (req_hr->hr_action != HUA_RESTORE &&
2008             req_hr->hr_action != HUA_RELEASE)
2009                 return 0;
2010
2011         for (i = 0; i < req_hr->hr_itemcount; i++, hui++) {
2012                 if (!fid_is_sane(&hui->hui_fid))
2013                         continue;
2014                 count += mdc_resource_get_unused(exp, &hui->hui_fid, cancels,
2015                                                  LCK_EX, MDS_INODELOCK_LAYOUT);
2016         }
2017
2018         return count;
2019 }
2020
2021 static int mdc_ioc_hsm_request(struct obd_export *exp,
2022                                struct hsm_user_request *hur)
2023 {
2024         struct obd_import *imp = class_exp2cliimp(exp);
2025         struct ptlrpc_request *req;
2026         struct hsm_request *req_hr;
2027         struct hsm_user_item *req_hui;
2028         char *req_opaque;
2029         LIST_HEAD(cancels);
2030         int count;
2031         int rc;
2032         ENTRY;
2033
2034         req = ptlrpc_request_alloc(imp, &RQF_MDS_HSM_REQUEST);
2035         if (req == NULL)
2036                 RETURN(-ENOMEM);
2037
2038         req_capsule_set_size(&req->rq_pill, &RMF_MDS_HSM_USER_ITEM, RCL_CLIENT,
2039                              hur->hur_request.hr_itemcount
2040                              * sizeof(struct hsm_user_item));
2041         req_capsule_set_size(&req->rq_pill, &RMF_GENERIC_DATA, RCL_CLIENT,
2042                              hur->hur_request.hr_data_len);
2043
2044         rc = ptlrpc_request_pack(req, LUSTRE_MDS_VERSION, MDS_HSM_REQUEST);
2045         if (rc) {
2046                 ptlrpc_request_free(req);
2047                 RETURN(rc);
2048         }
2049
2050         /* Cancel existing locks */
2051         count = mdc_hsm_request_lock_to_cancel(exp, hur, &cancels);
2052         ldlm_cli_cancel_list(&cancels, count, NULL, 0);
2053         mdc_pack_body(&req->rq_pill, NULL, 0, 0, -1, 0);
2054
2055         /* Copy hsm_request struct */
2056         req_hr = req_capsule_client_get(&req->rq_pill, &RMF_MDS_HSM_REQUEST);
2057         if (req_hr == NULL)
2058                 GOTO(out, rc = -EPROTO);
2059         *req_hr = hur->hur_request;
2060
2061         /* Copy hsm_user_item structs */
2062         req_hui = req_capsule_client_get(&req->rq_pill, &RMF_MDS_HSM_USER_ITEM);
2063         if (req_hui == NULL)
2064                 GOTO(out, rc = -EPROTO);
2065         memcpy(req_hui, hur->hur_user_item,
2066                hur->hur_request.hr_itemcount * sizeof(struct hsm_user_item));
2067
2068         /* Copy opaque field */
2069         req_opaque = req_capsule_client_get(&req->rq_pill, &RMF_GENERIC_DATA);
2070         if (req_opaque == NULL)
2071                 GOTO(out, rc = -EPROTO);
2072         memcpy(req_opaque, hur_data(hur), hur->hur_request.hr_data_len);
2073
2074         ptlrpc_request_set_replen(req);
2075
2076         ptlrpc_get_mod_rpc_slot(req);
2077         rc = ptlrpc_queue_wait(req);
2078         ptlrpc_put_mod_rpc_slot(req);
2079
2080         GOTO(out, rc);
2081
2082 out:
2083         ptlrpc_req_finished(req);
2084         return rc;
2085 }
2086
2087 static int mdc_ioc_hsm_ct_start(struct obd_export *exp,
2088                                 struct lustre_kernelcomm *lk);
2089
2090 static int mdc_quotactl(struct obd_device *unused, struct obd_export *exp,
2091                         struct obd_quotactl *oqctl)
2092 {
2093         struct ptlrpc_request *req;
2094         struct obd_quotactl *oqc;
2095         int rc;
2096         ENTRY;
2097
2098         req = ptlrpc_request_alloc(class_exp2cliimp(exp), &RQF_MDS_QUOTACTL);
2099         if (req == NULL)
2100                 RETURN(-ENOMEM);
2101
2102
2103         if (LUSTRE_Q_CMD_IS_POOL(oqctl->qc_cmd))
2104                 req_capsule_set_size(&req->rq_pill,
2105                                      &RMF_OBD_QUOTACTL,
2106                                      RCL_CLIENT,
2107                                      sizeof(*oqc) + LOV_MAXPOOLNAME + 1);
2108
2109         rc = ptlrpc_request_pack(req, LUSTRE_MDS_VERSION,
2110                                  MDS_QUOTACTL);
2111         if (rc) {
2112                 ptlrpc_request_free(req);
2113                 RETURN(rc);
2114         }
2115
2116         oqc = req_capsule_client_get(&req->rq_pill, &RMF_OBD_QUOTACTL);
2117         QCTL_COPY(oqc, oqctl);
2118
2119         ptlrpc_request_set_replen(req);
2120         ptlrpc_at_set_req_timeout(req);
2121
2122         rc = ptlrpc_queue_wait(req);
2123         if (rc) {
2124                 CERROR("%s: ptlrpc_queue_wait failed: rc = %d\n",
2125                        exp->exp_obd->obd_name, rc);
2126                 GOTO(out, rc);
2127         }
2128
2129         if (req->rq_repmsg &&
2130             (oqc = req_capsule_server_get(&req->rq_pill, &RMF_OBD_QUOTACTL))) {
2131                 QCTL_COPY(oqctl, oqc);
2132         } else if (!rc) {
2133                 rc = -EPROTO;
2134                 CERROR("%s: cannot unpack obd_quotactl: rc = %d\n",
2135                         exp->exp_obd->obd_name, rc);
2136         }
2137 out:
2138         ptlrpc_req_finished(req);
2139
2140         RETURN(rc);
2141 }
2142
2143 static int mdc_ioc_swap_layouts(struct obd_export *exp,
2144                                 struct md_op_data *op_data)
2145 {
2146         LIST_HEAD(cancels);
2147         struct ptlrpc_request   *req;
2148         int                      rc, count;
2149         struct mdc_swap_layouts *msl, *payload;
2150         ENTRY;
2151
2152         msl = op_data->op_data;
2153
2154         /* When the MDT will get the MDS_SWAP_LAYOUTS RPC the
2155          * first thing it will do is to cancel the 2 layout
2156          * locks held by this client.
2157          * So the client must cancel its layout locks on the 2 fids
2158          * with the request RPC to avoid extra RPC round trips.
2159          */
2160         count = mdc_resource_get_unused(exp, &op_data->op_fid1, &cancels,
2161                                         LCK_EX, MDS_INODELOCK_LAYOUT |
2162                                         MDS_INODELOCK_XATTR);
2163         count += mdc_resource_get_unused(exp, &op_data->op_fid2, &cancels,
2164                                          LCK_EX, MDS_INODELOCK_LAYOUT |
2165                                          MDS_INODELOCK_XATTR);
2166
2167         req = ptlrpc_request_alloc(class_exp2cliimp(exp),
2168                                    &RQF_MDS_SWAP_LAYOUTS);
2169         if (req == NULL) {
2170                 ldlm_lock_list_put(&cancels, l_bl_ast, count);
2171                 RETURN(-ENOMEM);
2172         }
2173
2174         rc = mdc_prep_elc_req(exp, req, MDS_SWAP_LAYOUTS, &cancels, count);
2175         if (rc) {
2176                 ptlrpc_request_free(req);
2177                 RETURN(rc);
2178         }
2179
2180         mdc_swap_layouts_pack(&req->rq_pill, op_data);
2181
2182         payload = req_capsule_client_get(&req->rq_pill, &RMF_SWAP_LAYOUTS);
2183         LASSERT(payload);
2184
2185         *payload = *msl;
2186
2187         ptlrpc_request_set_replen(req);
2188
2189         rc = ptlrpc_queue_wait(req);
2190         if (rc)
2191                 GOTO(out, rc);
2192         EXIT;
2193
2194 out:
2195         ptlrpc_req_finished(req);
2196         return rc;
2197 }
2198
2199 static int mdc_iocontrol(unsigned int cmd, struct obd_export *exp, int len,
2200                          void *karg, void __user *uarg)
2201 {
2202         struct obd_device *obd = exp->exp_obd;
2203         struct obd_ioctl_data *data;
2204         struct obd_import *imp = obd->u.cli.cl_import;
2205         int rc;
2206
2207         ENTRY;
2208         CDEBUG(D_IOCTL, "%s: cmd=%x len=%u karg=%pK uarg=%pK\n",
2209                obd->obd_name, cmd, len, karg, uarg);
2210
2211         /* handle commands that do not need @karg first */
2212         switch (cmd) {
2213         case LL_IOC_GET_CONNECT_FLAGS:
2214                 if (copy_to_user(uarg, exp_connect_flags_ptr(exp),
2215                                  sizeof(*exp_connect_flags_ptr(exp))))
2216                         RETURN(-EFAULT);
2217                 RETURN(0);
2218         }
2219
2220         if (unlikely(karg == NULL))
2221                 RETURN(OBD_IOC_ERROR(obd->obd_name, cmd, "karg=NULL", -EINVAL));
2222         data = karg;
2223
2224         if (!try_module_get(THIS_MODULE)) {
2225                 CERROR("%s: cannot get module '%s'\n", obd->obd_name,
2226                        module_name(THIS_MODULE));
2227                 return -EINVAL;
2228         }
2229         switch (cmd) {
2230         case OBD_IOC_FID2PATH:
2231                 rc = mdc_ioc_fid2path(exp, karg);
2232                 GOTO(out, rc);
2233         case LL_IOC_HSM_CT_START:
2234                 rc = mdc_ioc_hsm_ct_start(exp, karg);
2235                 /* ignore if it was already registered on this MDS. */
2236                 if (rc == -EEXIST)
2237                         rc = 0;
2238                 GOTO(out, rc);
2239         case LL_IOC_HSM_PROGRESS:
2240                 rc = mdc_ioc_hsm_progress(exp, karg);
2241                 GOTO(out, rc);
2242         case LL_IOC_HSM_STATE_GET:
2243                 rc = mdc_ioc_hsm_state_get(exp, karg);
2244                 GOTO(out, rc);
2245         case LL_IOC_HSM_STATE_SET:
2246                 rc = mdc_ioc_hsm_state_set(exp, karg);
2247                 GOTO(out, rc);
2248         case LL_IOC_HSM_ACTION:
2249                 rc = mdc_ioc_hsm_current_action(exp, karg);
2250                 GOTO(out, rc);
2251         case LL_IOC_HSM_REQUEST:
2252                 rc = mdc_ioc_hsm_request(exp, karg);
2253                 GOTO(out, rc);
2254         case OBD_IOC_CLIENT_RECOVER:
2255                 rc = ptlrpc_recover_import(imp, data->ioc_inlbuf1, 0);
2256                 if (rc < 0)
2257                         GOTO(out, rc);
2258                 GOTO(out, rc = 0);
2259 #ifdef IOC_OSC_SET_ACTIVE
2260         case_OBD_IOC_DEPRECATED_FT(IOC_OSC_SET_ACTIVE, obd->obd_name, 2, 17);
2261 #endif
2262         case OBD_IOC_SET_ACTIVE:
2263                 rc = ptlrpc_set_import_active(imp, data->ioc_offset);
2264                 GOTO(out, rc);
2265         /*
2266          * Normally IOC_OBD_STATFS, OBD_IOC_QUOTACTL iocontrol are handled by
2267          * LMV instead of MDC. But when the cluster is upgraded from 1.8,
2268          * there'd be no LMV layer thus we might be called here. Eventually
2269          * this code should be removed.
2270          * bz20731, LU-592.
2271          */
2272         case IOC_OBD_STATFS: {
2273                 struct obd_statfs stat_buf = {0};
2274
2275                 if (*((__u32 *) data->ioc_inlbuf2) != 0)
2276                         GOTO(out, rc = -ENODEV);
2277
2278                 /* copy UUID */
2279                 if (copy_to_user(data->ioc_pbuf2, obd2cli_tgt(obd),
2280                                  min((int)data->ioc_plen2,
2281                                      (int)sizeof(struct obd_uuid))))
2282                         GOTO(out, rc = -EFAULT);
2283
2284                 rc = mdc_statfs(NULL, obd->obd_self_export, &stat_buf,
2285                                 ktime_get_seconds() - OBD_STATFS_CACHE_SECONDS,
2286                                 0);
2287                 if (rc != 0)
2288                         GOTO(out, rc);
2289
2290                 if (copy_to_user(data->ioc_pbuf1, &stat_buf,
2291                                      min((int) data->ioc_plen1,
2292                                          (int) sizeof(stat_buf))))
2293                         GOTO(out, rc = -EFAULT);
2294
2295                 GOTO(out, rc = 0);
2296         }
2297         case OBD_IOC_QUOTACTL: {
2298                 struct if_quotactl *qctl = karg;
2299                 struct obd_quotactl *oqctl;
2300
2301                 OBD_ALLOC_PTR(oqctl);
2302                 if (oqctl == NULL)
2303                         GOTO(out, rc = -ENOMEM);
2304
2305                 QCTL_COPY(oqctl, qctl);
2306                 rc = obd_quotactl(exp, oqctl);
2307                 if (rc == 0) {
2308                         QCTL_COPY(qctl, oqctl);
2309                         qctl->qc_valid = QC_MDTIDX;
2310                         qctl->obd_uuid = obd->u.cli.cl_target_uuid;
2311                 }
2312
2313                 OBD_FREE_PTR(oqctl);
2314                 GOTO(out, rc);
2315         }
2316         case LL_IOC_LOV_SWAP_LAYOUTS:
2317                 rc = mdc_ioc_swap_layouts(exp, karg);
2318                 GOTO(out, rc);
2319         default:
2320                 rc = OBD_IOC_ERROR(obd->obd_name, cmd, "unrecognized", -ENOTTY);
2321                 break;
2322         }
2323 out:
2324         module_put(THIS_MODULE);
2325
2326         return rc;
2327 }
2328
2329 static int mdc_get_info_rpc(struct obd_export *exp,
2330                             u32 keylen, void *key,
2331                             u32 vallen, void *val)
2332 {
2333         struct obd_import      *imp = class_exp2cliimp(exp);
2334         struct ptlrpc_request  *req;
2335         char                   *tmp;
2336         int                     rc = -EINVAL;
2337         ENTRY;
2338
2339         req = ptlrpc_request_alloc(imp, &RQF_MDS_GET_INFO);
2340         if (req == NULL)
2341                 RETURN(-ENOMEM);
2342
2343         req_capsule_set_size(&req->rq_pill, &RMF_GETINFO_KEY,
2344                              RCL_CLIENT, keylen);
2345         req_capsule_set_size(&req->rq_pill, &RMF_GETINFO_VALLEN,
2346                              RCL_CLIENT, sizeof(vallen));
2347
2348         rc = ptlrpc_request_pack(req, LUSTRE_MDS_VERSION, MDS_GET_INFO);
2349         if (rc) {
2350                 ptlrpc_request_free(req);
2351                 RETURN(rc);
2352         }
2353
2354         tmp = req_capsule_client_get(&req->rq_pill, &RMF_GETINFO_KEY);
2355         memcpy(tmp, key, keylen);
2356         tmp = req_capsule_client_get(&req->rq_pill, &RMF_GETINFO_VALLEN);
2357         memcpy(tmp, &vallen, sizeof(vallen));
2358
2359         req_capsule_set_size(&req->rq_pill, &RMF_GETINFO_VAL,
2360                              RCL_SERVER, vallen);
2361         ptlrpc_request_set_replen(req);
2362
2363         /* if server failed to resolve FID, and OI scrub not able to fix it, it
2364          * will return -EINPROGRESS, ptlrpc_queue_wait() will keep retrying,
2365          * set request interruptible to avoid deadlock.
2366          */
2367         if (KEY_IS(KEY_FID2PATH))
2368                 req->rq_allow_intr = 1;
2369
2370         rc = ptlrpc_queue_wait(req);
2371         /* -EREMOTE means the get_info result is partial, and it needs to
2372          * continue on another MDT, see fid2path part in lmv_iocontrol */
2373         if (rc == 0 || rc == -EREMOTE) {
2374                 tmp = req_capsule_server_get(&req->rq_pill, &RMF_GETINFO_VAL);
2375                 memcpy(val, tmp, vallen);
2376                 if (req_capsule_rep_need_swab(&req->rq_pill)) {
2377                         if (KEY_IS(KEY_FID2PATH))
2378                                 lustre_swab_fid2path(val);
2379                 }
2380         }
2381         ptlrpc_req_finished(req);
2382
2383         RETURN(rc);
2384 }
2385
2386 static void lustre_swab_hai(struct hsm_action_item *h)
2387 {
2388         __swab32s(&h->hai_len);
2389         __swab32s(&h->hai_action);
2390         lustre_swab_lu_fid(&h->hai_fid);
2391         lustre_swab_lu_fid(&h->hai_dfid);
2392         __swab64s(&h->hai_cookie);
2393         __swab64s(&h->hai_extent.offset);
2394         __swab64s(&h->hai_extent.length);
2395         __swab64s(&h->hai_gid);
2396 }
2397
2398 static void lustre_swab_hal(struct hsm_action_list *h)
2399 {
2400         struct hsm_action_item  *hai;
2401         __u32                    i;
2402
2403         __swab32s(&h->hal_version);
2404         __swab32s(&h->hal_count);
2405         __swab32s(&h->hal_archive_id);
2406         __swab64s(&h->hal_flags);
2407         hai = hai_first(h);
2408         for (i = 0; i < h->hal_count; i++, hai = hai_next(hai))
2409                 lustre_swab_hai(hai);
2410 }
2411
2412 static void lustre_swab_kuch(struct kuc_hdr *l)
2413 {
2414         __swab16s(&l->kuc_magic);
2415         /* __u8 l->kuc_transport */
2416         __swab16s(&l->kuc_msgtype);
2417         __swab16s(&l->kuc_msglen);
2418 }
2419
2420 static int mdc_ioc_hsm_ct_start(struct obd_export *exp,
2421                                 struct lustre_kernelcomm *lk)
2422 {
2423         struct obd_import *imp = class_exp2cliimp(exp);
2424         int rc = 0;
2425
2426         if (lk->lk_group != KUC_GRP_HSM) {
2427                 CERROR("Bad copytool group %d\n", lk->lk_group);
2428                 return -EINVAL;
2429         }
2430
2431         CDEBUG(D_HSM, "CT start r%d w%d u%d g%d f%#x\n", lk->lk_rfd, lk->lk_wfd,
2432                lk->lk_uid, lk->lk_group, lk->lk_flags);
2433
2434         if (lk->lk_flags & LK_FLG_STOP) {
2435                 /* Unregister with the coordinator */
2436                 rc = mdc_ioc_hsm_ct_unregister(imp);
2437         } else {
2438                 __u32 *archives = NULL;
2439
2440                 if ((lk->lk_flags & LK_FLG_DATANR) && lk->lk_data_count > 0)
2441                         archives = lk->lk_data;
2442
2443                 rc = mdc_ioc_hsm_ct_register(imp, lk->lk_data_count, archives);
2444         }
2445
2446         return rc;
2447 }
2448
2449 /**
2450  * Send a message to any listening copytools
2451  * @param val KUC message (kuc_hdr + hsm_action_list)
2452  * @param len total length of message
2453  */
2454 static int mdc_hsm_copytool_send(const struct obd_uuid *uuid,
2455                                  size_t len, void *val)
2456 {
2457         struct kuc_hdr          *lh = (struct kuc_hdr *)val;
2458         struct hsm_action_list  *hal = (struct hsm_action_list *)(lh + 1);
2459         int                      rc;
2460         ENTRY;
2461
2462         if (len < sizeof(*lh) + sizeof(*hal)) {
2463                 CERROR("Short HSM message %zu < %zu\n", len,
2464                        sizeof(*lh) + sizeof(*hal));
2465                 RETURN(-EPROTO);
2466         }
2467         if (lh->kuc_magic == __swab16(KUC_MAGIC)) {
2468                 lustre_swab_kuch(lh);
2469                 lustre_swab_hal(hal);
2470         } else if (lh->kuc_magic != KUC_MAGIC) {
2471                 CERROR("Bad magic %x!=%x\n", lh->kuc_magic, KUC_MAGIC);
2472                 RETURN(-EPROTO);
2473         }
2474
2475         CDEBUG(D_HSM, " Received message mg=%x t=%d m=%d l=%d actions=%d "
2476                "on %s\n",
2477                lh->kuc_magic, lh->kuc_transport, lh->kuc_msgtype,
2478                lh->kuc_msglen, hal->hal_count, hal->hal_fsname);
2479
2480         /* Broadcast to HSM listeners */
2481         rc = libcfs_kkuc_group_put(uuid, KUC_GRP_HSM, lh);
2482
2483         RETURN(rc);
2484 }
2485
2486 /**
2487  * callback function passed to kuc for re-registering each HSM copytool
2488  * running on MDC, after MDT shutdown/recovery.
2489  * @param data copytool registration data
2490  * @param cb_arg callback argument (obd_import)
2491  */
2492 static int mdc_hsm_ct_reregister(void *data, void *cb_arg)
2493 {
2494         struct obd_import *imp = (struct obd_import *)cb_arg;
2495         struct kkuc_ct_data *kcd = data;
2496         __u32 *archives = NULL;
2497         int rc;
2498
2499         if (kcd == NULL ||
2500             (kcd->kcd_magic != KKUC_CT_DATA_ARRAY_MAGIC &&
2501              kcd->kcd_magic != KKUC_CT_DATA_BITMAP_MAGIC))
2502                 return -EPROTO;
2503
2504         if (kcd->kcd_magic == KKUC_CT_DATA_BITMAP_MAGIC) {
2505                 CDEBUG(D_HA, "%s: recover copytool registration to MDT "
2506                        "(archive=%#x)\n", imp->imp_obd->obd_name,
2507                        kcd->kcd_nr_archives);
2508         } else {
2509                 CDEBUG(D_HA, "%s: recover copytool registration to MDT "
2510                        "(archive nr = %u)\n",
2511                        imp->imp_obd->obd_name, kcd->kcd_nr_archives);
2512                 if (kcd->kcd_nr_archives != 0)
2513                         archives = kcd->kcd_archives;
2514         }
2515
2516         rc = mdc_ioc_hsm_ct_register(imp, kcd->kcd_nr_archives, archives);
2517         /* ignore error if the copytool is already registered */
2518         return (rc == -EEXIST) ? 0 : rc;
2519 }
2520
2521 /**
2522  * Re-establish all kuc contexts with MDT
2523  * after MDT shutdown/recovery.
2524  */
2525 static int mdc_kuc_reregister(struct obd_import *imp)
2526 {
2527         /* re-register HSM agents */
2528         return libcfs_kkuc_group_foreach(&imp->imp_obd->obd_uuid, KUC_GRP_HSM,
2529                                          mdc_hsm_ct_reregister, imp);
2530 }
2531
2532 static int mdc_set_info_async(const struct lu_env *env,
2533                               struct obd_export *exp,
2534                               u32 keylen, void *key,
2535                               u32 vallen, void *val,
2536                               struct ptlrpc_request_set *set)
2537 {
2538         struct obd_import       *imp = class_exp2cliimp(exp);
2539         int                      rc;
2540         ENTRY;
2541
2542         if (KEY_IS(KEY_READ_ONLY)) {
2543                 if (vallen != sizeof(int))
2544                         RETURN(-EINVAL);
2545
2546                 spin_lock(&imp->imp_lock);
2547                 if (*((int *)val)) {
2548                         imp->imp_connect_flags_orig |= OBD_CONNECT_RDONLY;
2549                         imp->imp_connect_data.ocd_connect_flags |=
2550                                                         OBD_CONNECT_RDONLY;
2551                 } else {
2552                         imp->imp_connect_flags_orig &= ~OBD_CONNECT_RDONLY;
2553                         imp->imp_connect_data.ocd_connect_flags &=
2554                                                         ~OBD_CONNECT_RDONLY;
2555                 }
2556                 spin_unlock(&imp->imp_lock);
2557
2558                 rc = do_set_info_async(imp, MDS_SET_INFO, LUSTRE_MDS_VERSION,
2559                                        keylen, key, vallen, val, set);
2560                 RETURN(rc);
2561         }
2562         if (KEY_IS(KEY_CHANGELOG_CLEAR)) {
2563                 rc = do_set_info_async(imp, MDS_SET_INFO, LUSTRE_MDS_VERSION,
2564                                        keylen, key, vallen, val, set);
2565                 RETURN(rc);
2566         }
2567         if (KEY_IS(KEY_HSM_COPYTOOL_SEND)) {
2568                 rc = mdc_hsm_copytool_send(&imp->imp_obd->obd_uuid, vallen,
2569                                            val);
2570                 RETURN(rc);
2571         }
2572
2573         if (KEY_IS(KEY_DEFAULT_EASIZE)) {
2574                 __u32 *default_easize = val;
2575
2576                 exp->exp_obd->u.cli.cl_default_mds_easize = *default_easize;
2577                 RETURN(0);
2578         }
2579
2580         rc = osc_set_info_async(env, exp, keylen, key, vallen, val, set);
2581         RETURN(rc);
2582 }
2583
2584 static int mdc_get_info(const struct lu_env *env, struct obd_export *exp,
2585                         __u32 keylen, void *key, __u32 *vallen, void *val)
2586 {
2587         int rc = -EINVAL;
2588
2589         if (KEY_IS(KEY_MAX_EASIZE)) {
2590                 __u32 mdsize, *max_easize;
2591
2592                 if (*vallen != sizeof(int))
2593                         RETURN(-EINVAL);
2594                 mdsize = *(__u32 *)val;
2595                 if (mdsize > exp->exp_obd->u.cli.cl_max_mds_easize)
2596                         exp->exp_obd->u.cli.cl_max_mds_easize = mdsize;
2597                 max_easize = val;
2598                 *max_easize = exp->exp_obd->u.cli.cl_max_mds_easize;
2599                 RETURN(0);
2600         } else if (KEY_IS(KEY_DEFAULT_EASIZE)) {
2601                 __u32 *default_easize;
2602
2603                 if (*vallen != sizeof(int))
2604                         RETURN(-EINVAL);
2605                 default_easize = val;
2606                 *default_easize = exp->exp_obd->u.cli.cl_default_mds_easize;
2607                 RETURN(0);
2608         } else if (KEY_IS(KEY_CONN_DATA)) {
2609                 struct obd_import *imp = class_exp2cliimp(exp);
2610                 struct obd_connect_data *data = val;
2611
2612                 if (*vallen != sizeof(*data))
2613                         RETURN(-EINVAL);
2614
2615                 *data = imp->imp_connect_data;
2616                 RETURN(0);
2617         } else if (KEY_IS(KEY_TGT_COUNT)) {
2618                 *((__u32 *)val) = 1;
2619                 RETURN(0);
2620         }
2621
2622         rc = mdc_get_info_rpc(exp, keylen, key, *vallen, val);
2623
2624         RETURN(rc);
2625 }
2626
2627 static int mdc_fsync(struct obd_export *exp, const struct lu_fid *fid,
2628                      struct ptlrpc_request **request)
2629 {
2630         struct ptlrpc_request *req;
2631         int                    rc;
2632         ENTRY;
2633
2634         *request = NULL;
2635         req = ptlrpc_request_alloc(class_exp2cliimp(exp), &RQF_MDS_SYNC);
2636         if (req == NULL)
2637                 RETURN(-ENOMEM);
2638
2639         rc = ptlrpc_request_pack(req, LUSTRE_MDS_VERSION, MDS_SYNC);
2640         if (rc) {
2641                 ptlrpc_request_free(req);
2642                 RETURN(rc);
2643         }
2644
2645         mdc_pack_body(&req->rq_pill, fid, 0, 0, -1, 0);
2646
2647         ptlrpc_request_set_replen(req);
2648
2649         rc = ptlrpc_queue_wait(req);
2650         if (rc)
2651                 ptlrpc_req_finished(req);
2652         else
2653                 *request = req;
2654         RETURN(rc);
2655 }
2656
2657 struct mdc_rmfid_args {
2658         int *mra_rcs;
2659         int mra_nr;
2660 };
2661
2662 static int mdc_rmfid_interpret(const struct lu_env *env,
2663                                struct ptlrpc_request *req,
2664                                void *args, int rc)
2665 {
2666         struct mdc_rmfid_args *aa;
2667         int *rcs, size;
2668         ENTRY;
2669
2670         if (!rc) {
2671                 aa = ptlrpc_req_async_args(aa, req);
2672
2673                 size = req_capsule_get_size(&req->rq_pill, &RMF_RCS,
2674                                             RCL_SERVER);
2675                 LASSERT(size == sizeof(int) * aa->mra_nr);
2676                 rcs = req_capsule_server_get(&req->rq_pill, &RMF_RCS);
2677                 LASSERT(rcs);
2678                 LASSERT(aa->mra_rcs);
2679                 LASSERT(aa->mra_nr);
2680                 memcpy(aa->mra_rcs, rcs, size);
2681         }
2682
2683         RETURN(rc);
2684 }
2685
2686 static int mdc_rmfid(struct obd_export *exp, struct fid_array *fa,
2687                      int *rcs, struct ptlrpc_request_set *set)
2688 {
2689         struct ptlrpc_request *req;
2690         struct mdc_rmfid_args *aa;
2691         struct mdt_body *b;
2692         struct lu_fid *tmp;
2693         int rc, flen;
2694         ENTRY;
2695
2696         req = ptlrpc_request_alloc(class_exp2cliimp(exp), &RQF_MDS_RMFID);
2697         if (req == NULL)
2698                 RETURN(-ENOMEM);
2699
2700         flen = fa->fa_nr * sizeof(struct lu_fid);
2701         req_capsule_set_size(&req->rq_pill, &RMF_FID_ARRAY,
2702                              RCL_CLIENT, flen);
2703         req_capsule_set_size(&req->rq_pill, &RMF_FID_ARRAY,
2704                              RCL_SERVER, flen);
2705         req_capsule_set_size(&req->rq_pill, &RMF_RCS,
2706                              RCL_SERVER, fa->fa_nr * sizeof(__u32));
2707         rc = ptlrpc_request_pack(req, LUSTRE_MDS_VERSION, MDS_RMFID);
2708         if (rc) {
2709                 ptlrpc_request_free(req);
2710                 RETURN(rc);
2711         }
2712         tmp = req_capsule_client_get(&req->rq_pill, &RMF_FID_ARRAY);
2713         memcpy(tmp, fa->fa_fids, flen);
2714
2715         mdc_pack_body(&req->rq_pill, NULL, 0, 0, -1, 0);
2716         b = req_capsule_client_get(&req->rq_pill, &RMF_MDT_BODY);
2717         b->mbo_ctime = ktime_get_real_seconds();
2718
2719         ptlrpc_request_set_replen(req);
2720
2721         LASSERT(rcs);
2722         aa = ptlrpc_req_async_args(aa, req);
2723         aa->mra_rcs = rcs;
2724         aa->mra_nr = fa->fa_nr;
2725         req->rq_interpret_reply = mdc_rmfid_interpret;
2726
2727         ptlrpc_set_add_req(set, req);
2728         ptlrpc_check_set(NULL, set);
2729
2730         RETURN(rc);
2731 }
2732
2733 static int mdc_import_event(struct obd_device *obd, struct obd_import *imp,
2734                             enum obd_import_event event)
2735 {
2736         struct client_obd *cli = &obd->u.cli;
2737         int rc = 0;
2738
2739         LASSERT(imp->imp_obd == obd);
2740
2741         switch (event) {
2742         case IMP_EVENT_DISCON:
2743                 spin_lock(&cli->cl_loi_list_lock);
2744                 cli->cl_avail_grant = 0;
2745                 cli->cl_lost_grant = 0;
2746                 spin_unlock(&cli->cl_loi_list_lock);
2747                 break;
2748         case IMP_EVENT_INACTIVE:
2749                 /*
2750                  * Flush current sequence to make client obtain new one
2751                  * from server in case of disconnect/reconnect.
2752                  */
2753                 down_read(&cli->cl_seq_rwsem);
2754                 if (cli->cl_seq)
2755                         seq_client_flush(cli->cl_seq);
2756                 up_read(&cli->cl_seq_rwsem);
2757
2758                 rc = obd_notify_observer(obd, obd, OBD_NOTIFY_INACTIVE);
2759                 break;
2760         case IMP_EVENT_INVALIDATE: {
2761                 struct ldlm_namespace *ns = obd->obd_namespace;
2762                 struct lu_env *env;
2763                 __u16 refcheck;
2764
2765                 ldlm_namespace_cleanup(ns, LDLM_FL_LOCAL_ONLY);
2766
2767                 env = cl_env_get(&refcheck);
2768                 if (!IS_ERR(env)) {
2769                         /* Reset grants. All pages go to failing rpcs due to
2770                          * the invalid import.
2771                          */
2772                         osc_io_unplug(env, cli, NULL);
2773
2774                         cfs_hash_for_each_nolock(ns->ns_rs_hash,
2775                                                  osc_ldlm_resource_invalidate,
2776                                                  env, 0);
2777                         cl_env_put(env, &refcheck);
2778                         ldlm_namespace_cleanup(ns, LDLM_FL_LOCAL_ONLY);
2779                 } else {
2780                         rc = PTR_ERR(env);
2781                 }
2782                 break;
2783         }
2784         case IMP_EVENT_ACTIVE:
2785                 rc = obd_notify_observer(obd, obd, OBD_NOTIFY_ACTIVE);
2786                 /* redo the kuc registration after reconnecting */
2787                 if (rc == 0)
2788                         rc = mdc_kuc_reregister(imp);
2789                 break;
2790         case IMP_EVENT_OCD: {
2791                 struct obd_connect_data *ocd = &imp->imp_connect_data;
2792
2793                 if (OCD_HAS_FLAG(ocd, GRANT))
2794                         osc_init_grant(cli, ocd);
2795
2796                 md_init_ea_size(obd->obd_self_export, ocd->ocd_max_easize, 0);
2797                 rc = obd_notify_observer(obd, obd, OBD_NOTIFY_OCD);
2798                 break;
2799         }
2800         case IMP_EVENT_DEACTIVATE:
2801         case IMP_EVENT_ACTIVATE:
2802                 break;
2803         default:
2804                 CERROR("Unknown import event %x\n", event);
2805                 LBUG();
2806         }
2807         RETURN(rc);
2808 }
2809
2810 int mdc_fid_alloc(const struct lu_env *env, struct obd_export *exp,
2811                   struct lu_fid *fid, struct md_op_data *op_data)
2812 {
2813         struct client_obd *cli = &exp->exp_obd->u.cli;
2814         int rc = -EIO;
2815
2816         ENTRY;
2817
2818         down_read(&cli->cl_seq_rwsem);
2819         if (cli->cl_seq)
2820                 rc = seq_client_alloc_fid(env, cli->cl_seq, fid);
2821         up_read(&cli->cl_seq_rwsem);
2822
2823         RETURN(rc);
2824 }
2825
2826 static struct obd_uuid *mdc_get_uuid(struct obd_export *exp)
2827 {
2828         struct client_obd *cli = &exp->exp_obd->u.cli;
2829         return &cli->cl_target_uuid;
2830 }
2831
2832 /**
2833  * Determine whether the lock can be canceled before replaying it during
2834  * recovery, non zero value will be return if the lock can be canceled,
2835  * or zero returned for not
2836  */
2837 static int mdc_cancel_weight(struct ldlm_lock *lock)
2838 {
2839         if (lock->l_resource->lr_type != LDLM_IBITS)
2840                 RETURN(0);
2841
2842         /* FIXME: if we ever get into a situation where there are too many
2843          * opened files with open locks on a single node, then we really
2844          * should replay these open locks to reget it */
2845         if (lock->l_policy_data.l_inodebits.bits & MDS_INODELOCK_OPEN)
2846                 RETURN(0);
2847
2848         /* Special case for DoM locks, cancel only unused and granted locks */
2849         if (ldlm_has_dom(lock) &&
2850             (lock->l_granted_mode != lock->l_req_mode ||
2851              osc_ldlm_weigh_ast(lock) != 0))
2852                 RETURN(0);
2853
2854         RETURN(1);
2855 }
2856
2857 static int mdc_resource_inode_free(struct ldlm_resource *res)
2858 {
2859         if (res->lr_lvb_inode)
2860                 res->lr_lvb_inode = NULL;
2861
2862         return 0;
2863 }
2864
2865 static struct ldlm_valblock_ops inode_lvbo = {
2866         .lvbo_free = mdc_resource_inode_free
2867 };
2868
2869 static int mdc_llog_init(struct obd_device *obd)
2870 {
2871         struct obd_llog_group   *olg = &obd->obd_olg;
2872         struct llog_ctxt        *ctxt;
2873         int                      rc;
2874
2875         ENTRY;
2876
2877         rc = llog_setup(NULL, obd, olg, LLOG_CHANGELOG_REPL_CTXT, obd,
2878                         &llog_client_ops);
2879         if (rc < 0)
2880                 RETURN(rc);
2881
2882         ctxt = llog_group_get_ctxt(olg, LLOG_CHANGELOG_REPL_CTXT);
2883         llog_initiator_connect(ctxt);
2884         llog_ctxt_put(ctxt);
2885
2886         RETURN(0);
2887 }
2888
2889 static void mdc_llog_finish(struct obd_device *obd)
2890 {
2891         struct llog_ctxt *ctxt;
2892
2893         ENTRY;
2894
2895         ctxt = llog_get_context(obd, LLOG_CHANGELOG_REPL_CTXT);
2896         if (ctxt != NULL)
2897                 llog_cleanup(NULL, ctxt);
2898
2899         EXIT;
2900 }
2901
2902 int mdc_setup(struct obd_device *obd, struct lustre_cfg *cfg)
2903 {
2904         int rc;
2905
2906         ENTRY;
2907
2908         rc = osc_setup_common(obd, cfg);
2909         if (rc < 0)
2910                 RETURN(rc);
2911
2912         rc = mdc_tunables_init(obd);
2913         if (rc)
2914                 GOTO(err_osc_cleanup, rc);
2915
2916         obd->u.cli.cl_dom_min_inline_repsize = MDC_DOM_DEF_INLINE_REPSIZE;
2917         obd->u.cli.cl_lsom_update = true;
2918
2919         ns_register_cancel(obd->obd_namespace, mdc_cancel_weight);
2920
2921         obd->obd_namespace->ns_lvbo = &inode_lvbo;
2922
2923         rc = mdc_llog_init(obd);
2924         if (rc) {
2925                 CERROR("%s: failed to setup llogging subsystems: rc = %d\n",
2926                        obd->obd_name, rc);
2927                 GOTO(err_llog_cleanup, rc);
2928         }
2929
2930         rc = mdc_changelog_cdev_init(obd);
2931         if (rc) {
2932                 CERROR("%s: failed to setup changelog char device: rc = %d\n",
2933                        obd->obd_name, rc);
2934                 GOTO(err_changelog_cleanup, rc);
2935         }
2936
2937         RETURN(rc);
2938
2939 err_changelog_cleanup:
2940         mdc_llog_finish(obd);
2941 err_llog_cleanup:
2942         lprocfs_free_md_stats(obd);
2943         ptlrpc_lprocfs_unregister_obd(obd);
2944 err_osc_cleanup:
2945         osc_cleanup_common(obd);
2946         return rc;
2947 }
2948
2949 /* Initialize the default and maximum LOV EA sizes.  This allows
2950  * us to make MDS RPCs with large enough reply buffers to hold a default
2951  * sized EA without having to calculate this (via a call into the
2952  * LOV + OSCs) each time we make an RPC.  The maximum size is also tracked
2953  * but not used to avoid wastefully vmalloc()'ing large reply buffers when
2954  * a large number of stripes is possible.  If a larger reply buffer is
2955  * required it will be reallocated in the ptlrpc layer due to overflow.
2956  */
2957 static int mdc_init_ea_size(struct obd_export *exp, __u32 easize,
2958                             __u32 def_easize)
2959 {
2960         struct obd_device *obd = exp->exp_obd;
2961         struct client_obd *cli = &obd->u.cli;
2962         ENTRY;
2963
2964         if (cli->cl_max_mds_easize < easize)
2965                 cli->cl_max_mds_easize = easize;
2966
2967         if (cli->cl_default_mds_easize < def_easize)
2968                 cli->cl_default_mds_easize = def_easize;
2969
2970         RETURN(0);
2971 }
2972
2973 static int mdc_precleanup(struct obd_device *obd)
2974 {
2975         ENTRY;
2976
2977         osc_precleanup_common(obd);
2978
2979         mdc_changelog_cdev_finish(obd);
2980         mdc_llog_finish(obd);
2981         lprocfs_free_md_stats(obd);
2982         ptlrpc_lprocfs_unregister_obd(obd);
2983
2984         RETURN(0);
2985 }
2986
2987 static int mdc_cleanup(struct obd_device *obd)
2988 {
2989         struct client_obd *cli = &obd->u.cli;
2990         LASSERT(cli->cl_mod_rpcs_in_flight == 0);
2991         return osc_cleanup_common(obd);
2992 }
2993
2994 static const struct obd_ops mdc_obd_ops = {
2995         .o_owner            = THIS_MODULE,
2996         .o_setup            = mdc_setup,
2997         .o_precleanup       = mdc_precleanup,
2998         .o_cleanup          = mdc_cleanup,
2999         .o_add_conn         = client_import_add_conn,
3000         .o_del_conn         = client_import_del_conn,
3001         .o_connect          = client_connect_import,
3002         .o_reconnect        = osc_reconnect,
3003         .o_disconnect       = osc_disconnect,
3004         .o_iocontrol        = mdc_iocontrol,
3005         .o_set_info_async   = mdc_set_info_async,
3006         .o_statfs           = mdc_statfs,
3007         .o_statfs_async     = mdc_statfs_async,
3008         .o_fid_init         = client_fid_init,
3009         .o_fid_fini         = client_fid_fini,
3010         .o_fid_alloc        = mdc_fid_alloc,
3011         .o_import_event     = mdc_import_event,
3012         .o_get_info         = mdc_get_info,
3013         .o_get_uuid         = mdc_get_uuid,
3014         .o_quotactl         = mdc_quotactl,
3015 };
3016
3017 static const struct md_ops mdc_md_ops = {
3018         .m_get_root         = mdc_get_root,
3019         .m_null_inode       = mdc_null_inode,
3020         .m_close            = mdc_close,
3021         .m_create           = mdc_create,
3022         .m_enqueue          = mdc_enqueue,
3023         .m_getattr          = mdc_getattr,
3024         .m_getattr_name     = mdc_getattr_name,
3025         .m_intent_lock      = mdc_intent_lock,
3026         .m_link             = mdc_link,
3027         .m_rename           = mdc_rename,
3028         .m_setattr          = mdc_setattr,
3029         .m_setxattr         = mdc_setxattr,
3030         .m_getxattr         = mdc_getxattr,
3031         .m_fsync                = mdc_fsync,
3032         .m_file_resync          = mdc_file_resync,
3033         .m_read_page            = mdc_read_page,
3034         .m_unlink           = mdc_unlink,
3035         .m_cancel_unused    = mdc_cancel_unused,
3036         .m_init_ea_size     = mdc_init_ea_size,
3037         .m_set_lock_data    = mdc_set_lock_data,
3038         .m_lock_match       = mdc_lock_match,
3039         .m_get_lustre_md    = mdc_get_lustre_md,
3040         .m_free_lustre_md   = mdc_free_lustre_md,
3041         .m_set_open_replay_data = mdc_set_open_replay_data,
3042         .m_clear_open_replay_data = mdc_clear_open_replay_data,
3043         .m_intent_getattr_async = mdc_intent_getattr_async,
3044         .m_revalidate_lock      = mdc_revalidate_lock,
3045         .m_rmfid                = mdc_rmfid,
3046         .m_batch_create         = cli_batch_create,
3047         .m_batch_stop           = cli_batch_stop,
3048         .m_batch_flush          = cli_batch_flush,
3049         .m_batch_add            = mdc_batch_add,
3050 };
3051
3052 dev_t mdc_changelog_dev;
3053 struct class *mdc_changelog_class;
3054 static int __init mdc_init(void)
3055 {
3056         int rc = 0;
3057         rc = alloc_chrdev_region(&mdc_changelog_dev, 0,
3058                                  MDC_CHANGELOG_DEV_COUNT,
3059                                  MDC_CHANGELOG_DEV_NAME);
3060         if (rc)
3061                 return rc;
3062
3063         mdc_changelog_class = class_create(THIS_MODULE, MDC_CHANGELOG_DEV_NAME);
3064         if (IS_ERR(mdc_changelog_class)) {
3065                 rc = PTR_ERR(mdc_changelog_class);
3066                 goto out_dev;
3067         }
3068
3069         rc = class_register_type(&mdc_obd_ops, &mdc_md_ops, true,
3070                                  LUSTRE_MDC_NAME, &mdc_device_type);
3071         if (rc)
3072                 goto out_class;
3073
3074         return 0;
3075
3076 out_class:
3077         class_destroy(mdc_changelog_class);
3078 out_dev:
3079         unregister_chrdev_region(mdc_changelog_dev, MDC_CHANGELOG_DEV_COUNT);
3080         return rc;
3081 }
3082
3083 static void __exit mdc_exit(void)
3084 {
3085         class_unregister_type(LUSTRE_MDC_NAME);
3086         class_destroy(mdc_changelog_class);
3087         unregister_chrdev_region(mdc_changelog_dev, MDC_CHANGELOG_DEV_COUNT);
3088         idr_destroy(&mdc_changelog_minor_idr);
3089 }
3090
3091 MODULE_AUTHOR("OpenSFS, Inc. <http://www.lustre.org/>");
3092 MODULE_DESCRIPTION("Lustre Metadata Client");
3093 MODULE_VERSION(LUSTRE_VERSION_STRING);
3094 MODULE_LICENSE("GPL");
3095
3096 module_init(mdc_init);
3097 module_exit(mdc_exit);