lustre/mdc/mdc_request.c

   1 /*
   2  * GPL HEADER START
   3  *
   4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 only,
   8  * as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * General Public License version 2 for more details (a copy is included
  14  * in the LICENSE file that accompanied this code).
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * version 2 along with this program; If not, see
  18  * http://www.gnu.org/licenses/gpl-2.0.html
  19  *
  20  * GPL HEADER END
  21  */
  22 /*
  23  * Copyright (c) 2001, 2010, Oracle and/or its affiliates. All rights reserved.
  24  * Use is subject to license terms.
  25  *
  26  * Copyright (c) 2011, 2017, Intel Corporation.
  27  */
  28 /*
  29  * This file is part of Lustre, http://www.lustre.org/
  30  * Lustre is a trademark of Sun Microsystems, Inc.
  31  */
  32
  33 #define DEBUG_SUBSYSTEM S_MDC
  34
  35 #include <linux/init.h>
  36 #include <linux/kthread.h>
  37 #include <linux/module.h>
  38 #include <linux/pagemap.h>
  39 #include <linux/user_namespace.h>
  40 #include <linux/utsname.h>
  41 #ifdef HAVE_UIDGID_HEADER
  42 # include <linux/uidgid.h>
  43 #endif
  44
  45 #include <lustre_errno.h>
  46
  47 #include <cl_object.h>
  48 #include <llog_swab.h>
  49 #include <lprocfs_status.h>
  50 #include <lustre_acl.h>
  51 #include <lustre_fid.h>
  52 #include <uapi/linux/lustre/lustre_ioctl.h>
  53 #include <lustre_kernelcomm.h>
  54 #include <lustre_lmv.h>
  55 #include <lustre_log.h>
  56 #include <uapi/linux/lustre/lustre_param.h>
  57 #include <lustre_swab.h>
  58 #include <obd_class.h>
  59 #include <lustre_osc.h>
  60
  61 #include "mdc_internal.h"
  62
  63 #define REQUEST_MINOR 244
  64
  65 static int mdc_cleanup(struct obd_device *obd);
  66
  67 static inline int mdc_queue_wait(struct ptlrpc_request *req)
  68 {
  69         struct client_obd *cli = &req->rq_import->imp_obd->u.cli;
  70         int rc;
  71
  72         /* obd_get_request_slot() ensures that this client has no more
  73          * than cl_max_rpcs_in_flight RPCs simultaneously inf light
  74          * against an MDT. */
  75         rc = obd_get_request_slot(cli);
  76         if (rc != 0)
  77                 return rc;
  78
  79         rc = ptlrpc_queue_wait(req);
  80         obd_put_request_slot(cli);
  81
  82         return rc;
  83 }
  84
  85 /*
  86  * Send MDS_GET_ROOT RPC to fetch root FID.
  87  *
  88  * If \a fileset is not NULL it should contain a subdirectory off
  89  * the ROOT/ directory to be mounted on the client. Return the FID
  90  * of the subdirectory to the client to mount onto its mountpoint.
  91  *
  92  * \param[in]   imp     MDC import
  93  * \param[in]   fileset fileset name, which could be NULL
  94  * \param[out]  rootfid root FID of this mountpoint
  95  * \param[out]  pc      root capa will be unpacked and saved in this pointer
  96  *
  97  * \retval      0 on success, negative errno on failure
  98  */
  99 static int mdc_get_root(struct obd_export *exp, const char *fileset,
 100                          struct lu_fid *rootfid)
 101 {
 102         struct ptlrpc_request   *req;
 103         struct mdt_body         *body;
 104         int                      rc;
 105
 106         ENTRY;
 107
 108         if (fileset && !(exp_connect_flags(exp) & OBD_CONNECT_SUBTREE))
 109                 RETURN(-ENOTSUPP);
 110
 111         req = ptlrpc_request_alloc(class_exp2cliimp(exp),
 112                                 &RQF_MDS_GET_ROOT);
 113         if (req == NULL)
 114                 RETURN(-ENOMEM);
 115
 116         if (fileset != NULL)
 117                 req_capsule_set_size(&req->rq_pill, &RMF_NAME, RCL_CLIENT,
 118                                      strlen(fileset) + 1);
 119         rc = ptlrpc_request_pack(req, LUSTRE_MDS_VERSION, MDS_GET_ROOT);
 120         if (rc) {
 121                 ptlrpc_request_free(req);
 122                 RETURN(rc);
 123         }
 124         mdc_pack_body(req, NULL, 0, 0, -1, 0);
 125         if (fileset != NULL) {
 126                 char *name = req_capsule_client_get(&req->rq_pill, &RMF_NAME);
 127
 128                 memcpy(name, fileset, strlen(fileset));
 129         }
 130         lustre_msg_add_flags(req->rq_reqmsg, LUSTRE_IMP_FULL);
 131         req->rq_send_state = LUSTRE_IMP_FULL;
 132
 133         ptlrpc_request_set_replen(req);
 134
 135         rc = ptlrpc_queue_wait(req);
 136         if (rc)
 137                 GOTO(out, rc);
 138
 139         body = req_capsule_server_get(&req->rq_pill, &RMF_MDT_BODY);
 140         if (body == NULL)
 141                 GOTO(out, rc = -EPROTO);
 142
 143         *rootfid = body->mbo_fid1;
 144         CDEBUG(D_NET, "root fid="DFID", last_committed=%llu\n",
 145                PFID(rootfid), lustre_msg_get_last_committed(req->rq_repmsg));
 146         EXIT;
 147 out:
 148         ptlrpc_req_finished(req);
 149
 150         return rc;
 151 }
 152
 153 /*
 154  * This function now is known to always saying that it will receive 4 buffers
 155  * from server. Even for cases when acl_size and md_size is zero, RPC header
 156  * will contain 4 fields and RPC itself will contain zero size fields. This is
 157  * because mdt_getattr*() _always_ returns 4 fields, but if acl is not needed
 158  * and thus zero, it shrinks it, making zero size. The same story about
 159  * md_size. And this is course of problem when client waits for smaller number
 160  * of fields. This issue will be fixed later when client gets aware of RPC
 161  * layouts.  --umka
 162  */
 163 static int mdc_getattr_common(struct obd_export *exp,
 164                               struct ptlrpc_request *req)
 165 {
 166         struct req_capsule *pill = &req->rq_pill;
 167         struct mdt_body    *body;
 168         void               *eadata;
 169         int                 rc;
 170         ENTRY;
 171
 172         /* Request message already built. */
 173         rc = ptlrpc_queue_wait(req);
 174         if (rc != 0)
 175                 RETURN(rc);
 176
 177         /* sanity check for the reply */
 178         body = req_capsule_server_get(pill, &RMF_MDT_BODY);
 179         if (body == NULL)
 180                 RETURN(-EPROTO);
 181
 182         CDEBUG(D_NET, "mode: %o\n", body->mbo_mode);
 183
 184         mdc_update_max_ea_from_body(exp, body);
 185         if (body->mbo_eadatasize != 0) {
 186                 eadata = req_capsule_server_sized_get(pill, &RMF_MDT_MD,
 187                                                       body->mbo_eadatasize);
 188                 if (eadata == NULL)
 189                         RETURN(-EPROTO);
 190         }
 191
 192         RETURN(0);
 193 }
 194
 195 static void mdc_reset_acl_req(struct ptlrpc_request *req)
 196 {
 197         spin_lock(&req->rq_early_free_lock);
 198         sptlrpc_cli_free_repbuf(req);
 199         req->rq_repbuf = NULL;
 200         req->rq_repbuf_len = 0;
 201         req->rq_repdata = NULL;
 202         req->rq_reqdata_len = 0;
 203         spin_unlock(&req->rq_early_free_lock);
 204 }
 205
 206 static int mdc_getattr(struct obd_export *exp, struct md_op_data *op_data,
 207                        struct ptlrpc_request **request)
 208 {
 209         struct ptlrpc_request *req;
 210         struct obd_import *imp = class_exp2cliimp(exp);
 211         __u32 acl_bufsize = LUSTRE_POSIX_ACL_MAX_SIZE_OLD;
 212         int rc;
 213         ENTRY;
 214
 215         /* Single MDS without an LMV case */
 216         if (op_data->op_flags & MF_GET_MDT_IDX) {
 217                 op_data->op_mds = 0;
 218                 RETURN(0);
 219         }
 220
 221         *request = NULL;
 222         req = ptlrpc_request_alloc(imp, &RQF_MDS_GETATTR);
 223         if (req == NULL)
 224                 RETURN(-ENOMEM);
 225
 226         rc = ptlrpc_request_pack(req, LUSTRE_MDS_VERSION, MDS_GETATTR);
 227         if (rc) {
 228                 ptlrpc_request_free(req);
 229                 RETURN(rc);
 230         }
 231
 232 again:
 233         mdc_pack_body(req, &op_data->op_fid1, op_data->op_valid,
 234                       op_data->op_mode, -1, 0);
 235         req_capsule_set_size(&req->rq_pill, &RMF_ACL, RCL_SERVER, acl_bufsize);
 236         req_capsule_set_size(&req->rq_pill, &RMF_MDT_MD, RCL_SERVER,
 237                              op_data->op_mode);
 238         ptlrpc_request_set_replen(req);
 239
 240         rc = mdc_getattr_common(exp, req);
 241         if (rc) {
 242                 if (rc == -ERANGE &&
 243                     acl_bufsize != imp->imp_connect_data.ocd_max_easize) {
 244                         acl_bufsize = imp->imp_connect_data.ocd_max_easize;
 245                         mdc_reset_acl_req(req);
 246                         goto again;
 247                 }
 248
 249                 ptlrpc_req_finished(req);
 250         } else {
 251                 *request = req;
 252         }
 253
 254         RETURN(rc);
 255 }
 256
 257 static int mdc_getattr_name(struct obd_export *exp, struct md_op_data *op_data,
 258                             struct ptlrpc_request **request)
 259 {
 260         struct ptlrpc_request *req;
 261         struct obd_import *imp = class_exp2cliimp(exp);
 262         __u32 acl_bufsize = LUSTRE_POSIX_ACL_MAX_SIZE_OLD;
 263         int rc;
 264         ENTRY;
 265
 266         *request = NULL;
 267         req = ptlrpc_request_alloc(imp, &RQF_MDS_GETATTR_NAME);
 268         if (req == NULL)
 269                 RETURN(-ENOMEM);
 270
 271         req_capsule_set_size(&req->rq_pill, &RMF_NAME, RCL_CLIENT,
 272                              op_data->op_namelen + 1);
 273
 274         rc = ptlrpc_request_pack(req, LUSTRE_MDS_VERSION, MDS_GETATTR_NAME);
 275         if (rc) {
 276                 ptlrpc_request_free(req);
 277                 RETURN(rc);
 278         }
 279
 280         if (op_data->op_name) {
 281                 char *name = req_capsule_client_get(&req->rq_pill, &RMF_NAME);
 282                 LASSERT(strnlen(op_data->op_name, op_data->op_namelen) ==
 283                                 op_data->op_namelen);
 284                 memcpy(name, op_data->op_name, op_data->op_namelen);
 285         }
 286
 287 again:
 288         mdc_pack_body(req, &op_data->op_fid1, op_data->op_valid,
 289                       op_data->op_mode, op_data->op_suppgids[0], 0);
 290         req_capsule_set_size(&req->rq_pill, &RMF_MDT_MD, RCL_SERVER,
 291                              op_data->op_mode);
 292         req_capsule_set_size(&req->rq_pill, &RMF_ACL, RCL_SERVER, acl_bufsize);
 293         ptlrpc_request_set_replen(req);
 294
 295         rc = mdc_getattr_common(exp, req);
 296         if (rc) {
 297                 if (rc == -ERANGE &&
 298                     acl_bufsize != imp->imp_connect_data.ocd_max_easize) {
 299                         acl_bufsize = imp->imp_connect_data.ocd_max_easize;
 300                         mdc_reset_acl_req(req);
 301                         goto again;
 302                 }
 303
 304                 ptlrpc_req_finished(req);
 305         } else {
 306                 *request = req;
 307         }
 308
 309         RETURN(rc);
 310 }
 311
 312 static int mdc_xattr_common(struct obd_export *exp,const struct req_format *fmt,
 313                             const struct lu_fid *fid, int opcode, u64 valid,
 314                             const char *xattr_name, const char *input,
 315                             int input_size, int output_size, int flags,
 316                             __u32 suppgid, struct ptlrpc_request **request)
 317 {
 318         struct ptlrpc_request *req;
 319         int   xattr_namelen = 0;
 320         char *tmp;
 321         int   rc;
 322         ENTRY;
 323
 324         *request = NULL;
 325         req = ptlrpc_request_alloc(class_exp2cliimp(exp), fmt);
 326         if (req == NULL)
 327                 RETURN(-ENOMEM);
 328
 329         if (xattr_name) {
 330                 xattr_namelen = strlen(xattr_name) + 1;
 331                 req_capsule_set_size(&req->rq_pill, &RMF_NAME, RCL_CLIENT,
 332                                      xattr_namelen);
 333         }
 334         if (input_size)
 335                 LASSERT(input);
 336         req_capsule_set_size(&req->rq_pill, &RMF_EADATA, RCL_CLIENT,
 337                              input_size);
 338
 339         /* get SELinux policy info if any */
 340         rc = sptlrpc_get_sepol(req);
 341         if (rc < 0) {
 342                 ptlrpc_request_free(req);
 343                 RETURN(rc);
 344         }
 345         req_capsule_set_size(&req->rq_pill, &RMF_SELINUX_POL, RCL_CLIENT,
 346                              strlen(req->rq_sepol) ?
 347                              strlen(req->rq_sepol) + 1 : 0);
 348
 349         /* Flush local XATTR locks to get rid of a possible cancel RPC */
 350         if (opcode == MDS_REINT && fid_is_sane(fid) &&
 351             exp->exp_connect_data.ocd_ibits_known & MDS_INODELOCK_XATTR) {
 352                 struct list_head cancels = LIST_HEAD_INIT(cancels);
 353                 int count;
 354
 355                 /* Without that packing would fail */
 356                 if (input_size == 0)
 357                         req_capsule_set_size(&req->rq_pill, &RMF_EADATA,
 358                                              RCL_CLIENT, 0);
 359
 360                 count = mdc_resource_get_unused(exp, fid,
 361                                                 &cancels, LCK_EX,
 362                                                 MDS_INODELOCK_XATTR);
 363
 364                 rc = mdc_prep_elc_req(exp, req, MDS_REINT, &cancels, count);
 365                 if (rc) {
 366                         ptlrpc_request_free(req);
 367                         RETURN(rc);
 368                 }
 369         } else {
 370                 rc = ptlrpc_request_pack(req, LUSTRE_MDS_VERSION, opcode);
 371                 if (rc) {
 372                         ptlrpc_request_free(req);
 373                         RETURN(rc);
 374                 }
 375         }
 376
 377         if (opcode == MDS_REINT) {
 378                 struct mdt_rec_setxattr *rec;
 379
 380                 CLASSERT(sizeof(struct mdt_rec_setxattr) ==
 381                          sizeof(struct mdt_rec_reint));
 382                 rec = req_capsule_client_get(&req->rq_pill, &RMF_REC_REINT);
 383                 rec->sx_opcode = REINT_SETXATTR;
 384                 rec->sx_fsuid  = from_kuid(&init_user_ns, current_fsuid());
 385                 rec->sx_fsgid  = from_kgid(&init_user_ns, current_fsgid());
 386                 rec->sx_cap    = cfs_curproc_cap_pack();
 387                 rec->sx_suppgid1 = suppgid;
 388                 rec->sx_suppgid2 = -1;
 389                 rec->sx_fid    = *fid;
 390                 rec->sx_valid  = valid | OBD_MD_FLCTIME;
 391                 rec->sx_time   = ktime_get_real_seconds();
 392                 rec->sx_size   = output_size;
 393                 rec->sx_flags  = flags;
 394         } else {
 395                 mdc_pack_body(req, fid, valid, output_size, suppgid, flags);
 396         }
 397
 398         if (xattr_name) {
 399                 tmp = req_capsule_client_get(&req->rq_pill, &RMF_NAME);
 400                 memcpy(tmp, xattr_name, xattr_namelen);
 401         }
 402         if (input_size) {
 403                 tmp = req_capsule_client_get(&req->rq_pill, &RMF_EADATA);
 404                 memcpy(tmp, input, input_size);
 405         }
 406
 407         mdc_file_sepol_pack(req);
 408
 409         if (req_capsule_has_field(&req->rq_pill, &RMF_EADATA, RCL_SERVER))
 410                 req_capsule_set_size(&req->rq_pill, &RMF_EADATA,
 411                                      RCL_SERVER, output_size);
 412         ptlrpc_request_set_replen(req);
 413
 414         /* make rpc */
 415         if (opcode == MDS_REINT)
 416                 mdc_get_mod_rpc_slot(req, NULL);
 417
 418         rc = ptlrpc_queue_wait(req);
 419
 420         if (opcode == MDS_REINT)
 421                 mdc_put_mod_rpc_slot(req, NULL);
 422
 423         if (rc)
 424                 ptlrpc_req_finished(req);
 425         else
 426                 *request = req;
 427         RETURN(rc);
 428 }
 429
 430 static int mdc_setxattr(struct obd_export *exp, const struct lu_fid *fid,
 431                         u64 obd_md_valid, const char *name,
 432                         const void *value, size_t value_size,
 433                         unsigned int xattr_flags, u32 suppgid,
 434                         struct ptlrpc_request **req)
 435 {
 436         LASSERT(obd_md_valid == OBD_MD_FLXATTR ||
 437                 obd_md_valid == OBD_MD_FLXATTRRM);
 438
 439         return mdc_xattr_common(exp, &RQF_MDS_REINT_SETXATTR,
 440                                 fid, MDS_REINT, obd_md_valid, name,
 441                                 value, value_size, 0, xattr_flags, suppgid,
 442                                 req);
 443 }
 444
 445 static int mdc_getxattr(struct obd_export *exp, const struct lu_fid *fid,
 446                         u64 obd_md_valid, const char *name, size_t buf_size,
 447                         struct ptlrpc_request **req)
 448 {
 449         struct mdt_body *body;
 450         int rc;
 451
 452         LASSERT(obd_md_valid == OBD_MD_FLXATTR ||
 453                 obd_md_valid == OBD_MD_FLXATTRLS);
 454
 455         rc = mdc_xattr_common(exp, &RQF_MDS_GETXATTR, fid, MDS_GETXATTR,
 456                               obd_md_valid, name, NULL, 0, buf_size, 0, -1,
 457                               req);
 458         if (rc < 0)
 459                 GOTO(out, rc);
 460
 461         body = req_capsule_server_get(&(*req)->rq_pill, &RMF_MDT_BODY);
 462         if (body == NULL)
 463                 GOTO(out, rc = -EPROTO);
 464
 465         /* only detect the xattr size */
 466         if (buf_size == 0) {
 467                 /* LU-11109: Older MDTs do not distinguish
 468                  * between nonexistent xattrs and zero length
 469                  * values in this case. Newer MDTs will return
 470                  * -ENODATA or set OBD_MD_FLXATTR. */
 471                 GOTO(out, rc = body->mbo_eadatasize);
 472         }
 473
 474         if (body->mbo_eadatasize == 0) {
 475                 /* LU-11109: Newer MDTs set OBD_MD_FLXATTR on
 476                  * success so that we can distinguish between
 477                  * zero length value and nonexistent xattr.
 478                  *
 479                  * If OBD_MD_FLXATTR is not set then we keep
 480                  * the old behavior and return -ENODATA for
 481                  * getxattr() when mbo_eadatasize is 0. But
 482                  * -ENODATA only makes sense for getxattr()
 483                  * and not for listxattr(). */
 484                 if (body->mbo_valid & OBD_MD_FLXATTR)
 485                         GOTO(out, rc = 0);
 486                 else if (obd_md_valid == OBD_MD_FLXATTR)
 487                         GOTO(out, rc = -ENODATA);
 488                 else
 489                         GOTO(out, rc = 0);
 490         }
 491
 492         GOTO(out, rc = body->mbo_eadatasize);
 493 out:
 494         if (rc < 0) {
 495                 ptlrpc_req_finished(*req);
 496                 *req = NULL;
 497         }
 498
 499         return rc;
 500 }
 501
 502 #ifdef CONFIG_FS_POSIX_ACL
 503 static int mdc_unpack_acl(struct ptlrpc_request *req, struct lustre_md *md)
 504 {
 505         struct req_capsule     *pill = &req->rq_pill;
 506         struct mdt_body        *body = md->body;
 507         struct posix_acl       *acl;
 508         void                   *buf;
 509         int                     rc;
 510         ENTRY;
 511
 512         if (!body->mbo_aclsize)
 513                 RETURN(0);
 514
 515         buf = req_capsule_server_sized_get(pill, &RMF_ACL, body->mbo_aclsize);
 516
 517         if (!buf)
 518                 RETURN(-EPROTO);
 519
 520         acl = posix_acl_from_xattr(&init_user_ns, buf, body->mbo_aclsize);
 521         if (acl == NULL)
 522                 RETURN(0);
 523         if (IS_ERR(acl)) {
 524                 rc = PTR_ERR(acl);
 525                 CERROR("convert xattr to acl: %d\n", rc);
 526                 RETURN(rc);
 527         }
 528
 529         rc = posix_acl_valid(&init_user_ns, acl);
 530         if (rc) {
 531                 CERROR("validate acl: %d\n", rc);
 532                 posix_acl_release(acl);
 533                 RETURN(rc);
 534         }
 535
 536         md->posix_acl = acl;
 537         RETURN(0);
 538 }
 539 #else
 540 #define mdc_unpack_acl(req, md) 0
 541 #endif
 542
 543 int mdc_get_lustre_md(struct obd_export *exp, struct ptlrpc_request *req,
 544                       struct obd_export *dt_exp, struct obd_export *md_exp,
 545                       struct lustre_md *md)
 546 {
 547         struct req_capsule *pill = &req->rq_pill;
 548         int rc;
 549         ENTRY;
 550
 551         LASSERT(md);
 552         memset(md, 0, sizeof(*md));
 553
 554         md->body = req_capsule_server_get(pill, &RMF_MDT_BODY);
 555         LASSERT(md->body != NULL);
 556
 557         if (md->body->mbo_valid & OBD_MD_FLEASIZE) {
 558                 if (!S_ISREG(md->body->mbo_mode)) {
 559                         CDEBUG(D_INFO, "OBD_MD_FLEASIZE set, should be a "
 560                                "regular file, but is not\n");
 561                         GOTO(out, rc = -EPROTO);
 562                 }
 563
 564                 if (md->body->mbo_eadatasize == 0) {
 565                         CDEBUG(D_INFO, "OBD_MD_FLEASIZE set, "
 566                                "but eadatasize 0\n");
 567                         GOTO(out, rc = -EPROTO);
 568                 }
 569
 570                 md->layout.lb_len = md->body->mbo_eadatasize;
 571                 md->layout.lb_buf = req_capsule_server_sized_get(pill,
 572                                                         &RMF_MDT_MD,
 573                                                         md->layout.lb_len);
 574                 if (md->layout.lb_buf == NULL)
 575                         GOTO(out, rc = -EPROTO);
 576         } else if (md->body->mbo_valid & OBD_MD_FLDIREA) {
 577                 const union lmv_mds_md *lmv;
 578                 size_t lmv_size;
 579
 580                 if (!S_ISDIR(md->body->mbo_mode)) {
 581                         CDEBUG(D_INFO, "OBD_MD_FLDIREA set, should be a "
 582                                "directory, but is not\n");
 583                         GOTO(out, rc = -EPROTO);
 584                 }
 585
 586                 lmv_size = md->body->mbo_eadatasize;
 587                 if (lmv_size == 0) {
 588                         CDEBUG(D_INFO, "OBD_MD_FLDIREA is set, "
 589                                "but eadatasize 0\n");
 590                         RETURN(-EPROTO);
 591                 }
 592
 593                 if (md->body->mbo_valid & OBD_MD_MEA) {
 594                         lmv = req_capsule_server_sized_get(pill, &RMF_MDT_MD,
 595                                                            lmv_size);
 596                         if (lmv == NULL)
 597                                 GOTO(out, rc = -EPROTO);
 598
 599                         rc = md_unpackmd(md_exp, &md->lmv, lmv, lmv_size);
 600                         if (rc < 0)
 601                                 GOTO(out, rc);
 602
 603                         if (rc < (typeof(rc))sizeof(*md->lmv)) {
 604                                 CDEBUG(D_INFO, "size too small:  "
 605                                        "rc < sizeof(*md->lmv) (%d < %d)\n",
 606                                         rc, (int)sizeof(*md->lmv));
 607                                 GOTO(out, rc = -EPROTO);
 608                         }
 609                 }
 610         }
 611         rc = 0;
 612
 613         if (md->body->mbo_valid & OBD_MD_FLACL) {
 614                 /* for ACL, it's possible that FLACL is set but aclsize is zero.
 615                  * only when aclsize != 0 there's an actual segment for ACL
 616                  * in reply buffer.
 617                  */
 618                 if (md->body->mbo_aclsize) {
 619                         rc = mdc_unpack_acl(req, md);
 620                         if (rc)
 621                                 GOTO(out, rc);
 622 #ifdef CONFIG_FS_POSIX_ACL
 623                 } else {
 624                         md->posix_acl = NULL;
 625 #endif
 626                 }
 627         }
 628
 629         EXIT;
 630 out:
 631         if (rc) {
 632 #ifdef CONFIG_FS_POSIX_ACL
 633                 posix_acl_release(md->posix_acl);
 634 #endif
 635         }
 636         return rc;
 637 }
 638
 639 int mdc_free_lustre_md(struct obd_export *exp, struct lustre_md *md)
 640 {
 641         ENTRY;
 642         RETURN(0);
 643 }
 644
 645 void mdc_replay_open(struct ptlrpc_request *req)
 646 {
 647         struct md_open_data *mod = req->rq_cb_data;
 648         struct ptlrpc_request *close_req;
 649         struct obd_client_handle *och;
 650         struct lustre_handle old_open_handle = { };
 651         struct mdt_body *body;
 652         ENTRY;
 653
 654         if (mod == NULL) {
 655                 DEBUG_REQ(D_ERROR, req,
 656                           "Can't properly replay without open data.");
 657                 EXIT;
 658                 return;
 659         }
 660
 661         body = req_capsule_server_get(&req->rq_pill, &RMF_MDT_BODY);
 662         LASSERT(body != NULL);
 663
 664         spin_lock(&req->rq_lock);
 665         och = mod->mod_och;
 666         if (och && och->och_open_handle.cookie)
 667                 req->rq_early_free_repbuf = 1;
 668         else
 669                 req->rq_early_free_repbuf = 0;
 670         spin_unlock(&req->rq_lock);
 671
 672         if (req->rq_early_free_repbuf) {
 673                 struct lustre_handle *file_open_handle;
 674
 675                 LASSERT(och->och_magic == OBD_CLIENT_HANDLE_MAGIC);
 676
 677                 file_open_handle = &och->och_open_handle;
 678                 CDEBUG(D_HA, "updating handle from %#llx to %#llx\n",
 679                        file_open_handle->cookie, body->mbo_open_handle.cookie);
 680                 old_open_handle = *file_open_handle;
 681                 *file_open_handle = body->mbo_open_handle;
 682         }
 683
 684         close_req = mod->mod_close_req;
 685         if (close_req) {
 686                 __u32 opc = lustre_msg_get_opc(close_req->rq_reqmsg);
 687                 struct mdt_ioepoch *epoch;
 688
 689                 LASSERT(opc == MDS_CLOSE);
 690                 epoch = req_capsule_client_get(&close_req->rq_pill,
 691                                                &RMF_MDT_EPOCH);
 692                 LASSERT(epoch);
 693
 694                 if (req->rq_early_free_repbuf)
 695                         LASSERT(old_open_handle.cookie ==
 696                                 epoch->mio_open_handle.cookie);
 697
 698                 DEBUG_REQ(D_HA, close_req, "updating close body with new fh");
 699                 epoch->mio_open_handle = body->mbo_open_handle;
 700         }
 701         EXIT;
 702 }
 703
 704 void mdc_commit_open(struct ptlrpc_request *req)
 705 {
 706         struct md_open_data *mod = req->rq_cb_data;
 707         if (mod == NULL)
 708                 return;
 709
 710         /**
 711          * No need to touch md_open_data::mod_och, it holds a reference on
 712          * \var mod and will zero references to each other, \var mod will be
 713          * freed after that when md_open_data::mod_och will put the reference.
 714          */
 715
 716         /**
 717          * Do not let open request to disappear as it still may be needed
 718          * for close rpc to happen (it may happen on evict only, otherwise
 719          * ptlrpc_request::rq_replay does not let mdc_commit_open() to be
 720          * called), just mark this rpc as committed to distinguish these 2
 721          * cases, see mdc_close() for details. The open request reference will
 722          * be put along with freeing \var mod.
 723          */
 724         ptlrpc_request_addref(req);
 725         spin_lock(&req->rq_lock);
 726         req->rq_committed = 1;
 727         spin_unlock(&req->rq_lock);
 728         req->rq_cb_data = NULL;
 729         obd_mod_put(mod);
 730 }
 731
 732 int mdc_set_open_replay_data(struct obd_export *exp,
 733                              struct obd_client_handle *och,
 734                              struct lookup_intent *it)
 735 {
 736         struct md_open_data     *mod;
 737         struct mdt_rec_create   *rec;
 738         struct mdt_body         *body;
 739         struct ptlrpc_request   *open_req = it->it_request;
 740         struct obd_import       *imp = open_req->rq_import;
 741         ENTRY;
 742
 743         if (!open_req->rq_replay)
 744                 RETURN(0);
 745
 746         rec = req_capsule_client_get(&open_req->rq_pill, &RMF_REC_REINT);
 747         body = req_capsule_server_get(&open_req->rq_pill, &RMF_MDT_BODY);
 748         LASSERT(rec != NULL);
 749         /* Incoming message in my byte order (it's been swabbed). */
 750         /* Outgoing messages always in my byte order. */
 751         LASSERT(body != NULL);
 752
 753         /* Only if the import is replayable, we set replay_open data */
 754         if (och && imp->imp_replayable) {
 755                 mod = obd_mod_alloc();
 756                 if (mod == NULL) {
 757                         DEBUG_REQ(D_ERROR, open_req,
 758                                   "Can't allocate md_open_data");
 759                         RETURN(0);
 760                 }
 761
 762                 /**
 763                  * Take a reference on \var mod, to be freed on mdc_close().
 764                  * It protects \var mod from being freed on eviction (commit
 765                  * callback is called despite rq_replay flag).
 766                  * Another reference for \var och.
 767                  */
 768                 obd_mod_get(mod);
 769                 obd_mod_get(mod);
 770
 771                 spin_lock(&open_req->rq_lock);
 772                 och->och_mod = mod;
 773                 mod->mod_och = och;
 774                 mod->mod_is_create = it_disposition(it, DISP_OPEN_CREATE) ||
 775                                      it_disposition(it, DISP_OPEN_STRIPE);
 776                 mod->mod_open_req = open_req;
 777                 open_req->rq_cb_data = mod;
 778                 open_req->rq_commit_cb = mdc_commit_open;
 779                 open_req->rq_early_free_repbuf = 1;
 780                 spin_unlock(&open_req->rq_lock);
 781         }
 782
 783         rec->cr_fid2 = body->mbo_fid1;
 784         rec->cr_open_handle_old = body->mbo_open_handle;
 785         open_req->rq_replay_cb = mdc_replay_open;
 786         if (!fid_is_sane(&body->mbo_fid1)) {
 787                 DEBUG_REQ(D_ERROR, open_req,
 788                           "saving replay request with insane FID " DFID,
 789                           PFID(&body->mbo_fid1));
 790                 LBUG();
 791         }
 792
 793         DEBUG_REQ(D_RPCTRACE, open_req, "Set up open replay data");
 794         RETURN(0);
 795 }
 796
 797 static void mdc_free_open(struct md_open_data *mod)
 798 {
 799         int committed = 0;
 800
 801         if (mod->mod_is_create == 0 &&
 802             imp_connect_disp_stripe(mod->mod_open_req->rq_import))
 803                 committed = 1;
 804
 805         /**
 806          * No reason to asssert here if the open request has
 807          * rq_replay == 1. It means that mdc_close failed, and
 808          * close request wasn`t sent. It is not fatal to client.
 809          * The worst thing is eviction if the client gets open lock
 810          **/
 811
 812         DEBUG_REQ(D_RPCTRACE, mod->mod_open_req, "free open request rq_replay"
 813                   "= %d\n", mod->mod_open_req->rq_replay);
 814
 815         ptlrpc_request_committed(mod->mod_open_req, committed);
 816         if (mod->mod_close_req)
 817                 ptlrpc_request_committed(mod->mod_close_req, committed);
 818 }
 819
 820 int mdc_clear_open_replay_data(struct obd_export *exp,
 821                                struct obd_client_handle *och)
 822 {
 823         struct md_open_data *mod = och->och_mod;
 824         ENTRY;
 825
 826         /**
 827          * It is possible to not have \var mod in a case of eviction between
 828          * lookup and ll_file_open().
 829          **/
 830         if (mod == NULL)
 831                 RETURN(0);
 832
 833         LASSERT(mod != LP_POISON);
 834         LASSERT(mod->mod_open_req != NULL);
 835
 836         spin_lock(&mod->mod_open_req->rq_lock);
 837         if (mod->mod_och)
 838                 mod->mod_och->och_open_handle.cookie = 0;
 839         mod->mod_open_req->rq_early_free_repbuf = 0;
 840         spin_unlock(&mod->mod_open_req->rq_lock);
 841         mdc_free_open(mod);
 842
 843         mod->mod_och = NULL;
 844         och->och_mod = NULL;
 845         obd_mod_put(mod);
 846
 847         RETURN(0);
 848 }
 849
 850 static int mdc_close(struct obd_export *exp, struct md_op_data *op_data,
 851                      struct md_open_data *mod, struct ptlrpc_request **request)
 852 {
 853         struct obd_device     *obd = class_exp2obd(exp);
 854         struct ptlrpc_request *req;
 855         struct req_format     *req_fmt;
 856         size_t                 u32_count = 0;
 857         int                    rc;
 858         int                    saved_rc = 0;
 859         ENTRY;
 860
 861         CDEBUG(D_INODE, "%s: "DFID" file closed with intent: %x\n",
 862                exp->exp_obd->obd_name, PFID(&op_data->op_fid1),
 863                op_data->op_bias);
 864
 865         if (op_data->op_bias & MDS_CLOSE_INTENT) {
 866                 req_fmt = &RQF_MDS_CLOSE_INTENT;
 867                 if (op_data->op_bias & MDS_HSM_RELEASE) {
 868                         /* allocate a FID for volatile file */
 869                         rc = mdc_fid_alloc(NULL, exp, &op_data->op_fid2,
 870                                            op_data);
 871                         if (rc < 0) {
 872                                 CERROR("%s: "DFID" allocating FID: rc = %d\n",
 873                                        obd->obd_name, PFID(&op_data->op_fid1),
 874                                        rc);
 875                                 /* save the errcode and proceed to close */
 876                                 saved_rc = rc;
 877                         }
 878                 }
 879                 if (op_data->op_bias & MDS_CLOSE_RESYNC_DONE) {
 880                         size_t count = op_data->op_data_size / sizeof(__u32);
 881
 882                         if (count > INLINE_RESYNC_ARRAY_SIZE)
 883                                 u32_count = count;
 884                 }
 885         } else {
 886                 req_fmt = &RQF_MDS_CLOSE;
 887         }
 888
 889         *request = NULL;
 890         if (OBD_FAIL_CHECK(OBD_FAIL_MDC_CLOSE))
 891                 req = NULL;
 892         else
 893                 req = ptlrpc_request_alloc(class_exp2cliimp(exp), req_fmt);
 894
 895         /* Ensure that this close's handle is fixed up during replay. */
 896         if (likely(mod != NULL)) {
 897                 LASSERTF(mod->mod_open_req != NULL &&
 898                          mod->mod_open_req->rq_type != LI_POISON,
 899                          "POISONED open %p!\n", mod->mod_open_req);
 900
 901                 mod->mod_close_req = req;
 902
 903                 DEBUG_REQ(D_HA, mod->mod_open_req, "matched open");
 904                 /* We no longer want to preserve this open for replay even
 905                  * though the open was committed. b=3632, b=3633 */
 906                 spin_lock(&mod->mod_open_req->rq_lock);
 907                 mod->mod_open_req->rq_replay = 0;
 908                 spin_unlock(&mod->mod_open_req->rq_lock);
 909         } else {
 910                 CDEBUG(D_HA, "couldn't find open req; expecting close error\n");
 911         }
 912         if (req == NULL) {
 913                 /**
 914                  * TODO: repeat close after errors
 915                  */
 916                 CWARN("%s: close of FID "DFID" failed, file reference will be "
 917                       "dropped when this client unmounts or is evicted\n",
 918                       obd->obd_name, PFID(&op_data->op_fid1));
 919                 GOTO(out, rc = -ENOMEM);
 920         }
 921
 922         if (u32_count > 0)
 923                 req_capsule_set_size(&req->rq_pill, &RMF_U32, RCL_CLIENT,
 924                                      u32_count * sizeof(__u32));
 925
 926         rc = ptlrpc_request_pack(req, LUSTRE_MDS_VERSION, MDS_CLOSE);
 927         if (rc) {
 928                 ptlrpc_request_free(req);
 929                 req = NULL;
 930                 GOTO(out, rc);
 931         }
 932
 933         /* To avoid a livelock (bug 7034), we need to send CLOSE RPCs to a
 934          * portal whose threads are not taking any DLM locks and are therefore
 935          * always progressing */
 936         req->rq_request_portal = MDS_READPAGE_PORTAL;
 937         ptlrpc_at_set_req_timeout(req);
 938
 939
 940         mdc_close_pack(req, op_data);
 941
 942         req_capsule_set_size(&req->rq_pill, &RMF_MDT_MD, RCL_SERVER,
 943                              obd->u.cli.cl_default_mds_easize);
 944
 945         ptlrpc_request_set_replen(req);
 946
 947         mdc_get_mod_rpc_slot(req, NULL);
 948         rc = ptlrpc_queue_wait(req);
 949         mdc_put_mod_rpc_slot(req, NULL);
 950
 951         if (req->rq_repmsg == NULL) {
 952                 CDEBUG(D_RPCTRACE, "request failed to send: %p, %d\n", req,
 953                        req->rq_status);
 954                 if (rc == 0)
 955                         rc = req->rq_status ?: -EIO;
 956         } else if (rc == 0 || rc == -EAGAIN) {
 957                 struct mdt_body *body;
 958
 959                 rc = lustre_msg_get_status(req->rq_repmsg);
 960                 if (lustre_msg_get_type(req->rq_repmsg) == PTL_RPC_MSG_ERR) {
 961                         DEBUG_REQ(D_ERROR, req, "type == PTL_RPC_MSG_ERR, err "
 962                                   "= %d", rc);
 963                         if (rc > 0)
 964                                 rc = -rc;
 965                 }
 966                 body = req_capsule_server_get(&req->rq_pill, &RMF_MDT_BODY);
 967                 if (body == NULL)
 968                         rc = -EPROTO;
 969         } else if (rc == -ESTALE) {
 970                 /**
 971                  * it can be allowed error after 3633 if open was committed and
 972                  * server failed before close was sent. Let's check if mod
 973                  * exists and return no error in that case
 974                  */
 975                 if (mod) {
 976                         DEBUG_REQ(D_HA, req, "Reset ESTALE = %d", rc);
 977                         LASSERT(mod->mod_open_req != NULL);
 978                         if (mod->mod_open_req->rq_committed)
 979                                 rc = 0;
 980                 }
 981         }
 982
 983 out:
 984         if (mod) {
 985                 if (rc != 0)
 986                         mod->mod_close_req = NULL;
 987                 /* Since now, mod is accessed through open_req only,
 988                  * thus close req does not keep a reference on mod anymore. */
 989                 obd_mod_put(mod);
 990         }
 991         *request = req;
 992
 993         RETURN(rc < 0 ? rc : saved_rc);
 994 }
 995
 996 static int mdc_getpage(struct obd_export *exp, const struct lu_fid *fid,
 997                        u64 offset, struct page **pages, int npages,
 998                        struct ptlrpc_request **request)
 999 {
1000         struct ptlrpc_request   *req;
1001         struct ptlrpc_bulk_desc *desc;
1002         int                      i;
1003         wait_queue_head_t        waitq;
1004         int                      resends = 0;
1005         struct l_wait_info       lwi;
1006         int                      rc;
1007         ENTRY;
1008
1009         *request = NULL;
1010         init_waitqueue_head(&waitq);
1011
1012 restart_bulk:
1013         req = ptlrpc_request_alloc(class_exp2cliimp(exp), &RQF_MDS_READPAGE);
1014         if (req == NULL)
1015                 RETURN(-ENOMEM);
1016
1017         rc = ptlrpc_request_pack(req, LUSTRE_MDS_VERSION, MDS_READPAGE);
1018         if (rc) {
1019                 ptlrpc_request_free(req);
1020                 RETURN(rc);
1021         }
1022
1023         req->rq_request_portal = MDS_READPAGE_PORTAL;
1024         ptlrpc_at_set_req_timeout(req);
1025
1026         desc = ptlrpc_prep_bulk_imp(req, npages, 1,
1027                                     PTLRPC_BULK_PUT_SINK | PTLRPC_BULK_BUF_KIOV,
1028                                     MDS_BULK_PORTAL,
1029                                     &ptlrpc_bulk_kiov_pin_ops);
1030         if (desc == NULL) {
1031                 ptlrpc_req_finished(req);
1032                 RETURN(-ENOMEM);
1033         }
1034
1035         /* NB req now owns desc and will free it when it gets freed */
1036         for (i = 0; i < npages; i++)
1037                 desc->bd_frag_ops->add_kiov_frag(desc, pages[i], 0,
1038                                                  PAGE_SIZE);
1039
1040         mdc_readdir_pack(req, offset, PAGE_SIZE * npages, fid);
1041
1042         ptlrpc_request_set_replen(req);
1043         rc = ptlrpc_queue_wait(req);
1044         if (rc) {
1045                 ptlrpc_req_finished(req);
1046                 if (rc != -ETIMEDOUT)
1047                         RETURN(rc);
1048
1049                 resends++;
1050                 if (!client_should_resend(resends, &exp->exp_obd->u.cli)) {
1051                         CERROR("%s: too many resend retries: rc = %d\n",
1052                                exp->exp_obd->obd_name, -EIO);
1053                         RETURN(-EIO);
1054                 }
1055                 lwi = LWI_TIMEOUT_INTR(cfs_time_seconds(resends), NULL, NULL,
1056                                        NULL);
1057                 l_wait_event(waitq, 0, &lwi);
1058
1059                 goto restart_bulk;
1060         }
1061
1062         rc = sptlrpc_cli_unwrap_bulk_read(req, req->rq_bulk,
1063                                           req->rq_bulk->bd_nob_transferred);
1064         if (rc < 0) {
1065                 ptlrpc_req_finished(req);
1066                 RETURN(rc);
1067         }
1068
1069         if (req->rq_bulk->bd_nob_transferred & ~LU_PAGE_MASK) {
1070                 CERROR("%s: unexpected bytes transferred: %d (%ld expected)\n",
1071                        exp->exp_obd->obd_name, req->rq_bulk->bd_nob_transferred,
1072                        PAGE_SIZE * npages);
1073                 ptlrpc_req_finished(req);
1074                 RETURN(-EPROTO);
1075         }
1076
1077         *request = req;
1078         RETURN(0);
1079 }
1080
1081 static void mdc_release_page(struct page *page, int remove)
1082 {
1083         if (remove) {
1084                 lock_page(page);
1085                 if (likely(page->mapping != NULL))
1086                         truncate_complete_page(page->mapping, page);
1087                 unlock_page(page);
1088         }
1089         put_page(page);
1090 }
1091
1092 static struct page *mdc_page_locate(struct address_space *mapping, __u64 *hash,
1093                                     __u64 *start, __u64 *end, int hash64)
1094 {
1095         /*
1096          * Complement of hash is used as an index so that
1097          * radix_tree_gang_lookup() can be used to find a page with starting
1098          * hash _smaller_ than one we are looking for.
1099          */
1100         unsigned long offset = hash_x_index(*hash, hash64);
1101         struct page *page;
1102         int found;
1103
1104         spin_lock_irq(&mapping->tree_lock);
1105         found = radix_tree_gang_lookup(&mapping->page_tree,
1106                                        (void **)&page, offset, 1);
1107         if (found > 0 && !radix_tree_exceptional_entry(page)) {
1108                 struct lu_dirpage *dp;
1109
1110                 get_page(page);
1111                 spin_unlock_irq(&mapping->tree_lock);
1112                 /*
1113                  * In contrast to find_lock_page() we are sure that directory
1114                  * page cannot be truncated (while DLM lock is held) and,
1115                  * hence, can avoid restart.
1116                  *
1117                  * In fact, page cannot be locked here at all, because
1118                  * mdc_read_page_remote does synchronous io.
1119                  */
1120                 wait_on_page_locked(page);
1121                 if (PageUptodate(page)) {
1122                         dp = kmap(page);
1123                         if (BITS_PER_LONG == 32 && hash64) {
1124                                 *start = le64_to_cpu(dp->ldp_hash_start) >> 32;
1125                                 *end   = le64_to_cpu(dp->ldp_hash_end) >> 32;
1126                                 *hash  = *hash >> 32;
1127                         } else {
1128                                 *start = le64_to_cpu(dp->ldp_hash_start);
1129                                 *end   = le64_to_cpu(dp->ldp_hash_end);
1130                         }
1131                         if (unlikely(*start == 1 && *hash == 0))
1132                                 *hash = *start;
1133                         else
1134                                 LASSERTF(*start <= *hash, "start = %#llx"
1135                                          ",end = %#llx,hash = %#llx\n",
1136                                          *start, *end, *hash);
1137                         CDEBUG(D_VFSTRACE, "offset %lx [%#llx %#llx],"
1138                               " hash %#llx\n", offset, *start, *end, *hash);
1139                         if (*hash > *end) {
1140                                 kunmap(page);
1141                                 mdc_release_page(page, 0);
1142                                 page = NULL;
1143                         } else if (*end != *start && *hash == *end) {
1144                                 /*
1145                                  * upon hash collision, remove this page,
1146                                  * otherwise put page reference, and
1147                                  * mdc_read_page_remote() will issue RPC to
1148                                  * fetch the page we want.
1149                                  */
1150                                 kunmap(page);
1151                                 mdc_release_page(page,
1152                                     le32_to_cpu(dp->ldp_flags) & LDF_COLLIDE);
1153                                 page = NULL;
1154                         }
1155                 } else {
1156                         put_page(page);
1157                         page = ERR_PTR(-EIO);
1158                 }
1159         } else {
1160                 spin_unlock_irq(&mapping->tree_lock);
1161                 page = NULL;
1162         }
1163         return page;
1164 }
1165
1166 /*
1167  * Adjust a set of pages, each page containing an array of lu_dirpages,
1168  * so that each page can be used as a single logical lu_dirpage.
1169  *
1170  * A lu_dirpage is laid out as follows, where s = ldp_hash_start,
1171  * e = ldp_hash_end, f = ldp_flags, p = padding, and each "ent" is a
1172  * struct lu_dirent.  It has size up to LU_PAGE_SIZE. The ldp_hash_end
1173  * value is used as a cookie to request the next lu_dirpage in a
1174  * directory listing that spans multiple pages (two in this example):
1175  *   ________
1176  *  |        |
1177  * .|--------v-------   -----.
1178  * |s|e|f|p|ent|ent| ... |ent|
1179  * '--|--------------   -----'   Each PAGE contains a single
1180  *    '------.                   lu_dirpage.
1181  * .---------v-------   -----.
1182  * |s|e|f|p|ent| 0 | ... | 0 |
1183  * '-----------------   -----'
1184  *
1185  * However, on hosts where the native VM page size (PAGE_SIZE) is
1186  * larger than LU_PAGE_SIZE, a single host page may contain multiple
1187  * lu_dirpages. After reading the lu_dirpages from the MDS, the
1188  * ldp_hash_end of the first lu_dirpage refers to the one immediately
1189  * after it in the same PAGE (arrows simplified for brevity, but
1190  * in general e0==s1, e1==s2, etc.):
1191  *
1192  * .--------------------   -----.
1193  * |s0|e0|f0|p|ent|ent| ... |ent|
1194  * |---v----------------   -----|
1195  * |s1|e1|f1|p|ent|ent| ... |ent|
1196  * |---v----------------   -----|  Here, each PAGE contains
1197  *             ...                 multiple lu_dirpages.
1198  * |---v----------------   -----|
1199  * |s'|e'|f'|p|ent|ent| ... |ent|
1200  * '---|----------------   -----'
1201  *     v
1202  * .----------------------------.
1203  * |        next PAGE           |
1204  *
1205  * This structure is transformed into a single logical lu_dirpage as follows:
1206  *
1207  * - Replace e0 with e' so the request for the next lu_dirpage gets the page
1208  *   labeled 'next PAGE'.
1209  *
1210  * - Copy the LDF_COLLIDE flag from f' to f0 to correctly reflect whether
1211  *   a hash collision with the next page exists.
1212  *
1213  * - Adjust the lde_reclen of the ending entry of each lu_dirpage to span
1214  *   to the first entry of the next lu_dirpage.
1215  */
1216 #if PAGE_SIZE > LU_PAGE_SIZE
1217 static void mdc_adjust_dirpages(struct page **pages, int cfs_pgs, int lu_pgs)
1218 {
1219         int i;
1220
1221         for (i = 0; i < cfs_pgs; i++) {
1222                 struct lu_dirpage       *dp = kmap(pages[i]);
1223                 struct lu_dirpage       *first = dp;
1224                 struct lu_dirent        *end_dirent = NULL;
1225                 struct lu_dirent        *ent;
1226                 __u64           hash_end = le64_to_cpu(dp->ldp_hash_end);
1227                 __u32           flags = le32_to_cpu(dp->ldp_flags);
1228
1229                 while (--lu_pgs > 0) {
1230                         ent = lu_dirent_start(dp);
1231                         for (end_dirent = ent; ent != NULL;
1232                              end_dirent = ent, ent = lu_dirent_next(ent));
1233
1234                         /* Advance dp to next lu_dirpage. */
1235                         dp = (struct lu_dirpage *)((char *)dp + LU_PAGE_SIZE);
1236
1237                         /* Check if we've reached the end of the PAGE. */
1238                         if (!((unsigned long)dp & ~PAGE_MASK))
1239                                 break;
1240
1241                         /* Save the hash and flags of this lu_dirpage. */
1242                         hash_end = le64_to_cpu(dp->ldp_hash_end);
1243                         flags = le32_to_cpu(dp->ldp_flags);
1244
1245                         /* Check if lu_dirpage contains no entries. */
1246                         if (end_dirent == NULL)
1247                                 break;
1248
1249                         /* Enlarge the end entry lde_reclen from 0 to
1250                          * first entry of next lu_dirpage. */
1251                         LASSERT(le16_to_cpu(end_dirent->lde_reclen) == 0);
1252                         end_dirent->lde_reclen =
1253                                 cpu_to_le16((char *)(dp->ldp_entries) -
1254                                             (char *)end_dirent);
1255                 }
1256
1257                 first->ldp_hash_end = hash_end;
1258                 first->ldp_flags &= ~cpu_to_le32(LDF_COLLIDE);
1259                 first->ldp_flags |= flags & cpu_to_le32(LDF_COLLIDE);
1260
1261                 kunmap(pages[i]);
1262         }
1263         LASSERTF(lu_pgs == 0, "left = %d\n", lu_pgs);
1264 }
1265 #else
1266 #define mdc_adjust_dirpages(pages, cfs_pgs, lu_pgs) do {} while (0)
1267 #endif  /* PAGE_SIZE > LU_PAGE_SIZE */
1268
1269 /* parameters for readdir page */
1270 struct readpage_param {
1271         struct md_op_data       *rp_mod;
1272         __u64                   rp_off;
1273         int                     rp_hash64;
1274         struct obd_export       *rp_exp;
1275         struct md_callback      *rp_cb;
1276 };
1277
1278 #ifndef HAVE_DELETE_FROM_PAGE_CACHE
1279 static inline void delete_from_page_cache(struct page *page)
1280 {
1281         remove_from_page_cache(page);
1282         put_page(page);
1283 }
1284 #endif
1285
1286 /**
1287  * Read pages from server.
1288  *
1289  * Page in MDS_READPAGE RPC is packed in LU_PAGE_SIZE, and each page contains
1290  * a header lu_dirpage which describes the start/end hash, and whether this
1291  * page is empty (contains no dir entry) or hash collide with next page.
1292  * After client receives reply, several pages will be integrated into dir page
1293  * in PAGE_SIZE (if PAGE_SIZE greater than LU_PAGE_SIZE), and the
1294  * lu_dirpage for this integrated page will be adjusted.
1295  **/
1296 static int mdc_read_page_remote(void *data, struct page *page0)
1297 {
1298         struct readpage_param *rp = data;
1299         struct page **page_pool;
1300         struct page *page;
1301         struct lu_dirpage *dp;
1302         struct md_op_data *op_data = rp->rp_mod;
1303         struct ptlrpc_request *req;
1304         int max_pages;
1305         struct inode *inode;
1306         struct lu_fid *fid;
1307         int rd_pgs = 0; /* number of pages actually read */
1308         int npages;
1309         int i;
1310         int rc;
1311         ENTRY;
1312
1313         max_pages = rp->rp_exp->exp_obd->u.cli.cl_max_pages_per_rpc;
1314         inode = op_data->op_data;
1315         fid = &op_data->op_fid1;
1316         LASSERT(inode != NULL);
1317
1318         OBD_ALLOC(page_pool, sizeof(page_pool[0]) * max_pages);
1319         if (page_pool != NULL) {
1320                 page_pool[0] = page0;
1321         } else {
1322                 page_pool = &page0;
1323                 max_pages = 1;
1324         }
1325
1326         for (npages = 1; npages < max_pages; npages++) {
1327                 page = __page_cache_alloc(mapping_gfp_mask(inode->i_mapping)
1328                                           | __GFP_COLD);
1329                 if (page == NULL)
1330                         break;
1331                 page_pool[npages] = page;
1332         }
1333
1334         rc = mdc_getpage(rp->rp_exp, fid, rp->rp_off, page_pool, npages, &req);
1335         if (rc < 0) {
1336                 /* page0 is special, which was added into page cache early */
1337                 delete_from_page_cache(page0);
1338         } else {
1339                 int lu_pgs;
1340
1341                 rd_pgs = (req->rq_bulk->bd_nob_transferred + PAGE_SIZE - 1) >>
1342                         PAGE_SHIFT;
1343                 lu_pgs = req->rq_bulk->bd_nob_transferred >> LU_PAGE_SHIFT;
1344                 LASSERT(!(req->rq_bulk->bd_nob_transferred & ~LU_PAGE_MASK));
1345
1346                 CDEBUG(D_INODE, "read %d(%d) pages\n", rd_pgs, lu_pgs);
1347
1348                 mdc_adjust_dirpages(page_pool, rd_pgs, lu_pgs);
1349
1350                 SetPageUptodate(page0);
1351         }
1352         unlock_page(page0);
1353
1354         ptlrpc_req_finished(req);
1355         CDEBUG(D_CACHE, "read %d/%d pages\n", rd_pgs, npages);
1356         for (i = 1; i < npages; i++) {
1357                 unsigned long   offset;
1358                 __u64           hash;
1359                 int ret;
1360
1361                 page = page_pool[i];
1362
1363                 if (rc < 0 || i >= rd_pgs) {
1364                         put_page(page);
1365                         continue;
1366                 }
1367
1368                 SetPageUptodate(page);
1369
1370                 dp = kmap(page);
1371                 hash = le64_to_cpu(dp->ldp_hash_start);
1372                 kunmap(page);
1373
1374                 offset = hash_x_index(hash, rp->rp_hash64);
1375
1376                 prefetchw(&page->flags);
1377                 ret = add_to_page_cache_lru(page, inode->i_mapping, offset,
1378                                             GFP_KERNEL);
1379                 if (ret == 0)
1380                         unlock_page(page);
1381                 else
1382                         CDEBUG(D_VFSTRACE, "page %lu add to page cache failed:"
1383                                " rc = %d\n", offset, ret);
1384                 put_page(page);
1385         }
1386
1387         if (page_pool != &page0)
1388                 OBD_FREE(page_pool, sizeof(page_pool[0]) * max_pages);
1389
1390         RETURN(rc);
1391 }
1392
1393 /**
1394  * Read dir page from cache first, if it can not find it, read it from
1395  * server and add into the cache.
1396  *
1397  * \param[in] exp       MDC export
1398  * \param[in] op_data   client MD stack parameters, transfering parameters
1399  *                      between different layers on client MD stack.
1400  * \param[in] cb_op     callback required for ldlm lock enqueue during
1401  *                      read page
1402  * \param[in] hash_offset the hash offset of the page to be read
1403  * \param[in] ppage     the page to be read
1404  *
1405  * retval               = 0 get the page successfully
1406  *                      errno(<0) get the page failed
1407  */
1408 static int mdc_read_page(struct obd_export *exp, struct md_op_data *op_data,
1409                          struct md_callback *cb_op, __u64 hash_offset,
1410                          struct page **ppage)
1411 {
1412         struct lookup_intent    it = { .it_op = IT_READDIR };
1413         struct page             *page;
1414         struct inode            *dir = op_data->op_data;
1415         struct address_space    *mapping;
1416         struct lu_dirpage       *dp;
1417         __u64                   start = 0;
1418         __u64                   end = 0;
1419         struct lustre_handle    lockh;
1420         struct ptlrpc_request   *enq_req = NULL;
1421         struct readpage_param   rp_param;
1422         int rc;
1423
1424         ENTRY;
1425
1426         *ppage = NULL;
1427
1428         LASSERT(dir != NULL);
1429         mapping = dir->i_mapping;
1430
1431         rc = mdc_intent_lock(exp, op_data, &it, &enq_req,
1432                              cb_op->md_blocking_ast, 0);
1433         if (enq_req != NULL)
1434                 ptlrpc_req_finished(enq_req);
1435
1436         if (rc < 0) {
1437                 CERROR("%s: "DFID" lock enqueue fails: rc = %d\n",
1438                        exp->exp_obd->obd_name, PFID(&op_data->op_fid1), rc);
1439                 RETURN(rc);
1440         }
1441
1442         rc = 0;
1443         lockh.cookie = it.it_lock_handle;
1444         mdc_set_lock_data(exp, &lockh, dir, NULL);
1445
1446         rp_param.rp_off = hash_offset;
1447         rp_param.rp_hash64 = op_data->op_cli_flags & CLI_HASH64;
1448         page = mdc_page_locate(mapping, &rp_param.rp_off, &start, &end,
1449                                rp_param.rp_hash64);
1450         if (IS_ERR(page)) {
1451                 CERROR("%s: dir page locate: "DFID" at %llu: rc %ld\n",
1452                        exp->exp_obd->obd_name, PFID(&op_data->op_fid1),
1453                        rp_param.rp_off, PTR_ERR(page));
1454                 GOTO(out_unlock, rc = PTR_ERR(page));
1455         } else if (page != NULL) {
1456                 /*
1457                  * XXX nikita: not entirely correct handling of a corner case:
1458                  * suppose hash chain of entries with hash value HASH crosses
1459                  * border between pages P0 and P1. First both P0 and P1 are
1460                  * cached, seekdir() is called for some entry from the P0 part
1461                  * of the chain. Later P0 goes out of cache. telldir(HASH)
1462                  * happens and finds P1, as it starts with matching hash
1463                  * value. Remaining entries from P0 part of the chain are
1464                  * skipped. (Is that really a bug?)
1465                  *
1466                  * Possible solutions: 0. don't cache P1 is such case, handle
1467                  * it as an "overflow" page. 1. invalidate all pages at
1468                  * once. 2. use HASH|1 as an index for P1.
1469                  */
1470                 GOTO(hash_collision, page);
1471         }
1472
1473         rp_param.rp_exp = exp;
1474         rp_param.rp_mod = op_data;
1475         page = read_cache_page(mapping,
1476                                hash_x_index(rp_param.rp_off,
1477                                             rp_param.rp_hash64),
1478                                mdc_read_page_remote, &rp_param);
1479         if (IS_ERR(page)) {
1480                 CDEBUG(D_INFO, "%s: read cache page: "DFID" at %llu: %ld\n",
1481                        exp->exp_obd->obd_name, PFID(&op_data->op_fid1),
1482                        rp_param.rp_off, PTR_ERR(page));
1483                 GOTO(out_unlock, rc = PTR_ERR(page));
1484         }
1485
1486         wait_on_page_locked(page);
1487         (void)kmap(page);
1488         if (!PageUptodate(page)) {
1489                 CERROR("%s: page not updated: "DFID" at %llu: rc %d\n",
1490                        exp->exp_obd->obd_name, PFID(&op_data->op_fid1),
1491                        rp_param.rp_off, -5);
1492                 goto fail;
1493         }
1494         if (!PageChecked(page))
1495                 SetPageChecked(page);
1496         if (PageError(page)) {
1497                 CERROR("%s: page error: "DFID" at %llu: rc %d\n",
1498                        exp->exp_obd->obd_name, PFID(&op_data->op_fid1),
1499                        rp_param.rp_off, -5);
1500                 goto fail;
1501         }
1502
1503 hash_collision:
1504         dp = page_address(page);
1505         if (BITS_PER_LONG == 32 && rp_param.rp_hash64) {
1506                 start = le64_to_cpu(dp->ldp_hash_start) >> 32;
1507                 end   = le64_to_cpu(dp->ldp_hash_end) >> 32;
1508                 rp_param.rp_off = hash_offset >> 32;
1509         } else {
1510                 start = le64_to_cpu(dp->ldp_hash_start);
1511                 end   = le64_to_cpu(dp->ldp_hash_end);
1512                 rp_param.rp_off = hash_offset;
1513         }
1514         if (end == start) {
1515                 LASSERT(start == rp_param.rp_off);
1516                 CWARN("Page-wide hash collision: %#lx\n", (unsigned long)end);
1517 #if BITS_PER_LONG == 32
1518                 CWARN("Real page-wide hash collision at [%llu %llu] with "
1519                       "hash %llu\n", le64_to_cpu(dp->ldp_hash_start),
1520                       le64_to_cpu(dp->ldp_hash_end), hash_offset);
1521 #endif
1522
1523                 /*
1524                  * Fetch whole overflow chain...
1525                  *
1526                  * XXX not yet.
1527                  */
1528                 goto fail;
1529         }
1530         *ppage = page;
1531 out_unlock:
1532         ldlm_lock_decref(&lockh, it.it_lock_mode);
1533         return rc;
1534 fail:
1535         kunmap(page);
1536         mdc_release_page(page, 1);
1537         rc = -EIO;
1538         goto out_unlock;
1539 }
1540
1541 static int mdc_statfs(const struct lu_env *env,
1542                       struct obd_export *exp, struct obd_statfs *osfs,
1543                       time64_t max_age, __u32 flags)
1544 {
1545         struct obd_device *obd = class_exp2obd(exp);
1546         struct req_format *fmt;
1547         struct ptlrpc_request *req;
1548         struct obd_statfs *msfs;
1549         struct obd_import *imp = NULL;
1550         int rc;
1551         ENTRY;
1552
1553         /*
1554          * Since the request might also come from lprocfs, so we need
1555          * sync this with client_disconnect_export Bug15684
1556          */
1557         down_read(&obd->u.cli.cl_sem);
1558         if (obd->u.cli.cl_import)
1559                 imp = class_import_get(obd->u.cli.cl_import);
1560         up_read(&obd->u.cli.cl_sem);
1561         if (!imp)
1562                 RETURN(-ENODEV);
1563
1564         fmt = &RQF_MDS_STATFS;
1565         if ((exp_connect_flags2(exp) & OBD_CONNECT2_SUM_STATFS) &&
1566             (flags & OBD_STATFS_SUM))
1567                 fmt = &RQF_MDS_STATFS_NEW;
1568         req = ptlrpc_request_alloc_pack(imp, fmt, LUSTRE_MDS_VERSION,
1569                                         MDS_STATFS);
1570         if (req == NULL)
1571                 GOTO(output, rc = -ENOMEM);
1572
1573         if ((flags & OBD_STATFS_SUM) &&
1574             (exp_connect_flags2(exp) & OBD_CONNECT2_SUM_STATFS)) {
1575                 /* request aggregated states */
1576                 struct mdt_body *body;
1577
1578                 body = req_capsule_client_get(&req->rq_pill, &RMF_MDT_BODY);
1579                 if (body == NULL)
1580                         GOTO(out, rc = -EPROTO);
1581                 body->mbo_valid = OBD_MD_FLAGSTATFS;
1582         }
1583
1584         ptlrpc_request_set_replen(req);
1585
1586         if (flags & OBD_STATFS_NODELAY) {
1587                 /* procfs requests not want stay in wait for avoid deadlock */
1588                 req->rq_no_resend = 1;
1589                 req->rq_no_delay = 1;
1590         }
1591
1592         rc = ptlrpc_queue_wait(req);
1593         if (rc) {
1594                 /* check connection error first */
1595                 if (imp->imp_connect_error)
1596                         rc = imp->imp_connect_error;
1597                 GOTO(out, rc);
1598         }
1599
1600         msfs = req_capsule_server_get(&req->rq_pill, &RMF_OBD_STATFS);
1601         if (msfs == NULL)
1602                 GOTO(out, rc = -EPROTO);
1603
1604         *osfs = *msfs;
1605         EXIT;
1606 out:
1607         ptlrpc_req_finished(req);
1608 output:
1609         class_import_put(imp);
1610         return rc;
1611 }
1612
1613 static int mdc_ioc_fid2path(struct obd_export *exp, struct getinfo_fid2path *gf)
1614 {
1615         __u32 keylen, vallen;
1616         void *key;
1617         int rc;
1618
1619         if (gf->gf_pathlen > PATH_MAX)
1620                 RETURN(-ENAMETOOLONG);
1621         if (gf->gf_pathlen < 2)
1622                 RETURN(-EOVERFLOW);
1623
1624         /* Key is KEY_FID2PATH + getinfo_fid2path description */
1625         keylen = cfs_size_round(sizeof(KEY_FID2PATH) + sizeof(*gf) +
1626                                 sizeof(struct lu_fid));
1627         OBD_ALLOC(key, keylen);
1628         if (key == NULL)
1629                 RETURN(-ENOMEM);
1630         memcpy(key, KEY_FID2PATH, sizeof(KEY_FID2PATH));
1631         memcpy(key + cfs_size_round(sizeof(KEY_FID2PATH)), gf, sizeof(*gf));
1632         memcpy(key + cfs_size_round(sizeof(KEY_FID2PATH)) + sizeof(*gf),
1633                gf->gf_u.gf_root_fid, sizeof(struct lu_fid));
1634         CDEBUG(D_IOCTL, "path get "DFID" from %llu #%d\n",
1635                PFID(&gf->gf_fid), gf->gf_recno, gf->gf_linkno);
1636
1637         if (!fid_is_sane(&gf->gf_fid))
1638                 GOTO(out, rc = -EINVAL);
1639
1640         /* Val is struct getinfo_fid2path result plus path */
1641         vallen = sizeof(*gf) + gf->gf_pathlen;
1642
1643         rc = obd_get_info(NULL, exp, keylen, key, &vallen, gf);
1644         if (rc != 0 && rc != -EREMOTE)
1645                 GOTO(out, rc);
1646
1647         if (vallen <= sizeof(*gf))
1648                 GOTO(out, rc = -EPROTO);
1649         if (vallen > sizeof(*gf) + gf->gf_pathlen)
1650                 GOTO(out, rc = -EOVERFLOW);
1651
1652         CDEBUG(D_IOCTL, "path got "DFID" from %llu #%d: %s\n",
1653                PFID(&gf->gf_fid), gf->gf_recno, gf->gf_linkno,
1654                gf->gf_pathlen < 512 ? gf->gf_u.gf_path :
1655                /* only log the last 512 characters of the path */
1656                gf->gf_u.gf_path + gf->gf_pathlen - 512);
1657
1658 out:
1659         OBD_FREE(key, keylen);
1660         return rc;
1661 }
1662
1663 static int mdc_ioc_hsm_progress(struct obd_export *exp,
1664                                 struct hsm_progress_kernel *hpk)
1665 {
1666         struct obd_import               *imp = class_exp2cliimp(exp);
1667         struct hsm_progress_kernel      *req_hpk;
1668         struct ptlrpc_request           *req;
1669         int                              rc;
1670         ENTRY;
1671
1672         req = ptlrpc_request_alloc_pack(imp, &RQF_MDS_HSM_PROGRESS,
1673                                         LUSTRE_MDS_VERSION, MDS_HSM_PROGRESS);
1674         if (req == NULL)
1675                 GOTO(out, rc = -ENOMEM);
1676
1677         mdc_pack_body(req, NULL, 0, 0, -1, 0);
1678
1679         /* Copy hsm_progress struct */
1680         req_hpk = req_capsule_client_get(&req->rq_pill, &RMF_MDS_HSM_PROGRESS);
1681         if (req_hpk == NULL)
1682                 GOTO(out, rc = -EPROTO);
1683
1684         *req_hpk = *hpk;
1685         req_hpk->hpk_errval = lustre_errno_hton(hpk->hpk_errval);
1686
1687         ptlrpc_request_set_replen(req);
1688
1689         mdc_get_mod_rpc_slot(req, NULL);
1690         rc = ptlrpc_queue_wait(req);
1691         mdc_put_mod_rpc_slot(req, NULL);
1692
1693         GOTO(out, rc);
1694 out:
1695         ptlrpc_req_finished(req);
1696         return rc;
1697 }
1698 /**
1699  * Send hsm_ct_register to MDS
1700  *
1701  * \param[in]   imp             import
1702  * \param[in]   archive_count   if in bitmap format, it is the bitmap,
1703  *                              else it is the count of archive_ids
1704  * \param[in]   archives        if in bitmap format, it is NULL,
1705  *                              else it is archive_id lists
1706  */
1707 static int mdc_ioc_hsm_ct_register(struct obd_import *imp, __u32 archive_count,
1708                                    __u32 *archives)
1709 {
1710         struct ptlrpc_request *req;
1711         __u32 *archive_array;
1712         size_t archives_size;
1713         int rc;
1714         ENTRY;
1715
1716         req = ptlrpc_request_alloc(imp, &RQF_MDS_HSM_CT_REGISTER);
1717         if (req == NULL)
1718                 RETURN(-ENOMEM);
1719
1720         if (archives != NULL)
1721                 archives_size = sizeof(*archive_array) * archive_count;
1722         else
1723                 archives_size = sizeof(archive_count);
1724
1725         req_capsule_set_size(&req->rq_pill, &RMF_MDS_HSM_ARCHIVE,
1726                              RCL_CLIENT, archives_size);
1727
1728         rc = ptlrpc_request_pack(req, LUSTRE_MDS_VERSION, MDS_HSM_CT_REGISTER);
1729         if (rc) {
1730                 ptlrpc_request_free(req);
1731                 RETURN(-ENOMEM);
1732         }
1733
1734         mdc_pack_body(req, NULL, 0, 0, -1, 0);
1735
1736         archive_array = req_capsule_client_get(&req->rq_pill,
1737                                                &RMF_MDS_HSM_ARCHIVE);
1738         if (archive_array == NULL)
1739                 GOTO(out, rc = -EPROTO);
1740
1741         if (archives != NULL)
1742                 memcpy(archive_array, archives, archives_size);
1743         else
1744                 *archive_array = archive_count;
1745
1746         ptlrpc_request_set_replen(req);
1747
1748         rc = mdc_queue_wait(req);
1749         GOTO(out, rc);
1750 out:
1751         ptlrpc_req_finished(req);
1752         return rc;
1753 }
1754
1755 static int mdc_ioc_hsm_current_action(struct obd_export *exp,
1756                                       struct md_op_data *op_data)
1757 {
1758         struct hsm_current_action       *hca = op_data->op_data;
1759         struct hsm_current_action       *req_hca;
1760         struct ptlrpc_request           *req;
1761         int                              rc;
1762         ENTRY;
1763
1764         req = ptlrpc_request_alloc(class_exp2cliimp(exp),
1765                                    &RQF_MDS_HSM_ACTION);
1766         if (req == NULL)
1767                 RETURN(-ENOMEM);
1768
1769         rc = ptlrpc_request_pack(req, LUSTRE_MDS_VERSION, MDS_HSM_ACTION);
1770         if (rc) {
1771                 ptlrpc_request_free(req);
1772                 RETURN(rc);
1773         }
1774
1775         mdc_pack_body(req, &op_data->op_fid1, 0, 0,
1776                       op_data->op_suppgids[0], 0);
1777
1778         ptlrpc_request_set_replen(req);
1779
1780         rc = mdc_queue_wait(req);
1781         if (rc)
1782                 GOTO(out, rc);
1783
1784         req_hca = req_capsule_server_get(&req->rq_pill,
1785                                          &RMF_MDS_HSM_CURRENT_ACTION);
1786         if (req_hca == NULL)
1787                 GOTO(out, rc = -EPROTO);
1788
1789         *hca = *req_hca;
1790
1791         EXIT;
1792 out:
1793         ptlrpc_req_finished(req);
1794         return rc;
1795 }
1796
1797 static int mdc_ioc_hsm_ct_unregister(struct obd_import *imp)
1798 {
1799         struct ptlrpc_request   *req;
1800         int                      rc;
1801         ENTRY;
1802
1803         req = ptlrpc_request_alloc_pack(imp, &RQF_MDS_HSM_CT_UNREGISTER,
1804                                         LUSTRE_MDS_VERSION,
1805                                         MDS_HSM_CT_UNREGISTER);
1806         if (req == NULL)
1807                 GOTO(out, rc = -ENOMEM);
1808
1809         mdc_pack_body(req, NULL, 0, 0, -1, 0);
1810
1811         ptlrpc_request_set_replen(req);
1812
1813         rc = mdc_queue_wait(req);
1814         GOTO(out, rc);
1815 out:
1816         ptlrpc_req_finished(req);
1817         return rc;
1818 }
1819
1820 static int mdc_ioc_hsm_state_get(struct obd_export *exp,
1821                                  struct md_op_data *op_data)
1822 {
1823         struct hsm_user_state   *hus = op_data->op_data;
1824         struct hsm_user_state   *req_hus;
1825         struct ptlrpc_request   *req;
1826         int                      rc;
1827         ENTRY;
1828
1829         req = ptlrpc_request_alloc(class_exp2cliimp(exp),
1830                                    &RQF_MDS_HSM_STATE_GET);
1831         if (req == NULL)
1832                 RETURN(-ENOMEM);
1833
1834         rc = ptlrpc_request_pack(req, LUSTRE_MDS_VERSION, MDS_HSM_STATE_GET);
1835         if (rc != 0) {
1836                 ptlrpc_request_free(req);
1837                 RETURN(rc);
1838         }
1839
1840         mdc_pack_body(req, &op_data->op_fid1, 0, 0,
1841                       op_data->op_suppgids[0], 0);
1842
1843         ptlrpc_request_set_replen(req);
1844
1845         rc = mdc_queue_wait(req);
1846         if (rc)
1847                 GOTO(out, rc);
1848
1849         req_hus = req_capsule_server_get(&req->rq_pill, &RMF_HSM_USER_STATE);
1850         if (req_hus == NULL)
1851                 GOTO(out, rc = -EPROTO);
1852
1853         *hus = *req_hus;
1854
1855         EXIT;
1856 out:
1857         ptlrpc_req_finished(req);
1858         return rc;
1859 }
1860
1861 static int mdc_ioc_hsm_state_set(struct obd_export *exp,
1862                                  struct md_op_data *op_data)
1863 {
1864         struct hsm_state_set    *hss = op_data->op_data;
1865         struct hsm_state_set    *req_hss;
1866         struct ptlrpc_request   *req;
1867         int                      rc;
1868         ENTRY;
1869
1870         req = ptlrpc_request_alloc(class_exp2cliimp(exp),
1871                                    &RQF_MDS_HSM_STATE_SET);
1872         if (req == NULL)
1873                 RETURN(-ENOMEM);
1874
1875         rc = ptlrpc_request_pack(req, LUSTRE_MDS_VERSION, MDS_HSM_STATE_SET);
1876         if (rc) {
1877                 ptlrpc_request_free(req);
1878                 RETURN(rc);
1879         }
1880
1881         mdc_pack_body(req, &op_data->op_fid1, 0, 0,
1882                       op_data->op_suppgids[0], 0);
1883
1884         /* Copy states */
1885         req_hss = req_capsule_client_get(&req->rq_pill, &RMF_HSM_STATE_SET);
1886         if (req_hss == NULL)
1887                 GOTO(out, rc = -EPROTO);
1888         *req_hss = *hss;
1889
1890         ptlrpc_request_set_replen(req);
1891
1892         mdc_get_mod_rpc_slot(req, NULL);
1893         rc = ptlrpc_queue_wait(req);
1894         mdc_put_mod_rpc_slot(req, NULL);
1895
1896         GOTO(out, rc);
1897 out:
1898         ptlrpc_req_finished(req);
1899         return rc;
1900 }
1901
1902 static int mdc_ioc_hsm_request(struct obd_export *exp,
1903                                struct hsm_user_request *hur)
1904 {
1905         struct obd_import       *imp = class_exp2cliimp(exp);
1906         struct ptlrpc_request   *req;
1907         struct hsm_request      *req_hr;
1908         struct hsm_user_item    *req_hui;
1909         char                    *req_opaque;
1910         int                      rc;
1911         ENTRY;
1912
1913         req = ptlrpc_request_alloc(imp, &RQF_MDS_HSM_REQUEST);
1914         if (req == NULL)
1915                 GOTO(out, rc = -ENOMEM);
1916
1917         req_capsule_set_size(&req->rq_pill, &RMF_MDS_HSM_USER_ITEM, RCL_CLIENT,
1918                              hur->hur_request.hr_itemcount
1919                              * sizeof(struct hsm_user_item));
1920         req_capsule_set_size(&req->rq_pill, &RMF_GENERIC_DATA, RCL_CLIENT,
1921                              hur->hur_request.hr_data_len);
1922
1923         rc = ptlrpc_request_pack(req, LUSTRE_MDS_VERSION, MDS_HSM_REQUEST);
1924         if (rc) {
1925                 ptlrpc_request_free(req);
1926                 RETURN(rc);
1927         }
1928
1929         mdc_pack_body(req, NULL, 0, 0, -1, 0);
1930
1931         /* Copy hsm_request struct */
1932         req_hr = req_capsule_client_get(&req->rq_pill, &RMF_MDS_HSM_REQUEST);
1933         if (req_hr == NULL)
1934                 GOTO(out, rc = -EPROTO);
1935         *req_hr = hur->hur_request;
1936
1937         /* Copy hsm_user_item structs */
1938         req_hui = req_capsule_client_get(&req->rq_pill, &RMF_MDS_HSM_USER_ITEM);
1939         if (req_hui == NULL)
1940                 GOTO(out, rc = -EPROTO);
1941         memcpy(req_hui, hur->hur_user_item,
1942                hur->hur_request.hr_itemcount * sizeof(struct hsm_user_item));
1943
1944         /* Copy opaque field */
1945         req_opaque = req_capsule_client_get(&req->rq_pill, &RMF_GENERIC_DATA);
1946         if (req_opaque == NULL)
1947                 GOTO(out, rc = -EPROTO);
1948         memcpy(req_opaque, hur_data(hur), hur->hur_request.hr_data_len);
1949
1950         ptlrpc_request_set_replen(req);
1951
1952         mdc_get_mod_rpc_slot(req, NULL);
1953         rc = ptlrpc_queue_wait(req);
1954         mdc_put_mod_rpc_slot(req, NULL);
1955
1956         GOTO(out, rc);
1957
1958 out:
1959         ptlrpc_req_finished(req);
1960         return rc;
1961 }
1962
1963 static int mdc_ioc_hsm_ct_start(struct obd_export *exp,
1964                                 struct lustre_kernelcomm *lk);
1965
1966 static int mdc_quotactl(struct obd_device *unused, struct obd_export *exp,
1967                         struct obd_quotactl *oqctl)
1968 {
1969         struct ptlrpc_request   *req;
1970         struct obd_quotactl     *oqc;
1971         int                      rc;
1972         ENTRY;
1973
1974         req = ptlrpc_request_alloc_pack(class_exp2cliimp(exp),
1975                                         &RQF_MDS_QUOTACTL, LUSTRE_MDS_VERSION,
1976                                         MDS_QUOTACTL);
1977         if (req == NULL)
1978                 RETURN(-ENOMEM);
1979
1980         oqc = req_capsule_client_get(&req->rq_pill, &RMF_OBD_QUOTACTL);
1981         *oqc = *oqctl;
1982
1983         ptlrpc_request_set_replen(req);
1984         ptlrpc_at_set_req_timeout(req);
1985
1986         rc = ptlrpc_queue_wait(req);
1987         if (rc)
1988                 CERROR("ptlrpc_queue_wait failed, rc: %d\n", rc);
1989
1990         if (req->rq_repmsg &&
1991             (oqc = req_capsule_server_get(&req->rq_pill, &RMF_OBD_QUOTACTL))) {
1992                 *oqctl = *oqc;
1993         } else if (!rc) {
1994                 CERROR ("Can't unpack obd_quotactl\n");
1995                 rc = -EPROTO;
1996         }
1997         ptlrpc_req_finished(req);
1998
1999         RETURN(rc);
2000 }
2001
2002 static int mdc_ioc_swap_layouts(struct obd_export *exp,
2003                                 struct md_op_data *op_data)
2004 {
2005         struct list_head cancels = LIST_HEAD_INIT(cancels);
2006         struct ptlrpc_request   *req;
2007         int                      rc, count;
2008         struct mdc_swap_layouts *msl, *payload;
2009         ENTRY;
2010
2011         msl = op_data->op_data;
2012
2013         /* When the MDT will get the MDS_SWAP_LAYOUTS RPC the
2014          * first thing it will do is to cancel the 2 layout
2015          * locks held by this client.
2016          * So the client must cancel its layout locks on the 2 fids
2017          * with the request RPC to avoid extra RPC round trips.
2018          */
2019         count = mdc_resource_get_unused(exp, &op_data->op_fid1, &cancels,
2020                                         LCK_EX, MDS_INODELOCK_LAYOUT |
2021                                         MDS_INODELOCK_XATTR);
2022         count += mdc_resource_get_unused(exp, &op_data->op_fid2, &cancels,
2023                                          LCK_EX, MDS_INODELOCK_LAYOUT |
2024                                          MDS_INODELOCK_XATTR);
2025
2026         req = ptlrpc_request_alloc(class_exp2cliimp(exp),
2027                                    &RQF_MDS_SWAP_LAYOUTS);
2028         if (req == NULL) {
2029                 ldlm_lock_list_put(&cancels, l_bl_ast, count);
2030                 RETURN(-ENOMEM);
2031         }
2032
2033         rc = mdc_prep_elc_req(exp, req, MDS_SWAP_LAYOUTS, &cancels, count);
2034         if (rc) {
2035                 ptlrpc_request_free(req);
2036                 RETURN(rc);
2037         }
2038
2039         mdc_swap_layouts_pack(req, op_data);
2040
2041         payload = req_capsule_client_get(&req->rq_pill, &RMF_SWAP_LAYOUTS);
2042         LASSERT(payload);
2043
2044         *payload = *msl;
2045
2046         ptlrpc_request_set_replen(req);
2047
2048         rc = ptlrpc_queue_wait(req);
2049         if (rc)
2050                 GOTO(out, rc);
2051         EXIT;
2052
2053 out:
2054         ptlrpc_req_finished(req);
2055         return rc;
2056 }
2057
2058 static int mdc_iocontrol(unsigned int cmd, struct obd_export *exp, int len,
2059                          void *karg, void __user *uarg)
2060 {
2061         struct obd_device *obd = exp->exp_obd;
2062         struct obd_ioctl_data *data = karg;
2063         struct obd_import *imp = obd->u.cli.cl_import;
2064         int rc;
2065         ENTRY;
2066
2067         if (!try_module_get(THIS_MODULE)) {
2068                 CERROR("%s: cannot get module '%s'\n", obd->obd_name,
2069                        module_name(THIS_MODULE));
2070                 return -EINVAL;
2071         }
2072         switch (cmd) {
2073         case OBD_IOC_FID2PATH:
2074                 rc = mdc_ioc_fid2path(exp, karg);
2075                 GOTO(out, rc);
2076         case LL_IOC_HSM_CT_START:
2077                 rc = mdc_ioc_hsm_ct_start(exp, karg);
2078                 /* ignore if it was already registered on this MDS. */
2079                 if (rc == -EEXIST)
2080                         rc = 0;
2081                 GOTO(out, rc);
2082         case LL_IOC_HSM_PROGRESS:
2083                 rc = mdc_ioc_hsm_progress(exp, karg);
2084                 GOTO(out, rc);
2085         case LL_IOC_HSM_STATE_GET:
2086                 rc = mdc_ioc_hsm_state_get(exp, karg);
2087                 GOTO(out, rc);
2088         case LL_IOC_HSM_STATE_SET:
2089                 rc = mdc_ioc_hsm_state_set(exp, karg);
2090                 GOTO(out, rc);
2091         case LL_IOC_HSM_ACTION:
2092                 rc = mdc_ioc_hsm_current_action(exp, karg);
2093                 GOTO(out, rc);
2094         case LL_IOC_HSM_REQUEST:
2095                 rc = mdc_ioc_hsm_request(exp, karg);
2096                 GOTO(out, rc);
2097         case OBD_IOC_CLIENT_RECOVER:
2098                 rc = ptlrpc_recover_import(imp, data->ioc_inlbuf1, 0);
2099                 if (rc < 0)
2100                         GOTO(out, rc);
2101                 GOTO(out, rc = 0);
2102         case IOC_OSC_SET_ACTIVE:
2103                 rc = ptlrpc_set_import_active(imp, data->ioc_offset);
2104                 GOTO(out, rc);
2105         case OBD_IOC_PING_TARGET:
2106                 rc = ptlrpc_obd_ping(obd);
2107                 GOTO(out, rc);
2108         /*
2109          * Normally IOC_OBD_STATFS, OBD_IOC_QUOTACTL iocontrol are handled by
2110          * LMV instead of MDC. But when the cluster is upgraded from 1.8,
2111          * there'd be no LMV layer thus we might be called here. Eventually
2112          * this code should be removed.
2113          * bz20731, LU-592.
2114          */
2115         case IOC_OBD_STATFS: {
2116                 struct obd_statfs stat_buf = {0};
2117
2118                 if (*((__u32 *) data->ioc_inlbuf2) != 0)
2119                         GOTO(out, rc = -ENODEV);
2120
2121                 /* copy UUID */
2122                 if (copy_to_user(data->ioc_pbuf2, obd2cli_tgt(obd),
2123                                  min((int)data->ioc_plen2,
2124                                      (int)sizeof(struct obd_uuid))))
2125                         GOTO(out, rc = -EFAULT);
2126
2127                 rc = mdc_statfs(NULL, obd->obd_self_export, &stat_buf,
2128                                 ktime_get_seconds() - OBD_STATFS_CACHE_SECONDS,
2129                                 0);
2130                 if (rc != 0)
2131                         GOTO(out, rc);
2132
2133                 if (copy_to_user(data->ioc_pbuf1, &stat_buf,
2134                                      min((int) data->ioc_plen1,
2135                                          (int) sizeof(stat_buf))))
2136                         GOTO(out, rc = -EFAULT);
2137
2138                 GOTO(out, rc = 0);
2139         }
2140         case OBD_IOC_QUOTACTL: {
2141                 struct if_quotactl *qctl = karg;
2142                 struct obd_quotactl *oqctl;
2143
2144                 OBD_ALLOC_PTR(oqctl);
2145                 if (oqctl == NULL)
2146                         GOTO(out, rc = -ENOMEM);
2147
2148                 QCTL_COPY(oqctl, qctl);
2149                 rc = obd_quotactl(exp, oqctl);
2150                 if (rc == 0) {
2151                         QCTL_COPY(qctl, oqctl);
2152                         qctl->qc_valid = QC_MDTIDX;
2153                         qctl->obd_uuid = obd->u.cli.cl_target_uuid;
2154                 }
2155
2156                 OBD_FREE_PTR(oqctl);
2157                 GOTO(out, rc);
2158         }
2159         case LL_IOC_GET_CONNECT_FLAGS:
2160                 if (copy_to_user(uarg, exp_connect_flags_ptr(exp),
2161                                  sizeof(*exp_connect_flags_ptr(exp))))
2162                         GOTO(out, rc = -EFAULT);
2163
2164                 GOTO(out, rc = 0);
2165         case LL_IOC_LOV_SWAP_LAYOUTS:
2166                 rc = mdc_ioc_swap_layouts(exp, karg);
2167                 GOTO(out, rc);
2168         default:
2169                 CERROR("unrecognised ioctl: cmd = %#x\n", cmd);
2170                 GOTO(out, rc = -ENOTTY);
2171         }
2172 out:
2173         module_put(THIS_MODULE);
2174
2175         return rc;
2176 }
2177
2178 static int mdc_get_info_rpc(struct obd_export *exp,
2179                             u32 keylen, void *key,
2180                             u32 vallen, void *val)
2181 {
2182         struct obd_import      *imp = class_exp2cliimp(exp);
2183         struct ptlrpc_request  *req;
2184         char                   *tmp;
2185         int                     rc = -EINVAL;
2186         ENTRY;
2187
2188         req = ptlrpc_request_alloc(imp, &RQF_MDS_GET_INFO);
2189         if (req == NULL)
2190                 RETURN(-ENOMEM);
2191
2192         req_capsule_set_size(&req->rq_pill, &RMF_GETINFO_KEY,
2193                              RCL_CLIENT, keylen);
2194         req_capsule_set_size(&req->rq_pill, &RMF_GETINFO_VALLEN,
2195                              RCL_CLIENT, sizeof(vallen));
2196
2197         rc = ptlrpc_request_pack(req, LUSTRE_MDS_VERSION, MDS_GET_INFO);
2198         if (rc) {
2199                 ptlrpc_request_free(req);
2200                 RETURN(rc);
2201         }
2202
2203         tmp = req_capsule_client_get(&req->rq_pill, &RMF_GETINFO_KEY);
2204         memcpy(tmp, key, keylen);
2205         tmp = req_capsule_client_get(&req->rq_pill, &RMF_GETINFO_VALLEN);
2206         memcpy(tmp, &vallen, sizeof(vallen));
2207
2208         req_capsule_set_size(&req->rq_pill, &RMF_GETINFO_VAL,
2209                              RCL_SERVER, vallen);
2210         ptlrpc_request_set_replen(req);
2211
2212         rc = ptlrpc_queue_wait(req);
2213         /* -EREMOTE means the get_info result is partial, and it needs to
2214          * continue on another MDT, see fid2path part in lmv_iocontrol */
2215         if (rc == 0 || rc == -EREMOTE) {
2216                 tmp = req_capsule_server_get(&req->rq_pill, &RMF_GETINFO_VAL);
2217                 memcpy(val, tmp, vallen);
2218                 if (ptlrpc_rep_need_swab(req)) {
2219                         if (KEY_IS(KEY_FID2PATH))
2220                                 lustre_swab_fid2path(val);
2221                 }
2222         }
2223         ptlrpc_req_finished(req);
2224
2225         RETURN(rc);
2226 }
2227
2228 static void lustre_swab_hai(struct hsm_action_item *h)
2229 {
2230         __swab32s(&h->hai_len);
2231         __swab32s(&h->hai_action);
2232         lustre_swab_lu_fid(&h->hai_fid);
2233         lustre_swab_lu_fid(&h->hai_dfid);
2234         __swab64s(&h->hai_cookie);
2235         __swab64s(&h->hai_extent.offset);
2236         __swab64s(&h->hai_extent.length);
2237         __swab64s(&h->hai_gid);
2238 }
2239
2240 static void lustre_swab_hal(struct hsm_action_list *h)
2241 {
2242         struct hsm_action_item  *hai;
2243         __u32                    i;
2244
2245         __swab32s(&h->hal_version);
2246         __swab32s(&h->hal_count);
2247         __swab32s(&h->hal_archive_id);
2248         __swab64s(&h->hal_flags);
2249         hai = hai_first(h);
2250         for (i = 0; i < h->hal_count; i++, hai = hai_next(hai))
2251                 lustre_swab_hai(hai);
2252 }
2253
2254 static void lustre_swab_kuch(struct kuc_hdr *l)
2255 {
2256         __swab16s(&l->kuc_magic);
2257         /* __u8 l->kuc_transport */
2258         __swab16s(&l->kuc_msgtype);
2259         __swab16s(&l->kuc_msglen);
2260 }
2261
2262 static int mdc_ioc_hsm_ct_start(struct obd_export *exp,
2263                                 struct lustre_kernelcomm *lk)
2264 {
2265         struct obd_import *imp = class_exp2cliimp(exp);
2266         int rc = 0;
2267
2268         if (lk->lk_group != KUC_GRP_HSM) {
2269                 CERROR("Bad copytool group %d\n", lk->lk_group);
2270                 return -EINVAL;
2271         }
2272
2273         CDEBUG(D_HSM, "CT start r%d w%d u%d g%d f%#x\n", lk->lk_rfd, lk->lk_wfd,
2274                lk->lk_uid, lk->lk_group, lk->lk_flags);
2275
2276         if (lk->lk_flags & LK_FLG_STOP) {
2277                 /* Unregister with the coordinator */
2278                 rc = mdc_ioc_hsm_ct_unregister(imp);
2279         } else {
2280                 __u32 *archives = NULL;
2281
2282                 if ((lk->lk_flags & LK_FLG_DATANR) && lk->lk_data_count > 0)
2283                         archives = lk->lk_data;
2284
2285                 rc = mdc_ioc_hsm_ct_register(imp, lk->lk_data_count, archives);
2286         }
2287
2288         return rc;
2289 }
2290
2291 /**
2292  * Send a message to any listening copytools
2293  * @param val KUC message (kuc_hdr + hsm_action_list)
2294  * @param len total length of message
2295  */
2296 static int mdc_hsm_copytool_send(const struct obd_uuid *uuid,
2297                                  size_t len, void *val)
2298 {
2299         struct kuc_hdr          *lh = (struct kuc_hdr *)val;
2300         struct hsm_action_list  *hal = (struct hsm_action_list *)(lh + 1);
2301         int                      rc;
2302         ENTRY;
2303
2304         if (len < sizeof(*lh) + sizeof(*hal)) {
2305                 CERROR("Short HSM message %zu < %zu\n", len,
2306                        sizeof(*lh) + sizeof(*hal));
2307                 RETURN(-EPROTO);
2308         }
2309         if (lh->kuc_magic == __swab16(KUC_MAGIC)) {
2310                 lustre_swab_kuch(lh);
2311                 lustre_swab_hal(hal);
2312         } else if (lh->kuc_magic != KUC_MAGIC) {
2313                 CERROR("Bad magic %x!=%x\n", lh->kuc_magic, KUC_MAGIC);
2314                 RETURN(-EPROTO);
2315         }
2316
2317         CDEBUG(D_HSM, " Received message mg=%x t=%d m=%d l=%d actions=%d "
2318                "on %s\n",
2319                lh->kuc_magic, lh->kuc_transport, lh->kuc_msgtype,
2320                lh->kuc_msglen, hal->hal_count, hal->hal_fsname);
2321
2322         /* Broadcast to HSM listeners */
2323         rc = libcfs_kkuc_group_put(uuid, KUC_GRP_HSM, lh);
2324
2325         RETURN(rc);
2326 }
2327
2328 /**
2329  * callback function passed to kuc for re-registering each HSM copytool
2330  * running on MDC, after MDT shutdown/recovery.
2331  * @param data copytool registration data
2332  * @param cb_arg callback argument (obd_import)
2333  */
2334 static int mdc_hsm_ct_reregister(void *data, void *cb_arg)
2335 {
2336         struct obd_import *imp = (struct obd_import *)cb_arg;
2337         struct kkuc_ct_data *kcd = data;
2338         __u32 *archives = NULL;
2339         int rc;
2340
2341         if (kcd == NULL ||
2342             (kcd->kcd_magic != KKUC_CT_DATA_ARRAY_MAGIC &&
2343              kcd->kcd_magic != KKUC_CT_DATA_BITMAP_MAGIC))
2344                 return -EPROTO;
2345
2346         if (kcd->kcd_magic == KKUC_CT_DATA_BITMAP_MAGIC) {
2347                 CDEBUG(D_HA, "%s: recover copytool registration to MDT "
2348                        "(archive=%#x)\n", imp->imp_obd->obd_name,
2349                        kcd->kcd_nr_archives);
2350         } else {
2351                 CDEBUG(D_HA, "%s: recover copytool registration to MDT "
2352                        "(archive nr = %u)\n",
2353                        imp->imp_obd->obd_name, kcd->kcd_nr_archives);
2354                 if (kcd->kcd_nr_archives != 0)
2355                         archives = kcd->kcd_archives;
2356         }
2357
2358         rc = mdc_ioc_hsm_ct_register(imp, kcd->kcd_nr_archives, archives);
2359         /* ignore error if the copytool is already registered */
2360         return (rc == -EEXIST) ? 0 : rc;
2361 }
2362
2363 /**
2364  * Re-establish all kuc contexts with MDT
2365  * after MDT shutdown/recovery.
2366  */
2367 static int mdc_kuc_reregister(struct obd_import *imp)
2368 {
2369         /* re-register HSM agents */
2370         return libcfs_kkuc_group_foreach(&imp->imp_obd->obd_uuid, KUC_GRP_HSM,
2371                                          mdc_hsm_ct_reregister, imp);
2372 }
2373
2374 static int mdc_set_info_async(const struct lu_env *env,
2375                               struct obd_export *exp,
2376                               u32 keylen, void *key,
2377                               u32 vallen, void *val,
2378                               struct ptlrpc_request_set *set)
2379 {
2380         struct obd_import       *imp = class_exp2cliimp(exp);
2381         int                      rc;
2382         ENTRY;
2383
2384         if (KEY_IS(KEY_READ_ONLY)) {
2385                 if (vallen != sizeof(int))
2386                         RETURN(-EINVAL);
2387
2388                 spin_lock(&imp->imp_lock);
2389                 if (*((int *)val)) {
2390                         imp->imp_connect_flags_orig |= OBD_CONNECT_RDONLY;
2391                         imp->imp_connect_data.ocd_connect_flags |=
2392                                                         OBD_CONNECT_RDONLY;
2393                 } else {
2394                         imp->imp_connect_flags_orig &= ~OBD_CONNECT_RDONLY;
2395                         imp->imp_connect_data.ocd_connect_flags &=
2396                                                         ~OBD_CONNECT_RDONLY;
2397                 }
2398                 spin_unlock(&imp->imp_lock);
2399
2400                 rc = do_set_info_async(imp, MDS_SET_INFO, LUSTRE_MDS_VERSION,
2401                                        keylen, key, vallen, val, set);
2402                 RETURN(rc);
2403         }
2404         if (KEY_IS(KEY_CHANGELOG_CLEAR)) {
2405                 rc = do_set_info_async(imp, MDS_SET_INFO, LUSTRE_MDS_VERSION,
2406                                        keylen, key, vallen, val, set);
2407                 RETURN(rc);
2408         }
2409         if (KEY_IS(KEY_HSM_COPYTOOL_SEND)) {
2410                 rc = mdc_hsm_copytool_send(&imp->imp_obd->obd_uuid, vallen,
2411                                            val);
2412                 RETURN(rc);
2413         }
2414
2415         if (KEY_IS(KEY_DEFAULT_EASIZE)) {
2416                 __u32 *default_easize = val;
2417
2418                 exp->exp_obd->u.cli.cl_default_mds_easize = *default_easize;
2419                 RETURN(0);
2420         }
2421
2422         rc = osc_set_info_async(env, exp, keylen, key, vallen, val, set);
2423         RETURN(rc);
2424 }
2425
2426 static int mdc_get_info(const struct lu_env *env, struct obd_export *exp,
2427                         __u32 keylen, void *key, __u32 *vallen, void *val)
2428 {
2429         int rc = -EINVAL;
2430
2431         if (KEY_IS(KEY_MAX_EASIZE)) {
2432                 __u32 mdsize, *max_easize;
2433
2434                 if (*vallen != sizeof(int))
2435                         RETURN(-EINVAL);
2436                 mdsize = *(__u32 *)val;
2437                 if (mdsize > exp->exp_obd->u.cli.cl_max_mds_easize)
2438                         exp->exp_obd->u.cli.cl_max_mds_easize = mdsize;
2439                 max_easize = val;
2440                 *max_easize = exp->exp_obd->u.cli.cl_max_mds_easize;
2441                 RETURN(0);
2442         } else if (KEY_IS(KEY_DEFAULT_EASIZE)) {
2443                 __u32 *default_easize;
2444
2445                 if (*vallen != sizeof(int))
2446                         RETURN(-EINVAL);
2447                 default_easize = val;
2448                 *default_easize = exp->exp_obd->u.cli.cl_default_mds_easize;
2449                 RETURN(0);
2450         } else if (KEY_IS(KEY_CONN_DATA)) {
2451                 struct obd_import *imp = class_exp2cliimp(exp);
2452                 struct obd_connect_data *data = val;
2453
2454                 if (*vallen != sizeof(*data))
2455                         RETURN(-EINVAL);
2456
2457                 *data = imp->imp_connect_data;
2458                 RETURN(0);
2459         } else if (KEY_IS(KEY_TGT_COUNT)) {
2460                 *((__u32 *)val) = 1;
2461                 RETURN(0);
2462         }
2463
2464         rc = mdc_get_info_rpc(exp, keylen, key, *vallen, val);
2465
2466         RETURN(rc);
2467 }
2468
2469 static int mdc_fsync(struct obd_export *exp, const struct lu_fid *fid,
2470                      struct ptlrpc_request **request)
2471 {
2472         struct ptlrpc_request *req;
2473         int                    rc;
2474         ENTRY;
2475
2476         *request = NULL;
2477         req = ptlrpc_request_alloc(class_exp2cliimp(exp), &RQF_MDS_SYNC);
2478         if (req == NULL)
2479                 RETURN(-ENOMEM);
2480
2481         rc = ptlrpc_request_pack(req, LUSTRE_MDS_VERSION, MDS_SYNC);
2482         if (rc) {
2483                 ptlrpc_request_free(req);
2484                 RETURN(rc);
2485         }
2486
2487         mdc_pack_body(req, fid, 0, 0, -1, 0);
2488
2489         ptlrpc_request_set_replen(req);
2490
2491         rc = ptlrpc_queue_wait(req);
2492         if (rc)
2493                 ptlrpc_req_finished(req);
2494         else
2495                 *request = req;
2496         RETURN(rc);
2497 }
2498
2499 static int mdc_import_event(struct obd_device *obd, struct obd_import *imp,
2500                             enum obd_import_event event)
2501 {
2502         struct client_obd *cli = &obd->u.cli;
2503         int rc = 0;
2504
2505         LASSERT(imp->imp_obd == obd);
2506
2507         switch (event) {
2508         case IMP_EVENT_DISCON:
2509                 spin_lock(&cli->cl_loi_list_lock);
2510                 cli->cl_avail_grant = 0;
2511                 cli->cl_lost_grant = 0;
2512                 spin_unlock(&cli->cl_loi_list_lock);
2513                 break;
2514         case IMP_EVENT_INACTIVE:
2515                 /*
2516                  * Flush current sequence to make client obtain new one
2517                  * from server in case of disconnect/reconnect.
2518                  */
2519                 down_read(&cli->cl_seq_rwsem);
2520                 if (cli->cl_seq)
2521                         seq_client_flush(cli->cl_seq);
2522                 up_read(&cli->cl_seq_rwsem);
2523
2524                 rc = obd_notify_observer(obd, obd, OBD_NOTIFY_INACTIVE);
2525                 break;
2526         case IMP_EVENT_INVALIDATE: {
2527                 struct ldlm_namespace *ns = obd->obd_namespace;
2528                 struct lu_env *env;
2529                 __u16 refcheck;
2530
2531                 ldlm_namespace_cleanup(ns, LDLM_FL_LOCAL_ONLY);
2532
2533                 env = cl_env_get(&refcheck);
2534                 if (!IS_ERR(env)) {
2535                         /* Reset grants. All pages go to failing rpcs due to
2536                          * the invalid import.
2537                          */
2538                         osc_io_unplug(env, cli, NULL);
2539
2540                         cfs_hash_for_each_nolock(ns->ns_rs_hash,
2541                                                  osc_ldlm_resource_invalidate,
2542                                                  env, 0);
2543                         cl_env_put(env, &refcheck);
2544                         ldlm_namespace_cleanup(ns, LDLM_FL_LOCAL_ONLY);
2545                 } else {
2546                         rc = PTR_ERR(env);
2547                 }
2548                 break;
2549         }
2550         case IMP_EVENT_ACTIVE:
2551                 rc = obd_notify_observer(obd, obd, OBD_NOTIFY_ACTIVE);
2552                 /* redo the kuc registration after reconnecting */
2553                 if (rc == 0)
2554                         rc = mdc_kuc_reregister(imp);
2555                 break;
2556         case IMP_EVENT_OCD: {
2557                 struct obd_connect_data *ocd = &imp->imp_connect_data;
2558
2559                 if (OCD_HAS_FLAG(ocd, GRANT))
2560                         osc_init_grant(cli, ocd);
2561
2562                 rc = obd_notify_observer(obd, obd, OBD_NOTIFY_OCD);
2563                 break;
2564         }
2565         case IMP_EVENT_DEACTIVATE:
2566         case IMP_EVENT_ACTIVATE:
2567                 break;
2568         default:
2569                 CERROR("Unknown import event %x\n", event);
2570                 LBUG();
2571         }
2572         RETURN(rc);
2573 }
2574
2575 int mdc_fid_alloc(const struct lu_env *env, struct obd_export *exp,
2576                   struct lu_fid *fid, struct md_op_data *op_data)
2577 {
2578         struct client_obd *cli = &exp->exp_obd->u.cli;
2579         int rc = -EIO;
2580
2581         ENTRY;
2582
2583         down_read(&cli->cl_seq_rwsem);
2584         if (cli->cl_seq)
2585                 rc = seq_client_alloc_fid(env, cli->cl_seq, fid);
2586         up_read(&cli->cl_seq_rwsem);
2587
2588         RETURN(rc);
2589 }
2590
2591 static struct obd_uuid *mdc_get_uuid(struct obd_export *exp)
2592 {
2593         struct client_obd *cli = &exp->exp_obd->u.cli;
2594         return &cli->cl_target_uuid;
2595 }
2596
2597 /**
2598  * Determine whether the lock can be canceled before replaying it during
2599  * recovery, non zero value will be return if the lock can be canceled,
2600  * or zero returned for not
2601  */
2602 static int mdc_cancel_weight(struct ldlm_lock *lock)
2603 {
2604         if (lock->l_resource->lr_type != LDLM_IBITS)
2605                 RETURN(0);
2606
2607         /* FIXME: if we ever get into a situation where there are too many
2608          * opened files with open locks on a single node, then we really
2609          * should replay these open locks to reget it */
2610         if (lock->l_policy_data.l_inodebits.bits & MDS_INODELOCK_OPEN)
2611                 RETURN(0);
2612
2613         /* Special case for DoM locks, cancel only unused and granted locks */
2614         if (ldlm_has_dom(lock) &&
2615             (lock->l_granted_mode != lock->l_req_mode ||
2616              osc_ldlm_weigh_ast(lock) != 0))
2617                 RETURN(0);
2618
2619         RETURN(1);
2620 }
2621
2622 static int mdc_resource_inode_free(struct ldlm_resource *res)
2623 {
2624         if (res->lr_lvb_inode)
2625                 res->lr_lvb_inode = NULL;
2626
2627         return 0;
2628 }
2629
2630 static struct ldlm_valblock_ops inode_lvbo = {
2631         .lvbo_free = mdc_resource_inode_free
2632 };
2633
2634 static int mdc_llog_init(struct obd_device *obd)
2635 {
2636         struct obd_llog_group   *olg = &obd->obd_olg;
2637         struct llog_ctxt        *ctxt;
2638         int                      rc;
2639
2640         ENTRY;
2641
2642         rc = llog_setup(NULL, obd, olg, LLOG_CHANGELOG_REPL_CTXT, obd,
2643                         &llog_client_ops);
2644         if (rc < 0)
2645                 RETURN(rc);
2646
2647         ctxt = llog_group_get_ctxt(olg, LLOG_CHANGELOG_REPL_CTXT);
2648         llog_initiator_connect(ctxt);
2649         llog_ctxt_put(ctxt);
2650
2651         RETURN(0);
2652 }
2653
2654 static void mdc_llog_finish(struct obd_device *obd)
2655 {
2656         struct llog_ctxt *ctxt;
2657
2658         ENTRY;
2659
2660         ctxt = llog_get_context(obd, LLOG_CHANGELOG_REPL_CTXT);
2661         if (ctxt != NULL)
2662                 llog_cleanup(NULL, ctxt);
2663
2664         EXIT;
2665 }
2666
2667 int mdc_setup(struct obd_device *obd, struct lustre_cfg *cfg)
2668 {
2669         int rc;
2670
2671         ENTRY;
2672
2673         rc = osc_setup_common(obd, cfg);
2674         if (rc < 0)
2675                 RETURN(rc);
2676
2677         rc = mdc_tunables_init(obd);
2678         if (rc)
2679                 GOTO(err_osc_cleanup, rc);
2680
2681         obd->u.cli.cl_dom_min_inline_repsize = MDC_DOM_DEF_INLINE_REPSIZE;
2682
2683         ns_register_cancel(obd->obd_namespace, mdc_cancel_weight);
2684
2685         obd->obd_namespace->ns_lvbo = &inode_lvbo;
2686
2687         rc = mdc_llog_init(obd);
2688         if (rc) {
2689                 CERROR("%s: failed to setup llogging subsystems: rc = %d\n",
2690                        obd->obd_name, rc);
2691                 GOTO(err_llog_cleanup, rc);
2692         }
2693
2694         rc = mdc_changelog_cdev_init(obd);
2695         if (rc) {
2696                 CERROR("%s: failed to setup changelog char device: rc = %d\n",
2697                        obd->obd_name, rc);
2698                 GOTO(err_changelog_cleanup, rc);
2699         }
2700
2701         RETURN(rc);
2702
2703 err_changelog_cleanup:
2704         mdc_llog_finish(obd);
2705 err_llog_cleanup:
2706         lprocfs_free_md_stats(obd);
2707         ptlrpc_lprocfs_unregister_obd(obd);
2708 err_osc_cleanup:
2709         osc_cleanup_common(obd);
2710         return rc;
2711 }
2712
2713 /* Initialize the default and maximum LOV EA sizes.  This allows
2714  * us to make MDS RPCs with large enough reply buffers to hold a default
2715  * sized EA without having to calculate this (via a call into the
2716  * LOV + OSCs) each time we make an RPC.  The maximum size is also tracked
2717  * but not used to avoid wastefully vmalloc()'ing large reply buffers when
2718  * a large number of stripes is possible.  If a larger reply buffer is
2719  * required it will be reallocated in the ptlrpc layer due to overflow.
2720  */
2721 static int mdc_init_ea_size(struct obd_export *exp, __u32 easize,
2722                             __u32 def_easize)
2723 {
2724         struct obd_device *obd = exp->exp_obd;
2725         struct client_obd *cli = &obd->u.cli;
2726         ENTRY;
2727
2728         if (cli->cl_max_mds_easize < easize)
2729                 cli->cl_max_mds_easize = easize;
2730
2731         if (cli->cl_default_mds_easize < def_easize)
2732                 cli->cl_default_mds_easize = def_easize;
2733
2734         RETURN(0);
2735 }
2736
2737 static int mdc_precleanup(struct obd_device *obd)
2738 {
2739         ENTRY;
2740
2741         osc_precleanup_common(obd);
2742         mdc_changelog_cdev_finish(obd);
2743
2744         obd_cleanup_client_import(obd);
2745         ptlrpc_lprocfs_unregister_obd(obd);
2746         lprocfs_free_md_stats(obd);
2747         mdc_llog_finish(obd);
2748         RETURN(0);
2749 }
2750
2751 static int mdc_cleanup(struct obd_device *obd)
2752 {
2753         return osc_cleanup_common(obd);
2754 }
2755
2756 int mdc_process_config(struct obd_device *obd, size_t len, void *buf)
2757 {
2758         struct lustre_cfg *lcfg = buf;
2759         size_t count  = class_modify_config(lcfg, PARAM_MDC,
2760                                             &obd->obd_kset.kobj);
2761
2762         return count > 0 ? 0 : count;
2763 }
2764
2765 static struct obd_ops mdc_obd_ops = {
2766         .o_owner            = THIS_MODULE,
2767         .o_setup            = mdc_setup,
2768         .o_precleanup       = mdc_precleanup,
2769         .o_cleanup          = mdc_cleanup,
2770         .o_add_conn         = client_import_add_conn,
2771         .o_del_conn         = client_import_del_conn,
2772         .o_connect          = client_connect_import,
2773         .o_reconnect        = osc_reconnect,
2774         .o_disconnect       = osc_disconnect,
2775         .o_iocontrol        = mdc_iocontrol,
2776         .o_set_info_async   = mdc_set_info_async,
2777         .o_statfs           = mdc_statfs,
2778         .o_fid_init         = client_fid_init,
2779         .o_fid_fini         = client_fid_fini,
2780         .o_fid_alloc        = mdc_fid_alloc,
2781         .o_import_event     = mdc_import_event,
2782         .o_get_info         = mdc_get_info,
2783         .o_process_config   = mdc_process_config,
2784         .o_get_uuid         = mdc_get_uuid,
2785         .o_quotactl         = mdc_quotactl,
2786 };
2787
2788 static struct md_ops mdc_md_ops = {
2789         .m_get_root         = mdc_get_root,
2790         .m_null_inode       = mdc_null_inode,
2791         .m_close            = mdc_close,
2792         .m_create           = mdc_create,
2793         .m_enqueue          = mdc_enqueue,
2794         .m_getattr          = mdc_getattr,
2795         .m_getattr_name     = mdc_getattr_name,
2796         .m_intent_lock      = mdc_intent_lock,
2797         .m_link             = mdc_link,
2798         .m_rename           = mdc_rename,
2799         .m_setattr          = mdc_setattr,
2800         .m_setxattr         = mdc_setxattr,
2801         .m_getxattr         = mdc_getxattr,
2802         .m_fsync                = mdc_fsync,
2803         .m_file_resync          = mdc_file_resync,
2804         .m_read_page            = mdc_read_page,
2805         .m_unlink           = mdc_unlink,
2806         .m_cancel_unused    = mdc_cancel_unused,
2807         .m_init_ea_size     = mdc_init_ea_size,
2808         .m_set_lock_data    = mdc_set_lock_data,
2809         .m_lock_match       = mdc_lock_match,
2810         .m_get_lustre_md    = mdc_get_lustre_md,
2811         .m_free_lustre_md   = mdc_free_lustre_md,
2812         .m_set_open_replay_data = mdc_set_open_replay_data,
2813         .m_clear_open_replay_data = mdc_clear_open_replay_data,
2814         .m_intent_getattr_async = mdc_intent_getattr_async,
2815         .m_revalidate_lock      = mdc_revalidate_lock
2816 };
2817
2818 static int __init mdc_init(void)
2819 {
2820         return class_register_type(&mdc_obd_ops, &mdc_md_ops, true, NULL,
2821                                    LUSTRE_MDC_NAME, &mdc_device_type);
2822 }
2823
2824 static void __exit mdc_exit(void)
2825 {
2826         class_unregister_type(LUSTRE_MDC_NAME);
2827 }
2828
2829 MODULE_AUTHOR("OpenSFS, Inc. <http://www.lustre.org/>");
2830 MODULE_DESCRIPTION("Lustre Metadata Client");
2831 MODULE_VERSION(LUSTRE_VERSION_STRING);
2832 MODULE_LICENSE("GPL");
2833
2834 module_init(mdc_init);
2835 module_exit(mdc_exit);