lustre/mdc/mdc_request.c

   1 /*
   2  * GPL HEADER START
   3  *
   4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 only,
   8  * as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * General Public License version 2 for more details (a copy is included
  14  * in the LICENSE file that accompanied this code).
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * version 2 along with this program; If not, see
  18  * http://www.gnu.org/licenses/gpl-2.0.html
  19  *
  20  * GPL HEADER END
  21  */
  22 /*
  23  * Copyright (c) 2001, 2010, Oracle and/or its affiliates. All rights reserved.
  24  * Use is subject to license terms.
  25  *
  26  * Copyright (c) 2011, 2017, Intel Corporation.
  27  */
  28 /*
  29  * This file is part of Lustre, http://www.lustre.org/
  30  * Lustre is a trademark of Sun Microsystems, Inc.
  31  */
  32
  33 #define DEBUG_SUBSYSTEM S_MDC
  34
  35 #include <linux/init.h>
  36 #include <linux/kthread.h>
  37 #include <linux/module.h>
  38 #include <linux/pagemap.h>
  39 #include <linux/user_namespace.h>
  40 #include <linux/utsname.h>
  41 #ifdef HAVE_UIDGID_HEADER
  42 # include <linux/uidgid.h>
  43 #endif
  44
  45 #include <lustre_errno.h>
  46
  47 #include <cl_object.h>
  48 #include <llog_swab.h>
  49 #include <lprocfs_status.h>
  50 #include <lustre_acl.h>
  51 #include <lustre_fid.h>
  52 #include <uapi/linux/lustre/lustre_ioctl.h>
  53 #include <lustre_kernelcomm.h>
  54 #include <lustre_lmv.h>
  55 #include <lustre_log.h>
  56 #include <uapi/linux/lustre/lustre_param.h>
  57 #include <lustre_swab.h>
  58 #include <obd_class.h>
  59 #include <lustre_osc.h>
  60
  61 #include "mdc_internal.h"
  62
  63 #define REQUEST_MINOR 244
  64
  65 static int mdc_cleanup(struct obd_device *obd);
  66
  67 static inline int mdc_queue_wait(struct ptlrpc_request *req)
  68 {
  69         struct client_obd *cli = &req->rq_import->imp_obd->u.cli;
  70         int rc;
  71
  72         /* obd_get_request_slot() ensures that this client has no more
  73          * than cl_max_rpcs_in_flight RPCs simultaneously inf light
  74          * against an MDT. */
  75         rc = obd_get_request_slot(cli);
  76         if (rc != 0)
  77                 return rc;
  78
  79         rc = ptlrpc_queue_wait(req);
  80         obd_put_request_slot(cli);
  81
  82         return rc;
  83 }
  84
  85 /*
  86  * Send MDS_GET_ROOT RPC to fetch root FID.
  87  *
  88  * If \a fileset is not NULL it should contain a subdirectory off
  89  * the ROOT/ directory to be mounted on the client. Return the FID
  90  * of the subdirectory to the client to mount onto its mountpoint.
  91  *
  92  * \param[in]   imp     MDC import
  93  * \param[in]   fileset fileset name, which could be NULL
  94  * \param[out]  rootfid root FID of this mountpoint
  95  * \param[out]  pc      root capa will be unpacked and saved in this pointer
  96  *
  97  * \retval      0 on success, negative errno on failure
  98  */
  99 static int mdc_get_root(struct obd_export *exp, const char *fileset,
 100                          struct lu_fid *rootfid)
 101 {
 102         struct ptlrpc_request   *req;
 103         struct mdt_body         *body;
 104         int                      rc;
 105
 106         ENTRY;
 107
 108         if (fileset && !(exp_connect_flags(exp) & OBD_CONNECT_SUBTREE))
 109                 RETURN(-ENOTSUPP);
 110
 111         req = ptlrpc_request_alloc(class_exp2cliimp(exp),
 112                                 &RQF_MDS_GET_ROOT);
 113         if (req == NULL)
 114                 RETURN(-ENOMEM);
 115
 116         if (fileset != NULL)
 117                 req_capsule_set_size(&req->rq_pill, &RMF_NAME, RCL_CLIENT,
 118                                      strlen(fileset) + 1);
 119         rc = ptlrpc_request_pack(req, LUSTRE_MDS_VERSION, MDS_GET_ROOT);
 120         if (rc) {
 121                 ptlrpc_request_free(req);
 122                 RETURN(rc);
 123         }
 124         mdc_pack_body(req, NULL, 0, 0, -1, 0);
 125         if (fileset != NULL) {
 126                 char *name = req_capsule_client_get(&req->rq_pill, &RMF_NAME);
 127
 128                 memcpy(name, fileset, strlen(fileset));
 129         }
 130         lustre_msg_add_flags(req->rq_reqmsg, LUSTRE_IMP_FULL);
 131         req->rq_send_state = LUSTRE_IMP_FULL;
 132
 133         ptlrpc_request_set_replen(req);
 134
 135         rc = ptlrpc_queue_wait(req);
 136         if (rc)
 137                 GOTO(out, rc);
 138
 139         body = req_capsule_server_get(&req->rq_pill, &RMF_MDT_BODY);
 140         if (body == NULL)
 141                 GOTO(out, rc = -EPROTO);
 142
 143         *rootfid = body->mbo_fid1;
 144         CDEBUG(D_NET, "root fid="DFID", last_committed=%llu\n",
 145                PFID(rootfid), lustre_msg_get_last_committed(req->rq_repmsg));
 146         EXIT;
 147 out:
 148         ptlrpc_req_finished(req);
 149
 150         return rc;
 151 }
 152
 153 /*
 154  * This function now is known to always saying that it will receive 4 buffers
 155  * from server. Even for cases when acl_size and md_size is zero, RPC header
 156  * will contain 4 fields and RPC itself will contain zero size fields. This is
 157  * because mdt_getattr*() _always_ returns 4 fields, but if acl is not needed
 158  * and thus zero, it shrinks it, making zero size. The same story about
 159  * md_size. And this is course of problem when client waits for smaller number
 160  * of fields. This issue will be fixed later when client gets aware of RPC
 161  * layouts.  --umka
 162  */
 163 static int mdc_getattr_common(struct obd_export *exp,
 164                               struct ptlrpc_request *req)
 165 {
 166         struct req_capsule *pill = &req->rq_pill;
 167         struct mdt_body    *body;
 168         void               *eadata;
 169         int                 rc;
 170         ENTRY;
 171
 172         /* Request message already built. */
 173         rc = ptlrpc_queue_wait(req);
 174         if (rc != 0)
 175                 RETURN(rc);
 176
 177         /* sanity check for the reply */
 178         body = req_capsule_server_get(pill, &RMF_MDT_BODY);
 179         if (body == NULL)
 180                 RETURN(-EPROTO);
 181
 182         CDEBUG(D_NET, "mode: %o\n", body->mbo_mode);
 183
 184         mdc_update_max_ea_from_body(exp, body);
 185         if (body->mbo_eadatasize != 0) {
 186                 eadata = req_capsule_server_sized_get(pill, &RMF_MDT_MD,
 187                                                       body->mbo_eadatasize);
 188                 if (eadata == NULL)
 189                         RETURN(-EPROTO);
 190         }
 191
 192         RETURN(0);
 193 }
 194
 195 static void mdc_reset_acl_req(struct ptlrpc_request *req)
 196 {
 197         spin_lock(&req->rq_early_free_lock);
 198         sptlrpc_cli_free_repbuf(req);
 199         req->rq_repbuf = NULL;
 200         req->rq_repbuf_len = 0;
 201         req->rq_repdata = NULL;
 202         req->rq_reqdata_len = 0;
 203         spin_unlock(&req->rq_early_free_lock);
 204 }
 205
 206 static int mdc_getattr(struct obd_export *exp, struct md_op_data *op_data,
 207                        struct ptlrpc_request **request)
 208 {
 209         struct ptlrpc_request *req;
 210         struct obd_import *imp = class_exp2cliimp(exp);
 211         __u32 acl_bufsize = LUSTRE_POSIX_ACL_MAX_SIZE_OLD;
 212         int rc;
 213         ENTRY;
 214
 215         /* Single MDS without an LMV case */
 216         if (op_data->op_flags & MF_GET_MDT_IDX) {
 217                 op_data->op_mds = 0;
 218                 RETURN(0);
 219         }
 220
 221         *request = NULL;
 222         req = ptlrpc_request_alloc(imp, &RQF_MDS_GETATTR);
 223         if (req == NULL)
 224                 RETURN(-ENOMEM);
 225
 226         rc = ptlrpc_request_pack(req, LUSTRE_MDS_VERSION, MDS_GETATTR);
 227         if (rc) {
 228                 ptlrpc_request_free(req);
 229                 RETURN(rc);
 230         }
 231
 232 again:
 233         mdc_pack_body(req, &op_data->op_fid1, op_data->op_valid,
 234                       op_data->op_mode, -1, 0);
 235         req_capsule_set_size(&req->rq_pill, &RMF_ACL, RCL_SERVER, acl_bufsize);
 236         req_capsule_set_size(&req->rq_pill, &RMF_MDT_MD, RCL_SERVER,
 237                              op_data->op_mode);
 238         ptlrpc_request_set_replen(req);
 239
 240         rc = mdc_getattr_common(exp, req);
 241         if (rc) {
 242                 if (rc == -ERANGE) {
 243                         acl_bufsize = MIN(imp->imp_connect_data.ocd_max_easize,
 244                                           XATTR_SIZE_MAX);
 245                         mdc_reset_acl_req(req);
 246                         goto again;
 247                 }
 248
 249                 ptlrpc_req_finished(req);
 250         } else {
 251                 *request = req;
 252         }
 253
 254         RETURN(rc);
 255 }
 256
 257 static int mdc_getattr_name(struct obd_export *exp, struct md_op_data *op_data,
 258                             struct ptlrpc_request **request)
 259 {
 260         struct ptlrpc_request *req;
 261         struct obd_import *imp = class_exp2cliimp(exp);
 262         __u32 acl_bufsize = LUSTRE_POSIX_ACL_MAX_SIZE_OLD;
 263         int rc;
 264         ENTRY;
 265
 266         *request = NULL;
 267         req = ptlrpc_request_alloc(imp, &RQF_MDS_GETATTR_NAME);
 268         if (req == NULL)
 269                 RETURN(-ENOMEM);
 270
 271         req_capsule_set_size(&req->rq_pill, &RMF_NAME, RCL_CLIENT,
 272                              op_data->op_namelen + 1);
 273
 274         rc = ptlrpc_request_pack(req, LUSTRE_MDS_VERSION, MDS_GETATTR_NAME);
 275         if (rc) {
 276                 ptlrpc_request_free(req);
 277                 RETURN(rc);
 278         }
 279
 280         if (op_data->op_name) {
 281                 char *name = req_capsule_client_get(&req->rq_pill, &RMF_NAME);
 282                 LASSERT(strnlen(op_data->op_name, op_data->op_namelen) ==
 283                                 op_data->op_namelen);
 284                 memcpy(name, op_data->op_name, op_data->op_namelen);
 285         }
 286
 287 again:
 288         mdc_pack_body(req, &op_data->op_fid1, op_data->op_valid,
 289                       op_data->op_mode, op_data->op_suppgids[0], 0);
 290         req_capsule_set_size(&req->rq_pill, &RMF_MDT_MD, RCL_SERVER,
 291                              op_data->op_mode);
 292         req_capsule_set_size(&req->rq_pill, &RMF_ACL, RCL_SERVER, acl_bufsize);
 293         ptlrpc_request_set_replen(req);
 294
 295         rc = mdc_getattr_common(exp, req);
 296         if (rc) {
 297                 if (rc == -ERANGE) {
 298                         acl_bufsize = MIN(imp->imp_connect_data.ocd_max_easize,
 299                                           XATTR_SIZE_MAX);
 300                         mdc_reset_acl_req(req);
 301                         goto again;
 302                 }
 303
 304                 ptlrpc_req_finished(req);
 305         } else {
 306                 *request = req;
 307         }
 308
 309         RETURN(rc);
 310 }
 311
 312 static int mdc_xattr_common(struct obd_export *exp,const struct req_format *fmt,
 313                             const struct lu_fid *fid, int opcode, u64 valid,
 314                             const char *xattr_name, const char *input,
 315                             int input_size, int output_size, int flags,
 316                             __u32 suppgid, struct ptlrpc_request **request)
 317 {
 318         struct ptlrpc_request *req;
 319         int   xattr_namelen = 0;
 320         char *tmp;
 321         int   rc;
 322         ENTRY;
 323
 324         *request = NULL;
 325         req = ptlrpc_request_alloc(class_exp2cliimp(exp), fmt);
 326         if (req == NULL)
 327                 RETURN(-ENOMEM);
 328
 329         if (xattr_name) {
 330                 xattr_namelen = strlen(xattr_name) + 1;
 331                 req_capsule_set_size(&req->rq_pill, &RMF_NAME, RCL_CLIENT,
 332                                      xattr_namelen);
 333         }
 334         if (input_size) {
 335                 LASSERT(input);
 336                 req_capsule_set_size(&req->rq_pill, &RMF_EADATA, RCL_CLIENT,
 337                                      input_size);
 338         }
 339
 340         /* Flush local XATTR locks to get rid of a possible cancel RPC */
 341         if (opcode == MDS_REINT && fid_is_sane(fid) &&
 342             exp->exp_connect_data.ocd_ibits_known & MDS_INODELOCK_XATTR) {
 343                 struct list_head cancels = LIST_HEAD_INIT(cancels);
 344                 int count;
 345
 346                 /* Without that packing would fail */
 347                 if (input_size == 0)
 348                         req_capsule_set_size(&req->rq_pill, &RMF_EADATA,
 349                                              RCL_CLIENT, 0);
 350
 351                 count = mdc_resource_get_unused(exp, fid,
 352                                                 &cancels, LCK_EX,
 353                                                 MDS_INODELOCK_XATTR);
 354
 355                 rc = mdc_prep_elc_req(exp, req, MDS_REINT, &cancels, count);
 356                 if (rc) {
 357                         ptlrpc_request_free(req);
 358                         RETURN(rc);
 359                 }
 360         } else {
 361                 rc = ptlrpc_request_pack(req, LUSTRE_MDS_VERSION, opcode);
 362                 if (rc) {
 363                         ptlrpc_request_free(req);
 364                         RETURN(rc);
 365                 }
 366         }
 367
 368         if (opcode == MDS_REINT) {
 369                 struct mdt_rec_setxattr *rec;
 370
 371                 CLASSERT(sizeof(struct mdt_rec_setxattr) ==
 372                          sizeof(struct mdt_rec_reint));
 373                 rec = req_capsule_client_get(&req->rq_pill, &RMF_REC_REINT);
 374                 rec->sx_opcode = REINT_SETXATTR;
 375                 rec->sx_fsuid  = from_kuid(&init_user_ns, current_fsuid());
 376                 rec->sx_fsgid  = from_kgid(&init_user_ns, current_fsgid());
 377                 rec->sx_cap    = cfs_curproc_cap_pack();
 378                 rec->sx_suppgid1 = suppgid;
 379                 rec->sx_suppgid2 = -1;
 380                 rec->sx_fid    = *fid;
 381                 rec->sx_valid  = valid | OBD_MD_FLCTIME;
 382                 rec->sx_time   = ktime_get_real_seconds();
 383                 rec->sx_size   = output_size;
 384                 rec->sx_flags  = flags;
 385         } else {
 386                 mdc_pack_body(req, fid, valid, output_size, suppgid, flags);
 387         }
 388
 389         if (xattr_name) {
 390                 tmp = req_capsule_client_get(&req->rq_pill, &RMF_NAME);
 391                 memcpy(tmp, xattr_name, xattr_namelen);
 392         }
 393         if (input_size) {
 394                 tmp = req_capsule_client_get(&req->rq_pill, &RMF_EADATA);
 395                 memcpy(tmp, input, input_size);
 396         }
 397
 398         if (req_capsule_has_field(&req->rq_pill, &RMF_EADATA, RCL_SERVER))
 399                 req_capsule_set_size(&req->rq_pill, &RMF_EADATA,
 400                                      RCL_SERVER, output_size);
 401         ptlrpc_request_set_replen(req);
 402
 403         /* make rpc */
 404         if (opcode == MDS_REINT)
 405                 mdc_get_mod_rpc_slot(req, NULL);
 406
 407         rc = ptlrpc_queue_wait(req);
 408
 409         if (opcode == MDS_REINT)
 410                 mdc_put_mod_rpc_slot(req, NULL);
 411
 412         if (rc)
 413                 ptlrpc_req_finished(req);
 414         else
 415                 *request = req;
 416         RETURN(rc);
 417 }
 418
 419 static int mdc_setxattr(struct obd_export *exp, const struct lu_fid *fid,
 420                         u64 obd_md_valid, const char *name,
 421                         const void *value, size_t value_size,
 422                         unsigned int xattr_flags, u32 suppgid,
 423                         struct ptlrpc_request **req)
 424 {
 425         LASSERT(obd_md_valid == OBD_MD_FLXATTR ||
 426                 obd_md_valid == OBD_MD_FLXATTRRM);
 427
 428         return mdc_xattr_common(exp, &RQF_MDS_REINT_SETXATTR,
 429                                 fid, MDS_REINT, obd_md_valid, name,
 430                                 value, value_size, 0, xattr_flags, suppgid,
 431                                 req);
 432 }
 433
 434 static int mdc_getxattr(struct obd_export *exp, const struct lu_fid *fid,
 435                         u64 obd_md_valid, const char *name, size_t buf_size,
 436                         struct ptlrpc_request **req)
 437 {
 438         struct mdt_body *body;
 439         int rc;
 440
 441         LASSERT(obd_md_valid == OBD_MD_FLXATTR ||
 442                 obd_md_valid == OBD_MD_FLXATTRLS);
 443
 444         rc = mdc_xattr_common(exp, &RQF_MDS_GETXATTR, fid, MDS_GETXATTR,
 445                               obd_md_valid, name, NULL, 0, buf_size, 0, -1,
 446                               req);
 447         if (rc < 0)
 448                 GOTO(out, rc);
 449
 450         body = req_capsule_server_get(&(*req)->rq_pill, &RMF_MDT_BODY);
 451         if (body == NULL)
 452                 GOTO(out, rc = -EPROTO);
 453
 454         /* only detect the xattr size */
 455         if (buf_size == 0) {
 456                 /* LU-11109: Older MDTs do not distinguish
 457                  * between nonexistent xattrs and zero length
 458                  * values in this case. Newer MDTs will return
 459                  * -ENODATA or set OBD_MD_FLXATTR. */
 460                 GOTO(out, rc = body->mbo_eadatasize);
 461         }
 462
 463         if (body->mbo_eadatasize == 0) {
 464                 /* LU-11109: Newer MDTs set OBD_MD_FLXATTR on
 465                  * success so that we can distinguish between
 466                  * zero length value and nonexistent xattr.
 467                  *
 468                  * If OBD_MD_FLXATTR is not set then we keep
 469                  * the old behavior and return -ENODATA for
 470                  * getxattr() when mbo_eadatasize is 0. But
 471                  * -ENODATA only makes sense for getxattr()
 472                  * and not for listxattr(). */
 473                 if (body->mbo_valid & OBD_MD_FLXATTR)
 474                         GOTO(out, rc = 0);
 475                 else if (obd_md_valid == OBD_MD_FLXATTR)
 476                         GOTO(out, rc = -ENODATA);
 477                 else
 478                         GOTO(out, rc = 0);
 479         }
 480
 481         GOTO(out, rc = body->mbo_eadatasize);
 482 out:
 483         if (rc < 0) {
 484                 ptlrpc_req_finished(*req);
 485                 *req = NULL;
 486         }
 487
 488         return rc;
 489 }
 490
 491 #ifdef CONFIG_FS_POSIX_ACL
 492 static int mdc_unpack_acl(struct ptlrpc_request *req, struct lustre_md *md)
 493 {
 494         struct req_capsule     *pill = &req->rq_pill;
 495         struct mdt_body        *body = md->body;
 496         struct posix_acl       *acl;
 497         void                   *buf;
 498         int                     rc;
 499         ENTRY;
 500
 501         if (!body->mbo_aclsize)
 502                 RETURN(0);
 503
 504         buf = req_capsule_server_sized_get(pill, &RMF_ACL, body->mbo_aclsize);
 505
 506         if (!buf)
 507                 RETURN(-EPROTO);
 508
 509         acl = posix_acl_from_xattr(&init_user_ns, buf, body->mbo_aclsize);
 510         if (acl == NULL)
 511                 RETURN(0);
 512         if (IS_ERR(acl)) {
 513                 rc = PTR_ERR(acl);
 514                 CERROR("convert xattr to acl: %d\n", rc);
 515                 RETURN(rc);
 516         }
 517
 518         rc = posix_acl_valid(&init_user_ns, acl);
 519         if (rc) {
 520                 CERROR("validate acl: %d\n", rc);
 521                 posix_acl_release(acl);
 522                 RETURN(rc);
 523         }
 524
 525         md->posix_acl = acl;
 526         RETURN(0);
 527 }
 528 #else
 529 #define mdc_unpack_acl(req, md) 0
 530 #endif
 531
 532 int mdc_get_lustre_md(struct obd_export *exp, struct ptlrpc_request *req,
 533                       struct obd_export *dt_exp, struct obd_export *md_exp,
 534                       struct lustre_md *md)
 535 {
 536         struct req_capsule *pill = &req->rq_pill;
 537         int rc;
 538         ENTRY;
 539
 540         LASSERT(md);
 541         memset(md, 0, sizeof(*md));
 542
 543         md->body = req_capsule_server_get(pill, &RMF_MDT_BODY);
 544         LASSERT(md->body != NULL);
 545
 546         if (md->body->mbo_valid & OBD_MD_FLEASIZE) {
 547                 if (!S_ISREG(md->body->mbo_mode)) {
 548                         CDEBUG(D_INFO, "OBD_MD_FLEASIZE set, should be a "
 549                                "regular file, but is not\n");
 550                         GOTO(out, rc = -EPROTO);
 551                 }
 552
 553                 if (md->body->mbo_eadatasize == 0) {
 554                         CDEBUG(D_INFO, "OBD_MD_FLEASIZE set, "
 555                                "but eadatasize 0\n");
 556                         GOTO(out, rc = -EPROTO);
 557                 }
 558
 559                 md->layout.lb_len = md->body->mbo_eadatasize;
 560                 md->layout.lb_buf = req_capsule_server_sized_get(pill,
 561                                                         &RMF_MDT_MD,
 562                                                         md->layout.lb_len);
 563                 if (md->layout.lb_buf == NULL)
 564                         GOTO(out, rc = -EPROTO);
 565         } else if (md->body->mbo_valid & OBD_MD_FLDIREA) {
 566                 const union lmv_mds_md *lmv;
 567                 size_t lmv_size;
 568
 569                 if (!S_ISDIR(md->body->mbo_mode)) {
 570                         CDEBUG(D_INFO, "OBD_MD_FLDIREA set, should be a "
 571                                "directory, but is not\n");
 572                         GOTO(out, rc = -EPROTO);
 573                 }
 574
 575                 lmv_size = md->body->mbo_eadatasize;
 576                 if (lmv_size == 0) {
 577                         CDEBUG(D_INFO, "OBD_MD_FLDIREA is set, "
 578                                "but eadatasize 0\n");
 579                         RETURN(-EPROTO);
 580                 }
 581
 582                 if (md->body->mbo_valid & OBD_MD_MEA) {
 583                         lmv = req_capsule_server_sized_get(pill, &RMF_MDT_MD,
 584                                                            lmv_size);
 585                         if (lmv == NULL)
 586                                 GOTO(out, rc = -EPROTO);
 587
 588                         rc = md_unpackmd(md_exp, &md->lmv, lmv, lmv_size);
 589                         if (rc < 0)
 590                                 GOTO(out, rc);
 591
 592                         if (rc < (typeof(rc))sizeof(*md->lmv)) {
 593                                 CDEBUG(D_INFO, "size too small:  "
 594                                        "rc < sizeof(*md->lmv) (%d < %d)\n",
 595                                         rc, (int)sizeof(*md->lmv));
 596                                 GOTO(out, rc = -EPROTO);
 597                         }
 598                 }
 599         }
 600         rc = 0;
 601
 602         if (md->body->mbo_valid & OBD_MD_FLACL) {
 603                 /* for ACL, it's possible that FLACL is set but aclsize is zero.
 604                  * only when aclsize != 0 there's an actual segment for ACL
 605                  * in reply buffer.
 606                  */
 607                 if (md->body->mbo_aclsize) {
 608                         rc = mdc_unpack_acl(req, md);
 609                         if (rc)
 610                                 GOTO(out, rc);
 611 #ifdef CONFIG_FS_POSIX_ACL
 612                 } else {
 613                         md->posix_acl = NULL;
 614 #endif
 615                 }
 616         }
 617
 618         EXIT;
 619 out:
 620         if (rc) {
 621 #ifdef CONFIG_FS_POSIX_ACL
 622                 posix_acl_release(md->posix_acl);
 623 #endif
 624         }
 625         return rc;
 626 }
 627
 628 int mdc_free_lustre_md(struct obd_export *exp, struct lustre_md *md)
 629 {
 630         ENTRY;
 631         RETURN(0);
 632 }
 633
 634 void mdc_replay_open(struct ptlrpc_request *req)
 635 {
 636         struct md_open_data *mod = req->rq_cb_data;
 637         struct ptlrpc_request *close_req;
 638         struct obd_client_handle *och;
 639         struct lustre_handle old_open_handle = { };
 640         struct mdt_body *body;
 641         ENTRY;
 642
 643         if (mod == NULL) {
 644                 DEBUG_REQ(D_ERROR, req,
 645                           "Can't properly replay without open data.");
 646                 EXIT;
 647                 return;
 648         }
 649
 650         body = req_capsule_server_get(&req->rq_pill, &RMF_MDT_BODY);
 651         LASSERT(body != NULL);
 652
 653         spin_lock(&req->rq_lock);
 654         och = mod->mod_och;
 655         if (och && och->och_open_handle.cookie)
 656                 req->rq_early_free_repbuf = 1;
 657         else
 658                 req->rq_early_free_repbuf = 0;
 659         spin_unlock(&req->rq_lock);
 660
 661         if (req->rq_early_free_repbuf) {
 662                 struct lustre_handle *file_open_handle;
 663
 664                 LASSERT(och->och_magic == OBD_CLIENT_HANDLE_MAGIC);
 665
 666                 file_open_handle = &och->och_open_handle;
 667                 CDEBUG(D_HA, "updating handle from %#llx to %#llx\n",
 668                        file_open_handle->cookie, body->mbo_open_handle.cookie);
 669                 old_open_handle = *file_open_handle;
 670                 *file_open_handle = body->mbo_open_handle;
 671         }
 672
 673         close_req = mod->mod_close_req;
 674         if (close_req) {
 675                 __u32 opc = lustre_msg_get_opc(close_req->rq_reqmsg);
 676                 struct mdt_ioepoch *epoch;
 677
 678                 LASSERT(opc == MDS_CLOSE);
 679                 epoch = req_capsule_client_get(&close_req->rq_pill,
 680                                                &RMF_MDT_EPOCH);
 681                 LASSERT(epoch);
 682
 683                 if (req->rq_early_free_repbuf)
 684                         LASSERT(old_open_handle.cookie ==
 685                                 epoch->mio_open_handle.cookie);
 686
 687                 DEBUG_REQ(D_HA, close_req, "updating close body with new fh");
 688                 epoch->mio_open_handle = body->mbo_open_handle;
 689         }
 690         EXIT;
 691 }
 692
 693 void mdc_commit_open(struct ptlrpc_request *req)
 694 {
 695         struct md_open_data *mod = req->rq_cb_data;
 696         if (mod == NULL)
 697                 return;
 698
 699         /**
 700          * No need to touch md_open_data::mod_och, it holds a reference on
 701          * \var mod and will zero references to each other, \var mod will be
 702          * freed after that when md_open_data::mod_och will put the reference.
 703          */
 704
 705         /**
 706          * Do not let open request to disappear as it still may be needed
 707          * for close rpc to happen (it may happen on evict only, otherwise
 708          * ptlrpc_request::rq_replay does not let mdc_commit_open() to be
 709          * called), just mark this rpc as committed to distinguish these 2
 710          * cases, see mdc_close() for details. The open request reference will
 711          * be put along with freeing \var mod.
 712          */
 713         ptlrpc_request_addref(req);
 714         spin_lock(&req->rq_lock);
 715         req->rq_committed = 1;
 716         spin_unlock(&req->rq_lock);
 717         req->rq_cb_data = NULL;
 718         obd_mod_put(mod);
 719 }
 720
 721 int mdc_set_open_replay_data(struct obd_export *exp,
 722                              struct obd_client_handle *och,
 723                              struct lookup_intent *it)
 724 {
 725         struct md_open_data     *mod;
 726         struct mdt_rec_create   *rec;
 727         struct mdt_body         *body;
 728         struct ptlrpc_request   *open_req = it->it_request;
 729         struct obd_import       *imp = open_req->rq_import;
 730         ENTRY;
 731
 732         if (!open_req->rq_replay)
 733                 RETURN(0);
 734
 735         rec = req_capsule_client_get(&open_req->rq_pill, &RMF_REC_REINT);
 736         body = req_capsule_server_get(&open_req->rq_pill, &RMF_MDT_BODY);
 737         LASSERT(rec != NULL);
 738         /* Incoming message in my byte order (it's been swabbed). */
 739         /* Outgoing messages always in my byte order. */
 740         LASSERT(body != NULL);
 741
 742         /* Only if the import is replayable, we set replay_open data */
 743         if (och && imp->imp_replayable) {
 744                 mod = obd_mod_alloc();
 745                 if (mod == NULL) {
 746                         DEBUG_REQ(D_ERROR, open_req,
 747                                   "Can't allocate md_open_data");
 748                         RETURN(0);
 749                 }
 750
 751                 /**
 752                  * Take a reference on \var mod, to be freed on mdc_close().
 753                  * It protects \var mod from being freed on eviction (commit
 754                  * callback is called despite rq_replay flag).
 755                  * Another reference for \var och.
 756                  */
 757                 obd_mod_get(mod);
 758                 obd_mod_get(mod);
 759
 760                 spin_lock(&open_req->rq_lock);
 761                 och->och_mod = mod;
 762                 mod->mod_och = och;
 763                 mod->mod_is_create = it_disposition(it, DISP_OPEN_CREATE) ||
 764                                      it_disposition(it, DISP_OPEN_STRIPE);
 765                 mod->mod_open_req = open_req;
 766                 open_req->rq_cb_data = mod;
 767                 open_req->rq_commit_cb = mdc_commit_open;
 768                 open_req->rq_early_free_repbuf = 1;
 769                 spin_unlock(&open_req->rq_lock);
 770         }
 771
 772         rec->cr_fid2 = body->mbo_fid1;
 773         rec->cr_open_handle_old = body->mbo_open_handle;
 774         open_req->rq_replay_cb = mdc_replay_open;
 775         if (!fid_is_sane(&body->mbo_fid1)) {
 776                 DEBUG_REQ(D_ERROR, open_req,
 777                           "saving replay request with insane FID " DFID,
 778                           PFID(&body->mbo_fid1));
 779                 LBUG();
 780         }
 781
 782         DEBUG_REQ(D_RPCTRACE, open_req, "Set up open replay data");
 783         RETURN(0);
 784 }
 785
 786 static void mdc_free_open(struct md_open_data *mod)
 787 {
 788         int committed = 0;
 789
 790         if (mod->mod_is_create == 0 &&
 791             imp_connect_disp_stripe(mod->mod_open_req->rq_import))
 792                 committed = 1;
 793
 794         /**
 795          * No reason to asssert here if the open request has
 796          * rq_replay == 1. It means that mdc_close failed, and
 797          * close request wasn`t sent. It is not fatal to client.
 798          * The worst thing is eviction if the client gets open lock
 799          **/
 800
 801         DEBUG_REQ(D_RPCTRACE, mod->mod_open_req, "free open request rq_replay"
 802                   "= %d\n", mod->mod_open_req->rq_replay);
 803
 804         ptlrpc_request_committed(mod->mod_open_req, committed);
 805         if (mod->mod_close_req)
 806                 ptlrpc_request_committed(mod->mod_close_req, committed);
 807 }
 808
 809 int mdc_clear_open_replay_data(struct obd_export *exp,
 810                                struct obd_client_handle *och)
 811 {
 812         struct md_open_data *mod = och->och_mod;
 813         ENTRY;
 814
 815         /**
 816          * It is possible to not have \var mod in a case of eviction between
 817          * lookup and ll_file_open().
 818          **/
 819         if (mod == NULL)
 820                 RETURN(0);
 821
 822         LASSERT(mod != LP_POISON);
 823         LASSERT(mod->mod_open_req != NULL);
 824
 825         spin_lock(&mod->mod_open_req->rq_lock);
 826         if (mod->mod_och)
 827                 mod->mod_och->och_open_handle.cookie = 0;
 828         mod->mod_open_req->rq_early_free_repbuf = 0;
 829         spin_unlock(&mod->mod_open_req->rq_lock);
 830         mdc_free_open(mod);
 831
 832         mod->mod_och = NULL;
 833         och->och_mod = NULL;
 834         obd_mod_put(mod);
 835
 836         RETURN(0);
 837 }
 838
 839 static int mdc_close(struct obd_export *exp, struct md_op_data *op_data,
 840                      struct md_open_data *mod, struct ptlrpc_request **request)
 841 {
 842         struct obd_device     *obd = class_exp2obd(exp);
 843         struct ptlrpc_request *req;
 844         struct req_format     *req_fmt;
 845         size_t                 u32_count = 0;
 846         int                    rc;
 847         int                    saved_rc = 0;
 848         ENTRY;
 849
 850         CDEBUG(D_INODE, "%s: "DFID" file closed with intent: %x\n",
 851                exp->exp_obd->obd_name, PFID(&op_data->op_fid1),
 852                op_data->op_bias);
 853
 854         if (op_data->op_bias & MDS_CLOSE_INTENT) {
 855                 req_fmt = &RQF_MDS_CLOSE_INTENT;
 856                 if (op_data->op_bias & MDS_HSM_RELEASE) {
 857                         /* allocate a FID for volatile file */
 858                         rc = mdc_fid_alloc(NULL, exp, &op_data->op_fid2,
 859                                            op_data);
 860                         if (rc < 0) {
 861                                 CERROR("%s: "DFID" allocating FID: rc = %d\n",
 862                                        obd->obd_name, PFID(&op_data->op_fid1),
 863                                        rc);
 864                                 /* save the errcode and proceed to close */
 865                                 saved_rc = rc;
 866                         }
 867                 }
 868                 if (op_data->op_bias & MDS_CLOSE_RESYNC_DONE) {
 869                         size_t count = op_data->op_data_size / sizeof(__u32);
 870
 871                         if (count > INLINE_RESYNC_ARRAY_SIZE)
 872                                 u32_count = count;
 873                 }
 874         } else {
 875                 req_fmt = &RQF_MDS_CLOSE;
 876         }
 877
 878         *request = NULL;
 879         if (OBD_FAIL_CHECK(OBD_FAIL_MDC_CLOSE))
 880                 req = NULL;
 881         else
 882                 req = ptlrpc_request_alloc(class_exp2cliimp(exp), req_fmt);
 883
 884         /* Ensure that this close's handle is fixed up during replay. */
 885         if (likely(mod != NULL)) {
 886                 LASSERTF(mod->mod_open_req != NULL &&
 887                          mod->mod_open_req->rq_type != LI_POISON,
 888                          "POISONED open %p!\n", mod->mod_open_req);
 889
 890                 mod->mod_close_req = req;
 891
 892                 DEBUG_REQ(D_HA, mod->mod_open_req, "matched open");
 893                 /* We no longer want to preserve this open for replay even
 894                  * though the open was committed. b=3632, b=3633 */
 895                 spin_lock(&mod->mod_open_req->rq_lock);
 896                 mod->mod_open_req->rq_replay = 0;
 897                 spin_unlock(&mod->mod_open_req->rq_lock);
 898         } else {
 899                 CDEBUG(D_HA, "couldn't find open req; expecting close error\n");
 900         }
 901         if (req == NULL) {
 902                 /**
 903                  * TODO: repeat close after errors
 904                  */
 905                 CWARN("%s: close of FID "DFID" failed, file reference will be "
 906                       "dropped when this client unmounts or is evicted\n",
 907                       obd->obd_name, PFID(&op_data->op_fid1));
 908                 GOTO(out, rc = -ENOMEM);
 909         }
 910
 911         if (u32_count > 0)
 912                 req_capsule_set_size(&req->rq_pill, &RMF_U32, RCL_CLIENT,
 913                                      u32_count * sizeof(__u32));
 914
 915         rc = ptlrpc_request_pack(req, LUSTRE_MDS_VERSION, MDS_CLOSE);
 916         if (rc) {
 917                 ptlrpc_request_free(req);
 918                 req = NULL;
 919                 GOTO(out, rc);
 920         }
 921
 922         /* To avoid a livelock (bug 7034), we need to send CLOSE RPCs to a
 923          * portal whose threads are not taking any DLM locks and are therefore
 924          * always progressing */
 925         req->rq_request_portal = MDS_READPAGE_PORTAL;
 926         ptlrpc_at_set_req_timeout(req);
 927
 928
 929         mdc_close_pack(req, op_data);
 930
 931         req_capsule_set_size(&req->rq_pill, &RMF_MDT_MD, RCL_SERVER,
 932                              obd->u.cli.cl_default_mds_easize);
 933
 934         ptlrpc_request_set_replen(req);
 935
 936         mdc_get_mod_rpc_slot(req, NULL);
 937         rc = ptlrpc_queue_wait(req);
 938         mdc_put_mod_rpc_slot(req, NULL);
 939
 940         if (req->rq_repmsg == NULL) {
 941                 CDEBUG(D_RPCTRACE, "request failed to send: %p, %d\n", req,
 942                        req->rq_status);
 943                 if (rc == 0)
 944                         rc = req->rq_status ?: -EIO;
 945         } else if (rc == 0 || rc == -EAGAIN) {
 946                 struct mdt_body *body;
 947
 948                 rc = lustre_msg_get_status(req->rq_repmsg);
 949                 if (lustre_msg_get_type(req->rq_repmsg) == PTL_RPC_MSG_ERR) {
 950                         DEBUG_REQ(D_ERROR, req, "type == PTL_RPC_MSG_ERR, err "
 951                                   "= %d", rc);
 952                         if (rc > 0)
 953                                 rc = -rc;
 954                 }
 955                 body = req_capsule_server_get(&req->rq_pill, &RMF_MDT_BODY);
 956                 if (body == NULL)
 957                         rc = -EPROTO;
 958         } else if (rc == -ESTALE) {
 959                 /**
 960                  * it can be allowed error after 3633 if open was committed and
 961                  * server failed before close was sent. Let's check if mod
 962                  * exists and return no error in that case
 963                  */
 964                 if (mod) {
 965                         DEBUG_REQ(D_HA, req, "Reset ESTALE = %d", rc);
 966                         LASSERT(mod->mod_open_req != NULL);
 967                         if (mod->mod_open_req->rq_committed)
 968                                 rc = 0;
 969                 }
 970         }
 971
 972 out:
 973         if (mod) {
 974                 if (rc != 0)
 975                         mod->mod_close_req = NULL;
 976                 /* Since now, mod is accessed through open_req only,
 977                  * thus close req does not keep a reference on mod anymore. */
 978                 obd_mod_put(mod);
 979         }
 980         *request = req;
 981
 982         RETURN(rc < 0 ? rc : saved_rc);
 983 }
 984
 985 static int mdc_getpage(struct obd_export *exp, const struct lu_fid *fid,
 986                        u64 offset, struct page **pages, int npages,
 987                        struct ptlrpc_request **request)
 988 {
 989         struct ptlrpc_request   *req;
 990         struct ptlrpc_bulk_desc *desc;
 991         int                      i;
 992         wait_queue_head_t        waitq;
 993         int                      resends = 0;
 994         struct l_wait_info       lwi;
 995         int                      rc;
 996         ENTRY;
 997
 998         *request = NULL;
 999         init_waitqueue_head(&waitq);
1000
1001 restart_bulk:
1002         req = ptlrpc_request_alloc(class_exp2cliimp(exp), &RQF_MDS_READPAGE);
1003         if (req == NULL)
1004                 RETURN(-ENOMEM);
1005
1006         rc = ptlrpc_request_pack(req, LUSTRE_MDS_VERSION, MDS_READPAGE);
1007         if (rc) {
1008                 ptlrpc_request_free(req);
1009                 RETURN(rc);
1010         }
1011
1012         req->rq_request_portal = MDS_READPAGE_PORTAL;
1013         ptlrpc_at_set_req_timeout(req);
1014
1015         desc = ptlrpc_prep_bulk_imp(req, npages, 1,
1016                                     PTLRPC_BULK_PUT_SINK | PTLRPC_BULK_BUF_KIOV,
1017                                     MDS_BULK_PORTAL,
1018                                     &ptlrpc_bulk_kiov_pin_ops);
1019         if (desc == NULL) {
1020                 ptlrpc_req_finished(req);
1021                 RETURN(-ENOMEM);
1022         }
1023
1024         /* NB req now owns desc and will free it when it gets freed */
1025         for (i = 0; i < npages; i++)
1026                 desc->bd_frag_ops->add_kiov_frag(desc, pages[i], 0,
1027                                                  PAGE_SIZE);
1028
1029         mdc_readdir_pack(req, offset, PAGE_SIZE * npages, fid);
1030
1031         ptlrpc_request_set_replen(req);
1032         rc = ptlrpc_queue_wait(req);
1033         if (rc) {
1034                 ptlrpc_req_finished(req);
1035                 if (rc != -ETIMEDOUT)
1036                         RETURN(rc);
1037
1038                 resends++;
1039                 if (!client_should_resend(resends, &exp->exp_obd->u.cli)) {
1040                         CERROR("%s: too many resend retries: rc = %d\n",
1041                                exp->exp_obd->obd_name, -EIO);
1042                         RETURN(-EIO);
1043                 }
1044                 lwi = LWI_TIMEOUT_INTR(cfs_time_seconds(resends), NULL, NULL,
1045                                        NULL);
1046                 l_wait_event(waitq, 0, &lwi);
1047
1048                 goto restart_bulk;
1049         }
1050
1051         rc = sptlrpc_cli_unwrap_bulk_read(req, req->rq_bulk,
1052                                           req->rq_bulk->bd_nob_transferred);
1053         if (rc < 0) {
1054                 ptlrpc_req_finished(req);
1055                 RETURN(rc);
1056         }
1057
1058         if (req->rq_bulk->bd_nob_transferred & ~LU_PAGE_MASK) {
1059                 CERROR("%s: unexpected bytes transferred: %d (%ld expected)\n",
1060                        exp->exp_obd->obd_name, req->rq_bulk->bd_nob_transferred,
1061                        PAGE_SIZE * npages);
1062                 ptlrpc_req_finished(req);
1063                 RETURN(-EPROTO);
1064         }
1065
1066         *request = req;
1067         RETURN(0);
1068 }
1069
1070 static void mdc_release_page(struct page *page, int remove)
1071 {
1072         if (remove) {
1073                 lock_page(page);
1074                 if (likely(page->mapping != NULL))
1075                         truncate_complete_page(page->mapping, page);
1076                 unlock_page(page);
1077         }
1078         put_page(page);
1079 }
1080
1081 static struct page *mdc_page_locate(struct address_space *mapping, __u64 *hash,
1082                                     __u64 *start, __u64 *end, int hash64)
1083 {
1084         /*
1085          * Complement of hash is used as an index so that
1086          * radix_tree_gang_lookup() can be used to find a page with starting
1087          * hash _smaller_ than one we are looking for.
1088          */
1089         unsigned long offset = hash_x_index(*hash, hash64);
1090         struct page *page;
1091         int found;
1092
1093         spin_lock_irq(&mapping->tree_lock);
1094         found = radix_tree_gang_lookup(&mapping->page_tree,
1095                                        (void **)&page, offset, 1);
1096         if (found > 0 && !radix_tree_exceptional_entry(page)) {
1097                 struct lu_dirpage *dp;
1098
1099                 get_page(page);
1100                 spin_unlock_irq(&mapping->tree_lock);
1101                 /*
1102                  * In contrast to find_lock_page() we are sure that directory
1103                  * page cannot be truncated (while DLM lock is held) and,
1104                  * hence, can avoid restart.
1105                  *
1106                  * In fact, page cannot be locked here at all, because
1107                  * mdc_read_page_remote does synchronous io.
1108                  */
1109                 wait_on_page_locked(page);
1110                 if (PageUptodate(page)) {
1111                         dp = kmap(page);
1112                         if (BITS_PER_LONG == 32 && hash64) {
1113                                 *start = le64_to_cpu(dp->ldp_hash_start) >> 32;
1114                                 *end   = le64_to_cpu(dp->ldp_hash_end) >> 32;
1115                                 *hash  = *hash >> 32;
1116                         } else {
1117                                 *start = le64_to_cpu(dp->ldp_hash_start);
1118                                 *end   = le64_to_cpu(dp->ldp_hash_end);
1119                         }
1120                         if (unlikely(*start == 1 && *hash == 0))
1121                                 *hash = *start;
1122                         else
1123                                 LASSERTF(*start <= *hash, "start = %#llx"
1124                                          ",end = %#llx,hash = %#llx\n",
1125                                          *start, *end, *hash);
1126                         CDEBUG(D_VFSTRACE, "offset %lx [%#llx %#llx],"
1127                               " hash %#llx\n", offset, *start, *end, *hash);
1128                         if (*hash > *end) {
1129                                 kunmap(page);
1130                                 mdc_release_page(page, 0);
1131                                 page = NULL;
1132                         } else if (*end != *start && *hash == *end) {
1133                                 /*
1134                                  * upon hash collision, remove this page,
1135                                  * otherwise put page reference, and
1136                                  * mdc_read_page_remote() will issue RPC to
1137                                  * fetch the page we want.
1138                                  */
1139                                 kunmap(page);
1140                                 mdc_release_page(page,
1141                                     le32_to_cpu(dp->ldp_flags) & LDF_COLLIDE);
1142                                 page = NULL;
1143                         }
1144                 } else {
1145                         put_page(page);
1146                         page = ERR_PTR(-EIO);
1147                 }
1148         } else {
1149                 spin_unlock_irq(&mapping->tree_lock);
1150                 page = NULL;
1151         }
1152         return page;
1153 }
1154
1155 /*
1156  * Adjust a set of pages, each page containing an array of lu_dirpages,
1157  * so that each page can be used as a single logical lu_dirpage.
1158  *
1159  * A lu_dirpage is laid out as follows, where s = ldp_hash_start,
1160  * e = ldp_hash_end, f = ldp_flags, p = padding, and each "ent" is a
1161  * struct lu_dirent.  It has size up to LU_PAGE_SIZE. The ldp_hash_end
1162  * value is used as a cookie to request the next lu_dirpage in a
1163  * directory listing that spans multiple pages (two in this example):
1164  *   ________
1165  *  |        |
1166  * .|--------v-------   -----.
1167  * |s|e|f|p|ent|ent| ... |ent|
1168  * '--|--------------   -----'   Each PAGE contains a single
1169  *    '------.                   lu_dirpage.
1170  * .---------v-------   -----.
1171  * |s|e|f|p|ent| 0 | ... | 0 |
1172  * '-----------------   -----'
1173  *
1174  * However, on hosts where the native VM page size (PAGE_SIZE) is
1175  * larger than LU_PAGE_SIZE, a single host page may contain multiple
1176  * lu_dirpages. After reading the lu_dirpages from the MDS, the
1177  * ldp_hash_end of the first lu_dirpage refers to the one immediately
1178  * after it in the same PAGE (arrows simplified for brevity, but
1179  * in general e0==s1, e1==s2, etc.):
1180  *
1181  * .--------------------   -----.
1182  * |s0|e0|f0|p|ent|ent| ... |ent|
1183  * |---v----------------   -----|
1184  * |s1|e1|f1|p|ent|ent| ... |ent|
1185  * |---v----------------   -----|  Here, each PAGE contains
1186  *             ...                 multiple lu_dirpages.
1187  * |---v----------------   -----|
1188  * |s'|e'|f'|p|ent|ent| ... |ent|
1189  * '---|----------------   -----'
1190  *     v
1191  * .----------------------------.
1192  * |        next PAGE           |
1193  *
1194  * This structure is transformed into a single logical lu_dirpage as follows:
1195  *
1196  * - Replace e0 with e' so the request for the next lu_dirpage gets the page
1197  *   labeled 'next PAGE'.
1198  *
1199  * - Copy the LDF_COLLIDE flag from f' to f0 to correctly reflect whether
1200  *   a hash collision with the next page exists.
1201  *
1202  * - Adjust the lde_reclen of the ending entry of each lu_dirpage to span
1203  *   to the first entry of the next lu_dirpage.
1204  */
1205 #if PAGE_SIZE > LU_PAGE_SIZE
1206 static void mdc_adjust_dirpages(struct page **pages, int cfs_pgs, int lu_pgs)
1207 {
1208         int i;
1209
1210         for (i = 0; i < cfs_pgs; i++) {
1211                 struct lu_dirpage       *dp = kmap(pages[i]);
1212                 struct lu_dirpage       *first = dp;
1213                 struct lu_dirent        *end_dirent = NULL;
1214                 struct lu_dirent        *ent;
1215                 __u64           hash_end = le64_to_cpu(dp->ldp_hash_end);
1216                 __u32           flags = le32_to_cpu(dp->ldp_flags);
1217
1218                 while (--lu_pgs > 0) {
1219                         ent = lu_dirent_start(dp);
1220                         for (end_dirent = ent; ent != NULL;
1221                              end_dirent = ent, ent = lu_dirent_next(ent));
1222
1223                         /* Advance dp to next lu_dirpage. */
1224                         dp = (struct lu_dirpage *)((char *)dp + LU_PAGE_SIZE);
1225
1226                         /* Check if we've reached the end of the PAGE. */
1227                         if (!((unsigned long)dp & ~PAGE_MASK))
1228                                 break;
1229
1230                         /* Save the hash and flags of this lu_dirpage. */
1231                         hash_end = le64_to_cpu(dp->ldp_hash_end);
1232                         flags = le32_to_cpu(dp->ldp_flags);
1233
1234                         /* Check if lu_dirpage contains no entries. */
1235                         if (end_dirent == NULL)
1236                                 break;
1237
1238                         /* Enlarge the end entry lde_reclen from 0 to
1239                          * first entry of next lu_dirpage. */
1240                         LASSERT(le16_to_cpu(end_dirent->lde_reclen) == 0);
1241                         end_dirent->lde_reclen =
1242                                 cpu_to_le16((char *)(dp->ldp_entries) -
1243                                             (char *)end_dirent);
1244                 }
1245
1246                 first->ldp_hash_end = hash_end;
1247                 first->ldp_flags &= ~cpu_to_le32(LDF_COLLIDE);
1248                 first->ldp_flags |= flags & cpu_to_le32(LDF_COLLIDE);
1249
1250                 kunmap(pages[i]);
1251         }
1252         LASSERTF(lu_pgs == 0, "left = %d\n", lu_pgs);
1253 }
1254 #else
1255 #define mdc_adjust_dirpages(pages, cfs_pgs, lu_pgs) do {} while (0)
1256 #endif  /* PAGE_SIZE > LU_PAGE_SIZE */
1257
1258 /* parameters for readdir page */
1259 struct readpage_param {
1260         struct md_op_data       *rp_mod;
1261         __u64                   rp_off;
1262         int                     rp_hash64;
1263         struct obd_export       *rp_exp;
1264         struct md_callback      *rp_cb;
1265 };
1266
1267 #ifndef HAVE_DELETE_FROM_PAGE_CACHE
1268 static inline void delete_from_page_cache(struct page *page)
1269 {
1270         remove_from_page_cache(page);
1271         put_page(page);
1272 }
1273 #endif
1274
1275 /**
1276  * Read pages from server.
1277  *
1278  * Page in MDS_READPAGE RPC is packed in LU_PAGE_SIZE, and each page contains
1279  * a header lu_dirpage which describes the start/end hash, and whether this
1280  * page is empty (contains no dir entry) or hash collide with next page.
1281  * After client receives reply, several pages will be integrated into dir page
1282  * in PAGE_SIZE (if PAGE_SIZE greater than LU_PAGE_SIZE), and the
1283  * lu_dirpage for this integrated page will be adjusted.
1284  **/
1285 static int mdc_read_page_remote(void *data, struct page *page0)
1286 {
1287         struct readpage_param *rp = data;
1288         struct page **page_pool;
1289         struct page *page;
1290         struct lu_dirpage *dp;
1291         struct md_op_data *op_data = rp->rp_mod;
1292         struct ptlrpc_request *req;
1293         int max_pages;
1294         struct inode *inode;
1295         struct lu_fid *fid;
1296         int rd_pgs = 0; /* number of pages actually read */
1297         int npages;
1298         int i;
1299         int rc;
1300         ENTRY;
1301
1302         max_pages = rp->rp_exp->exp_obd->u.cli.cl_max_pages_per_rpc;
1303         inode = op_data->op_data;
1304         fid = &op_data->op_fid1;
1305         LASSERT(inode != NULL);
1306
1307         OBD_ALLOC(page_pool, sizeof(page_pool[0]) * max_pages);
1308         if (page_pool != NULL) {
1309                 page_pool[0] = page0;
1310         } else {
1311                 page_pool = &page0;
1312                 max_pages = 1;
1313         }
1314
1315         for (npages = 1; npages < max_pages; npages++) {
1316                 page = __page_cache_alloc(mapping_gfp_mask(inode->i_mapping)
1317                                           | __GFP_COLD);
1318                 if (page == NULL)
1319                         break;
1320                 page_pool[npages] = page;
1321         }
1322
1323         rc = mdc_getpage(rp->rp_exp, fid, rp->rp_off, page_pool, npages, &req);
1324         if (rc < 0) {
1325                 /* page0 is special, which was added into page cache early */
1326                 delete_from_page_cache(page0);
1327         } else {
1328                 int lu_pgs;
1329
1330                 rd_pgs = (req->rq_bulk->bd_nob_transferred + PAGE_SIZE - 1) >>
1331                         PAGE_SHIFT;
1332                 lu_pgs = req->rq_bulk->bd_nob_transferred >> LU_PAGE_SHIFT;
1333                 LASSERT(!(req->rq_bulk->bd_nob_transferred & ~LU_PAGE_MASK));
1334
1335                 CDEBUG(D_INODE, "read %d(%d) pages\n", rd_pgs, lu_pgs);
1336
1337                 mdc_adjust_dirpages(page_pool, rd_pgs, lu_pgs);
1338
1339                 SetPageUptodate(page0);
1340         }
1341         unlock_page(page0);
1342
1343         ptlrpc_req_finished(req);
1344         CDEBUG(D_CACHE, "read %d/%d pages\n", rd_pgs, npages);
1345         for (i = 1; i < npages; i++) {
1346                 unsigned long   offset;
1347                 __u64           hash;
1348                 int ret;
1349
1350                 page = page_pool[i];
1351
1352                 if (rc < 0 || i >= rd_pgs) {
1353                         put_page(page);
1354                         continue;
1355                 }
1356
1357                 SetPageUptodate(page);
1358
1359                 dp = kmap(page);
1360                 hash = le64_to_cpu(dp->ldp_hash_start);
1361                 kunmap(page);
1362
1363                 offset = hash_x_index(hash, rp->rp_hash64);
1364
1365                 prefetchw(&page->flags);
1366                 ret = add_to_page_cache_lru(page, inode->i_mapping, offset,
1367                                             GFP_KERNEL);
1368                 if (ret == 0)
1369                         unlock_page(page);
1370                 else
1371                         CDEBUG(D_VFSTRACE, "page %lu add to page cache failed:"
1372                                " rc = %d\n", offset, ret);
1373                 put_page(page);
1374         }
1375
1376         if (page_pool != &page0)
1377                 OBD_FREE(page_pool, sizeof(page_pool[0]) * max_pages);
1378
1379         RETURN(rc);
1380 }
1381
1382 /**
1383  * Read dir page from cache first, if it can not find it, read it from
1384  * server and add into the cache.
1385  *
1386  * \param[in] exp       MDC export
1387  * \param[in] op_data   client MD stack parameters, transfering parameters
1388  *                      between different layers on client MD stack.
1389  * \param[in] cb_op     callback required for ldlm lock enqueue during
1390  *                      read page
1391  * \param[in] hash_offset the hash offset of the page to be read
1392  * \param[in] ppage     the page to be read
1393  *
1394  * retval               = 0 get the page successfully
1395  *                      errno(<0) get the page failed
1396  */
1397 static int mdc_read_page(struct obd_export *exp, struct md_op_data *op_data,
1398                          struct md_callback *cb_op, __u64 hash_offset,
1399                          struct page **ppage)
1400 {
1401         struct lookup_intent    it = { .it_op = IT_READDIR };
1402         struct page             *page;
1403         struct inode            *dir = op_data->op_data;
1404         struct address_space    *mapping;
1405         struct lu_dirpage       *dp;
1406         __u64                   start = 0;
1407         __u64                   end = 0;
1408         struct lustre_handle    lockh;
1409         struct ptlrpc_request   *enq_req = NULL;
1410         struct readpage_param   rp_param;
1411         int rc;
1412
1413         ENTRY;
1414
1415         *ppage = NULL;
1416
1417         LASSERT(dir != NULL);
1418         mapping = dir->i_mapping;
1419
1420         rc = mdc_intent_lock(exp, op_data, &it, &enq_req,
1421                              cb_op->md_blocking_ast, 0);
1422         if (enq_req != NULL)
1423                 ptlrpc_req_finished(enq_req);
1424
1425         if (rc < 0) {
1426                 CERROR("%s: "DFID" lock enqueue fails: rc = %d\n",
1427                        exp->exp_obd->obd_name, PFID(&op_data->op_fid1), rc);
1428                 RETURN(rc);
1429         }
1430
1431         rc = 0;
1432         lockh.cookie = it.it_lock_handle;
1433         mdc_set_lock_data(exp, &lockh, dir, NULL);
1434
1435         rp_param.rp_off = hash_offset;
1436         rp_param.rp_hash64 = op_data->op_cli_flags & CLI_HASH64;
1437         page = mdc_page_locate(mapping, &rp_param.rp_off, &start, &end,
1438                                rp_param.rp_hash64);
1439         if (IS_ERR(page)) {
1440                 CERROR("%s: dir page locate: "DFID" at %llu: rc %ld\n",
1441                        exp->exp_obd->obd_name, PFID(&op_data->op_fid1),
1442                        rp_param.rp_off, PTR_ERR(page));
1443                 GOTO(out_unlock, rc = PTR_ERR(page));
1444         } else if (page != NULL) {
1445                 /*
1446                  * XXX nikita: not entirely correct handling of a corner case:
1447                  * suppose hash chain of entries with hash value HASH crosses
1448                  * border between pages P0 and P1. First both P0 and P1 are
1449                  * cached, seekdir() is called for some entry from the P0 part
1450                  * of the chain. Later P0 goes out of cache. telldir(HASH)
1451                  * happens and finds P1, as it starts with matching hash
1452                  * value. Remaining entries from P0 part of the chain are
1453                  * skipped. (Is that really a bug?)
1454                  *
1455                  * Possible solutions: 0. don't cache P1 is such case, handle
1456                  * it as an "overflow" page. 1. invalidate all pages at
1457                  * once. 2. use HASH|1 as an index for P1.
1458                  */
1459                 GOTO(hash_collision, page);
1460         }
1461
1462         rp_param.rp_exp = exp;
1463         rp_param.rp_mod = op_data;
1464         page = read_cache_page(mapping,
1465                                hash_x_index(rp_param.rp_off,
1466                                             rp_param.rp_hash64),
1467                                mdc_read_page_remote, &rp_param);
1468         if (IS_ERR(page)) {
1469                 CDEBUG(D_INFO, "%s: read cache page: "DFID" at %llu: %ld\n",
1470                        exp->exp_obd->obd_name, PFID(&op_data->op_fid1),
1471                        rp_param.rp_off, PTR_ERR(page));
1472                 GOTO(out_unlock, rc = PTR_ERR(page));
1473         }
1474
1475         wait_on_page_locked(page);
1476         (void)kmap(page);
1477         if (!PageUptodate(page)) {
1478                 CERROR("%s: page not updated: "DFID" at %llu: rc %d\n",
1479                        exp->exp_obd->obd_name, PFID(&op_data->op_fid1),
1480                        rp_param.rp_off, -5);
1481                 goto fail;
1482         }
1483         if (!PageChecked(page))
1484                 SetPageChecked(page);
1485         if (PageError(page)) {
1486                 CERROR("%s: page error: "DFID" at %llu: rc %d\n",
1487                        exp->exp_obd->obd_name, PFID(&op_data->op_fid1),
1488                        rp_param.rp_off, -5);
1489                 goto fail;
1490         }
1491
1492 hash_collision:
1493         dp = page_address(page);
1494         if (BITS_PER_LONG == 32 && rp_param.rp_hash64) {
1495                 start = le64_to_cpu(dp->ldp_hash_start) >> 32;
1496                 end   = le64_to_cpu(dp->ldp_hash_end) >> 32;
1497                 rp_param.rp_off = hash_offset >> 32;
1498         } else {
1499                 start = le64_to_cpu(dp->ldp_hash_start);
1500                 end   = le64_to_cpu(dp->ldp_hash_end);
1501                 rp_param.rp_off = hash_offset;
1502         }
1503         if (end == start) {
1504                 LASSERT(start == rp_param.rp_off);
1505                 CWARN("Page-wide hash collision: %#lx\n", (unsigned long)end);
1506 #if BITS_PER_LONG == 32
1507                 CWARN("Real page-wide hash collision at [%llu %llu] with "
1508                       "hash %llu\n", le64_to_cpu(dp->ldp_hash_start),
1509                       le64_to_cpu(dp->ldp_hash_end), hash_offset);
1510 #endif
1511
1512                 /*
1513                  * Fetch whole overflow chain...
1514                  *
1515                  * XXX not yet.
1516                  */
1517                 goto fail;
1518         }
1519         *ppage = page;
1520 out_unlock:
1521         ldlm_lock_decref(&lockh, it.it_lock_mode);
1522         return rc;
1523 fail:
1524         kunmap(page);
1525         mdc_release_page(page, 1);
1526         rc = -EIO;
1527         goto out_unlock;
1528 }
1529
1530 static int mdc_statfs(const struct lu_env *env,
1531                       struct obd_export *exp, struct obd_statfs *osfs,
1532                       time64_t max_age, __u32 flags)
1533 {
1534         struct obd_device *obd = class_exp2obd(exp);
1535         struct req_format *fmt;
1536         struct ptlrpc_request *req;
1537         struct obd_statfs *msfs;
1538         struct obd_import *imp = NULL;
1539         int rc;
1540         ENTRY;
1541
1542         /*
1543          * Since the request might also come from lprocfs, so we need
1544          * sync this with client_disconnect_export Bug15684
1545          */
1546         down_read(&obd->u.cli.cl_sem);
1547         if (obd->u.cli.cl_import)
1548                 imp = class_import_get(obd->u.cli.cl_import);
1549         up_read(&obd->u.cli.cl_sem);
1550         if (!imp)
1551                 RETURN(-ENODEV);
1552
1553         fmt = &RQF_MDS_STATFS;
1554         if ((exp_connect_flags2(exp) & OBD_CONNECT2_SUM_STATFS) &&
1555             (flags & OBD_STATFS_SUM))
1556                 fmt = &RQF_MDS_STATFS_NEW;
1557         req = ptlrpc_request_alloc_pack(imp, fmt, LUSTRE_MDS_VERSION,
1558                                         MDS_STATFS);
1559         if (req == NULL)
1560                 GOTO(output, rc = -ENOMEM);
1561
1562         if ((flags & OBD_STATFS_SUM) &&
1563             (exp_connect_flags2(exp) & OBD_CONNECT2_SUM_STATFS)) {
1564                 /* request aggregated states */
1565                 struct mdt_body *body;
1566
1567                 body = req_capsule_client_get(&req->rq_pill, &RMF_MDT_BODY);
1568                 if (body == NULL)
1569                         GOTO(out, rc = -EPROTO);
1570                 body->mbo_valid = OBD_MD_FLAGSTATFS;
1571         }
1572
1573         ptlrpc_request_set_replen(req);
1574
1575         if (flags & OBD_STATFS_NODELAY) {
1576                 /* procfs requests not want stay in wait for avoid deadlock */
1577                 req->rq_no_resend = 1;
1578                 req->rq_no_delay = 1;
1579         }
1580
1581         rc = ptlrpc_queue_wait(req);
1582         if (rc) {
1583                 /* check connection error first */
1584                 if (imp->imp_connect_error)
1585                         rc = imp->imp_connect_error;
1586                 GOTO(out, rc);
1587         }
1588
1589         msfs = req_capsule_server_get(&req->rq_pill, &RMF_OBD_STATFS);
1590         if (msfs == NULL)
1591                 GOTO(out, rc = -EPROTO);
1592
1593         *osfs = *msfs;
1594         EXIT;
1595 out:
1596         ptlrpc_req_finished(req);
1597 output:
1598         class_import_put(imp);
1599         return rc;
1600 }
1601
1602 static int mdc_ioc_fid2path(struct obd_export *exp, struct getinfo_fid2path *gf)
1603 {
1604         __u32 keylen, vallen;
1605         void *key;
1606         int rc;
1607
1608         if (gf->gf_pathlen > PATH_MAX)
1609                 RETURN(-ENAMETOOLONG);
1610         if (gf->gf_pathlen < 2)
1611                 RETURN(-EOVERFLOW);
1612
1613         /* Key is KEY_FID2PATH + getinfo_fid2path description */
1614         keylen = cfs_size_round(sizeof(KEY_FID2PATH) + sizeof(*gf) +
1615                                 sizeof(struct lu_fid));
1616         OBD_ALLOC(key, keylen);
1617         if (key == NULL)
1618                 RETURN(-ENOMEM);
1619         memcpy(key, KEY_FID2PATH, sizeof(KEY_FID2PATH));
1620         memcpy(key + cfs_size_round(sizeof(KEY_FID2PATH)), gf, sizeof(*gf));
1621         memcpy(key + cfs_size_round(sizeof(KEY_FID2PATH)) + sizeof(*gf),
1622                gf->gf_u.gf_root_fid, sizeof(struct lu_fid));
1623         CDEBUG(D_IOCTL, "path get "DFID" from %llu #%d\n",
1624                PFID(&gf->gf_fid), gf->gf_recno, gf->gf_linkno);
1625
1626         if (!fid_is_sane(&gf->gf_fid))
1627                 GOTO(out, rc = -EINVAL);
1628
1629         /* Val is struct getinfo_fid2path result plus path */
1630         vallen = sizeof(*gf) + gf->gf_pathlen;
1631
1632         rc = obd_get_info(NULL, exp, keylen, key, &vallen, gf);
1633         if (rc != 0 && rc != -EREMOTE)
1634                 GOTO(out, rc);
1635
1636         if (vallen <= sizeof(*gf))
1637                 GOTO(out, rc = -EPROTO);
1638         if (vallen > sizeof(*gf) + gf->gf_pathlen)
1639                 GOTO(out, rc = -EOVERFLOW);
1640
1641         CDEBUG(D_IOCTL, "path got "DFID" from %llu #%d: %s\n",
1642                PFID(&gf->gf_fid), gf->gf_recno, gf->gf_linkno,
1643                gf->gf_pathlen < 512 ? gf->gf_u.gf_path :
1644                /* only log the last 512 characters of the path */
1645                gf->gf_u.gf_path + gf->gf_pathlen - 512);
1646
1647 out:
1648         OBD_FREE(key, keylen);
1649         return rc;
1650 }
1651
1652 static int mdc_ioc_hsm_progress(struct obd_export *exp,
1653                                 struct hsm_progress_kernel *hpk)
1654 {
1655         struct obd_import               *imp = class_exp2cliimp(exp);
1656         struct hsm_progress_kernel      *req_hpk;
1657         struct ptlrpc_request           *req;
1658         int                              rc;
1659         ENTRY;
1660
1661         req = ptlrpc_request_alloc_pack(imp, &RQF_MDS_HSM_PROGRESS,
1662                                         LUSTRE_MDS_VERSION, MDS_HSM_PROGRESS);
1663         if (req == NULL)
1664                 GOTO(out, rc = -ENOMEM);
1665
1666         mdc_pack_body(req, NULL, 0, 0, -1, 0);
1667
1668         /* Copy hsm_progress struct */
1669         req_hpk = req_capsule_client_get(&req->rq_pill, &RMF_MDS_HSM_PROGRESS);
1670         if (req_hpk == NULL)
1671                 GOTO(out, rc = -EPROTO);
1672
1673         *req_hpk = *hpk;
1674         req_hpk->hpk_errval = lustre_errno_hton(hpk->hpk_errval);
1675
1676         ptlrpc_request_set_replen(req);
1677
1678         mdc_get_mod_rpc_slot(req, NULL);
1679         rc = ptlrpc_queue_wait(req);
1680         mdc_put_mod_rpc_slot(req, NULL);
1681
1682         GOTO(out, rc);
1683 out:
1684         ptlrpc_req_finished(req);
1685         return rc;
1686 }
1687 /**
1688  * Send hsm_ct_register to MDS
1689  *
1690  * \param[in]   imp             import
1691  * \param[in]   archive_count   if in bitmap format, it is the bitmap,
1692  *                              else it is the count of archive_ids
1693  * \param[in]   archives        if in bitmap format, it is NULL,
1694  *                              else it is archive_id lists
1695  */
1696 static int mdc_ioc_hsm_ct_register(struct obd_import *imp, __u32 archive_count,
1697                                    __u32 *archives)
1698 {
1699         struct ptlrpc_request *req;
1700         __u32 *archive_array;
1701         size_t archives_size;
1702         int rc;
1703         ENTRY;
1704
1705         req = ptlrpc_request_alloc(imp, &RQF_MDS_HSM_CT_REGISTER);
1706         if (req == NULL)
1707                 RETURN(-ENOMEM);
1708
1709         if (archives != NULL)
1710                 archives_size = sizeof(*archive_array) * archive_count;
1711         else
1712                 archives_size = sizeof(archive_count);
1713
1714         req_capsule_set_size(&req->rq_pill, &RMF_MDS_HSM_ARCHIVE,
1715                              RCL_CLIENT, archives_size);
1716
1717         rc = ptlrpc_request_pack(req, LUSTRE_MDS_VERSION, MDS_HSM_CT_REGISTER);
1718         if (rc) {
1719                 ptlrpc_request_free(req);
1720                 RETURN(-ENOMEM);
1721         }
1722
1723         mdc_pack_body(req, NULL, 0, 0, -1, 0);
1724
1725         archive_array = req_capsule_client_get(&req->rq_pill,
1726                                                &RMF_MDS_HSM_ARCHIVE);
1727         if (archive_array == NULL)
1728                 GOTO(out, rc = -EPROTO);
1729
1730         if (archives != NULL)
1731                 memcpy(archive_array, archives, archives_size);
1732         else
1733                 *archive_array = archive_count;
1734
1735         ptlrpc_request_set_replen(req);
1736
1737         rc = mdc_queue_wait(req);
1738         GOTO(out, rc);
1739 out:
1740         ptlrpc_req_finished(req);
1741         return rc;
1742 }
1743
1744 static int mdc_ioc_hsm_current_action(struct obd_export *exp,
1745                                       struct md_op_data *op_data)
1746 {
1747         struct hsm_current_action       *hca = op_data->op_data;
1748         struct hsm_current_action       *req_hca;
1749         struct ptlrpc_request           *req;
1750         int                              rc;
1751         ENTRY;
1752
1753         req = ptlrpc_request_alloc(class_exp2cliimp(exp),
1754                                    &RQF_MDS_HSM_ACTION);
1755         if (req == NULL)
1756                 RETURN(-ENOMEM);
1757
1758         rc = ptlrpc_request_pack(req, LUSTRE_MDS_VERSION, MDS_HSM_ACTION);
1759         if (rc) {
1760                 ptlrpc_request_free(req);
1761                 RETURN(rc);
1762         }
1763
1764         mdc_pack_body(req, &op_data->op_fid1, 0, 0,
1765                       op_data->op_suppgids[0], 0);
1766
1767         ptlrpc_request_set_replen(req);
1768
1769         rc = mdc_queue_wait(req);
1770         if (rc)
1771                 GOTO(out, rc);
1772
1773         req_hca = req_capsule_server_get(&req->rq_pill,
1774                                          &RMF_MDS_HSM_CURRENT_ACTION);
1775         if (req_hca == NULL)
1776                 GOTO(out, rc = -EPROTO);
1777
1778         *hca = *req_hca;
1779
1780         EXIT;
1781 out:
1782         ptlrpc_req_finished(req);
1783         return rc;
1784 }
1785
1786 static int mdc_ioc_hsm_ct_unregister(struct obd_import *imp)
1787 {
1788         struct ptlrpc_request   *req;
1789         int                      rc;
1790         ENTRY;
1791
1792         req = ptlrpc_request_alloc_pack(imp, &RQF_MDS_HSM_CT_UNREGISTER,
1793                                         LUSTRE_MDS_VERSION,
1794                                         MDS_HSM_CT_UNREGISTER);
1795         if (req == NULL)
1796                 GOTO(out, rc = -ENOMEM);
1797
1798         mdc_pack_body(req, NULL, 0, 0, -1, 0);
1799
1800         ptlrpc_request_set_replen(req);
1801
1802         rc = mdc_queue_wait(req);
1803         GOTO(out, rc);
1804 out:
1805         ptlrpc_req_finished(req);
1806         return rc;
1807 }
1808
1809 static int mdc_ioc_hsm_state_get(struct obd_export *exp,
1810                                  struct md_op_data *op_data)
1811 {
1812         struct hsm_user_state   *hus = op_data->op_data;
1813         struct hsm_user_state   *req_hus;
1814         struct ptlrpc_request   *req;
1815         int                      rc;
1816         ENTRY;
1817
1818         req = ptlrpc_request_alloc(class_exp2cliimp(exp),
1819                                    &RQF_MDS_HSM_STATE_GET);
1820         if (req == NULL)
1821                 RETURN(-ENOMEM);
1822
1823         rc = ptlrpc_request_pack(req, LUSTRE_MDS_VERSION, MDS_HSM_STATE_GET);
1824         if (rc != 0) {
1825                 ptlrpc_request_free(req);
1826                 RETURN(rc);
1827         }
1828
1829         mdc_pack_body(req, &op_data->op_fid1, 0, 0,
1830                       op_data->op_suppgids[0], 0);
1831
1832         ptlrpc_request_set_replen(req);
1833
1834         rc = mdc_queue_wait(req);
1835         if (rc)
1836                 GOTO(out, rc);
1837
1838         req_hus = req_capsule_server_get(&req->rq_pill, &RMF_HSM_USER_STATE);
1839         if (req_hus == NULL)
1840                 GOTO(out, rc = -EPROTO);
1841
1842         *hus = *req_hus;
1843
1844         EXIT;
1845 out:
1846         ptlrpc_req_finished(req);
1847         return rc;
1848 }
1849
1850 static int mdc_ioc_hsm_state_set(struct obd_export *exp,
1851                                  struct md_op_data *op_data)
1852 {
1853         struct hsm_state_set    *hss = op_data->op_data;
1854         struct hsm_state_set    *req_hss;
1855         struct ptlrpc_request   *req;
1856         int                      rc;
1857         ENTRY;
1858
1859         req = ptlrpc_request_alloc(class_exp2cliimp(exp),
1860                                    &RQF_MDS_HSM_STATE_SET);
1861         if (req == NULL)
1862                 RETURN(-ENOMEM);
1863
1864         rc = ptlrpc_request_pack(req, LUSTRE_MDS_VERSION, MDS_HSM_STATE_SET);
1865         if (rc) {
1866                 ptlrpc_request_free(req);
1867                 RETURN(rc);
1868         }
1869
1870         mdc_pack_body(req, &op_data->op_fid1, 0, 0,
1871                       op_data->op_suppgids[0], 0);
1872
1873         /* Copy states */
1874         req_hss = req_capsule_client_get(&req->rq_pill, &RMF_HSM_STATE_SET);
1875         if (req_hss == NULL)
1876                 GOTO(out, rc = -EPROTO);
1877         *req_hss = *hss;
1878
1879         ptlrpc_request_set_replen(req);
1880
1881         mdc_get_mod_rpc_slot(req, NULL);
1882         rc = ptlrpc_queue_wait(req);
1883         mdc_put_mod_rpc_slot(req, NULL);
1884
1885         GOTO(out, rc);
1886 out:
1887         ptlrpc_req_finished(req);
1888         return rc;
1889 }
1890
1891 static int mdc_ioc_hsm_request(struct obd_export *exp,
1892                                struct hsm_user_request *hur)
1893 {
1894         struct obd_import       *imp = class_exp2cliimp(exp);
1895         struct ptlrpc_request   *req;
1896         struct hsm_request      *req_hr;
1897         struct hsm_user_item    *req_hui;
1898         char                    *req_opaque;
1899         int                      rc;
1900         ENTRY;
1901
1902         req = ptlrpc_request_alloc(imp, &RQF_MDS_HSM_REQUEST);
1903         if (req == NULL)
1904                 GOTO(out, rc = -ENOMEM);
1905
1906         req_capsule_set_size(&req->rq_pill, &RMF_MDS_HSM_USER_ITEM, RCL_CLIENT,
1907                              hur->hur_request.hr_itemcount
1908                              * sizeof(struct hsm_user_item));
1909         req_capsule_set_size(&req->rq_pill, &RMF_GENERIC_DATA, RCL_CLIENT,
1910                              hur->hur_request.hr_data_len);
1911
1912         rc = ptlrpc_request_pack(req, LUSTRE_MDS_VERSION, MDS_HSM_REQUEST);
1913         if (rc) {
1914                 ptlrpc_request_free(req);
1915                 RETURN(rc);
1916         }
1917
1918         mdc_pack_body(req, NULL, 0, 0, -1, 0);
1919
1920         /* Copy hsm_request struct */
1921         req_hr = req_capsule_client_get(&req->rq_pill, &RMF_MDS_HSM_REQUEST);
1922         if (req_hr == NULL)
1923                 GOTO(out, rc = -EPROTO);
1924         *req_hr = hur->hur_request;
1925
1926         /* Copy hsm_user_item structs */
1927         req_hui = req_capsule_client_get(&req->rq_pill, &RMF_MDS_HSM_USER_ITEM);
1928         if (req_hui == NULL)
1929                 GOTO(out, rc = -EPROTO);
1930         memcpy(req_hui, hur->hur_user_item,
1931                hur->hur_request.hr_itemcount * sizeof(struct hsm_user_item));
1932
1933         /* Copy opaque field */
1934         req_opaque = req_capsule_client_get(&req->rq_pill, &RMF_GENERIC_DATA);
1935         if (req_opaque == NULL)
1936                 GOTO(out, rc = -EPROTO);
1937         memcpy(req_opaque, hur_data(hur), hur->hur_request.hr_data_len);
1938
1939         ptlrpc_request_set_replen(req);
1940
1941         mdc_get_mod_rpc_slot(req, NULL);
1942         rc = ptlrpc_queue_wait(req);
1943         mdc_put_mod_rpc_slot(req, NULL);
1944
1945         GOTO(out, rc);
1946
1947 out:
1948         ptlrpc_req_finished(req);
1949         return rc;
1950 }
1951
1952 static int mdc_ioc_hsm_ct_start(struct obd_export *exp,
1953                                 struct lustre_kernelcomm *lk);
1954
1955 static int mdc_quotactl(struct obd_device *unused, struct obd_export *exp,
1956                         struct obd_quotactl *oqctl)
1957 {
1958         struct ptlrpc_request   *req;
1959         struct obd_quotactl     *oqc;
1960         int                      rc;
1961         ENTRY;
1962
1963         req = ptlrpc_request_alloc_pack(class_exp2cliimp(exp),
1964                                         &RQF_MDS_QUOTACTL, LUSTRE_MDS_VERSION,
1965                                         MDS_QUOTACTL);
1966         if (req == NULL)
1967                 RETURN(-ENOMEM);
1968
1969         oqc = req_capsule_client_get(&req->rq_pill, &RMF_OBD_QUOTACTL);
1970         *oqc = *oqctl;
1971
1972         ptlrpc_request_set_replen(req);
1973         ptlrpc_at_set_req_timeout(req);
1974
1975         rc = ptlrpc_queue_wait(req);
1976         if (rc)
1977                 CERROR("ptlrpc_queue_wait failed, rc: %d\n", rc);
1978
1979         if (req->rq_repmsg &&
1980             (oqc = req_capsule_server_get(&req->rq_pill, &RMF_OBD_QUOTACTL))) {
1981                 *oqctl = *oqc;
1982         } else if (!rc) {
1983                 CERROR ("Can't unpack obd_quotactl\n");
1984                 rc = -EPROTO;
1985         }
1986         ptlrpc_req_finished(req);
1987
1988         RETURN(rc);
1989 }
1990
1991 static int mdc_ioc_swap_layouts(struct obd_export *exp,
1992                                 struct md_op_data *op_data)
1993 {
1994         struct list_head cancels = LIST_HEAD_INIT(cancels);
1995         struct ptlrpc_request   *req;
1996         int                      rc, count;
1997         struct mdc_swap_layouts *msl, *payload;
1998         ENTRY;
1999
2000         msl = op_data->op_data;
2001
2002         /* When the MDT will get the MDS_SWAP_LAYOUTS RPC the
2003          * first thing it will do is to cancel the 2 layout
2004          * locks held by this client.
2005          * So the client must cancel its layout locks on the 2 fids
2006          * with the request RPC to avoid extra RPC round trips.
2007          */
2008         count = mdc_resource_get_unused(exp, &op_data->op_fid1, &cancels,
2009                                         LCK_EX, MDS_INODELOCK_LAYOUT |
2010                                         MDS_INODELOCK_XATTR);
2011         count += mdc_resource_get_unused(exp, &op_data->op_fid2, &cancels,
2012                                          LCK_EX, MDS_INODELOCK_LAYOUT |
2013                                          MDS_INODELOCK_XATTR);
2014
2015         req = ptlrpc_request_alloc(class_exp2cliimp(exp),
2016                                    &RQF_MDS_SWAP_LAYOUTS);
2017         if (req == NULL) {
2018                 ldlm_lock_list_put(&cancels, l_bl_ast, count);
2019                 RETURN(-ENOMEM);
2020         }
2021
2022         rc = mdc_prep_elc_req(exp, req, MDS_SWAP_LAYOUTS, &cancels, count);
2023         if (rc) {
2024                 ptlrpc_request_free(req);
2025                 RETURN(rc);
2026         }
2027
2028         mdc_swap_layouts_pack(req, op_data);
2029
2030         payload = req_capsule_client_get(&req->rq_pill, &RMF_SWAP_LAYOUTS);
2031         LASSERT(payload);
2032
2033         *payload = *msl;
2034
2035         ptlrpc_request_set_replen(req);
2036
2037         rc = ptlrpc_queue_wait(req);
2038         if (rc)
2039                 GOTO(out, rc);
2040         EXIT;
2041
2042 out:
2043         ptlrpc_req_finished(req);
2044         return rc;
2045 }
2046
2047 static int mdc_iocontrol(unsigned int cmd, struct obd_export *exp, int len,
2048                          void *karg, void __user *uarg)
2049 {
2050         struct obd_device *obd = exp->exp_obd;
2051         struct obd_ioctl_data *data = karg;
2052         struct obd_import *imp = obd->u.cli.cl_import;
2053         int rc;
2054         ENTRY;
2055
2056         if (!try_module_get(THIS_MODULE)) {
2057                 CERROR("%s: cannot get module '%s'\n", obd->obd_name,
2058                        module_name(THIS_MODULE));
2059                 return -EINVAL;
2060         }
2061         switch (cmd) {
2062         case OBD_IOC_FID2PATH:
2063                 rc = mdc_ioc_fid2path(exp, karg);
2064                 GOTO(out, rc);
2065         case LL_IOC_HSM_CT_START:
2066                 rc = mdc_ioc_hsm_ct_start(exp, karg);
2067                 /* ignore if it was already registered on this MDS. */
2068                 if (rc == -EEXIST)
2069                         rc = 0;
2070                 GOTO(out, rc);
2071         case LL_IOC_HSM_PROGRESS:
2072                 rc = mdc_ioc_hsm_progress(exp, karg);
2073                 GOTO(out, rc);
2074         case LL_IOC_HSM_STATE_GET:
2075                 rc = mdc_ioc_hsm_state_get(exp, karg);
2076                 GOTO(out, rc);
2077         case LL_IOC_HSM_STATE_SET:
2078                 rc = mdc_ioc_hsm_state_set(exp, karg);
2079                 GOTO(out, rc);
2080         case LL_IOC_HSM_ACTION:
2081                 rc = mdc_ioc_hsm_current_action(exp, karg);
2082                 GOTO(out, rc);
2083         case LL_IOC_HSM_REQUEST:
2084                 rc = mdc_ioc_hsm_request(exp, karg);
2085                 GOTO(out, rc);
2086         case OBD_IOC_CLIENT_RECOVER:
2087                 rc = ptlrpc_recover_import(imp, data->ioc_inlbuf1, 0);
2088                 if (rc < 0)
2089                         GOTO(out, rc);
2090                 GOTO(out, rc = 0);
2091         case IOC_OSC_SET_ACTIVE:
2092                 rc = ptlrpc_set_import_active(imp, data->ioc_offset);
2093                 GOTO(out, rc);
2094         case OBD_IOC_PING_TARGET:
2095                 rc = ptlrpc_obd_ping(obd);
2096                 GOTO(out, rc);
2097         /*
2098          * Normally IOC_OBD_STATFS, OBD_IOC_QUOTACTL iocontrol are handled by
2099          * LMV instead of MDC. But when the cluster is upgraded from 1.8,
2100          * there'd be no LMV layer thus we might be called here. Eventually
2101          * this code should be removed.
2102          * bz20731, LU-592.
2103          */
2104         case IOC_OBD_STATFS: {
2105                 struct obd_statfs stat_buf = {0};
2106
2107                 if (*((__u32 *) data->ioc_inlbuf2) != 0)
2108                         GOTO(out, rc = -ENODEV);
2109
2110                 /* copy UUID */
2111                 if (copy_to_user(data->ioc_pbuf2, obd2cli_tgt(obd),
2112                                  min((int)data->ioc_plen2,
2113                                      (int)sizeof(struct obd_uuid))))
2114                         GOTO(out, rc = -EFAULT);
2115
2116                 rc = mdc_statfs(NULL, obd->obd_self_export, &stat_buf,
2117                                 ktime_get_seconds() - OBD_STATFS_CACHE_SECONDS,
2118                                 0);
2119                 if (rc != 0)
2120                         GOTO(out, rc);
2121
2122                 if (copy_to_user(data->ioc_pbuf1, &stat_buf,
2123                                      min((int) data->ioc_plen1,
2124                                          (int) sizeof(stat_buf))))
2125                         GOTO(out, rc = -EFAULT);
2126
2127                 GOTO(out, rc = 0);
2128         }
2129         case OBD_IOC_QUOTACTL: {
2130                 struct if_quotactl *qctl = karg;
2131                 struct obd_quotactl *oqctl;
2132
2133                 OBD_ALLOC_PTR(oqctl);
2134                 if (oqctl == NULL)
2135                         GOTO(out, rc = -ENOMEM);
2136
2137                 QCTL_COPY(oqctl, qctl);
2138                 rc = obd_quotactl(exp, oqctl);
2139                 if (rc == 0) {
2140                         QCTL_COPY(qctl, oqctl);
2141                         qctl->qc_valid = QC_MDTIDX;
2142                         qctl->obd_uuid = obd->u.cli.cl_target_uuid;
2143                 }
2144
2145                 OBD_FREE_PTR(oqctl);
2146                 GOTO(out, rc);
2147         }
2148         case LL_IOC_GET_CONNECT_FLAGS:
2149                 if (copy_to_user(uarg, exp_connect_flags_ptr(exp),
2150                                  sizeof(*exp_connect_flags_ptr(exp))))
2151                         GOTO(out, rc = -EFAULT);
2152
2153                 GOTO(out, rc = 0);
2154         case LL_IOC_LOV_SWAP_LAYOUTS:
2155                 rc = mdc_ioc_swap_layouts(exp, karg);
2156                 GOTO(out, rc);
2157         default:
2158                 CERROR("unrecognised ioctl: cmd = %#x\n", cmd);
2159                 GOTO(out, rc = -ENOTTY);
2160         }
2161 out:
2162         module_put(THIS_MODULE);
2163
2164         return rc;
2165 }
2166
2167 static int mdc_get_info_rpc(struct obd_export *exp,
2168                             u32 keylen, void *key,
2169                             u32 vallen, void *val)
2170 {
2171         struct obd_import      *imp = class_exp2cliimp(exp);
2172         struct ptlrpc_request  *req;
2173         char                   *tmp;
2174         int                     rc = -EINVAL;
2175         ENTRY;
2176
2177         req = ptlrpc_request_alloc(imp, &RQF_MDS_GET_INFO);
2178         if (req == NULL)
2179                 RETURN(-ENOMEM);
2180
2181         req_capsule_set_size(&req->rq_pill, &RMF_GETINFO_KEY,
2182                              RCL_CLIENT, keylen);
2183         req_capsule_set_size(&req->rq_pill, &RMF_GETINFO_VALLEN,
2184                              RCL_CLIENT, sizeof(vallen));
2185
2186         rc = ptlrpc_request_pack(req, LUSTRE_MDS_VERSION, MDS_GET_INFO);
2187         if (rc) {
2188                 ptlrpc_request_free(req);
2189                 RETURN(rc);
2190         }
2191
2192         tmp = req_capsule_client_get(&req->rq_pill, &RMF_GETINFO_KEY);
2193         memcpy(tmp, key, keylen);
2194         tmp = req_capsule_client_get(&req->rq_pill, &RMF_GETINFO_VALLEN);
2195         memcpy(tmp, &vallen, sizeof(vallen));
2196
2197         req_capsule_set_size(&req->rq_pill, &RMF_GETINFO_VAL,
2198                              RCL_SERVER, vallen);
2199         ptlrpc_request_set_replen(req);
2200
2201         rc = ptlrpc_queue_wait(req);
2202         /* -EREMOTE means the get_info result is partial, and it needs to
2203          * continue on another MDT, see fid2path part in lmv_iocontrol */
2204         if (rc == 0 || rc == -EREMOTE) {
2205                 tmp = req_capsule_server_get(&req->rq_pill, &RMF_GETINFO_VAL);
2206                 memcpy(val, tmp, vallen);
2207                 if (ptlrpc_rep_need_swab(req)) {
2208                         if (KEY_IS(KEY_FID2PATH))
2209                                 lustre_swab_fid2path(val);
2210                 }
2211         }
2212         ptlrpc_req_finished(req);
2213
2214         RETURN(rc);
2215 }
2216
2217 static void lustre_swab_hai(struct hsm_action_item *h)
2218 {
2219         __swab32s(&h->hai_len);
2220         __swab32s(&h->hai_action);
2221         lustre_swab_lu_fid(&h->hai_fid);
2222         lustre_swab_lu_fid(&h->hai_dfid);
2223         __swab64s(&h->hai_cookie);
2224         __swab64s(&h->hai_extent.offset);
2225         __swab64s(&h->hai_extent.length);
2226         __swab64s(&h->hai_gid);
2227 }
2228
2229 static void lustre_swab_hal(struct hsm_action_list *h)
2230 {
2231         struct hsm_action_item  *hai;
2232         __u32                    i;
2233
2234         __swab32s(&h->hal_version);
2235         __swab32s(&h->hal_count);
2236         __swab32s(&h->hal_archive_id);
2237         __swab64s(&h->hal_flags);
2238         hai = hai_first(h);
2239         for (i = 0; i < h->hal_count; i++, hai = hai_next(hai))
2240                 lustre_swab_hai(hai);
2241 }
2242
2243 static void lustre_swab_kuch(struct kuc_hdr *l)
2244 {
2245         __swab16s(&l->kuc_magic);
2246         /* __u8 l->kuc_transport */
2247         __swab16s(&l->kuc_msgtype);
2248         __swab16s(&l->kuc_msglen);
2249 }
2250
2251 static int mdc_ioc_hsm_ct_start(struct obd_export *exp,
2252                                 struct lustre_kernelcomm *lk)
2253 {
2254         struct obd_import *imp = class_exp2cliimp(exp);
2255         int rc = 0;
2256
2257         if (lk->lk_group != KUC_GRP_HSM) {
2258                 CERROR("Bad copytool group %d\n", lk->lk_group);
2259                 return -EINVAL;
2260         }
2261
2262         CDEBUG(D_HSM, "CT start r%d w%d u%d g%d f%#x\n", lk->lk_rfd, lk->lk_wfd,
2263                lk->lk_uid, lk->lk_group, lk->lk_flags);
2264
2265         if (lk->lk_flags & LK_FLG_STOP) {
2266                 /* Unregister with the coordinator */
2267                 rc = mdc_ioc_hsm_ct_unregister(imp);
2268         } else {
2269                 __u32 *archives = NULL;
2270
2271                 if ((lk->lk_flags & LK_FLG_DATANR) && lk->lk_data_count > 0)
2272                         archives = lk->lk_data;
2273
2274                 rc = mdc_ioc_hsm_ct_register(imp, lk->lk_data_count, archives);
2275         }
2276
2277         return rc;
2278 }
2279
2280 /**
2281  * Send a message to any listening copytools
2282  * @param val KUC message (kuc_hdr + hsm_action_list)
2283  * @param len total length of message
2284  */
2285 static int mdc_hsm_copytool_send(const struct obd_uuid *uuid,
2286                                  size_t len, void *val)
2287 {
2288         struct kuc_hdr          *lh = (struct kuc_hdr *)val;
2289         struct hsm_action_list  *hal = (struct hsm_action_list *)(lh + 1);
2290         int                      rc;
2291         ENTRY;
2292
2293         if (len < sizeof(*lh) + sizeof(*hal)) {
2294                 CERROR("Short HSM message %zu < %zu\n", len,
2295                        sizeof(*lh) + sizeof(*hal));
2296                 RETURN(-EPROTO);
2297         }
2298         if (lh->kuc_magic == __swab16(KUC_MAGIC)) {
2299                 lustre_swab_kuch(lh);
2300                 lustre_swab_hal(hal);
2301         } else if (lh->kuc_magic != KUC_MAGIC) {
2302                 CERROR("Bad magic %x!=%x\n", lh->kuc_magic, KUC_MAGIC);
2303                 RETURN(-EPROTO);
2304         }
2305
2306         CDEBUG(D_HSM, " Received message mg=%x t=%d m=%d l=%d actions=%d "
2307                "on %s\n",
2308                lh->kuc_magic, lh->kuc_transport, lh->kuc_msgtype,
2309                lh->kuc_msglen, hal->hal_count, hal->hal_fsname);
2310
2311         /* Broadcast to HSM listeners */
2312         rc = libcfs_kkuc_group_put(uuid, KUC_GRP_HSM, lh);
2313
2314         RETURN(rc);
2315 }
2316
2317 /**
2318  * callback function passed to kuc for re-registering each HSM copytool
2319  * running on MDC, after MDT shutdown/recovery.
2320  * @param data copytool registration data
2321  * @param cb_arg callback argument (obd_import)
2322  */
2323 static int mdc_hsm_ct_reregister(void *data, void *cb_arg)
2324 {
2325         struct obd_import *imp = (struct obd_import *)cb_arg;
2326         struct kkuc_ct_data *kcd = data;
2327         __u32 *archives = NULL;
2328         int rc;
2329
2330         if (kcd == NULL ||
2331             (kcd->kcd_magic != KKUC_CT_DATA_ARRAY_MAGIC &&
2332              kcd->kcd_magic != KKUC_CT_DATA_BITMAP_MAGIC))
2333                 return -EPROTO;
2334
2335         if (kcd->kcd_magic == KKUC_CT_DATA_BITMAP_MAGIC) {
2336                 CDEBUG(D_HA, "%s: recover copytool registration to MDT "
2337                        "(archive=%#x)\n", imp->imp_obd->obd_name,
2338                        kcd->kcd_nr_archives);
2339         } else {
2340                 CDEBUG(D_HA, "%s: recover copytool registration to MDT "
2341                        "(archive nr = %u)\n",
2342                        imp->imp_obd->obd_name, kcd->kcd_nr_archives);
2343                 if (kcd->kcd_nr_archives != 0)
2344                         archives = kcd->kcd_archives;
2345         }
2346
2347         rc = mdc_ioc_hsm_ct_register(imp, kcd->kcd_nr_archives, archives);
2348         /* ignore error if the copytool is already registered */
2349         return (rc == -EEXIST) ? 0 : rc;
2350 }
2351
2352 /**
2353  * Re-establish all kuc contexts with MDT
2354  * after MDT shutdown/recovery.
2355  */
2356 static int mdc_kuc_reregister(struct obd_import *imp)
2357 {
2358         /* re-register HSM agents */
2359         return libcfs_kkuc_group_foreach(&imp->imp_obd->obd_uuid, KUC_GRP_HSM,
2360                                          mdc_hsm_ct_reregister, imp);
2361 }
2362
2363 static int mdc_set_info_async(const struct lu_env *env,
2364                               struct obd_export *exp,
2365                               u32 keylen, void *key,
2366                               u32 vallen, void *val,
2367                               struct ptlrpc_request_set *set)
2368 {
2369         struct obd_import       *imp = class_exp2cliimp(exp);
2370         int                      rc;
2371         ENTRY;
2372
2373         if (KEY_IS(KEY_READ_ONLY)) {
2374                 if (vallen != sizeof(int))
2375                         RETURN(-EINVAL);
2376
2377                 spin_lock(&imp->imp_lock);
2378                 if (*((int *)val)) {
2379                         imp->imp_connect_flags_orig |= OBD_CONNECT_RDONLY;
2380                         imp->imp_connect_data.ocd_connect_flags |=
2381                                                         OBD_CONNECT_RDONLY;
2382                 } else {
2383                         imp->imp_connect_flags_orig &= ~OBD_CONNECT_RDONLY;
2384                         imp->imp_connect_data.ocd_connect_flags &=
2385                                                         ~OBD_CONNECT_RDONLY;
2386                 }
2387                 spin_unlock(&imp->imp_lock);
2388
2389                 rc = do_set_info_async(imp, MDS_SET_INFO, LUSTRE_MDS_VERSION,
2390                                        keylen, key, vallen, val, set);
2391                 RETURN(rc);
2392         }
2393         if (KEY_IS(KEY_CHANGELOG_CLEAR)) {
2394                 rc = do_set_info_async(imp, MDS_SET_INFO, LUSTRE_MDS_VERSION,
2395                                        keylen, key, vallen, val, set);
2396                 RETURN(rc);
2397         }
2398         if (KEY_IS(KEY_HSM_COPYTOOL_SEND)) {
2399                 rc = mdc_hsm_copytool_send(&imp->imp_obd->obd_uuid, vallen,
2400                                            val);
2401                 RETURN(rc);
2402         }
2403
2404         if (KEY_IS(KEY_DEFAULT_EASIZE)) {
2405                 __u32 *default_easize = val;
2406
2407                 exp->exp_obd->u.cli.cl_default_mds_easize = *default_easize;
2408                 RETURN(0);
2409         }
2410
2411         rc = osc_set_info_async(env, exp, keylen, key, vallen, val, set);
2412         RETURN(rc);
2413 }
2414
2415 static int mdc_get_info(const struct lu_env *env, struct obd_export *exp,
2416                         __u32 keylen, void *key, __u32 *vallen, void *val)
2417 {
2418         int rc = -EINVAL;
2419
2420         if (KEY_IS(KEY_MAX_EASIZE)) {
2421                 __u32 mdsize, *max_easize;
2422
2423                 if (*vallen != sizeof(int))
2424                         RETURN(-EINVAL);
2425                 mdsize = *(__u32 *)val;
2426                 if (mdsize > exp->exp_obd->u.cli.cl_max_mds_easize)
2427                         exp->exp_obd->u.cli.cl_max_mds_easize = mdsize;
2428                 max_easize = val;
2429                 *max_easize = exp->exp_obd->u.cli.cl_max_mds_easize;
2430                 RETURN(0);
2431         } else if (KEY_IS(KEY_DEFAULT_EASIZE)) {
2432                 __u32 *default_easize;
2433
2434                 if (*vallen != sizeof(int))
2435                         RETURN(-EINVAL);
2436                 default_easize = val;
2437                 *default_easize = exp->exp_obd->u.cli.cl_default_mds_easize;
2438                 RETURN(0);
2439         } else if (KEY_IS(KEY_CONN_DATA)) {
2440                 struct obd_import *imp = class_exp2cliimp(exp);
2441                 struct obd_connect_data *data = val;
2442
2443                 if (*vallen != sizeof(*data))
2444                         RETURN(-EINVAL);
2445
2446                 *data = imp->imp_connect_data;
2447                 RETURN(0);
2448         } else if (KEY_IS(KEY_TGT_COUNT)) {
2449                 *((__u32 *)val) = 1;
2450                 RETURN(0);
2451         }
2452
2453         rc = mdc_get_info_rpc(exp, keylen, key, *vallen, val);
2454
2455         RETURN(rc);
2456 }
2457
2458 static int mdc_fsync(struct obd_export *exp, const struct lu_fid *fid,
2459                      struct ptlrpc_request **request)
2460 {
2461         struct ptlrpc_request *req;
2462         int                    rc;
2463         ENTRY;
2464
2465         *request = NULL;
2466         req = ptlrpc_request_alloc(class_exp2cliimp(exp), &RQF_MDS_SYNC);
2467         if (req == NULL)
2468                 RETURN(-ENOMEM);
2469
2470         rc = ptlrpc_request_pack(req, LUSTRE_MDS_VERSION, MDS_SYNC);
2471         if (rc) {
2472                 ptlrpc_request_free(req);
2473                 RETURN(rc);
2474         }
2475
2476         mdc_pack_body(req, fid, 0, 0, -1, 0);
2477
2478         ptlrpc_request_set_replen(req);
2479
2480         rc = ptlrpc_queue_wait(req);
2481         if (rc)
2482                 ptlrpc_req_finished(req);
2483         else
2484                 *request = req;
2485         RETURN(rc);
2486 }
2487
2488 static int mdc_import_event(struct obd_device *obd, struct obd_import *imp,
2489                             enum obd_import_event event)
2490 {
2491         struct client_obd *cli = &obd->u.cli;
2492         int rc = 0;
2493
2494         LASSERT(imp->imp_obd == obd);
2495
2496         switch (event) {
2497         case IMP_EVENT_DISCON:
2498                 spin_lock(&cli->cl_loi_list_lock);
2499                 cli->cl_avail_grant = 0;
2500                 cli->cl_lost_grant = 0;
2501                 spin_unlock(&cli->cl_loi_list_lock);
2502                 break;
2503         case IMP_EVENT_INACTIVE:
2504                 /*
2505                  * Flush current sequence to make client obtain new one
2506                  * from server in case of disconnect/reconnect.
2507                  */
2508                 down_read(&cli->cl_seq_rwsem);
2509                 if (cli->cl_seq)
2510                         seq_client_flush(cli->cl_seq);
2511                 up_read(&cli->cl_seq_rwsem);
2512
2513                 rc = obd_notify_observer(obd, obd, OBD_NOTIFY_INACTIVE);
2514                 break;
2515         case IMP_EVENT_INVALIDATE: {
2516                 struct ldlm_namespace *ns = obd->obd_namespace;
2517                 struct lu_env *env;
2518                 __u16 refcheck;
2519
2520                 ldlm_namespace_cleanup(ns, LDLM_FL_LOCAL_ONLY);
2521
2522                 env = cl_env_get(&refcheck);
2523                 if (!IS_ERR(env)) {
2524                         /* Reset grants. All pages go to failing rpcs due to
2525                          * the invalid import.
2526                          */
2527                         osc_io_unplug(env, cli, NULL);
2528
2529                         cfs_hash_for_each_nolock(ns->ns_rs_hash,
2530                                                  osc_ldlm_resource_invalidate,
2531                                                  env, 0);
2532                         cl_env_put(env, &refcheck);
2533                         ldlm_namespace_cleanup(ns, LDLM_FL_LOCAL_ONLY);
2534                 } else {
2535                         rc = PTR_ERR(env);
2536                 }
2537                 break;
2538         }
2539         case IMP_EVENT_ACTIVE:
2540                 rc = obd_notify_observer(obd, obd, OBD_NOTIFY_ACTIVE);
2541                 /* redo the kuc registration after reconnecting */
2542                 if (rc == 0)
2543                         rc = mdc_kuc_reregister(imp);
2544                 break;
2545         case IMP_EVENT_OCD: {
2546                 struct obd_connect_data *ocd = &imp->imp_connect_data;
2547
2548                 if (OCD_HAS_FLAG(ocd, GRANT))
2549                         osc_init_grant(cli, ocd);
2550
2551                 rc = obd_notify_observer(obd, obd, OBD_NOTIFY_OCD);
2552                 break;
2553         }
2554         case IMP_EVENT_DEACTIVATE:
2555         case IMP_EVENT_ACTIVATE:
2556                 break;
2557         default:
2558                 CERROR("Unknown import event %x\n", event);
2559                 LBUG();
2560         }
2561         RETURN(rc);
2562 }
2563
2564 int mdc_fid_alloc(const struct lu_env *env, struct obd_export *exp,
2565                   struct lu_fid *fid, struct md_op_data *op_data)
2566 {
2567         struct client_obd *cli = &exp->exp_obd->u.cli;
2568         int rc = -EIO;
2569
2570         ENTRY;
2571
2572         down_read(&cli->cl_seq_rwsem);
2573         if (cli->cl_seq)
2574                 rc = seq_client_alloc_fid(env, cli->cl_seq, fid);
2575         up_read(&cli->cl_seq_rwsem);
2576
2577         RETURN(rc);
2578 }
2579
2580 static struct obd_uuid *mdc_get_uuid(struct obd_export *exp)
2581 {
2582         struct client_obd *cli = &exp->exp_obd->u.cli;
2583         return &cli->cl_target_uuid;
2584 }
2585
2586 /**
2587  * Determine whether the lock can be canceled before replaying it during
2588  * recovery, non zero value will be return if the lock can be canceled,
2589  * or zero returned for not
2590  */
2591 static int mdc_cancel_weight(struct ldlm_lock *lock)
2592 {
2593         if (lock->l_resource->lr_type != LDLM_IBITS)
2594                 RETURN(0);
2595
2596         /* FIXME: if we ever get into a situation where there are too many
2597          * opened files with open locks on a single node, then we really
2598          * should replay these open locks to reget it */
2599         if (lock->l_policy_data.l_inodebits.bits & MDS_INODELOCK_OPEN)
2600                 RETURN(0);
2601
2602         /* Special case for DoM locks, cancel only unused and granted locks */
2603         if (ldlm_has_dom(lock) &&
2604             (lock->l_granted_mode != lock->l_req_mode ||
2605              osc_ldlm_weigh_ast(lock) != 0))
2606                 RETURN(0);
2607
2608         RETURN(1);
2609 }
2610
2611 static int mdc_resource_inode_free(struct ldlm_resource *res)
2612 {
2613         if (res->lr_lvb_inode)
2614                 res->lr_lvb_inode = NULL;
2615
2616         return 0;
2617 }
2618
2619 static struct ldlm_valblock_ops inode_lvbo = {
2620         .lvbo_free = mdc_resource_inode_free
2621 };
2622
2623 static int mdc_llog_init(struct obd_device *obd)
2624 {
2625         struct obd_llog_group   *olg = &obd->obd_olg;
2626         struct llog_ctxt        *ctxt;
2627         int                      rc;
2628
2629         ENTRY;
2630
2631         rc = llog_setup(NULL, obd, olg, LLOG_CHANGELOG_REPL_CTXT, obd,
2632                         &llog_client_ops);
2633         if (rc < 0)
2634                 RETURN(rc);
2635
2636         ctxt = llog_group_get_ctxt(olg, LLOG_CHANGELOG_REPL_CTXT);
2637         llog_initiator_connect(ctxt);
2638         llog_ctxt_put(ctxt);
2639
2640         RETURN(0);
2641 }
2642
2643 static void mdc_llog_finish(struct obd_device *obd)
2644 {
2645         struct llog_ctxt *ctxt;
2646
2647         ENTRY;
2648
2649         ctxt = llog_get_context(obd, LLOG_CHANGELOG_REPL_CTXT);
2650         if (ctxt != NULL)
2651                 llog_cleanup(NULL, ctxt);
2652
2653         EXIT;
2654 }
2655
2656 int mdc_setup(struct obd_device *obd, struct lustre_cfg *cfg)
2657 {
2658         int rc;
2659
2660         ENTRY;
2661
2662         rc = osc_setup_common(obd, cfg);
2663         if (rc < 0)
2664                 RETURN(rc);
2665
2666         rc = mdc_tunables_init(obd);
2667         if (rc)
2668                 GOTO(err_osc_cleanup, rc);
2669
2670         obd->u.cli.cl_dom_min_inline_repsize = MDC_DOM_DEF_INLINE_REPSIZE;
2671
2672         ns_register_cancel(obd->obd_namespace, mdc_cancel_weight);
2673
2674         obd->obd_namespace->ns_lvbo = &inode_lvbo;
2675
2676         rc = mdc_llog_init(obd);
2677         if (rc) {
2678                 CERROR("%s: failed to setup llogging subsystems: rc = %d\n",
2679                        obd->obd_name, rc);
2680                 GOTO(err_llog_cleanup, rc);
2681         }
2682
2683         rc = mdc_changelog_cdev_init(obd);
2684         if (rc) {
2685                 CERROR("%s: failed to setup changelog char device: rc = %d\n",
2686                        obd->obd_name, rc);
2687                 GOTO(err_changelog_cleanup, rc);
2688         }
2689
2690         RETURN(rc);
2691
2692 err_changelog_cleanup:
2693         mdc_llog_finish(obd);
2694 err_llog_cleanup:
2695         lprocfs_free_md_stats(obd);
2696         ptlrpc_lprocfs_unregister_obd(obd);
2697 err_osc_cleanup:
2698         osc_cleanup_common(obd);
2699         return rc;
2700 }
2701
2702 /* Initialize the default and maximum LOV EA sizes.  This allows
2703  * us to make MDS RPCs with large enough reply buffers to hold a default
2704  * sized EA without having to calculate this (via a call into the
2705  * LOV + OSCs) each time we make an RPC.  The maximum size is also tracked
2706  * but not used to avoid wastefully vmalloc()'ing large reply buffers when
2707  * a large number of stripes is possible.  If a larger reply buffer is
2708  * required it will be reallocated in the ptlrpc layer due to overflow.
2709  */
2710 static int mdc_init_ea_size(struct obd_export *exp, __u32 easize,
2711                             __u32 def_easize)
2712 {
2713         struct obd_device *obd = exp->exp_obd;
2714         struct client_obd *cli = &obd->u.cli;
2715         ENTRY;
2716
2717         if (cli->cl_max_mds_easize < easize)
2718                 cli->cl_max_mds_easize = easize;
2719
2720         if (cli->cl_default_mds_easize < def_easize)
2721                 cli->cl_default_mds_easize = def_easize;
2722
2723         RETURN(0);
2724 }
2725
2726 static int mdc_precleanup(struct obd_device *obd)
2727 {
2728         ENTRY;
2729
2730         osc_precleanup_common(obd);
2731         mdc_changelog_cdev_finish(obd);
2732
2733         obd_cleanup_client_import(obd);
2734         ptlrpc_lprocfs_unregister_obd(obd);
2735         lprocfs_free_md_stats(obd);
2736         mdc_llog_finish(obd);
2737         RETURN(0);
2738 }
2739
2740 static int mdc_cleanup(struct obd_device *obd)
2741 {
2742         return osc_cleanup_common(obd);
2743 }
2744
2745 int mdc_process_config(struct obd_device *obd, size_t len, void *buf)
2746 {
2747         struct lustre_cfg *lcfg = buf;
2748         size_t count  = class_modify_config(lcfg, PARAM_MDC,
2749                                             &obd->obd_kset.kobj);
2750
2751         return count > 0 ? 0 : count;
2752 }
2753
2754 static struct obd_ops mdc_obd_ops = {
2755         .o_owner            = THIS_MODULE,
2756         .o_setup            = mdc_setup,
2757         .o_precleanup       = mdc_precleanup,
2758         .o_cleanup          = mdc_cleanup,
2759         .o_add_conn         = client_import_add_conn,
2760         .o_del_conn         = client_import_del_conn,
2761         .o_connect          = client_connect_import,
2762         .o_reconnect        = osc_reconnect,
2763         .o_disconnect       = osc_disconnect,
2764         .o_iocontrol        = mdc_iocontrol,
2765         .o_set_info_async   = mdc_set_info_async,
2766         .o_statfs           = mdc_statfs,
2767         .o_fid_init         = client_fid_init,
2768         .o_fid_fini         = client_fid_fini,
2769         .o_fid_alloc        = mdc_fid_alloc,
2770         .o_import_event     = mdc_import_event,
2771         .o_get_info         = mdc_get_info,
2772         .o_process_config   = mdc_process_config,
2773         .o_get_uuid         = mdc_get_uuid,
2774         .o_quotactl         = mdc_quotactl,
2775 };
2776
2777 static struct md_ops mdc_md_ops = {
2778         .m_get_root         = mdc_get_root,
2779         .m_null_inode       = mdc_null_inode,
2780         .m_close            = mdc_close,
2781         .m_create           = mdc_create,
2782         .m_enqueue          = mdc_enqueue,
2783         .m_getattr          = mdc_getattr,
2784         .m_getattr_name     = mdc_getattr_name,
2785         .m_intent_lock      = mdc_intent_lock,
2786         .m_link             = mdc_link,
2787         .m_rename           = mdc_rename,
2788         .m_setattr          = mdc_setattr,
2789         .m_setxattr         = mdc_setxattr,
2790         .m_getxattr         = mdc_getxattr,
2791         .m_fsync                = mdc_fsync,
2792         .m_file_resync          = mdc_file_resync,
2793         .m_read_page            = mdc_read_page,
2794         .m_unlink           = mdc_unlink,
2795         .m_cancel_unused    = mdc_cancel_unused,
2796         .m_init_ea_size     = mdc_init_ea_size,
2797         .m_set_lock_data    = mdc_set_lock_data,
2798         .m_lock_match       = mdc_lock_match,
2799         .m_get_lustre_md    = mdc_get_lustre_md,
2800         .m_free_lustre_md   = mdc_free_lustre_md,
2801         .m_set_open_replay_data = mdc_set_open_replay_data,
2802         .m_clear_open_replay_data = mdc_clear_open_replay_data,
2803         .m_intent_getattr_async = mdc_intent_getattr_async,
2804         .m_revalidate_lock      = mdc_revalidate_lock
2805 };
2806
2807 static int __init mdc_init(void)
2808 {
2809         return class_register_type(&mdc_obd_ops, &mdc_md_ops, true, NULL,
2810                                    LUSTRE_MDC_NAME, &mdc_device_type);
2811 }
2812
2813 static void __exit mdc_exit(void)
2814 {
2815         class_unregister_type(LUSTRE_MDC_NAME);
2816 }
2817
2818 MODULE_AUTHOR("OpenSFS, Inc. <http://www.lustre.org/>");
2819 MODULE_DESCRIPTION("Lustre Metadata Client");
2820 MODULE_VERSION(LUSTRE_VERSION_STRING);
2821 MODULE_LICENSE("GPL");
2822
2823 module_init(mdc_init);
2824 module_exit(mdc_exit);