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