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(-ENOTSUPP);
 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 = current_cap().cap[0];
 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 (OBD_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                 /* Since now, mod is accessed through open_req only,
1034                  * thus close req does not keep a reference on mod anymore. */
1035                 obd_mod_put(mod);
1036         }
1037         *request = req;
1038
1039         RETURN(rc < 0 ? rc : saved_rc);
1040 }
1041
1042 static int mdc_getpage(struct obd_export *exp, const struct lu_fid *fid,
1043                        u64 offset, struct page **pages, int npages,
1044                        struct ptlrpc_request **request)
1045 {
1046         struct ptlrpc_request   *req;
1047         struct ptlrpc_bulk_desc *desc;
1048         int                      i;
1049         int                      resends = 0;
1050         int                      rc;
1051         ENTRY;
1052
1053         *request = NULL;
1054
1055 restart_bulk:
1056         req = ptlrpc_request_alloc(class_exp2cliimp(exp), &RQF_MDS_READPAGE);
1057         if (req == NULL)
1058                 RETURN(-ENOMEM);
1059
1060         rc = ptlrpc_request_pack(req, LUSTRE_MDS_VERSION, MDS_READPAGE);
1061         if (rc) {
1062                 ptlrpc_request_free(req);
1063                 RETURN(rc);
1064         }
1065
1066         req->rq_request_portal = MDS_READPAGE_PORTAL;
1067         ptlrpc_at_set_req_timeout(req);
1068
1069         desc = ptlrpc_prep_bulk_imp(req, npages, 1,
1070                                     PTLRPC_BULK_PUT_SINK,
1071                                     MDS_BULK_PORTAL,
1072                                     &ptlrpc_bulk_kiov_pin_ops);
1073         if (desc == NULL) {
1074                 ptlrpc_req_finished(req);
1075                 RETURN(-ENOMEM);
1076         }
1077
1078         /* NB req now owns desc and will free it when it gets freed */
1079         for (i = 0; i < npages; i++)
1080                 desc->bd_frag_ops->add_kiov_frag(desc, pages[i], 0,
1081                                                  PAGE_SIZE);
1082
1083         mdc_readdir_pack(&req->rq_pill, offset, PAGE_SIZE * npages, fid);
1084
1085         ptlrpc_request_set_replen(req);
1086         rc = ptlrpc_queue_wait(req);
1087         if (rc) {
1088                 ptlrpc_req_finished(req);
1089                 if (rc != -ETIMEDOUT)
1090                         RETURN(rc);
1091
1092                 resends++;
1093                 if (!client_should_resend(resends, &exp->exp_obd->u.cli)) {
1094                         CERROR("%s: too many resend retries: rc = %d\n",
1095                                exp->exp_obd->obd_name, -EIO);
1096                         RETURN(-EIO);
1097                 }
1098
1099                 /* If a signal interrupts then the timeout returned will
1100                  * not be zero. In that case return -EINTR
1101                  */
1102                 if (msleep_interruptible(resends * 1000))
1103                         RETURN(-EINTR);
1104
1105                 goto restart_bulk;
1106         }
1107
1108         rc = sptlrpc_cli_unwrap_bulk_read(req, req->rq_bulk,
1109                                           req->rq_bulk->bd_nob_transferred);
1110         if (rc < 0) {
1111                 ptlrpc_req_finished(req);
1112                 RETURN(rc);
1113         }
1114
1115         if (req->rq_bulk->bd_nob_transferred & ~LU_PAGE_MASK) {
1116                 CERROR("%s: unexpected bytes transferred: %d (%ld expected)\n",
1117                        exp->exp_obd->obd_name, req->rq_bulk->bd_nob_transferred,
1118                        PAGE_SIZE * npages);
1119                 ptlrpc_req_finished(req);
1120                 RETURN(-EPROTO);
1121         }
1122
1123         *request = req;
1124         RETURN(0);
1125 }
1126
1127 static void mdc_release_page(struct page *page, int remove)
1128 {
1129         if (remove) {
1130                 lock_page(page);
1131                 if (likely(page->mapping != NULL))
1132                         cfs_delete_from_page_cache(page);
1133                 unlock_page(page);
1134         }
1135         put_page(page);
1136 }
1137
1138 static struct page *mdc_page_locate(struct address_space *mapping, __u64 *hash,
1139                                     __u64 *start, __u64 *end, int hash64)
1140 {
1141         /*
1142          * Complement of hash is used as an index so that
1143          * radix_tree_gang_lookup() can be used to find a page with starting
1144          * hash _smaller_ than one we are looking for.
1145          */
1146         unsigned long offset = hash_x_index(*hash, hash64);
1147         struct page *page;
1148         unsigned long flags;
1149         int found;
1150
1151         ll_xa_lock_irqsave(&mapping->i_pages, flags);
1152         found = radix_tree_gang_lookup(&mapping->page_tree,
1153                                        (void **)&page, offset, 1);
1154         if (found > 0 && !ll_xa_is_value(page)) {
1155                 struct lu_dirpage *dp;
1156
1157                 get_page(page);
1158                 ll_xa_unlock_irqrestore(&mapping->i_pages, flags);
1159                 /*
1160                  * In contrast to find_lock_page() we are sure that directory
1161                  * page cannot be truncated (while DLM lock is held) and,
1162                  * hence, can avoid restart.
1163                  *
1164                  * In fact, page cannot be locked here at all, because
1165                  * mdc_read_page_remote does synchronous io.
1166                  */
1167                 wait_on_page_locked(page);
1168                 if (PageUptodate(page)) {
1169                         dp = kmap(page);
1170                         if (BITS_PER_LONG == 32 && hash64) {
1171                                 *start = le64_to_cpu(dp->ldp_hash_start) >> 32;
1172                                 *end   = le64_to_cpu(dp->ldp_hash_end) >> 32;
1173                                 *hash  = *hash >> 32;
1174                         } else {
1175                                 *start = le64_to_cpu(dp->ldp_hash_start);
1176                                 *end   = le64_to_cpu(dp->ldp_hash_end);
1177                         }
1178                         if (unlikely(*start == 1 && *hash == 0))
1179                                 *hash = *start;
1180                         else
1181                                 LASSERTF(*start <= *hash, "start = %#llx"
1182                                          ",end = %#llx,hash = %#llx\n",
1183                                          *start, *end, *hash);
1184                         CDEBUG(D_VFSTRACE, "offset %lx [%#llx %#llx],"
1185                               " hash %#llx\n", offset, *start, *end, *hash);
1186                         if (*hash > *end) {
1187                                 kunmap(page);
1188                                 mdc_release_page(page, 0);
1189                                 page = NULL;
1190                         } else if (*end != *start && *hash == *end) {
1191                                 /*
1192                                  * upon hash collision, remove this page,
1193                                  * otherwise put page reference, and
1194                                  * mdc_read_page_remote() will issue RPC to
1195                                  * fetch the page we want.
1196                                  */
1197                                 kunmap(page);
1198                                 mdc_release_page(page,
1199                                     le32_to_cpu(dp->ldp_flags) & LDF_COLLIDE);
1200                                 page = NULL;
1201                         }
1202                 } else {
1203                         put_page(page);
1204                         page = ERR_PTR(-EIO);
1205                 }
1206         } else {
1207                 ll_xa_unlock_irqrestore(&mapping->i_pages, flags);
1208                 page = NULL;
1209         }
1210         return page;
1211 }
1212
1213 /*
1214  * Adjust a set of pages, each page containing an array of lu_dirpages,
1215  * so that each page can be used as a single logical lu_dirpage.
1216  *
1217  * A lu_dirpage is laid out as follows, where s = ldp_hash_start,
1218  * e = ldp_hash_end, f = ldp_flags, p = padding, and each "ent" is a
1219  * struct lu_dirent.  It has size up to LU_PAGE_SIZE. The ldp_hash_end
1220  * value is used as a cookie to request the next lu_dirpage in a
1221  * directory listing that spans multiple pages (two in this example):
1222  *   ________
1223  *  |        |
1224  * .|--------v-------   -----.
1225  * |s|e|f|p|ent|ent| ... |ent|
1226  * '--|--------------   -----'   Each PAGE contains a single
1227  *    '------.                   lu_dirpage.
1228  * .---------v-------   -----.
1229  * |s|e|f|p|ent| 0 | ... | 0 |
1230  * '-----------------   -----'
1231  *
1232  * However, on hosts where the native VM page size (PAGE_SIZE) is
1233  * larger than LU_PAGE_SIZE, a single host page may contain multiple
1234  * lu_dirpages. After reading the lu_dirpages from the MDS, the
1235  * ldp_hash_end of the first lu_dirpage refers to the one immediately
1236  * after it in the same PAGE (arrows simplified for brevity, but
1237  * in general e0==s1, e1==s2, etc.):
1238  *
1239  * .--------------------   -----.
1240  * |s0|e0|f0|p|ent|ent| ... |ent|
1241  * |---v----------------   -----|
1242  * |s1|e1|f1|p|ent|ent| ... |ent|
1243  * |---v----------------   -----|  Here, each PAGE contains
1244  *             ...                 multiple lu_dirpages.
1245  * |---v----------------   -----|
1246  * |s'|e'|f'|p|ent|ent| ... |ent|
1247  * '---|----------------   -----'
1248  *     v
1249  * .----------------------------.
1250  * |        next PAGE           |
1251  *
1252  * This structure is transformed into a single logical lu_dirpage as follows:
1253  *
1254  * - Replace e0 with e' so the request for the next lu_dirpage gets the page
1255  *   labeled 'next PAGE'.
1256  *
1257  * - Copy the LDF_COLLIDE flag from f' to f0 to correctly reflect whether
1258  *   a hash collision with the next page exists.
1259  *
1260  * - Adjust the lde_reclen of the ending entry of each lu_dirpage to span
1261  *   to the first entry of the next lu_dirpage.
1262  */
1263 #if PAGE_SIZE > LU_PAGE_SIZE
1264 static void mdc_adjust_dirpages(struct page **pages, int cfs_pgs, int lu_pgs)
1265 {
1266         int i;
1267
1268         for (i = 0; i < cfs_pgs; i++) {
1269                 struct lu_dirpage *dp = kmap(pages[i]);
1270                 struct lu_dirpage *first = dp;
1271                 struct lu_dirent *end_dirent = NULL;
1272                 struct lu_dirent *ent;
1273                 __u64 hash_end = dp->ldp_hash_end;
1274                 __u32 flags = dp->ldp_flags;
1275
1276                 while (--lu_pgs > 0) {
1277                         ent = lu_dirent_start(dp);
1278                         for (end_dirent = ent; ent != NULL;
1279                              end_dirent = ent, ent = lu_dirent_next(ent));
1280
1281                         /* Advance dp to next lu_dirpage. */
1282                         dp = (struct lu_dirpage *)((char *)dp + LU_PAGE_SIZE);
1283
1284                         /* Check if we've reached the end of the PAGE. */
1285                         if (!((unsigned long)dp & ~PAGE_MASK))
1286                                 break;
1287
1288                         /* Save the hash and flags of this lu_dirpage. */
1289                         hash_end = dp->ldp_hash_end;
1290                         flags = dp->ldp_flags;
1291
1292                         /* Check if lu_dirpage contains no entries. */
1293                         if (end_dirent == NULL)
1294                                 break;
1295
1296                         /* Enlarge the end entry lde_reclen from 0 to
1297                          * first entry of next lu_dirpage. */
1298                         LASSERT(le16_to_cpu(end_dirent->lde_reclen) == 0);
1299                         end_dirent->lde_reclen =
1300                                 cpu_to_le16((char *)(dp->ldp_entries) -
1301                                             (char *)end_dirent);
1302                 }
1303
1304                 first->ldp_hash_end = hash_end;
1305                 first->ldp_flags &= ~cpu_to_le32(LDF_COLLIDE);
1306                 first->ldp_flags |= flags & cpu_to_le32(LDF_COLLIDE);
1307
1308                 kunmap(pages[i]);
1309         }
1310         LASSERTF(lu_pgs == 0, "left = %d\n", lu_pgs);
1311 }
1312 #else
1313 #define mdc_adjust_dirpages(pages, cfs_pgs, lu_pgs) do {} while (0)
1314 #endif  /* PAGE_SIZE > LU_PAGE_SIZE */
1315
1316 /* parameters for readdir page */
1317 struct readpage_param {
1318         struct md_op_data       *rp_mod;
1319         __u64                   rp_off;
1320         int                     rp_hash64;
1321         struct obd_export       *rp_exp;
1322 };
1323
1324 /**
1325  * Read pages from server.
1326  *
1327  * Page in MDS_READPAGE RPC is packed in LU_PAGE_SIZE, and each page contains
1328  * a header lu_dirpage which describes the start/end hash, and whether this
1329  * page is empty (contains no dir entry) or hash collide with next page.
1330  * After client receives reply, several pages will be integrated into dir page
1331  * in PAGE_SIZE (if PAGE_SIZE greater than LU_PAGE_SIZE), and the
1332  * lu_dirpage for this integrated page will be adjusted.
1333  **/
1334 static int ll_mdc_read_page_remote(void *data, struct page *page0)
1335 {
1336         struct readpage_param *rp = data;
1337         struct page **page_pool;
1338         struct page *page;
1339         struct lu_dirpage *dp;
1340         struct md_op_data *op_data = rp->rp_mod;
1341         struct ptlrpc_request *req;
1342         int max_pages;
1343         struct inode *inode;
1344         struct lu_fid *fid;
1345         int rd_pgs = 0; /* number of pages actually read */
1346         int npages;
1347         int i;
1348         int rc;
1349         ENTRY;
1350
1351         max_pages = rp->rp_exp->exp_obd->u.cli.cl_max_pages_per_rpc;
1352         inode = op_data->op_data;
1353         fid = &op_data->op_fid1;
1354         LASSERT(inode != NULL);
1355
1356         OBD_ALLOC_PTR_ARRAY_LARGE(page_pool, max_pages);
1357         if (page_pool != NULL) {
1358                 page_pool[0] = page0;
1359         } else {
1360                 page_pool = &page0;
1361                 max_pages = 1;
1362         }
1363
1364         for (npages = 1; npages < max_pages; npages++) {
1365                 page = page_cache_alloc(inode->i_mapping);
1366                 if (page == NULL)
1367                         break;
1368                 page_pool[npages] = page;
1369         }
1370
1371         rc = mdc_getpage(rp->rp_exp, fid, rp->rp_off, page_pool, npages, &req);
1372         if (rc < 0) {
1373                 /* page0 is special, which was added into page cache early */
1374                 cfs_delete_from_page_cache(page0);
1375         } else {
1376                 int lu_pgs;
1377
1378                 rd_pgs = (req->rq_bulk->bd_nob_transferred + PAGE_SIZE - 1) >>
1379                         PAGE_SHIFT;
1380                 lu_pgs = req->rq_bulk->bd_nob_transferred >> LU_PAGE_SHIFT;
1381                 LASSERT(!(req->rq_bulk->bd_nob_transferred & ~LU_PAGE_MASK));
1382
1383                 CDEBUG(D_INODE, "read %d(%d) pages\n", rd_pgs, lu_pgs);
1384
1385                 mdc_adjust_dirpages(page_pool, rd_pgs, lu_pgs);
1386
1387                 SetPageUptodate(page0);
1388         }
1389         unlock_page(page0);
1390
1391         ptlrpc_req_finished(req);
1392         CDEBUG(D_CACHE, "read %d/%d pages\n", rd_pgs, npages);
1393         for (i = 1; i < npages; i++) {
1394                 unsigned long   offset;
1395                 __u64           hash;
1396                 int ret;
1397
1398                 page = page_pool[i];
1399
1400                 if (rc < 0 || i >= rd_pgs) {
1401                         put_page(page);
1402                         continue;
1403                 }
1404
1405                 SetPageUptodate(page);
1406
1407                 dp = kmap(page);
1408                 hash = le64_to_cpu(dp->ldp_hash_start);
1409                 kunmap(page);
1410
1411                 offset = hash_x_index(hash, rp->rp_hash64);
1412
1413                 prefetchw(&page->flags);
1414                 ret = add_to_page_cache_lru(page, inode->i_mapping, offset,
1415                                             GFP_KERNEL);
1416                 if (ret == 0)
1417                         unlock_page(page);
1418                 else
1419                         CDEBUG(D_VFSTRACE, "page %lu add to page cache failed:"
1420                                " rc = %d\n", offset, ret);
1421                 put_page(page);
1422         }
1423
1424         if (page_pool != &page0)
1425                 OBD_FREE_PTR_ARRAY_LARGE(page_pool, max_pages);
1426
1427         RETURN(rc);
1428 }
1429
1430 #ifdef HAVE_READ_CACHE_PAGE_WANTS_FILE
1431 static inline int mdc_read_folio_remote(struct file *file, struct folio *folio)
1432 {
1433         return ll_mdc_read_page_remote(file->private_data,
1434                                        folio_page(folio, 0));
1435 }
1436 #else
1437 #define mdc_read_folio_remote   ll_mdc_read_page_remote
1438 #endif
1439
1440 /**
1441  * Read dir page from cache first, if it can not find it, read it from
1442  * server and add into the cache.
1443  *
1444  * \param[in] exp       MDC export
1445  * \param[in] op_data   client MD stack parameters, transfering parameters
1446  *                      between different layers on client MD stack.
1447  * \param[in] mrinfo    callback required for ldlm lock enqueue during
1448  *                      read page
1449  * \param[in] hash_offset the hash offset of the page to be read
1450  * \param[in] ppage     the page to be read
1451  *
1452  * retval               = 0 get the page successfully
1453  *                      errno(<0) get the page failed
1454  */
1455 static int mdc_read_page(struct obd_export *exp, struct md_op_data *op_data,
1456                          struct md_readdir_info *mrinfo, __u64 hash_offset,
1457                          struct page **ppage)
1458 {
1459         struct lookup_intent    it = { .it_op = IT_READDIR };
1460         struct page             *page;
1461         struct inode            *dir = op_data->op_data;
1462         struct address_space    *mapping;
1463         struct lu_dirpage       *dp;
1464         __u64                   start = 0;
1465         __u64                   end = 0;
1466         struct lustre_handle    lockh;
1467         struct ptlrpc_request   *enq_req = NULL;
1468         struct readpage_param   rp_param;
1469         int rc;
1470
1471         ENTRY;
1472
1473         *ppage = NULL;
1474
1475         LASSERT(dir != NULL);
1476         mapping = dir->i_mapping;
1477
1478         rc = mdc_intent_lock(exp, op_data, &it, &enq_req,
1479                              mrinfo->mr_blocking_ast, 0);
1480         if (enq_req != NULL)
1481                 ptlrpc_req_finished(enq_req);
1482
1483         if (rc < 0) {
1484                 CERROR("%s: "DFID" lock enqueue fails: rc = %d\n",
1485                        exp->exp_obd->obd_name, PFID(&op_data->op_fid1), rc);
1486                 RETURN(rc);
1487         }
1488
1489         rc = 0;
1490         lockh.cookie = it.it_lock_handle;
1491         mdc_set_lock_data(exp, &lockh, dir, NULL);
1492
1493         rp_param.rp_off = hash_offset;
1494         rp_param.rp_hash64 = op_data->op_cli_flags & CLI_HASH64;
1495         page = mdc_page_locate(mapping, &rp_param.rp_off, &start, &end,
1496                                rp_param.rp_hash64);
1497         if (IS_ERR(page)) {
1498                 CERROR("%s: dir page locate: "DFID" at %llu: rc %ld\n",
1499                        exp->exp_obd->obd_name, PFID(&op_data->op_fid1),
1500                        rp_param.rp_off, PTR_ERR(page));
1501                 GOTO(out_unlock, rc = PTR_ERR(page));
1502         } else if (page != NULL) {
1503                 /*
1504                  * XXX nikita: not entirely correct handling of a corner case:
1505                  * suppose hash chain of entries with hash value HASH crosses
1506                  * border between pages P0 and P1. First both P0 and P1 are
1507                  * cached, seekdir() is called for some entry from the P0 part
1508                  * of the chain. Later P0 goes out of cache. telldir(HASH)
1509                  * happens and finds P1, as it starts with matching hash
1510                  * value. Remaining entries from P0 part of the chain are
1511                  * skipped. (Is that really a bug?)
1512                  *
1513                  * Possible solutions: 0. don't cache P1 is such case, handle
1514                  * it as an "overflow" page. 1. invalidate all pages at
1515                  * once. 2. use HASH|1 as an index for P1.
1516                  */
1517                 GOTO(hash_collision, page);
1518         }
1519
1520         rp_param.rp_exp = exp;
1521         rp_param.rp_mod = op_data;
1522         page = ll_read_cache_page(mapping,
1523                                   hash_x_index(rp_param.rp_off,
1524                                                rp_param.rp_hash64),
1525                                   mdc_read_folio_remote, &rp_param);
1526         if (IS_ERR(page)) {
1527                 CDEBUG(D_INFO, "%s: read cache page: "DFID" at %llu: %ld\n",
1528                        exp->exp_obd->obd_name, PFID(&op_data->op_fid1),
1529                        rp_param.rp_off, PTR_ERR(page));
1530                 GOTO(out_unlock, rc = PTR_ERR(page));
1531         }
1532
1533         wait_on_page_locked(page);
1534         (void)kmap(page);
1535         if (!PageUptodate(page)) {
1536                 CERROR("%s: page not updated: "DFID" at %llu: rc %d\n",
1537                        exp->exp_obd->obd_name, PFID(&op_data->op_fid1),
1538                        rp_param.rp_off, -5);
1539                 goto fail;
1540         }
1541         if (!PageChecked(page))
1542                 SetPageChecked(page);
1543         if (PageError(page)) {
1544                 CERROR("%s: page error: "DFID" at %llu: rc %d\n",
1545                        exp->exp_obd->obd_name, PFID(&op_data->op_fid1),
1546                        rp_param.rp_off, -5);
1547                 goto fail;
1548         }
1549
1550 hash_collision:
1551         dp = page_address(page);
1552         if (BITS_PER_LONG == 32 && rp_param.rp_hash64) {
1553                 start = le64_to_cpu(dp->ldp_hash_start) >> 32;
1554                 end   = le64_to_cpu(dp->ldp_hash_end) >> 32;
1555                 rp_param.rp_off = hash_offset >> 32;
1556         } else {
1557                 start = le64_to_cpu(dp->ldp_hash_start);
1558                 end   = le64_to_cpu(dp->ldp_hash_end);
1559                 rp_param.rp_off = hash_offset;
1560         }
1561         if (end == start) {
1562                 LASSERT(start == rp_param.rp_off);
1563                 CWARN("Page-wide hash collision: %#lx\n", (unsigned long)end);
1564 #if BITS_PER_LONG == 32
1565                 CWARN("Real page-wide hash collision at [%llu %llu] with "
1566                       "hash %llu\n", le64_to_cpu(dp->ldp_hash_start),
1567                       le64_to_cpu(dp->ldp_hash_end), hash_offset);
1568 #endif
1569
1570                 /*
1571                  * Fetch whole overflow chain...
1572                  *
1573                  * XXX not yet.
1574                  */
1575                 goto fail;
1576         }
1577         *ppage = page;
1578 out_unlock:
1579         ldlm_lock_decref(&lockh, it.it_lock_mode);
1580         return rc;
1581 fail:
1582         kunmap(page);
1583         mdc_release_page(page, 1);
1584         rc = -EIO;
1585         goto out_unlock;
1586 }
1587
1588 static int mdc_statfs_interpret(const struct lu_env *env,
1589                                 struct ptlrpc_request *req, void *args, int rc)
1590 {
1591         struct obd_info *oinfo = args;
1592         struct obd_statfs *osfs;
1593
1594         if (!rc) {
1595                 osfs = req_capsule_server_get(&req->rq_pill, &RMF_OBD_STATFS);
1596                 if (!osfs)
1597                         return -EPROTO;
1598
1599                 oinfo->oi_osfs = osfs;
1600
1601                 CDEBUG(D_CACHE, "blocks=%llu free=%llu avail=%llu "
1602                        "objects=%llu free=%llu state=%x\n",
1603                         osfs->os_blocks, osfs->os_bfree, osfs->os_bavail,
1604                         osfs->os_files, osfs->os_ffree, osfs->os_state);
1605         }
1606
1607         oinfo->oi_cb_up(oinfo, rc);
1608
1609         return rc;
1610 }
1611
1612 static int mdc_statfs_async(struct obd_export *exp,
1613                             struct obd_info *oinfo, time64_t max_age,
1614                             struct ptlrpc_request_set *unused)
1615 {
1616         struct ptlrpc_request *req;
1617         struct obd_info *aa;
1618
1619         req = ptlrpc_request_alloc_pack(class_exp2cliimp(exp), &RQF_MDS_STATFS,
1620                                         LUSTRE_MDS_VERSION, MDS_STATFS);
1621         if (req == NULL)
1622                 return -ENOMEM;
1623
1624         ptlrpc_request_set_replen(req);
1625         req->rq_interpret_reply = mdc_statfs_interpret;
1626
1627         aa = ptlrpc_req_async_args(aa, req);
1628         *aa = *oinfo;
1629
1630         ptlrpcd_add_req(req);
1631
1632         return 0;
1633 }
1634
1635 static int mdc_statfs(const struct lu_env *env,
1636                       struct obd_export *exp, struct obd_statfs *osfs,
1637                       time64_t max_age, __u32 flags)
1638 {
1639         struct obd_device *obd = class_exp2obd(exp);
1640         struct req_format *fmt;
1641         struct ptlrpc_request *req;
1642         struct obd_statfs *msfs;
1643         struct obd_import *imp, *imp0;
1644         int rc;
1645         ENTRY;
1646
1647         /*
1648          * Since the request might also come from lprocfs, so we need
1649          * sync this with client_disconnect_export Bug15684
1650          */
1651         with_imp_locked(obd, imp0, rc)
1652                 imp = class_import_get(imp0);
1653         if (rc)
1654                 RETURN(rc);
1655
1656         fmt = &RQF_MDS_STATFS;
1657         if ((exp_connect_flags2(exp) & OBD_CONNECT2_SUM_STATFS) &&
1658             (flags & OBD_STATFS_SUM))
1659                 fmt = &RQF_MDS_STATFS_NEW;
1660         req = ptlrpc_request_alloc_pack(imp, fmt, LUSTRE_MDS_VERSION,
1661                                         MDS_STATFS);
1662         if (req == NULL)
1663                 GOTO(output, rc = -ENOMEM);
1664         req->rq_allow_intr = 1;
1665
1666         if ((flags & OBD_STATFS_SUM) &&
1667             (exp_connect_flags2(exp) & OBD_CONNECT2_SUM_STATFS)) {
1668                 /* request aggregated states */
1669                 struct mdt_body *body;
1670
1671                 body = req_capsule_client_get(&req->rq_pill, &RMF_MDT_BODY);
1672                 if (body == NULL)
1673                         GOTO(out, rc = -EPROTO);
1674                 body->mbo_valid = OBD_MD_FLAGSTATFS;
1675         }
1676
1677         ptlrpc_request_set_replen(req);
1678
1679         if (flags & OBD_STATFS_NODELAY) {
1680                 /* procfs requests not want stay in wait for avoid deadlock */
1681                 req->rq_no_resend = 1;
1682                 req->rq_no_delay = 1;
1683         }
1684
1685         rc = ptlrpc_queue_wait(req);
1686         if (rc) {
1687                 /* check connection error first */
1688                 if (imp->imp_connect_error)
1689                         rc = imp->imp_connect_error;
1690                 GOTO(out, rc);
1691         }
1692
1693         msfs = req_capsule_server_get(&req->rq_pill, &RMF_OBD_STATFS);
1694         if (msfs == NULL)
1695                 GOTO(out, rc = -EPROTO);
1696
1697         *osfs = *msfs;
1698         EXIT;
1699 out:
1700         ptlrpc_req_finished(req);
1701 output:
1702         class_import_put(imp);
1703         return rc;
1704 }
1705
1706 static int mdc_ioc_fid2path(struct obd_export *exp, struct getinfo_fid2path *gf)
1707 {
1708         __u32 keylen, vallen;
1709         void *key;
1710         int rc;
1711
1712         if (gf->gf_pathlen < 2)
1713                 RETURN(-EOVERFLOW);
1714
1715         /* Key is KEY_FID2PATH + getinfo_fid2path description */
1716         keylen = round_up(sizeof(KEY_FID2PATH) + sizeof(*gf) +
1717                                 sizeof(struct lu_fid), 8);
1718         OBD_ALLOC(key, keylen);
1719         if (key == NULL)
1720                 RETURN(-ENOMEM);
1721         memcpy(key, KEY_FID2PATH, sizeof(KEY_FID2PATH));
1722         memcpy(key + round_up(sizeof(KEY_FID2PATH), 8), gf, sizeof(*gf));
1723         memcpy(key + round_up(sizeof(KEY_FID2PATH), 8) + sizeof(*gf),
1724                gf->gf_u.gf_root_fid, sizeof(struct lu_fid));
1725         CDEBUG(D_IOCTL, "path get "DFID" from %llu #%d\n",
1726                PFID(&gf->gf_fid), gf->gf_recno, gf->gf_linkno);
1727
1728         if (!fid_is_sane(&gf->gf_fid))
1729                 GOTO(out, rc = -EINVAL);
1730
1731         /* Val is struct getinfo_fid2path result plus path */
1732         vallen = sizeof(*gf) + gf->gf_pathlen;
1733
1734         rc = obd_get_info(NULL, exp, keylen, key, &vallen, gf);
1735         if (rc != 0 && rc != -EREMOTE)
1736                 GOTO(out, rc);
1737
1738         if (vallen <= sizeof(*gf))
1739                 GOTO(out, rc = -EPROTO);
1740         if (vallen > sizeof(*gf) + gf->gf_pathlen)
1741                 GOTO(out, rc = -EOVERFLOW);
1742
1743         CDEBUG(D_IOCTL, "path got "DFID" from %llu #%d: %.*s\n",
1744                PFID(&gf->gf_fid), gf->gf_recno, gf->gf_linkno,
1745                /* only log the first 512 characters of the path */
1746                512, gf->gf_u.gf_path);
1747
1748 out:
1749         OBD_FREE(key, keylen);
1750         return rc;
1751 }
1752
1753 static int mdc_ioc_hsm_progress(struct obd_export *exp,
1754                                 struct hsm_progress_kernel *hpk)
1755 {
1756         struct obd_import               *imp = class_exp2cliimp(exp);
1757         struct hsm_progress_kernel      *req_hpk;
1758         struct ptlrpc_request           *req;
1759         int                              rc;
1760         ENTRY;
1761
1762         req = ptlrpc_request_alloc_pack(imp, &RQF_MDS_HSM_PROGRESS,
1763                                         LUSTRE_MDS_VERSION, MDS_HSM_PROGRESS);
1764         if (req == NULL)
1765                 GOTO(out, rc = -ENOMEM);
1766
1767         mdc_pack_body(&req->rq_pill, NULL, 0, 0, -1, 0);
1768
1769         /* Copy hsm_progress struct */
1770         req_hpk = req_capsule_client_get(&req->rq_pill, &RMF_MDS_HSM_PROGRESS);
1771         if (req_hpk == NULL)
1772                 GOTO(out, rc = -EPROTO);
1773
1774         *req_hpk = *hpk;
1775         req_hpk->hpk_errval = lustre_errno_hton(hpk->hpk_errval);
1776
1777         ptlrpc_request_set_replen(req);
1778
1779         ptlrpc_get_mod_rpc_slot(req);
1780         rc = ptlrpc_queue_wait(req);
1781         ptlrpc_put_mod_rpc_slot(req);
1782
1783         GOTO(out, rc);
1784 out:
1785         ptlrpc_req_finished(req);
1786         return rc;
1787 }
1788 /**
1789  * Send hsm_ct_register to MDS
1790  *
1791  * \param[in]   imp             import
1792  * \param[in]   archive_count   if in bitmap format, it is the bitmap,
1793  *                              else it is the count of archive_ids
1794  * \param[in]   archives        if in bitmap format, it is NULL,
1795  *                              else it is archive_id lists
1796  */
1797 static int mdc_ioc_hsm_ct_register(struct obd_import *imp, __u32 archive_count,
1798                                    __u32 *archives)
1799 {
1800         struct ptlrpc_request *req;
1801         __u32 *archive_array;
1802         size_t archives_size;
1803         int rc;
1804         ENTRY;
1805
1806         req = ptlrpc_request_alloc(imp, &RQF_MDS_HSM_CT_REGISTER);
1807         if (req == NULL)
1808                 RETURN(-ENOMEM);
1809
1810         if (archives != NULL)
1811                 archives_size = sizeof(*archive_array) * archive_count;
1812         else
1813                 archives_size = sizeof(archive_count);
1814
1815         req_capsule_set_size(&req->rq_pill, &RMF_MDS_HSM_ARCHIVE,
1816                              RCL_CLIENT, archives_size);
1817
1818         rc = ptlrpc_request_pack(req, LUSTRE_MDS_VERSION, MDS_HSM_CT_REGISTER);
1819         if (rc) {
1820                 ptlrpc_request_free(req);
1821                 RETURN(-ENOMEM);
1822         }
1823
1824         mdc_pack_body(&req->rq_pill, NULL, 0, 0, -1, 0);
1825
1826         archive_array = req_capsule_client_get(&req->rq_pill,
1827                                                &RMF_MDS_HSM_ARCHIVE);
1828         if (archive_array == NULL)
1829                 GOTO(out, rc = -EPROTO);
1830
1831         if (archives != NULL)
1832                 memcpy(archive_array, archives, archives_size);
1833         else
1834                 *archive_array = archive_count;
1835
1836         ptlrpc_request_set_replen(req);
1837         req->rq_no_resend = 1;
1838
1839         rc = mdc_queue_wait(req);
1840         GOTO(out, rc);
1841 out:
1842         ptlrpc_req_finished(req);
1843         return rc;
1844 }
1845
1846 static int mdc_ioc_hsm_current_action(struct obd_export *exp,
1847                                       struct md_op_data *op_data)
1848 {
1849         struct hsm_current_action       *hca = op_data->op_data;
1850         struct hsm_current_action       *req_hca;
1851         struct ptlrpc_request           *req;
1852         int                              rc;
1853         ENTRY;
1854
1855         req = ptlrpc_request_alloc(class_exp2cliimp(exp),
1856                                    &RQF_MDS_HSM_ACTION);
1857         if (req == NULL)
1858                 RETURN(-ENOMEM);
1859
1860         rc = ptlrpc_request_pack(req, LUSTRE_MDS_VERSION, MDS_HSM_ACTION);
1861         if (rc) {
1862                 ptlrpc_request_free(req);
1863                 RETURN(rc);
1864         }
1865
1866         mdc_pack_body(&req->rq_pill, &op_data->op_fid1, 0, 0,
1867                       op_data->op_suppgids[0], 0);
1868
1869         ptlrpc_request_set_replen(req);
1870
1871         rc = mdc_queue_wait(req);
1872         if (rc)
1873                 GOTO(out, rc);
1874
1875         req_hca = req_capsule_server_get(&req->rq_pill,
1876                                          &RMF_MDS_HSM_CURRENT_ACTION);
1877         if (req_hca == NULL)
1878                 GOTO(out, rc = -EPROTO);
1879
1880         *hca = *req_hca;
1881
1882         EXIT;
1883 out:
1884         ptlrpc_req_finished(req);
1885         return rc;
1886 }
1887
1888 static int mdc_ioc_hsm_ct_unregister(struct obd_import *imp)
1889 {
1890         struct ptlrpc_request   *req;
1891         int                      rc;
1892         ENTRY;
1893
1894         req = ptlrpc_request_alloc_pack(imp, &RQF_MDS_HSM_CT_UNREGISTER,
1895                                         LUSTRE_MDS_VERSION,
1896                                         MDS_HSM_CT_UNREGISTER);
1897         if (req == NULL)
1898                 GOTO(out, rc = -ENOMEM);
1899
1900         mdc_pack_body(&req->rq_pill, NULL, 0, 0, -1, 0);
1901
1902         ptlrpc_request_set_replen(req);
1903
1904         rc = mdc_queue_wait(req);
1905         GOTO(out, rc);
1906 out:
1907         ptlrpc_req_finished(req);
1908         return rc;
1909 }
1910
1911 static int mdc_ioc_hsm_state_get(struct obd_export *exp,
1912                                  struct md_op_data *op_data)
1913 {
1914         struct hsm_user_state   *hus = op_data->op_data;
1915         struct hsm_user_state   *req_hus;
1916         struct ptlrpc_request   *req;
1917         int                      rc;
1918         ENTRY;
1919
1920         req = ptlrpc_request_alloc(class_exp2cliimp(exp),
1921                                    &RQF_MDS_HSM_STATE_GET);
1922         if (req == NULL)
1923                 RETURN(-ENOMEM);
1924
1925         rc = ptlrpc_request_pack(req, LUSTRE_MDS_VERSION, MDS_HSM_STATE_GET);
1926         if (rc != 0) {
1927                 ptlrpc_request_free(req);
1928                 RETURN(rc);
1929         }
1930
1931         mdc_pack_body(&req->rq_pill, &op_data->op_fid1, 0, 0,
1932                       op_data->op_suppgids[0], 0);
1933
1934         ptlrpc_request_set_replen(req);
1935
1936         rc = mdc_queue_wait(req);
1937         if (rc)
1938                 GOTO(out, rc);
1939
1940         req_hus = req_capsule_server_get(&req->rq_pill, &RMF_HSM_USER_STATE);
1941         if (req_hus == NULL)
1942                 GOTO(out, rc = -EPROTO);
1943
1944         *hus = *req_hus;
1945
1946         EXIT;
1947 out:
1948         ptlrpc_req_finished(req);
1949         return rc;
1950 }
1951
1952 static int mdc_ioc_hsm_state_set(struct obd_export *exp,
1953                                  struct md_op_data *op_data)
1954 {
1955         struct hsm_state_set    *hss = op_data->op_data;
1956         struct hsm_state_set    *req_hss;
1957         struct ptlrpc_request   *req;
1958         int                      rc;
1959         ENTRY;
1960
1961         req = ptlrpc_request_alloc(class_exp2cliimp(exp),
1962                                    &RQF_MDS_HSM_STATE_SET);
1963         if (req == NULL)
1964                 RETURN(-ENOMEM);
1965
1966         rc = ptlrpc_request_pack(req, LUSTRE_MDS_VERSION, MDS_HSM_STATE_SET);
1967         if (rc) {
1968                 ptlrpc_request_free(req);
1969                 RETURN(rc);
1970         }
1971
1972         mdc_pack_body(&req->rq_pill, &op_data->op_fid1, 0, 0,
1973                       op_data->op_suppgids[0], 0);
1974
1975         /* Copy states */
1976         req_hss = req_capsule_client_get(&req->rq_pill, &RMF_HSM_STATE_SET);
1977         if (req_hss == NULL)
1978                 GOTO(out, rc = -EPROTO);
1979         *req_hss = *hss;
1980
1981         ptlrpc_request_set_replen(req);
1982
1983         ptlrpc_get_mod_rpc_slot(req);
1984         rc = ptlrpc_queue_wait(req);
1985         ptlrpc_put_mod_rpc_slot(req);
1986
1987         GOTO(out, rc);
1988 out:
1989         ptlrpc_req_finished(req);
1990         return rc;
1991 }
1992
1993 /* For RESTORE and RELEASE the mdt will take EX lock on the file layout.
1994  * So we can use early cancel on client side locks for that resource.
1995  */
1996 static inline int mdc_hsm_request_lock_to_cancel(struct obd_export *exp,
1997                                                  struct hsm_user_request *hur,
1998                                                  struct list_head *cancels)
1999 {
2000         struct hsm_user_item *hui = &hur->hur_user_item[0];
2001         struct hsm_request *req_hr = &hur->hur_request;
2002         int count = 0;
2003         int i;
2004
2005         if (req_hr->hr_action != HUA_RESTORE &&
2006             req_hr->hr_action != HUA_RELEASE)
2007                 return 0;
2008
2009         for (i = 0; i < req_hr->hr_itemcount; i++, hui++) {
2010                 if (!fid_is_sane(&hui->hui_fid))
2011                         continue;
2012                 count += mdc_resource_get_unused(exp, &hui->hui_fid, cancels,
2013                                                  LCK_EX, MDS_INODELOCK_LAYOUT);
2014         }
2015
2016         return count;
2017 }
2018
2019 static int mdc_ioc_hsm_request(struct obd_export *exp,
2020                                struct hsm_user_request *hur)
2021 {
2022         struct obd_import *imp = class_exp2cliimp(exp);
2023         struct ptlrpc_request *req;
2024         struct hsm_request *req_hr;
2025         struct hsm_user_item *req_hui;
2026         char *req_opaque;
2027         LIST_HEAD(cancels);
2028         int count;
2029         int rc;
2030         ENTRY;
2031
2032         req = ptlrpc_request_alloc(imp, &RQF_MDS_HSM_REQUEST);
2033         if (req == NULL)
2034                 RETURN(-ENOMEM);
2035
2036         req_capsule_set_size(&req->rq_pill, &RMF_MDS_HSM_USER_ITEM, RCL_CLIENT,
2037                              hur->hur_request.hr_itemcount
2038                              * sizeof(struct hsm_user_item));
2039         req_capsule_set_size(&req->rq_pill, &RMF_GENERIC_DATA, RCL_CLIENT,
2040                              hur->hur_request.hr_data_len);
2041
2042         rc = ptlrpc_request_pack(req, LUSTRE_MDS_VERSION, MDS_HSM_REQUEST);
2043         if (rc) {
2044                 ptlrpc_request_free(req);
2045                 RETURN(rc);
2046         }
2047
2048         /* Cancel existing locks */
2049         count = mdc_hsm_request_lock_to_cancel(exp, hur, &cancels);
2050         ldlm_cli_cancel_list(&cancels, count, NULL, 0);
2051         mdc_pack_body(&req->rq_pill, NULL, 0, 0, -1, 0);
2052
2053         /* Copy hsm_request struct */
2054         req_hr = req_capsule_client_get(&req->rq_pill, &RMF_MDS_HSM_REQUEST);
2055         if (req_hr == NULL)
2056                 GOTO(out, rc = -EPROTO);
2057         *req_hr = hur->hur_request;
2058
2059         /* Copy hsm_user_item structs */
2060         req_hui = req_capsule_client_get(&req->rq_pill, &RMF_MDS_HSM_USER_ITEM);
2061         if (req_hui == NULL)
2062                 GOTO(out, rc = -EPROTO);
2063         memcpy(req_hui, hur->hur_user_item,
2064                hur->hur_request.hr_itemcount * sizeof(struct hsm_user_item));
2065
2066         /* Copy opaque field */
2067         req_opaque = req_capsule_client_get(&req->rq_pill, &RMF_GENERIC_DATA);
2068         if (req_opaque == NULL)
2069                 GOTO(out, rc = -EPROTO);
2070         memcpy(req_opaque, hur_data(hur), hur->hur_request.hr_data_len);
2071
2072         ptlrpc_request_set_replen(req);
2073
2074         ptlrpc_get_mod_rpc_slot(req);
2075         rc = ptlrpc_queue_wait(req);
2076         ptlrpc_put_mod_rpc_slot(req);
2077
2078         GOTO(out, rc);
2079
2080 out:
2081         ptlrpc_req_finished(req);
2082         return rc;
2083 }
2084
2085 static int mdc_ioc_hsm_ct_start(struct obd_export *exp,
2086                                 struct lustre_kernelcomm *lk);
2087
2088 static int mdc_quotactl(struct obd_device *unused, struct obd_export *exp,
2089                         struct obd_quotactl *oqctl)
2090 {
2091         struct ptlrpc_request *req;
2092         struct obd_quotactl *oqc;
2093         int rc;
2094         ENTRY;
2095
2096         req = ptlrpc_request_alloc(class_exp2cliimp(exp), &RQF_MDS_QUOTACTL);
2097         if (req == NULL)
2098                 RETURN(-ENOMEM);
2099
2100
2101         if (LUSTRE_Q_CMD_IS_POOL(oqctl->qc_cmd))
2102                 req_capsule_set_size(&req->rq_pill,
2103                                      &RMF_OBD_QUOTACTL,
2104                                      RCL_CLIENT,
2105                                      sizeof(*oqc) + LOV_MAXPOOLNAME + 1);
2106
2107         rc = ptlrpc_request_pack(req, LUSTRE_MDS_VERSION,
2108                                  MDS_QUOTACTL);
2109         if (rc) {
2110                 ptlrpc_request_free(req);
2111                 RETURN(rc);
2112         }
2113
2114         oqc = req_capsule_client_get(&req->rq_pill, &RMF_OBD_QUOTACTL);
2115         QCTL_COPY(oqc, oqctl);
2116
2117         ptlrpc_request_set_replen(req);
2118         ptlrpc_at_set_req_timeout(req);
2119
2120         rc = ptlrpc_queue_wait(req);
2121         if (rc) {
2122                 CERROR("%s: ptlrpc_queue_wait failed: rc = %d\n",
2123                        exp->exp_obd->obd_name, rc);
2124                 GOTO(out, rc);
2125         }
2126
2127         if (req->rq_repmsg &&
2128             (oqc = req_capsule_server_get(&req->rq_pill, &RMF_OBD_QUOTACTL))) {
2129                 QCTL_COPY(oqctl, oqc);
2130         } else if (!rc) {
2131                 rc = -EPROTO;
2132                 CERROR("%s: cannot unpack obd_quotactl: rc = %d\n",
2133                         exp->exp_obd->obd_name, rc);
2134         }
2135 out:
2136         ptlrpc_req_finished(req);
2137
2138         RETURN(rc);
2139 }
2140
2141 static int mdc_ioc_swap_layouts(struct obd_export *exp,
2142                                 struct md_op_data *op_data)
2143 {
2144         LIST_HEAD(cancels);
2145         struct ptlrpc_request   *req;
2146         int                      rc, count;
2147         struct mdc_swap_layouts *msl, *payload;
2148         ENTRY;
2149
2150         msl = op_data->op_data;
2151
2152         /* When the MDT will get the MDS_SWAP_LAYOUTS RPC the
2153          * first thing it will do is to cancel the 2 layout
2154          * locks held by this client.
2155          * So the client must cancel its layout locks on the 2 fids
2156          * with the request RPC to avoid extra RPC round trips.
2157          */
2158         count = mdc_resource_get_unused(exp, &op_data->op_fid1, &cancels,
2159                                         LCK_EX, MDS_INODELOCK_LAYOUT |
2160                                         MDS_INODELOCK_XATTR);
2161         count += mdc_resource_get_unused(exp, &op_data->op_fid2, &cancels,
2162                                          LCK_EX, MDS_INODELOCK_LAYOUT |
2163                                          MDS_INODELOCK_XATTR);
2164
2165         req = ptlrpc_request_alloc(class_exp2cliimp(exp),
2166                                    &RQF_MDS_SWAP_LAYOUTS);
2167         if (req == NULL) {
2168                 ldlm_lock_list_put(&cancels, l_bl_ast, count);
2169                 RETURN(-ENOMEM);
2170         }
2171
2172         rc = mdc_prep_elc_req(exp, req, MDS_SWAP_LAYOUTS, &cancels, count);
2173         if (rc) {
2174                 ptlrpc_request_free(req);
2175                 RETURN(rc);
2176         }
2177
2178         mdc_swap_layouts_pack(&req->rq_pill, op_data);
2179
2180         payload = req_capsule_client_get(&req->rq_pill, &RMF_SWAP_LAYOUTS);
2181         LASSERT(payload);
2182
2183         *payload = *msl;
2184
2185         ptlrpc_request_set_replen(req);
2186
2187         rc = ptlrpc_queue_wait(req);
2188         if (rc)
2189                 GOTO(out, rc);
2190         EXIT;
2191
2192 out:
2193         ptlrpc_req_finished(req);
2194         return rc;
2195 }
2196
2197 static int mdc_iocontrol(unsigned int cmd, struct obd_export *exp, int len,
2198                          void *karg, void __user *uarg)
2199 {
2200         struct obd_device *obd = exp->exp_obd;
2201         struct obd_ioctl_data *data;
2202         struct obd_import *imp = obd->u.cli.cl_import;
2203         int rc;
2204
2205         ENTRY;
2206         CDEBUG(D_IOCTL, "%s: cmd=%x len=%u karg=%pK uarg=%pK\n",
2207                obd->obd_name, cmd, len, karg, uarg);
2208
2209         /* handle commands that do not need @karg first */
2210         switch (cmd) {
2211         case LL_IOC_GET_CONNECT_FLAGS:
2212                 if (copy_to_user(uarg, exp_connect_flags_ptr(exp),
2213                                  sizeof(*exp_connect_flags_ptr(exp))))
2214                         RETURN(-EFAULT);
2215                 RETURN(0);
2216         }
2217
2218         if (unlikely(karg == NULL))
2219                 RETURN(OBD_IOC_ERROR(obd->obd_name, cmd, "karg=NULL", -EINVAL));
2220         data = karg;
2221
2222         if (!try_module_get(THIS_MODULE)) {
2223                 CERROR("%s: cannot get module '%s'\n", obd->obd_name,
2224                        module_name(THIS_MODULE));
2225                 return -EINVAL;
2226         }
2227         switch (cmd) {
2228         case OBD_IOC_FID2PATH:
2229                 rc = mdc_ioc_fid2path(exp, karg);
2230                 GOTO(out, rc);
2231         case LL_IOC_HSM_CT_START:
2232                 rc = mdc_ioc_hsm_ct_start(exp, karg);
2233                 /* ignore if it was already registered on this MDS. */
2234                 if (rc == -EEXIST)
2235                         rc = 0;
2236                 GOTO(out, rc);
2237         case LL_IOC_HSM_PROGRESS:
2238                 rc = mdc_ioc_hsm_progress(exp, karg);
2239                 GOTO(out, rc);
2240         case LL_IOC_HSM_STATE_GET:
2241                 rc = mdc_ioc_hsm_state_get(exp, karg);
2242                 GOTO(out, rc);
2243         case LL_IOC_HSM_STATE_SET:
2244                 rc = mdc_ioc_hsm_state_set(exp, karg);
2245                 GOTO(out, rc);
2246         case LL_IOC_HSM_ACTION:
2247                 rc = mdc_ioc_hsm_current_action(exp, karg);
2248                 GOTO(out, rc);
2249         case LL_IOC_HSM_REQUEST:
2250                 rc = mdc_ioc_hsm_request(exp, karg);
2251                 GOTO(out, rc);
2252         case OBD_IOC_CLIENT_RECOVER:
2253                 rc = ptlrpc_recover_import(imp, data->ioc_inlbuf1, 0);
2254                 if (rc < 0)
2255                         GOTO(out, rc);
2256                 GOTO(out, rc = 0);
2257 #ifdef IOC_OSC_SET_ACTIVE
2258         case_OBD_IOC_DEPRECATED_FT(IOC_OSC_SET_ACTIVE, obd->obd_name, 2, 17);
2259 #endif
2260         case OBD_IOC_SET_ACTIVE:
2261                 rc = ptlrpc_set_import_active(imp, data->ioc_offset);
2262                 GOTO(out, rc);
2263         /*
2264          * Normally IOC_OBD_STATFS, OBD_IOC_QUOTACTL iocontrol are handled by
2265          * LMV instead of MDC. But when the cluster is upgraded from 1.8,
2266          * there'd be no LMV layer thus we might be called here. Eventually
2267          * this code should be removed.
2268          * bz20731, LU-592.
2269          */
2270         case IOC_OBD_STATFS: {
2271                 struct obd_statfs stat_buf = {0};
2272
2273                 if (*((__u32 *) data->ioc_inlbuf2) != 0)
2274                         GOTO(out, rc = -ENODEV);
2275
2276                 /* copy UUID */
2277                 if (copy_to_user(data->ioc_pbuf2, obd2cli_tgt(obd),
2278                                  min((int)data->ioc_plen2,
2279                                      (int)sizeof(struct obd_uuid))))
2280                         GOTO(out, rc = -EFAULT);
2281
2282                 rc = mdc_statfs(NULL, obd->obd_self_export, &stat_buf,
2283                                 ktime_get_seconds() - OBD_STATFS_CACHE_SECONDS,
2284                                 0);
2285                 if (rc != 0)
2286                         GOTO(out, rc);
2287
2288                 if (copy_to_user(data->ioc_pbuf1, &stat_buf,
2289                                      min((int) data->ioc_plen1,
2290                                          (int) sizeof(stat_buf))))
2291                         GOTO(out, rc = -EFAULT);
2292
2293                 GOTO(out, rc = 0);
2294         }
2295         case OBD_IOC_QUOTACTL: {
2296                 struct if_quotactl *qctl = karg;
2297                 struct obd_quotactl *oqctl;
2298
2299                 OBD_ALLOC_PTR(oqctl);
2300                 if (oqctl == NULL)
2301                         GOTO(out, rc = -ENOMEM);
2302
2303                 QCTL_COPY(oqctl, qctl);
2304                 rc = obd_quotactl(exp, oqctl);
2305                 if (rc == 0) {
2306                         QCTL_COPY(qctl, oqctl);
2307                         qctl->qc_valid = QC_MDTIDX;
2308                         qctl->obd_uuid = obd->u.cli.cl_target_uuid;
2309                 }
2310
2311                 OBD_FREE_PTR(oqctl);
2312                 GOTO(out, rc);
2313         }
2314         case LL_IOC_LOV_SWAP_LAYOUTS:
2315                 rc = mdc_ioc_swap_layouts(exp, karg);
2316                 GOTO(out, rc);
2317         default:
2318                 rc = OBD_IOC_ERROR(obd->obd_name, cmd, "unrecognized", -ENOTTY);
2319                 break;
2320         }
2321 out:
2322         module_put(THIS_MODULE);
2323
2324         return rc;
2325 }
2326
2327 static int mdc_get_info_rpc(struct obd_export *exp,
2328                             u32 keylen, void *key,
2329                             u32 vallen, void *val)
2330 {
2331         struct obd_import      *imp = class_exp2cliimp(exp);
2332         struct ptlrpc_request  *req;
2333         char                   *tmp;
2334         int                     rc = -EINVAL;
2335         ENTRY;
2336
2337         req = ptlrpc_request_alloc(imp, &RQF_MDS_GET_INFO);
2338         if (req == NULL)
2339                 RETURN(-ENOMEM);
2340
2341         req_capsule_set_size(&req->rq_pill, &RMF_GETINFO_KEY,
2342                              RCL_CLIENT, keylen);
2343         req_capsule_set_size(&req->rq_pill, &RMF_GETINFO_VALLEN,
2344                              RCL_CLIENT, sizeof(vallen));
2345
2346         rc = ptlrpc_request_pack(req, LUSTRE_MDS_VERSION, MDS_GET_INFO);
2347         if (rc) {
2348                 ptlrpc_request_free(req);
2349                 RETURN(rc);
2350         }
2351
2352         tmp = req_capsule_client_get(&req->rq_pill, &RMF_GETINFO_KEY);
2353         memcpy(tmp, key, keylen);
2354         tmp = req_capsule_client_get(&req->rq_pill, &RMF_GETINFO_VALLEN);
2355         memcpy(tmp, &vallen, sizeof(vallen));
2356
2357         req_capsule_set_size(&req->rq_pill, &RMF_GETINFO_VAL,
2358                              RCL_SERVER, vallen);
2359         ptlrpc_request_set_replen(req);
2360
2361         /* if server failed to resolve FID, and OI scrub not able to fix it, it
2362          * will return -EINPROGRESS, ptlrpc_queue_wait() will keep retrying,
2363          * set request interruptible to avoid deadlock.
2364          */
2365         if (KEY_IS(KEY_FID2PATH))
2366                 req->rq_allow_intr = 1;
2367
2368         rc = ptlrpc_queue_wait(req);
2369         /* -EREMOTE means the get_info result is partial, and it needs to
2370          * continue on another MDT, see fid2path part in lmv_iocontrol */
2371         if (rc == 0 || rc == -EREMOTE) {
2372                 tmp = req_capsule_server_get(&req->rq_pill, &RMF_GETINFO_VAL);
2373                 memcpy(val, tmp, vallen);
2374                 if (req_capsule_rep_need_swab(&req->rq_pill)) {
2375                         if (KEY_IS(KEY_FID2PATH))
2376                                 lustre_swab_fid2path(val);
2377                 }
2378         }
2379         ptlrpc_req_finished(req);
2380
2381         RETURN(rc);
2382 }
2383
2384 static void lustre_swab_hai(struct hsm_action_item *h)
2385 {
2386         __swab32s(&h->hai_len);
2387         __swab32s(&h->hai_action);
2388         lustre_swab_lu_fid(&h->hai_fid);
2389         lustre_swab_lu_fid(&h->hai_dfid);
2390         __swab64s(&h->hai_cookie);
2391         __swab64s(&h->hai_extent.offset);
2392         __swab64s(&h->hai_extent.length);
2393         __swab64s(&h->hai_gid);
2394 }
2395
2396 static void lustre_swab_hal(struct hsm_action_list *h)
2397 {
2398         struct hsm_action_item  *hai;
2399         __u32                    i;
2400
2401         __swab32s(&h->hal_version);
2402         __swab32s(&h->hal_count);
2403         __swab32s(&h->hal_archive_id);
2404         __swab64s(&h->hal_flags);
2405         hai = hai_first(h);
2406         for (i = 0; i < h->hal_count; i++, hai = hai_next(hai))
2407                 lustre_swab_hai(hai);
2408 }
2409
2410 static void lustre_swab_kuch(struct kuc_hdr *l)
2411 {
2412         __swab16s(&l->kuc_magic);
2413         /* __u8 l->kuc_transport */
2414         __swab16s(&l->kuc_msgtype);
2415         __swab16s(&l->kuc_msglen);
2416 }
2417
2418 static int mdc_ioc_hsm_ct_start(struct obd_export *exp,
2419                                 struct lustre_kernelcomm *lk)
2420 {
2421         struct obd_import *imp = class_exp2cliimp(exp);
2422         int rc = 0;
2423
2424         if (lk->lk_group != KUC_GRP_HSM) {
2425                 CERROR("Bad copytool group %d\n", lk->lk_group);
2426                 return -EINVAL;
2427         }
2428
2429         CDEBUG(D_HSM, "CT start r%d w%d u%d g%d f%#x\n", lk->lk_rfd, lk->lk_wfd,
2430                lk->lk_uid, lk->lk_group, lk->lk_flags);
2431
2432         if (lk->lk_flags & LK_FLG_STOP) {
2433                 /* Unregister with the coordinator */
2434                 rc = mdc_ioc_hsm_ct_unregister(imp);
2435         } else {
2436                 __u32 *archives = NULL;
2437
2438                 if ((lk->lk_flags & LK_FLG_DATANR) && lk->lk_data_count > 0)
2439                         archives = lk->lk_data;
2440
2441                 rc = mdc_ioc_hsm_ct_register(imp, lk->lk_data_count, archives);
2442         }
2443
2444         return rc;
2445 }
2446
2447 /**
2448  * Send a message to any listening copytools
2449  * @param val KUC message (kuc_hdr + hsm_action_list)
2450  * @param len total length of message
2451  */
2452 static int mdc_hsm_copytool_send(const struct obd_uuid *uuid,
2453                                  size_t len, void *val)
2454 {
2455         struct kuc_hdr          *lh = (struct kuc_hdr *)val;
2456         struct hsm_action_list  *hal = (struct hsm_action_list *)(lh + 1);
2457         int                      rc;
2458         ENTRY;
2459
2460         if (len < sizeof(*lh) + sizeof(*hal)) {
2461                 CERROR("Short HSM message %zu < %zu\n", len,
2462                        sizeof(*lh) + sizeof(*hal));
2463                 RETURN(-EPROTO);
2464         }
2465         if (lh->kuc_magic == __swab16(KUC_MAGIC)) {
2466                 lustre_swab_kuch(lh);
2467                 lustre_swab_hal(hal);
2468         } else if (lh->kuc_magic != KUC_MAGIC) {
2469                 CERROR("Bad magic %x!=%x\n", lh->kuc_magic, KUC_MAGIC);
2470                 RETURN(-EPROTO);
2471         }
2472
2473         CDEBUG(D_HSM, " Received message mg=%x t=%d m=%d l=%d actions=%d "
2474                "on %s\n",
2475                lh->kuc_magic, lh->kuc_transport, lh->kuc_msgtype,
2476                lh->kuc_msglen, hal->hal_count, hal->hal_fsname);
2477
2478         /* Broadcast to HSM listeners */
2479         rc = libcfs_kkuc_group_put(uuid, KUC_GRP_HSM, lh);
2480
2481         RETURN(rc);
2482 }
2483
2484 /**
2485  * callback function passed to kuc for re-registering each HSM copytool
2486  * running on MDC, after MDT shutdown/recovery.
2487  * @param data copytool registration data
2488  * @param cb_arg callback argument (obd_import)
2489  */
2490 static int mdc_hsm_ct_reregister(void *data, void *cb_arg)
2491 {
2492         struct obd_import *imp = (struct obd_import *)cb_arg;
2493         struct kkuc_ct_data *kcd = data;
2494         __u32 *archives = NULL;
2495         int rc;
2496
2497         if (kcd == NULL ||
2498             (kcd->kcd_magic != KKUC_CT_DATA_ARRAY_MAGIC &&
2499              kcd->kcd_magic != KKUC_CT_DATA_BITMAP_MAGIC))
2500                 return -EPROTO;
2501
2502         if (kcd->kcd_magic == KKUC_CT_DATA_BITMAP_MAGIC) {
2503                 CDEBUG(D_HA, "%s: recover copytool registration to MDT "
2504                        "(archive=%#x)\n", imp->imp_obd->obd_name,
2505                        kcd->kcd_nr_archives);
2506         } else {
2507                 CDEBUG(D_HA, "%s: recover copytool registration to MDT "
2508                        "(archive nr = %u)\n",
2509                        imp->imp_obd->obd_name, kcd->kcd_nr_archives);
2510                 if (kcd->kcd_nr_archives != 0)
2511                         archives = kcd->kcd_archives;
2512         }
2513
2514         rc = mdc_ioc_hsm_ct_register(imp, kcd->kcd_nr_archives, archives);
2515         /* ignore error if the copytool is already registered */
2516         return (rc == -EEXIST) ? 0 : rc;
2517 }
2518
2519 /**
2520  * Re-establish all kuc contexts with MDT
2521  * after MDT shutdown/recovery.
2522  */
2523 static int mdc_kuc_reregister(struct obd_import *imp)
2524 {
2525         /* re-register HSM agents */
2526         return libcfs_kkuc_group_foreach(&imp->imp_obd->obd_uuid, KUC_GRP_HSM,
2527                                          mdc_hsm_ct_reregister, imp);
2528 }
2529
2530 static int mdc_set_info_async(const struct lu_env *env,
2531                               struct obd_export *exp,
2532                               u32 keylen, void *key,
2533                               u32 vallen, void *val,
2534                               struct ptlrpc_request_set *set)
2535 {
2536         struct obd_import       *imp = class_exp2cliimp(exp);
2537         int                      rc;
2538         ENTRY;
2539
2540         if (KEY_IS(KEY_READ_ONLY)) {
2541                 if (vallen != sizeof(int))
2542                         RETURN(-EINVAL);
2543
2544                 spin_lock(&imp->imp_lock);
2545                 if (*((int *)val)) {
2546                         imp->imp_connect_flags_orig |= OBD_CONNECT_RDONLY;
2547                         imp->imp_connect_data.ocd_connect_flags |=
2548                                                         OBD_CONNECT_RDONLY;
2549                 } else {
2550                         imp->imp_connect_flags_orig &= ~OBD_CONNECT_RDONLY;
2551                         imp->imp_connect_data.ocd_connect_flags &=
2552                                                         ~OBD_CONNECT_RDONLY;
2553                 }
2554                 spin_unlock(&imp->imp_lock);
2555
2556                 rc = do_set_info_async(imp, MDS_SET_INFO, LUSTRE_MDS_VERSION,
2557                                        keylen, key, vallen, val, set);
2558                 RETURN(rc);
2559         }
2560         if (KEY_IS(KEY_CHANGELOG_CLEAR)) {
2561                 rc = do_set_info_async(imp, MDS_SET_INFO, LUSTRE_MDS_VERSION,
2562                                        keylen, key, vallen, val, set);
2563                 RETURN(rc);
2564         }
2565         if (KEY_IS(KEY_HSM_COPYTOOL_SEND)) {
2566                 rc = mdc_hsm_copytool_send(&imp->imp_obd->obd_uuid, vallen,
2567                                            val);
2568                 RETURN(rc);
2569         }
2570
2571         if (KEY_IS(KEY_DEFAULT_EASIZE)) {
2572                 __u32 *default_easize = val;
2573
2574                 exp->exp_obd->u.cli.cl_default_mds_easize = *default_easize;
2575                 RETURN(0);
2576         }
2577
2578         rc = osc_set_info_async(env, exp, keylen, key, vallen, val, set);
2579         RETURN(rc);
2580 }
2581
2582 static int mdc_get_info(const struct lu_env *env, struct obd_export *exp,
2583                         __u32 keylen, void *key, __u32 *vallen, void *val)
2584 {
2585         int rc = -EINVAL;
2586
2587         if (KEY_IS(KEY_MAX_EASIZE)) {
2588                 __u32 mdsize, *max_easize;
2589
2590                 if (*vallen != sizeof(int))
2591                         RETURN(-EINVAL);
2592                 mdsize = *(__u32 *)val;
2593                 if (mdsize > exp->exp_obd->u.cli.cl_max_mds_easize)
2594                         exp->exp_obd->u.cli.cl_max_mds_easize = mdsize;
2595                 max_easize = val;
2596                 *max_easize = exp->exp_obd->u.cli.cl_max_mds_easize;
2597                 RETURN(0);
2598         } else if (KEY_IS(KEY_DEFAULT_EASIZE)) {
2599                 __u32 *default_easize;
2600
2601                 if (*vallen != sizeof(int))
2602                         RETURN(-EINVAL);
2603                 default_easize = val;
2604                 *default_easize = exp->exp_obd->u.cli.cl_default_mds_easize;
2605                 RETURN(0);
2606         } else if (KEY_IS(KEY_CONN_DATA)) {
2607                 struct obd_import *imp = class_exp2cliimp(exp);
2608                 struct obd_connect_data *data = val;
2609
2610                 if (*vallen != sizeof(*data))
2611                         RETURN(-EINVAL);
2612
2613                 *data = imp->imp_connect_data;
2614                 RETURN(0);
2615         } else if (KEY_IS(KEY_TGT_COUNT)) {
2616                 *((__u32 *)val) = 1;
2617                 RETURN(0);
2618         }
2619
2620         rc = mdc_get_info_rpc(exp, keylen, key, *vallen, val);
2621
2622         RETURN(rc);
2623 }
2624
2625 static int mdc_fsync(struct obd_export *exp, const struct lu_fid *fid,
2626                      struct ptlrpc_request **request)
2627 {
2628         struct ptlrpc_request *req;
2629         int                    rc;
2630         ENTRY;
2631
2632         *request = NULL;
2633         req = ptlrpc_request_alloc(class_exp2cliimp(exp), &RQF_MDS_SYNC);
2634         if (req == NULL)
2635                 RETURN(-ENOMEM);
2636
2637         rc = ptlrpc_request_pack(req, LUSTRE_MDS_VERSION, MDS_SYNC);
2638         if (rc) {
2639                 ptlrpc_request_free(req);
2640                 RETURN(rc);
2641         }
2642
2643         mdc_pack_body(&req->rq_pill, fid, 0, 0, -1, 0);
2644
2645         ptlrpc_request_set_replen(req);
2646
2647         rc = ptlrpc_queue_wait(req);
2648         if (rc)
2649                 ptlrpc_req_finished(req);
2650         else
2651                 *request = req;
2652         RETURN(rc);
2653 }
2654
2655 struct mdc_rmfid_args {
2656         int *mra_rcs;
2657         int mra_nr;
2658 };
2659
2660 int mdc_rmfid_interpret(const struct lu_env *env, struct ptlrpc_request *req,
2661                           void *args, int rc)
2662 {
2663         struct mdc_rmfid_args *aa;
2664         int *rcs, size;
2665         ENTRY;
2666
2667         if (!rc) {
2668                 aa = ptlrpc_req_async_args(aa, req);
2669
2670                 size = req_capsule_get_size(&req->rq_pill, &RMF_RCS,
2671                                             RCL_SERVER);
2672                 LASSERT(size == sizeof(int) * aa->mra_nr);
2673                 rcs = req_capsule_server_get(&req->rq_pill, &RMF_RCS);
2674                 LASSERT(rcs);
2675                 LASSERT(aa->mra_rcs);
2676                 LASSERT(aa->mra_nr);
2677                 memcpy(aa->mra_rcs, rcs, size);
2678         }
2679
2680         RETURN(rc);
2681 }
2682
2683 static int mdc_rmfid(struct obd_export *exp, struct fid_array *fa,
2684                      int *rcs, struct ptlrpc_request_set *set)
2685 {
2686         struct ptlrpc_request *req;
2687         struct mdc_rmfid_args *aa;
2688         struct mdt_body *b;
2689         struct lu_fid *tmp;
2690         int rc, flen;
2691         ENTRY;
2692
2693         req = ptlrpc_request_alloc(class_exp2cliimp(exp), &RQF_MDS_RMFID);
2694         if (req == NULL)
2695                 RETURN(-ENOMEM);
2696
2697         flen = fa->fa_nr * sizeof(struct lu_fid);
2698         req_capsule_set_size(&req->rq_pill, &RMF_FID_ARRAY,
2699                              RCL_CLIENT, flen);
2700         req_capsule_set_size(&req->rq_pill, &RMF_FID_ARRAY,
2701                              RCL_SERVER, flen);
2702         req_capsule_set_size(&req->rq_pill, &RMF_RCS,
2703                              RCL_SERVER, fa->fa_nr * sizeof(__u32));
2704         rc = ptlrpc_request_pack(req, LUSTRE_MDS_VERSION, MDS_RMFID);
2705         if (rc) {
2706                 ptlrpc_request_free(req);
2707                 RETURN(rc);
2708         }
2709         tmp = req_capsule_client_get(&req->rq_pill, &RMF_FID_ARRAY);
2710         memcpy(tmp, fa->fa_fids, flen);
2711
2712         mdc_pack_body(&req->rq_pill, NULL, 0, 0, -1, 0);
2713         b = req_capsule_client_get(&req->rq_pill, &RMF_MDT_BODY);
2714         b->mbo_ctime = ktime_get_real_seconds();
2715
2716         ptlrpc_request_set_replen(req);
2717
2718         LASSERT(rcs);
2719         aa = ptlrpc_req_async_args(aa, req);
2720         aa->mra_rcs = rcs;
2721         aa->mra_nr = fa->fa_nr;
2722         req->rq_interpret_reply = mdc_rmfid_interpret;
2723
2724         ptlrpc_set_add_req(set, req);
2725         ptlrpc_check_set(NULL, set);
2726
2727         RETURN(rc);
2728 }
2729
2730 static int mdc_import_event(struct obd_device *obd, struct obd_import *imp,
2731                             enum obd_import_event event)
2732 {
2733         struct client_obd *cli = &obd->u.cli;
2734         int rc = 0;
2735
2736         LASSERT(imp->imp_obd == obd);
2737
2738         switch (event) {
2739         case IMP_EVENT_DISCON:
2740                 spin_lock(&cli->cl_loi_list_lock);
2741                 cli->cl_avail_grant = 0;
2742                 cli->cl_lost_grant = 0;
2743                 spin_unlock(&cli->cl_loi_list_lock);
2744                 break;
2745         case IMP_EVENT_INACTIVE:
2746                 /*
2747                  * Flush current sequence to make client obtain new one
2748                  * from server in case of disconnect/reconnect.
2749                  */
2750                 down_read(&cli->cl_seq_rwsem);
2751                 if (cli->cl_seq)
2752                         seq_client_flush(cli->cl_seq);
2753                 up_read(&cli->cl_seq_rwsem);
2754
2755                 rc = obd_notify_observer(obd, obd, OBD_NOTIFY_INACTIVE);
2756                 break;
2757         case IMP_EVENT_INVALIDATE: {
2758                 struct ldlm_namespace *ns = obd->obd_namespace;
2759                 struct lu_env *env;
2760                 __u16 refcheck;
2761
2762                 ldlm_namespace_cleanup(ns, LDLM_FL_LOCAL_ONLY);
2763
2764                 env = cl_env_get(&refcheck);
2765                 if (!IS_ERR(env)) {
2766                         /* Reset grants. All pages go to failing rpcs due to
2767                          * the invalid import.
2768                          */
2769                         osc_io_unplug(env, cli, NULL);
2770
2771                         cfs_hash_for_each_nolock(ns->ns_rs_hash,
2772                                                  osc_ldlm_resource_invalidate,
2773                                                  env, 0);
2774                         cl_env_put(env, &refcheck);
2775                         ldlm_namespace_cleanup(ns, LDLM_FL_LOCAL_ONLY);
2776                 } else {
2777                         rc = PTR_ERR(env);
2778                 }
2779                 break;
2780         }
2781         case IMP_EVENT_ACTIVE:
2782                 rc = obd_notify_observer(obd, obd, OBD_NOTIFY_ACTIVE);
2783                 /* redo the kuc registration after reconnecting */
2784                 if (rc == 0)
2785                         rc = mdc_kuc_reregister(imp);
2786                 break;
2787         case IMP_EVENT_OCD: {
2788                 struct obd_connect_data *ocd = &imp->imp_connect_data;
2789
2790                 if (OCD_HAS_FLAG(ocd, GRANT))
2791                         osc_init_grant(cli, ocd);
2792
2793                 md_init_ea_size(obd->obd_self_export, ocd->ocd_max_easize, 0);
2794                 rc = obd_notify_observer(obd, obd, OBD_NOTIFY_OCD);
2795                 break;
2796         }
2797         case IMP_EVENT_DEACTIVATE:
2798         case IMP_EVENT_ACTIVATE:
2799                 break;
2800         default:
2801                 CERROR("Unknown import event %x\n", event);
2802                 LBUG();
2803         }
2804         RETURN(rc);
2805 }
2806
2807 int mdc_fid_alloc(const struct lu_env *env, struct obd_export *exp,
2808                   struct lu_fid *fid, struct md_op_data *op_data)
2809 {
2810         struct client_obd *cli = &exp->exp_obd->u.cli;
2811         int rc = -EIO;
2812
2813         ENTRY;
2814
2815         down_read(&cli->cl_seq_rwsem);
2816         if (cli->cl_seq)
2817                 rc = seq_client_alloc_fid(env, cli->cl_seq, fid);
2818         up_read(&cli->cl_seq_rwsem);
2819
2820         RETURN(rc);
2821 }
2822
2823 static struct obd_uuid *mdc_get_uuid(struct obd_export *exp)
2824 {
2825         struct client_obd *cli = &exp->exp_obd->u.cli;
2826         return &cli->cl_target_uuid;
2827 }
2828
2829 /**
2830  * Determine whether the lock can be canceled before replaying it during
2831  * recovery, non zero value will be return if the lock can be canceled,
2832  * or zero returned for not
2833  */
2834 static int mdc_cancel_weight(struct ldlm_lock *lock)
2835 {
2836         if (lock->l_resource->lr_type != LDLM_IBITS)
2837                 RETURN(0);
2838
2839         /* FIXME: if we ever get into a situation where there are too many
2840          * opened files with open locks on a single node, then we really
2841          * should replay these open locks to reget it */
2842         if (lock->l_policy_data.l_inodebits.bits & MDS_INODELOCK_OPEN)
2843                 RETURN(0);
2844
2845         /* Special case for DoM locks, cancel only unused and granted locks */
2846         if (ldlm_has_dom(lock) &&
2847             (lock->l_granted_mode != lock->l_req_mode ||
2848              osc_ldlm_weigh_ast(lock) != 0))
2849                 RETURN(0);
2850
2851         RETURN(1);
2852 }
2853
2854 static int mdc_resource_inode_free(struct ldlm_resource *res)
2855 {
2856         if (res->lr_lvb_inode)
2857                 res->lr_lvb_inode = NULL;
2858
2859         return 0;
2860 }
2861
2862 static struct ldlm_valblock_ops inode_lvbo = {
2863         .lvbo_free = mdc_resource_inode_free
2864 };
2865
2866 static int mdc_llog_init(struct obd_device *obd)
2867 {
2868         struct obd_llog_group   *olg = &obd->obd_olg;
2869         struct llog_ctxt        *ctxt;
2870         int                      rc;
2871
2872         ENTRY;
2873
2874         rc = llog_setup(NULL, obd, olg, LLOG_CHANGELOG_REPL_CTXT, obd,
2875                         &llog_client_ops);
2876         if (rc < 0)
2877                 RETURN(rc);
2878
2879         ctxt = llog_group_get_ctxt(olg, LLOG_CHANGELOG_REPL_CTXT);
2880         llog_initiator_connect(ctxt);
2881         llog_ctxt_put(ctxt);
2882
2883         RETURN(0);
2884 }
2885
2886 static void mdc_llog_finish(struct obd_device *obd)
2887 {
2888         struct llog_ctxt *ctxt;
2889
2890         ENTRY;
2891
2892         ctxt = llog_get_context(obd, LLOG_CHANGELOG_REPL_CTXT);
2893         if (ctxt != NULL)
2894                 llog_cleanup(NULL, ctxt);
2895
2896         EXIT;
2897 }
2898
2899 int mdc_setup(struct obd_device *obd, struct lustre_cfg *cfg)
2900 {
2901         int rc;
2902
2903         ENTRY;
2904
2905         rc = osc_setup_common(obd, cfg);
2906         if (rc < 0)
2907                 RETURN(rc);
2908
2909         rc = mdc_tunables_init(obd);
2910         if (rc)
2911                 GOTO(err_osc_cleanup, rc);
2912
2913         obd->u.cli.cl_dom_min_inline_repsize = MDC_DOM_DEF_INLINE_REPSIZE;
2914         obd->u.cli.cl_lsom_update = true;
2915
2916         ns_register_cancel(obd->obd_namespace, mdc_cancel_weight);
2917
2918         obd->obd_namespace->ns_lvbo = &inode_lvbo;
2919
2920         rc = mdc_llog_init(obd);
2921         if (rc) {
2922                 CERROR("%s: failed to setup llogging subsystems: rc = %d\n",
2923                        obd->obd_name, rc);
2924                 GOTO(err_llog_cleanup, rc);
2925         }
2926
2927         rc = mdc_changelog_cdev_init(obd);
2928         if (rc) {
2929                 CERROR("%s: failed to setup changelog char device: rc = %d\n",
2930                        obd->obd_name, rc);
2931                 GOTO(err_changelog_cleanup, rc);
2932         }
2933
2934         RETURN(rc);
2935
2936 err_changelog_cleanup:
2937         mdc_llog_finish(obd);
2938 err_llog_cleanup:
2939         lprocfs_free_md_stats(obd);
2940         ptlrpc_lprocfs_unregister_obd(obd);
2941 err_osc_cleanup:
2942         osc_cleanup_common(obd);
2943         return rc;
2944 }
2945
2946 /* Initialize the default and maximum LOV EA sizes.  This allows
2947  * us to make MDS RPCs with large enough reply buffers to hold a default
2948  * sized EA without having to calculate this (via a call into the
2949  * LOV + OSCs) each time we make an RPC.  The maximum size is also tracked
2950  * but not used to avoid wastefully vmalloc()'ing large reply buffers when
2951  * a large number of stripes is possible.  If a larger reply buffer is
2952  * required it will be reallocated in the ptlrpc layer due to overflow.
2953  */
2954 static int mdc_init_ea_size(struct obd_export *exp, __u32 easize,
2955                             __u32 def_easize)
2956 {
2957         struct obd_device *obd = exp->exp_obd;
2958         struct client_obd *cli = &obd->u.cli;
2959         ENTRY;
2960
2961         if (cli->cl_max_mds_easize < easize)
2962                 cli->cl_max_mds_easize = easize;
2963
2964         if (cli->cl_default_mds_easize < def_easize)
2965                 cli->cl_default_mds_easize = def_easize;
2966
2967         RETURN(0);
2968 }
2969
2970 static int mdc_precleanup(struct obd_device *obd)
2971 {
2972         ENTRY;
2973
2974         osc_precleanup_common(obd);
2975
2976         mdc_changelog_cdev_finish(obd);
2977         mdc_llog_finish(obd);
2978         lprocfs_free_md_stats(obd);
2979         ptlrpc_lprocfs_unregister_obd(obd);
2980
2981         RETURN(0);
2982 }
2983
2984 static int mdc_cleanup(struct obd_device *obd)
2985 {
2986         struct client_obd *cli = &obd->u.cli;
2987         LASSERT(cli->cl_mod_rpcs_in_flight == 0);
2988         return osc_cleanup_common(obd);
2989 }
2990
2991 static const struct obd_ops mdc_obd_ops = {
2992         .o_owner            = THIS_MODULE,
2993         .o_setup            = mdc_setup,
2994         .o_precleanup       = mdc_precleanup,
2995         .o_cleanup          = mdc_cleanup,
2996         .o_add_conn         = client_import_add_conn,
2997         .o_del_conn         = client_import_del_conn,
2998         .o_connect          = client_connect_import,
2999         .o_reconnect        = osc_reconnect,
3000         .o_disconnect       = osc_disconnect,
3001         .o_iocontrol        = mdc_iocontrol,
3002         .o_set_info_async   = mdc_set_info_async,
3003         .o_statfs           = mdc_statfs,
3004         .o_statfs_async     = mdc_statfs_async,
3005         .o_fid_init         = client_fid_init,
3006         .o_fid_fini         = client_fid_fini,
3007         .o_fid_alloc        = mdc_fid_alloc,
3008         .o_import_event     = mdc_import_event,
3009         .o_get_info         = mdc_get_info,
3010         .o_get_uuid         = mdc_get_uuid,
3011         .o_quotactl         = mdc_quotactl,
3012 };
3013
3014 static const struct md_ops mdc_md_ops = {
3015         .m_get_root         = mdc_get_root,
3016         .m_null_inode       = mdc_null_inode,
3017         .m_close            = mdc_close,
3018         .m_create           = mdc_create,
3019         .m_enqueue          = mdc_enqueue,
3020         .m_getattr          = mdc_getattr,
3021         .m_getattr_name     = mdc_getattr_name,
3022         .m_intent_lock      = mdc_intent_lock,
3023         .m_link             = mdc_link,
3024         .m_rename           = mdc_rename,
3025         .m_setattr          = mdc_setattr,
3026         .m_setxattr         = mdc_setxattr,
3027         .m_getxattr         = mdc_getxattr,
3028         .m_fsync                = mdc_fsync,
3029         .m_file_resync          = mdc_file_resync,
3030         .m_read_page            = mdc_read_page,
3031         .m_unlink           = mdc_unlink,
3032         .m_cancel_unused    = mdc_cancel_unused,
3033         .m_init_ea_size     = mdc_init_ea_size,
3034         .m_set_lock_data    = mdc_set_lock_data,
3035         .m_lock_match       = mdc_lock_match,
3036         .m_get_lustre_md    = mdc_get_lustre_md,
3037         .m_free_lustre_md   = mdc_free_lustre_md,
3038         .m_set_open_replay_data = mdc_set_open_replay_data,
3039         .m_clear_open_replay_data = mdc_clear_open_replay_data,
3040         .m_intent_getattr_async = mdc_intent_getattr_async,
3041         .m_revalidate_lock      = mdc_revalidate_lock,
3042         .m_rmfid                = mdc_rmfid,
3043         .m_batch_create         = cli_batch_create,
3044         .m_batch_stop           = cli_batch_stop,
3045         .m_batch_flush          = cli_batch_flush,
3046         .m_batch_add            = mdc_batch_add,
3047 };
3048
3049 dev_t mdc_changelog_dev;
3050 struct class *mdc_changelog_class;
3051 static int __init mdc_init(void)
3052 {
3053         int rc = 0;
3054         rc = alloc_chrdev_region(&mdc_changelog_dev, 0,
3055                                  MDC_CHANGELOG_DEV_COUNT,
3056                                  MDC_CHANGELOG_DEV_NAME);
3057         if (rc)
3058                 return rc;
3059
3060         mdc_changelog_class = class_create(THIS_MODULE, MDC_CHANGELOG_DEV_NAME);
3061         if (IS_ERR(mdc_changelog_class)) {
3062                 rc = PTR_ERR(mdc_changelog_class);
3063                 goto out_dev;
3064         }
3065
3066         rc = class_register_type(&mdc_obd_ops, &mdc_md_ops, true,
3067                                  LUSTRE_MDC_NAME, &mdc_device_type);
3068         if (rc)
3069                 goto out_class;
3070
3071         return 0;
3072
3073 out_class:
3074         class_destroy(mdc_changelog_class);
3075 out_dev:
3076         unregister_chrdev_region(mdc_changelog_dev, MDC_CHANGELOG_DEV_COUNT);
3077         return rc;
3078 }
3079
3080 static void __exit mdc_exit(void)
3081 {
3082         class_unregister_type(LUSTRE_MDC_NAME);
3083         class_destroy(mdc_changelog_class);
3084         unregister_chrdev_region(mdc_changelog_dev, MDC_CHANGELOG_DEV_COUNT);
3085         idr_destroy(&mdc_changelog_minor_idr);
3086 }
3087
3088 MODULE_AUTHOR("OpenSFS, Inc. <http://www.lustre.org/>");
3089 MODULE_DESCRIPTION("Lustre Metadata Client");
3090 MODULE_VERSION(LUSTRE_VERSION_STRING);
3091 MODULE_LICENSE("GPL");
3092
3093 module_init(mdc_init);
3094 module_exit(mdc_exit);