lustre/mdc/mdc_request.c

   1
   2
   3 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
   4  * vim:expandtab:shiftwidth=8:tabstop=8:
   5  *
   6  * Copyright (C) 2001, 2002 Cluster File Systems, Inc.
   7  *
   8  *   This file is part of Lustre, http://www.sf.net/projects/lustre/
   9  *
  10  *   Lustre is free software; you can redistribute it and/or
  11  *   modify it under the terms of version 2 of the GNU General Public
  12  *   License as published by the Free Software Foundation.
  13  *
  14  *   Lustre is distributed in the hope that it will be useful,
  15  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  *   GNU General Public License for more details.
  18  *
  19  *   You should have received a copy of the GNU General Public License
  20  *   along with Lustre; if not, write to the Free Software
  21  *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  22  *
  23  */
  24
  25 #define EXPORT_SYMTAB
  26 #define DEBUG_SUBSYSTEM S_MDC
  27
  28 #include <linux/module.h>
  29 #include <linux/miscdevice.h>
  30 #include <linux/lustre_mds.h>
  31 #include <linux/lustre_lite.h>
  32 #include <linux/lustre_dlm.h>
  33 #include <linux/init.h>
  34 #include <linux/obd_lov.h>
  35 #include <linux/lprocfs_status.h>
  36
  37 #define REQUEST_MINOR 244
  38
  39 extern int mds_queue_req(struct ptlrpc_request *);
  40 extern struct lprocfs_vars status_var_nm_1[];
  41 extern struct lprocfs_vars status_class_var[];
  42
  43 /* should become mdc_getinfo() */
  44 int mdc_getstatus(struct lustre_handle *conn, struct ll_fid *rootfid)
  45 {
  46         struct ptlrpc_request *req;
  47         struct mds_body *body;
  48         int rc, size = sizeof(*body);
  49         ENTRY;
  50
  51         req = ptlrpc_prep_req(class_conn2cliimp(conn), MDS_GETSTATUS, 1, &size,
  52                               NULL);
  53         if (!req)
  54                 GOTO(out, rc = -ENOMEM);
  55
  56         body = lustre_msg_buf(req->rq_reqmsg, 0);
  57         req->rq_level = LUSTRE_CONN_CON;
  58         req->rq_replen = lustre_msg_size(1, &size);
  59
  60         mds_pack_req_body(req);
  61         rc = ptlrpc_queue_wait(req);
  62         rc = ptlrpc_check_status(req, rc);
  63
  64         if (!rc) {
  65                 body = lustre_msg_buf(req->rq_repmsg, 0);
  66                 mds_unpack_body(body);
  67                 memcpy(rootfid, &body->fid1, sizeof(*rootfid));
  68
  69                 CDEBUG(D_NET, "root ino="LPU64", last_committed="LPU64
  70                        ", last_xid="LPU64"\n",
  71                        rootfid->id, req->rq_repmsg->last_committed,
  72                        req->rq_repmsg->last_xid);
  73         }
  74
  75         EXIT;
  76  out:
  77         ptlrpc_req_finished(req);
  78         return rc;
  79 }
  80
  81 int mdc_getlovinfo(struct obd_device *obd, struct lustre_handle *mdc_connh,
  82                    struct ptlrpc_request **request)
  83 {
  84         struct ptlrpc_request *req;
  85         struct mds_status_req *streq;
  86         int rc, size[2] = {sizeof(*streq)};
  87         ENTRY;
  88
  89         req = ptlrpc_prep_req(class_conn2cliimp(mdc_connh), MDS_GETLOVINFO, 1,
  90                               size, NULL);
  91         if (!req)
  92                 GOTO(out, rc = -ENOMEM);
  93
  94         *request = req;
  95         streq = lustre_msg_buf(req->rq_reqmsg, 0);
  96         streq->flags = HTON__u32(MDS_STATUS_LOV);
  97         streq->repbuf = HTON__u32(8192);
  98
  99         /* prepare for reply */
 100         req->rq_level = LUSTRE_CONN_CON;
 101         size[0] = 512;
 102         size[1] = 8192;
 103         req->rq_replen = lustre_msg_size(2, size);
 104
 105         rc = ptlrpc_queue_wait(req);
 106         rc = ptlrpc_check_status(req, rc);
 107
 108  out:
 109         RETURN(rc);
 110 }
 111
 112
 113 int mdc_getattr(struct lustre_handle *conn,
 114                 obd_id ino, int type, unsigned long valid, size_t ea_size,
 115                 struct ptlrpc_request **request)
 116 {
 117         struct ptlrpc_request *req;
 118         struct mds_body *body;
 119         int rc, size[2] = {sizeof(*body), 0}, bufcount = 1;
 120         ENTRY;
 121
 122         req = ptlrpc_prep_req(class_conn2cliimp(conn), MDS_GETATTR, 1, size,
 123                               NULL);
 124         if (!req)
 125                 GOTO(out, rc = -ENOMEM);
 126
 127         body = lustre_msg_buf(req->rq_reqmsg, 0);
 128         ll_ino2fid(&body->fid1, ino, 0, type);
 129         body->valid = valid;
 130
 131         if (S_ISREG(type)) {
 132                 struct client_obd *mdc = &class_conn2obd(conn)->u.cli;
 133                 bufcount = 2;
 134                 size[1] = mdc->cl_max_mds_easize;
 135         } else if (valid & OBD_MD_LINKNAME) {
 136                 bufcount = 2;
 137                 size[1] = ea_size;
 138                 body->size = ea_size;
 139                 CDEBUG(D_INODE, "allocating %d bytes for symlink in packet\n",
 140                        ea_size);
 141         }
 142         req->rq_replen = lustre_msg_size(bufcount, size);
 143         mds_pack_req_body(req);
 144
 145         rc = ptlrpc_queue_wait(req);
 146         rc = ptlrpc_check_status(req, rc);
 147
 148         if (!rc) {
 149                 body = lustre_msg_buf(req->rq_repmsg, 0);
 150                 mds_unpack_body(body);
 151                 CDEBUG(D_NET, "mode: %o\n", body->mode);
 152         }
 153
 154         EXIT;
 155  out:
 156         *request = req;
 157         return rc;
 158 }
 159
 160 void d_delete_aliases(struct inode *inode)
 161 {
 162         struct dentry *dentry = NULL;
 163         struct list_head *tmp;
 164         struct ll_sb_info *sbi = ll_i2sbi(inode);
 165         ENTRY;
 166
 167         spin_lock(&dcache_lock);
 168         list_for_each(tmp, &inode->i_dentry) {
 169                 dentry = list_entry(tmp, struct dentry, d_alias);
 170
 171                 //                if (atomic_read(&dentry->d_count))
 172                 //      continue;
 173                 //if (!list_empty(&dentry->d_lru))
 174                 //        continue;
 175
 176                 list_del_init(&dentry->d_hash);
 177                 list_add(&dentry->d_hash, &sbi->ll_orphan_dentry_list);
 178         }
 179
 180         spin_unlock(&dcache_lock);
 181         EXIT;
 182 }
 183
 184 static int mdc_blocking_ast(struct ldlm_lock *lock, struct ldlm_lock_desc *desc,
 185                             void *data, __u32 data_len, int flag)
 186 {
 187         int rc;
 188         struct lustre_handle lockh;
 189         ENTRY;
 190
 191         switch (flag) {
 192         case LDLM_CB_BLOCKING:
 193                 ldlm_lock2handle(lock, &lockh);
 194                 rc = ldlm_cli_cancel(&lockh);
 195                 if (rc < 0) {
 196                         CDEBUG(D_INODE, "ldlm_cli_cancel: %d\n", rc);
 197                         RETURN(rc);
 198                 }
 199                 break;
 200         case LDLM_CB_CANCELING: {
 201                 /* Invalidate all dentries associated with this inode */
 202                 struct inode *inode = data;
 203
 204                 LASSERT(inode != NULL);
 205                 LASSERT(data_len == sizeof(*inode));
 206
 207                 if (S_ISDIR(inode->i_mode)) {
 208                         CDEBUG(D_INODE, "invalidating inode %ld\n",
 209                                inode->i_ino);
 210
 211                         ll_invalidate_inode_pages(inode);
 212                 }
 213
 214                 LASSERT(igrab(inode) == inode);
 215                 d_delete_aliases(inode);
 216                 iput(inode);
 217                 break;
 218         }
 219         default:
 220                 LBUG();
 221         }
 222
 223         RETURN(0);
 224 }
 225
 226 /* This should be called with both the request and the reply still packed. */
 227 void mdc_store_inode_generation(struct ptlrpc_request *req, int reqoff,
 228                                 int repoff)
 229 {
 230         struct mds_rec_create *rec = lustre_msg_buf(req->rq_reqmsg, reqoff);
 231         struct mds_body *body = lustre_msg_buf(req->rq_repmsg, repoff);
 232
 233         memcpy(&rec->cr_replayfid, &body->fid1, sizeof rec->cr_replayfid);
 234 }
 235
 236 int mdc_enqueue(struct lustre_handle *conn, int lock_type,
 237                 struct lookup_intent *it, int lock_mode, struct inode *dir,
 238                 struct dentry *de, struct lustre_handle *lockh,
 239                 char *tgt, int tgtlen, void *data, int datalen)
 240 {
 241         struct ptlrpc_request *req;
 242         struct obd_device *obddev = class_conn2obd(conn);
 243         __u64 res_id[RES_NAME_SIZE] = {dir->i_ino, (__u64)dir->i_generation};
 244         int size[6] = {sizeof(struct ldlm_request), sizeof(struct ldlm_intent)};
 245         int rc, flags = LDLM_FL_HAS_INTENT;
 246         int repsize[3] = {sizeof(struct ldlm_reply),
 247                           sizeof(struct mds_body),
 248                           obddev->u.cli.cl_max_mds_easize};
 249         struct ldlm_reply *dlm_rep;
 250         struct ldlm_intent *lit;
 251         struct ldlm_request *lockreq;
 252         ENTRY;
 253
 254         LDLM_DEBUG_NOLOCK("mdsintent %s dir %ld", ldlm_it2str(it->it_op),
 255                           dir->i_ino);
 256
 257         if (it->it_op & (IT_MKDIR | IT_CREAT | IT_SYMLINK | IT_MKNOD)) {
 258                 switch (it->it_op) {
 259                 case IT_MKDIR:
 260                         it->it_mode |= S_IFDIR;
 261                         break;
 262                 case (IT_CREAT|IT_OPEN):
 263                 case IT_CREAT:
 264                         it->it_mode |= S_IFREG;
 265                         break;
 266                 case IT_SYMLINK:
 267                         it->it_mode |= S_IFLNK;
 268                         break;
 269                 }
 270                 it->it_mode &= ~current->fs->umask;
 271
 272                 size[2] = sizeof(struct mds_rec_create);
 273                 size[3] = de->d_name.len + 1;
 274                 size[4] = tgtlen + 1;
 275                 req = ptlrpc_prep_req(class_conn2cliimp(conn), LDLM_ENQUEUE, 5,
 276                                       size, NULL);
 277                 if (!req)
 278                         RETURN(-ENOMEM);
 279
 280                 /* pack the intent */
 281                 lit = lustre_msg_buf(req->rq_reqmsg, 1);
 282                 lit->opc = NTOH__u64((__u64)it->it_op);
 283
 284                 /* pack the intended request */
 285                 mds_create_pack(req, 2, dir, it->it_mode, 0, current->fsuid,
 286                                 current->fsgid, CURRENT_TIME, de->d_name.name,
 287                                 de->d_name.len, tgt, tgtlen);
 288                 req->rq_replen = lustre_msg_size(3, repsize);
 289         } else if (it->it_op == IT_RENAME2) {
 290                 struct dentry *old_de = it->it_data;
 291
 292                 size[2] = sizeof(struct mds_rec_rename);
 293                 size[3] = old_de->d_name.len + 1;
 294                 size[4] = de->d_name.len + 1;
 295                 req = ptlrpc_prep_req(class_conn2cliimp(conn), LDLM_ENQUEUE, 5,
 296                                       size, NULL);
 297                 if (!req)
 298                         RETURN(-ENOMEM);
 299
 300                 /* pack the intent */
 301                 lit = lustre_msg_buf(req->rq_reqmsg, 1);
 302                 lit->opc = NTOH__u64((__u64)it->it_op);
 303
 304                 /* pack the intended request */
 305                 mds_rename_pack(req, 2, old_de->d_parent->d_inode, dir,
 306                                 old_de->d_name.name, old_de->d_name.len,
 307                                 de->d_name.name, de->d_name.len);
 308                 req->rq_replen = lustre_msg_size(3, repsize);
 309         } else if (it->it_op == IT_LINK2) {
 310                 struct dentry *old_de = it->it_data;
 311
 312                 size[2] = sizeof(struct mds_rec_link);
 313                 size[3] = de->d_name.len + 1;
 314                 req = ptlrpc_prep_req(class_conn2cliimp(conn), LDLM_ENQUEUE, 4,
 315                                       size, NULL);
 316                 if (!req)
 317                         RETURN(-ENOMEM);
 318
 319                 /* pack the intent */
 320                 lit = lustre_msg_buf(req->rq_reqmsg, 1);
 321                 lit->opc = NTOH__u64((__u64)it->it_op);
 322
 323                 /* pack the intended request */
 324                 mds_link_pack(req, 2, old_de->d_inode, dir,
 325                               de->d_name.name, de->d_name.len);
 326                 req->rq_replen = lustre_msg_size(3, repsize);
 327         } else if (it->it_op == IT_UNLINK || it->it_op == IT_RMDIR) {
 328                 size[2] = sizeof(struct mds_rec_unlink);
 329                 size[3] = de->d_name.len + 1;
 330                 req = ptlrpc_prep_req(class_conn2cliimp(conn), LDLM_ENQUEUE, 4,
 331                                       size, NULL);
 332                 if (!req)
 333                         RETURN(-ENOMEM);
 334
 335                 /* pack the intent */
 336                 lit = lustre_msg_buf(req->rq_reqmsg, 1);
 337                 lit->opc = NTOH__u64((__u64)it->it_op);
 338
 339                 /* pack the intended request */
 340                 mds_unlink_pack(req, 2, dir, NULL,
 341                                 it->it_op == IT_UNLINK ? S_IFREG : S_IFDIR,
 342                                 de->d_name.name, de->d_name.len);
 343
 344                 req->rq_replen = lustre_msg_size(3, repsize);
 345         } else if (it->it_op  & (IT_GETATTR | IT_RENAME | IT_LINK |
 346                    IT_OPEN |  IT_SETATTR | IT_LOOKUP | IT_READLINK)) {
 347                 size[2] = sizeof(struct mds_body);
 348                 size[3] = de->d_name.len + 1;
 349
 350                 req = ptlrpc_prep_req(class_conn2cliimp(conn), LDLM_ENQUEUE, 4,
 351                                       size, NULL);
 352                 if (!req)
 353                         RETURN(-ENOMEM);
 354
 355                 /* pack the intent */
 356                 lit = lustre_msg_buf(req->rq_reqmsg, 1);
 357                 lit->opc = NTOH__u64((__u64)it->it_op);
 358
 359                 /* pack the intended request */
 360                 mds_getattr_pack(req, 2, dir, de->d_name.name, de->d_name.len);
 361
 362                 /* get ready for the reply */
 363                 req->rq_replen = lustre_msg_size(3, repsize);
 364         } else if (it->it_op == IT_READDIR) {
 365                 req = ptlrpc_prep_req(class_conn2cliimp(conn), LDLM_ENQUEUE, 1,
 366                                       size, NULL);
 367                 if (!req)
 368                         RETURN(-ENOMEM);
 369
 370                 /* get ready for the reply */
 371                 req->rq_replen = lustre_msg_size(1, repsize);
 372         } else {
 373                 LBUG();
 374                 RETURN(-EINVAL);
 375         }
 376 #warning FIXME: the data here needs to be different if a lock was granted for a different inode
 377         rc = ldlm_cli_enqueue(conn, req, obddev->obd_namespace, NULL, res_id,
 378                               lock_type, NULL, 0, lock_mode, &flags,
 379                               ldlm_completion_ast, mdc_blocking_ast, data,
 380                               datalen, lockh);
 381
 382         if (it->it_op != IT_READDIR) {
 383                 /* XXX This should become a lustre_msg flag, but for now... */
 384                 __u32 *opp = lustre_msg_buf(req->rq_reqmsg, 2);
 385                 *opp |= REINT_REPLAYING;
 386         }
 387
 388         if (rc == -ENOENT) {
 389                 /* This can go when we're sure that this can never happen */
 390                 LBUG();
 391         }
 392         if (rc == ELDLM_LOCK_ABORTED) {
 393                 lock_mode = 0;
 394                 memset(lockh, 0, sizeof(*lockh));
 395                 /* rc = 0 */
 396         } else if (rc != 0) {
 397                 CERROR("ldlm_cli_enqueue: %d\n", rc);
 398                 RETURN(rc);
 399         }
 400
 401         /* On replay, we don't want the lock granted. */
 402         lockreq = lustre_msg_buf(req->rq_reqmsg, 0);
 403         lockreq->lock_flags |= LDLM_FL_INTENT_ONLY;
 404
 405         dlm_rep = lustre_msg_buf(req->rq_repmsg, 0);
 406         it->it_disposition = (int) dlm_rep->lock_policy_res1;
 407         it->it_status = (int) dlm_rep->lock_policy_res2;
 408         it->it_lock_mode = lock_mode;
 409         it->it_data = req;
 410
 411         RETURN(0);
 412 }
 413
 414 int mdc_cancel_unused(struct lustre_handle *conn, struct inode *inode,
 415                       int flags)
 416 {
 417         __u64 res_id[RES_NAME_SIZE] = {inode->i_ino, inode->i_generation};
 418         struct obd_device *obddev = class_conn2obd(conn);
 419         ENTRY;
 420         RETURN(ldlm_cli_cancel_unused(obddev->obd_namespace, res_id, flags));
 421 }
 422
 423 struct replay_open_data {
 424         struct lustre_handle *fh;
 425 };
 426
 427 static void mdc_replay_open(struct ptlrpc_request *req)
 428 {
 429         int offset;
 430         struct replay_open_data *saved;
 431         struct mds_body *body = lustre_msg_buf(req->rq_repmsg, 0);
 432
 433         if (lustre_msg_get_op_flags(req->rq_reqmsg) & MDS_OPEN_HAS_EA)
 434                 offset = 2;
 435         else
 436                 offset = 1;
 437
 438         saved = lustre_msg_buf(req->rq_reqmsg, offset);
 439         mds_unpack_body(body);
 440         CDEBUG(D_HA, "updating from "LPD64"/"LPD64" to "LPD64"/"LPD64"\n",
 441                saved->fh->addr, saved->fh->cookie,
 442                body->handle.addr, body->handle.cookie);
 443         memcpy(saved->fh, &body->handle, sizeof(body->handle));
 444 }
 445
 446 int mdc_open(struct lustre_handle *conn, obd_id ino, int type, int flags,
 447              struct lov_stripe_md *lsm, struct lustre_handle *fh,
 448              struct ptlrpc_request **request)
 449 {
 450         struct mds_body *body;
 451         struct replay_open_data *replay_data;
 452         int rc, size[3] = {sizeof(*body), sizeof(*replay_data)}, bufcount = 2;
 453         struct ptlrpc_request *req;
 454         ENTRY;
 455
 456         if (lsm) {
 457                 bufcount = 3;
 458                 size[2] = size[1]; /* shuffle the spare data along */
 459
 460                 size[1] = lsm->lsm_mds_easize;
 461         }
 462
 463         req = ptlrpc_prep_req(class_conn2cliimp(conn), MDS_OPEN, bufcount, size,
 464                               NULL);
 465         if (!req)
 466                 GOTO(out, rc = -ENOMEM);
 467
 468         if (lsm)
 469                 lustre_msg_set_op_flags(req->rq_reqmsg, MDS_OPEN_HAS_EA);
 470
 471
 472         req->rq_flags |= PTL_RPC_FL_REPLAY;
 473         body = lustre_msg_buf(req->rq_reqmsg, 0);
 474
 475         ll_ino2fid(&body->fid1, ino, 0, type);
 476         body->flags = HTON__u32(flags);
 477         memcpy(&body->handle, fh, sizeof(body->handle));
 478
 479         if (lsm)
 480                 lov_packmd(lustre_msg_buf(req->rq_reqmsg, 1), lsm);
 481
 482         req->rq_replen = lustre_msg_size(1, size);
 483
 484         rc = ptlrpc_queue_wait(req);
 485         rc = ptlrpc_check_status(req, rc);
 486         if (!rc) {
 487                 body = lustre_msg_buf(req->rq_repmsg, 0);
 488                 mds_unpack_body(body);
 489                 memcpy(fh, &body->handle, sizeof(*fh));
 490         }
 491
 492         /* If open is replayed, we need to fix up the fh. */
 493         req->rq_replay_cb = mdc_replay_open;
 494         replay_data = lustre_msg_buf(req->rq_reqmsg, lsm ? 2 : 1);
 495         replay_data->fh = fh;
 496
 497         EXIT;
 498  out:
 499         *request = req;
 500         return rc;
 501 }
 502
 503 int mdc_close(struct lustre_handle *conn, obd_id ino, int type,
 504               struct lustre_handle *fh, struct ptlrpc_request **request)
 505 {
 506         struct mds_body *body;
 507         int rc, size = sizeof(*body);
 508         struct ptlrpc_request *req;
 509
 510         req = ptlrpc_prep_req(class_conn2cliimp(conn), MDS_CLOSE, 1, &size,
 511                               NULL);
 512         if (!req)
 513                 GOTO(out, rc = -ENOMEM);
 514
 515         body = lustre_msg_buf(req->rq_reqmsg, 0);
 516         ll_ino2fid(&body->fid1, ino, 0, type);
 517         memcpy(&body->handle, fh, sizeof(body->handle));
 518
 519         req->rq_replen = lustre_msg_size(0, NULL);
 520
 521         rc = ptlrpc_queue_wait(req);
 522         rc = ptlrpc_check_status(req, rc);
 523
 524         EXIT;
 525  out:
 526         *request = req;
 527         return rc;
 528 }
 529
 530 int mdc_readpage(struct lustre_handle *conn, obd_id ino, int type, __u64 offset,
 531                  char *addr, struct ptlrpc_request **request)
 532 {
 533         struct ptlrpc_connection *connection =
 534                 client_conn2cli(conn)->cl_import.imp_connection;
 535         struct ptlrpc_request *req = NULL;
 536         struct ptlrpc_bulk_desc *desc = NULL;
 537         struct ptlrpc_bulk_page *bulk = NULL;
 538         struct mds_body *body;
 539         int rc, size = sizeof(*body);
 540         ENTRY;
 541
 542         CDEBUG(D_INODE, "inode: %ld\n", (long)ino);
 543
 544         desc = ptlrpc_prep_bulk(connection);
 545         if (desc == NULL)
 546                 GOTO(out, rc = -ENOMEM);
 547
 548         req = ptlrpc_prep_req(class_conn2cliimp(conn), MDS_READPAGE, 1, &size,
 549                               NULL);
 550         if (!req)
 551                 GOTO(out2, rc = -ENOMEM);
 552
 553         bulk = ptlrpc_prep_bulk_page(desc);
 554         bulk->bp_buflen = PAGE_SIZE;
 555         bulk->bp_buf = addr;
 556         bulk->bp_xid = req->rq_xid;
 557         desc->bd_portal = MDS_BULK_PORTAL;
 558
 559         rc = ptlrpc_register_bulk(desc);
 560         if (rc) {
 561                 CERROR("couldn't setup bulk sink: error %d.\n", rc);
 562                 GOTO(out2, rc);
 563         }
 564
 565         body = lustre_msg_buf(req->rq_reqmsg, 0);
 566         body->fid1.id = ino;
 567         body->fid1.f_type = type;
 568         body->size = offset;
 569
 570         req->rq_replen = lustre_msg_size(1, &size);
 571         rc = ptlrpc_queue_wait(req);
 572         rc = ptlrpc_check_status(req, rc);
 573         if (rc) {
 574                 ptlrpc_abort_bulk(desc);
 575                 GOTO(out2, rc);
 576         } else {
 577                 body = lustre_msg_buf(req->rq_repmsg, 0);
 578                 mds_unpack_body(body);
 579         }
 580
 581         EXIT;
 582  out2:
 583         ptlrpc_free_bulk(desc);
 584  out:
 585         *request = req;
 586         return rc;
 587 }
 588
 589 static int mdc_statfs(struct lustre_handle *conn, struct obd_statfs *osfs)
 590 {
 591         struct ptlrpc_request *req;
 592         int rc, size = sizeof(*osfs);
 593         ENTRY;
 594
 595         req = ptlrpc_prep_req(class_conn2cliimp(conn), MDS_STATFS, 0, NULL,
 596                               NULL);
 597         if (!req)
 598                 RETURN(-ENOMEM);
 599
 600         req->rq_replen = lustre_msg_size(1, &size);
 601
 602         rc = ptlrpc_queue_wait(req);
 603         rc = ptlrpc_check_status(req, rc);
 604
 605         if (rc)
 606                 GOTO(out, rc);
 607
 608         obd_statfs_unpack(osfs, lustre_msg_buf(req->rq_repmsg, 0));
 609
 610         EXIT;
 611 out:
 612         ptlrpc_req_finished(req);
 613
 614         return rc;
 615 }
 616 int mdc_attach(struct obd_device *dev,
 617                    obd_count len, void *data)
 618 {
 619         int rc;
 620         rc = lprocfs_reg_obd(dev, (struct lprocfs_vars*)status_var_nm_1,
 621                              (void*)dev);
 622         return rc;
 623 }
 624
 625 int mdc_detach(struct obd_device *dev)
 626 {
 627         int rc;
 628         rc = lprocfs_dereg_obd(dev);
 629         return rc;
 630
 631 }
 632 struct obd_ops mdc_obd_ops = {
 633         o_attach: mdc_attach,
 634         o_detach: mdc_detach,
 635         o_setup:   client_obd_setup,
 636         o_cleanup: client_obd_cleanup,
 637         o_connect: client_obd_connect,
 638         o_disconnect: client_obd_disconnect,
 639         o_statfs: mdc_statfs,
 640 };
 641
 642 static int __init ptlrpc_request_init(void)
 643 {
 644         int rc;
 645         rc = class_register_type(&mdc_obd_ops,
 646                                  (struct lprocfs_vars*)status_class_var,
 647                                  LUSTRE_MDC_NAME);
 648         if(rc)
 649                 RETURN(rc);
 650         return 0;
 651
 652 }
 653
 654 static void __exit ptlrpc_request_exit(void)
 655 {
 656
 657         class_unregister_type(LUSTRE_MDC_NAME);
 658
 659 }
 660
 661 MODULE_AUTHOR("Cluster File Systems <info@clusterfs.com>");
 662 MODULE_DESCRIPTION("Lustre Metadata Client v1.0");
 663 MODULE_LICENSE("GPL");
 664
 665 EXPORT_SYMBOL(d_delete_aliases);
 666 EXPORT_SYMBOL(mdc_getstatus);
 667 EXPORT_SYMBOL(mdc_getlovinfo);
 668 EXPORT_SYMBOL(mdc_enqueue);
 669 EXPORT_SYMBOL(mdc_cancel_unused);
 670 EXPORT_SYMBOL(mdc_getattr);
 671 EXPORT_SYMBOL(mdc_create);
 672 EXPORT_SYMBOL(mdc_unlink);
 673 EXPORT_SYMBOL(mdc_rename);
 674 EXPORT_SYMBOL(mdc_link);
 675 EXPORT_SYMBOL(mdc_readpage);
 676 EXPORT_SYMBOL(mdc_setattr);
 677 EXPORT_SYMBOL(mdc_close);
 678 EXPORT_SYMBOL(mdc_open);
 679
 680 EXPORT_SYMBOL(mdc_store_inode_generation);
 681
 682 module_init(ptlrpc_request_init);
 683 module_exit(ptlrpc_request_exit);