lustre/llite/super25.c

   1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
   2  * vim:expandtab:shiftwidth=8:tabstop=8:
   3  *
   4  * Lustre Light Super operations
   5  *
   6  * This code is issued under the GNU General Public License.
   7  * See the file COPYING in this distribution
   8  *
   9  * Copryright (C) 2002 Cluster File Systems, Inc.
  10  */
  11
  12 #define DEBUG_SUBSYSTEM S_LLITE
  13
  14 #include <linux/module.h>
  15 #include <linux/random.h>
  16 #include <linux/version.h>
  17 #include <linux/lustre_lite.h>
  18 #include <linux/lustre_ha.h>
  19 #include <linux/obd_lov.h>
  20 #include <linux/lustre_dlm.h>
  21 #include <linux/init.h>
  22 #include <linux/fs.h>
  23
  24 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
  25 kmem_cache_t *ll_file_data_slab;
  26 extern struct address_space_operations ll_aops;
  27 extern struct address_space_operations ll_dir_aops;
  28 struct super_operations ll_super_operations;
  29
  30 extern int ll_init_inodecache(void);
  31 extern void ll_destroy_inodecache(void);
  32 extern int ll_recover(struct recovd_data *, int);
  33 extern int ll_commitcbd_setup(struct ll_sb_info *);
  34 extern int ll_commitcbd_cleanup(struct ll_sb_info *);
  35 int ll_read_inode2(struct inode *inode, void *opaque);
  36
  37 static char *ll_read_opt(const char *opt, char *data)
  38 {
  39         char *value;
  40         char *retval;
  41         ENTRY;
  42
  43         CDEBUG(D_SUPER, "option: %s, data %s\n", opt, data);
  44         if ( strncmp(opt, data, strlen(opt)) )
  45                 RETURN(NULL);
  46         if ( (value = strchr(data, '=')) == NULL )
  47                 RETURN(NULL);
  48
  49         value++;
  50         OBD_ALLOC(retval, strlen(value) + 1);
  51         if ( !retval ) {
  52                 CERROR("out of memory!\n");
  53                 RETURN(NULL);
  54         }
  55
  56         memcpy(retval, value, strlen(value)+1);
  57         CDEBUG(D_SUPER, "Assigned option: %s, value %s\n", opt, retval);
  58         RETURN(retval);
  59 }
  60
  61 static int ll_set_opt(const char *opt, char *data, int fl)
  62 {
  63         ENTRY;
  64
  65         CDEBUG(D_SUPER, "option: %s, data %s\n", opt, data);
  66         if ( strncmp(opt, data, strlen(opt)) )
  67                 RETURN(0);
  68         else
  69                 RETURN(fl);
  70 }
  71
  72 static void ll_options(char *options, char **ost, char **mds, int *flags)
  73 {
  74         char *opt_ptr = options;
  75         char *this_char;
  76         ENTRY;
  77
  78         if (!options) {
  79                 EXIT;
  80                 return;
  81         }
  82
  83         while ((this_char = strsep (&opt_ptr, ",")) != NULL) {
  84                 CDEBUG(D_SUPER, "this_char %s\n", this_char);
  85                 if ( (!*ost && (*ost = ll_read_opt("osc", this_char)))||
  86                      (!*mds && (*mds = ll_read_opt("mdc", this_char)))||
  87                      (!(*flags & LL_SBI_NOLCK) && ((*flags) = (*flags) |
  88                       ll_set_opt("nolock", this_char, LL_SBI_NOLCK))) )
  89                         continue;
  90         }
  91         EXIT;
  92 }
  93
  94 #ifndef log2
  95 #define log2(n) ffz(~(n))
  96 #endif
  97
  98
  99 static int ll_fill_super(struct super_block *sb, void *data, int silent)
 100 {
 101         struct inode *root = 0;
 102         struct obd_device *obd;
 103         struct ll_sb_info *sbi;
 104         char *osc = NULL;
 105         char *mdc = NULL;
 106         int err;
 107         struct ll_fid rootfid;
 108         struct obd_statfs osfs;
 109         struct ptlrpc_request *request = NULL;
 110         struct ptlrpc_connection *mdc_conn;
 111         struct ll_read_inode2_cookie lic;
 112         class_uuid_t uuid;
 113
 114         ENTRY;
 115         MOD_INC_USE_COUNT;
 116
 117         OBD_ALLOC(sbi, sizeof(*sbi));
 118         if (!sbi) {
 119                 MOD_DEC_USE_COUNT;
 120                 RETURN(-ENOMEM);
 121         }
 122
 123         INIT_LIST_HEAD(&sbi->ll_conn_chain);
 124         generate_random_uuid(uuid);
 125         class_uuid_unparse(uuid, sbi->ll_sb_uuid);
 126
 127         sb->s_fs_info = sbi;
 128
 129         ll_options(data, &osc, &mdc, &sbi->ll_flags);
 130
 131         if (!osc) {
 132                 CERROR("no osc\n");
 133                 GOTO(out_free, sb = NULL);
 134         }
 135
 136         if (!mdc) {
 137                 CERROR("no mdc\n");
 138                 GOTO(out_free, sb = NULL);
 139         }
 140
 141         obd = class_uuid2obd(mdc);
 142         if (!obd) {
 143                 CERROR("MDC %s: not setup or attached\n", mdc);
 144                 GOTO(out_free, sb = NULL);
 145         }
 146
 147         err = obd_connect(&sbi->ll_mdc_conn, obd, sbi->ll_sb_uuid,
 148                           ptlrpc_recovd, ll_recover);
 149         if (err) {
 150                 CERROR("cannot connect to %s: rc = %d\n", mdc, err);
 151                 GOTO(out_free, sb = NULL);
 152         }
 153
 154 #warning Peter: is this the right place to raise the connection level?
 155         mdc_conn = sbi2mdc(sbi)->cl_import.imp_connection;
 156         mdc_conn->c_level = LUSTRE_CONN_FULL;
 157         list_add(&mdc_conn->c_sb_chain, &sbi->ll_conn_chain);
 158
 159         obd = class_uuid2obd(osc);
 160         if (!obd) {
 161                 CERROR("OSC %s: not setup or attached\n", osc);
 162                 GOTO(out_mdc, sb = NULL);
 163         }
 164
 165         err = obd_connect(&sbi->ll_osc_conn, obd, sbi->ll_sb_uuid,
 166                           ptlrpc_recovd, ll_recover);
 167         if (err) {
 168                 CERROR("cannot connect to %s: rc = %d\n", osc, err);
 169                 GOTO(out_mdc, sb = NULL);
 170         }
 171
 172         err = mdc_getstatus(&sbi->ll_mdc_conn, &rootfid);
 173         if (err) {
 174                 CERROR("cannot mds_connect: rc = %d\n", err);
 175                 GOTO(out_mdc, sb = NULL);
 176         }
 177         CDEBUG(D_SUPER, "rootfid "LPU64"\n", rootfid.id);
 178         sbi->ll_rootino = rootfid.id;
 179
 180         memset(&osfs, 0, sizeof(osfs));
 181         err = mdc_statfs(&sbi->ll_mdc_conn, &osfs);
 182         sb->s_blocksize = osfs.os_bsize;
 183         sb->s_blocksize_bits = log2(osfs.os_bsize);
 184         sb->s_magic = LL_SUPER_MAGIC;
 185         sb->s_maxbytes = (1ULL << (32 + 9)) - osfs.os_bsize;
 186
 187         sb->s_op = &ll_super_operations;
 188
 189         /* make root inode */
 190         err = mdc_getattr(&sbi->ll_mdc_conn, sbi->ll_rootino, S_IFDIR,
 191                           OBD_MD_FLNOTOBD|OBD_MD_FLBLOCKS, 0, &request);
 192         if (err) {
 193                 CERROR("mdc_getattr failed for root: rc = %d\n", err);
 194                 GOTO(out_request, sb = NULL);
 195         }
 196
 197         /* initialize committed transaction callback daemon */
 198         spin_lock_init(&sbi->ll_commitcbd_lock);
 199         init_waitqueue_head(&sbi->ll_commitcbd_waitq);
 200         init_waitqueue_head(&sbi->ll_commitcbd_ctl_waitq);
 201         sbi->ll_commitcbd_flags = 0;
 202         err = ll_commitcbd_setup(sbi);
 203         if (err) {
 204                 CERROR("failed to start commit callback daemon: rc = %d\n",err);
 205                 GOTO(out_request, sb = NULL);
 206         }
 207
 208         lic.lic_body = lustre_msg_buf(request->rq_repmsg, 0);
 209         lic.lic_lmm = NULL;
 210         root = iget5_locked(sb, sbi->ll_rootino, NULL,
 211                             ll_read_inode2, &lic);
 212
 213         if (root) {
 214                 sb->s_root = d_alloc_root(root);
 215         } else {
 216                 CERROR("lustre_lite: bad iget4 for root\n");
 217                 GOTO(out_cdb, sb = NULL);
 218         }
 219
 220         ptlrpc_req_finished(request);
 221         request = NULL;
 222
 223 out_dev:
 224         if (mdc)
 225                 OBD_FREE(mdc, strlen(mdc) + 1);
 226         if (osc)
 227                 OBD_FREE(osc, strlen(osc) + 1);
 228
 229         RETURN(0);
 230
 231 out_cdb:
 232         ll_commitcbd_cleanup(sbi);
 233 out_request:
 234         ptlrpc_req_finished(request);
 235         obd_disconnect(&sbi->ll_osc_conn);
 236 out_mdc:
 237         obd_disconnect(&sbi->ll_mdc_conn);
 238 out_free:
 239         OBD_FREE(sbi, sizeof(*sbi));
 240
 241         MOD_DEC_USE_COUNT;
 242         goto out_dev;
 243 } /* ll_fill_super */
 244
 245 struct super_block * ll_get_sb(struct file_system_type *fs_type,
 246                                    int flags, char *devname, void * data)
 247 {
 248         return get_sb_nodev(fs_type, flags, data, ll_fill_super);
 249 }
 250
 251 static void ll_put_super(struct super_block *sb)
 252 {
 253         struct ll_sb_info *sbi = ll_s2sbi(sb);
 254         struct ll_fid rootfid;
 255         ENTRY;
 256
 257         list_del(&sbi->ll_conn_chain);
 258         ll_commitcbd_cleanup(sbi);
 259         obd_disconnect(&sbi->ll_osc_conn);
 260
 261         /* NULL request to force sync on the MDS, and get the last_committed
 262          * value to flush remaining RPCs from the pending queue on client.
 263          *
 264          * XXX This should be an mdc_sync() call to sync the whole MDS fs,
 265          *     which we can call for other reasons as well.
 266          */
 267         mdc_getstatus(&sbi->ll_mdc_conn, &rootfid);
 268
 269         obd_disconnect(&sbi->ll_mdc_conn);
 270         OBD_FREE(sbi, sizeof(*sbi));
 271
 272         MOD_DEC_USE_COUNT;
 273         EXIT;
 274 } /* ll_put_super */
 275
 276 static void ll_clear_inode(struct inode *inode)
 277 {
 278         ENTRY;
 279
 280         if (atomic_read(&inode->i_count) == 0) {
 281                 struct ll_inode_info *lli = ll_i2info(inode);
 282                 struct lov_stripe_md *lsm = lli->lli_smd;
 283                 char *symlink_name = lli->lli_symlink_name;
 284
 285                 if (lsm) {
 286                         OBD_FREE(lsm, ll_ost_easize(inode->i_sb));
 287                         lli->lli_smd = NULL;
 288                 }
 289                 if (symlink_name) {
 290                         OBD_FREE(symlink_name, strlen(symlink_name) + 1);
 291                         lli->lli_symlink_name = NULL;
 292                 }
 293         }
 294         EXIT;
 295 }
 296
 297 static void ll_delete_inode(struct inode *inode)
 298 {
 299         ENTRY;
 300         if (S_ISREG(inode->i_mode)) {
 301                 int err;
 302                 struct obdo *oa;
 303                 struct lov_stripe_md *lsm = ll_i2info(inode)->lli_smd;
 304
 305                 if (!lsm)
 306                         GOTO(out, -EINVAL);
 307
 308                 if (lsm->lsm_object_id == 0) {
 309                         CERROR("This really happens\n");
 310                         /* No obdo was ever created */
 311                         GOTO(out, 0);
 312                 }
 313
 314                 oa = obdo_alloc();
 315                 if (oa == NULL)
 316                         GOTO(out, -ENOMEM);
 317
 318                 oa->o_id = lsm->lsm_object_id;
 319                 oa->o_easize = ll_mds_easize(inode->i_sb);
 320                 oa->o_mode = inode->i_mode;
 321                 oa->o_valid = OBD_MD_FLID | OBD_MD_FLEASIZE | OBD_MD_FLTYPE;
 322
 323                 err = obd_destroy(ll_i2obdconn(inode), oa, lsm);
 324                 obdo_free(oa);
 325                 CDEBUG(D_SUPER, "obd destroy of objid "LPX64" error %d\n",
 326                        lsm->lsm_object_id, err);
 327         }
 328 out:
 329         clear_inode(inode);
 330         EXIT;
 331 }
 332
 333 /* like inode_setattr, but doesn't mark the inode dirty */
 334 static int ll_attr2inode(struct inode * inode, struct iattr * attr, int trunc)
 335 {
 336         unsigned int ia_valid = attr->ia_valid;
 337         int error = 0;
 338
 339         if ((ia_valid & ATTR_SIZE) && trunc) {
 340                 error = vmtruncate(inode, attr->ia_size);
 341                 if (error)
 342                         goto out;
 343         } else if (ia_valid & ATTR_SIZE)
 344                 inode->i_size = attr->ia_size;
 345
 346         if (ia_valid & ATTR_UID)
 347                 inode->i_uid = attr->ia_uid;
 348         if (ia_valid & ATTR_GID)
 349                 inode->i_gid = attr->ia_gid;
 350         if (ia_valid & ATTR_ATIME)
 351                 inode->i_atime = attr->ia_atime;
 352         if (ia_valid & ATTR_MTIME)
 353                 inode->i_mtime = attr->ia_mtime;
 354         if (ia_valid & ATTR_CTIME)
 355                 inode->i_ctime = attr->ia_ctime;
 356         if (ia_valid & ATTR_MODE) {
 357                 inode->i_mode = attr->ia_mode;
 358                 if (!in_group_p(inode->i_gid) && !capable(CAP_FSETID))
 359                         inode->i_mode &= ~S_ISGID;
 360         }
 361 out:
 362         return error;
 363 }
 364
 365 int ll_inode_setattr(struct inode *inode, struct iattr *attr, int do_trunc)
 366 {
 367         struct ptlrpc_request *request = NULL;
 368         struct ll_sb_info *sbi = ll_i2sbi(inode);
 369         int err;
 370
 371         ENTRY;
 372
 373         /* change incore inode */
 374         ll_attr2inode(inode, attr, do_trunc);
 375
 376         err = mdc_setattr(&sbi->ll_mdc_conn, inode, attr, &request);
 377         if (err)
 378                 CERROR("mdc_setattr fails (%d)\n", err);
 379
 380         ptlrpc_req_finished(request);
 381
 382         RETURN(err);
 383 }
 384
 385 int ll_setattr(struct dentry *de, struct iattr *attr)
 386 {
 387         int rc = inode_change_ok(de->d_inode, attr);
 388
 389         if (rc)
 390                 return rc;
 391
 392         return ll_inode_setattr(de->d_inode, attr, 1);
 393 }
 394
 395 static int ll_statfs(struct super_block *sb, struct statfs *sfs)
 396 {
 397         struct ll_sb_info *sbi = ll_s2sbi(sb);
 398         struct obd_statfs osfs;
 399         int rc;
 400         ENTRY;
 401
 402         memset(sfs, 0, sizeof(*sfs));
 403         rc = obd_statfs(&sbi->ll_mdc_conn, &osfs);
 404         statfs_unpack(sfs, &osfs);
 405         if (rc)
 406                 CERROR("mdc_statfs fails: rc = %d\n", rc);
 407         else
 408                 CDEBUG(D_SUPER, "mdc_statfs shows blocks "LPU64"/"LPU64
 409                        " objects "LPU64"/"LPU64"\n",
 410                        osfs.os_bavail, osfs.os_blocks,
 411                        osfs.os_ffree, osfs.os_files);
 412
 413         /* temporary until mds_statfs returns statfs info for all OSTs */
 414         if (!rc) {
 415                 rc = obd_statfs(&sbi->ll_osc_conn, &osfs);
 416                 if (rc) {
 417                         CERROR("obd_statfs fails: rc = %d\n", rc);
 418                         GOTO(out, rc);
 419                 }
 420                 CDEBUG(D_SUPER, "obd_statfs shows blocks "LPU64"/"LPU64
 421                        " objects "LPU64"/"LPU64"\n",
 422                        osfs.os_bavail, osfs.os_blocks,
 423                        osfs.os_ffree, osfs.os_files);
 424
 425                 while (osfs.os_blocks > ~0UL) {
 426                         sfs->f_bsize <<= 1;
 427
 428                         osfs.os_blocks >>= 1;
 429                         osfs.os_bfree >>= 1;
 430                         osfs.os_bavail >>= 1;
 431                 }
 432                 sfs->f_blocks = osfs.os_blocks;
 433                 sfs->f_bfree = osfs.os_bfree;
 434                 sfs->f_bavail = osfs.os_bavail;
 435                 if (osfs.os_ffree < (__u64)sfs->f_ffree)
 436                         sfs->f_ffree = osfs.os_ffree;
 437         }
 438
 439 out:
 440         RETURN(rc);
 441 }
 442
 443 void ll_update_inode(struct inode *inode, struct mds_body *body)
 444 {
 445         if (body->valid & OBD_MD_FLID)
 446                 inode->i_ino = body->ino;
 447         if (body->valid & OBD_MD_FLATIME)
 448                 inode->i_atime = body->atime;
 449         if (body->valid & OBD_MD_FLMTIME)
 450                 inode->i_mtime = body->mtime;
 451         if (body->valid & OBD_MD_FLCTIME)
 452                 inode->i_ctime = body->ctime;
 453         if (body->valid & OBD_MD_FLMODE)
 454                 inode->i_mode = (inode->i_mode & S_IFMT)|(body->mode & ~S_IFMT);
 455         if (body->valid & OBD_MD_FLTYPE)
 456                 inode->i_mode = (inode->i_mode & ~S_IFMT)|(body->mode & S_IFMT);
 457         if (body->valid & OBD_MD_FLUID)
 458                 inode->i_uid = body->uid;
 459         if (body->valid & OBD_MD_FLGID)
 460                 inode->i_gid = body->gid;
 461         if (body->valid & OBD_MD_FLFLAGS)
 462                 inode->i_flags = body->flags;
 463         if (body->valid & OBD_MD_FLNLINK)
 464                 inode->i_nlink = body->nlink;
 465         if (body->valid & OBD_MD_FLGENER)
 466                 inode->i_generation = body->generation;
 467         if (body->valid & OBD_MD_FLRDEV)
 468                 inode->i_rdev = to_kdev_t(body->rdev);
 469         if (body->valid & OBD_MD_FLSIZE)
 470                 inode->i_size = body->size;
 471 }
 472
 473 int ll_read_inode2(struct inode *inode, void *opaque)
 474 {
 475         struct ll_read_inode2_cookie *lic = opaque;
 476         struct mds_body *body = lic->lic_body;
 477         struct ll_inode_info *lli = ll_i2info(inode);
 478         ENTRY;
 479
 480         sema_init(&lli->lli_open_sem, 1);
 481
 482         /* core attributes first */
 483         ll_update_inode(inode, body);
 484
 485         //if (body->valid & OBD_MD_FLEASIZE)
 486         if (lic && lic->lic_lmm) {
 487                 struct lov_mds_md *lmm = lic->lic_lmm;
 488                 int size;
 489
 490                 /* XXX This should probably not be an error in the future,
 491                  *     when we allow LOV OSTs to be added.
 492                  */
 493                 if (lmm->lmm_easize != ll_mds_easize(inode->i_sb)) {
 494                         CERROR("Striping metadata size error %ld\n",
 495                                inode->i_ino);
 496                         LBUG();
 497                 }
 498                 size = ll_ost_easize(inode->i_sb);
 499                 OBD_ALLOC(lli->lli_smd, size);
 500                 if (!lli->lli_smd) {
 501                         CERROR("No memory for %d\n", size);
 502                         LBUG();
 503                 }
 504                 lov_unpackmd(lli->lli_smd, lmm);
 505         } else {
 506                 lli->lli_smd = NULL;
 507         }
 508
 509         /* Get the authoritative file size */
 510         if (lli->lli_smd && (inode->i_mode & S_IFREG)) {
 511                 int rc;
 512
 513                 rc = ll_file_size(inode, lli->lli_smd);
 514                 if (rc) {
 515                         CERROR("ll_file_size: %d\n", rc);
 516                         /* FIXME: need to somehow prevent inode creation */
 517                         LBUG();
 518                 }
 519         }
 520
 521         /* OIDEBUG(inode); */
 522
 523         if (S_ISREG(inode->i_mode)) {
 524                 inode->i_op = &ll_file_inode_operations;
 525                 inode->i_fop = &ll_file_operations;
 526                 inode->i_mapping->a_ops = &ll_aops;
 527                 EXIT;
 528         } else if (S_ISDIR(inode->i_mode)) {
 529                 inode->i_op = &ll_dir_inode_operations;
 530                 inode->i_fop = &ll_dir_operations;
 531                 inode->i_mapping->a_ops = &ll_dir_aops;
 532                 EXIT;
 533         } else if (S_ISLNK(inode->i_mode)) {
 534                 inode->i_op = &ll_fast_symlink_inode_operations;
 535                 EXIT;
 536         } else {
 537                 init_special_inode(inode, inode->i_mode,
 538                                    kdev_t_to_nr(inode->i_rdev));
 539                 EXIT;
 540         }
 541         return 0;
 542 }
 543
 544 static inline void invalidate_request_list(struct list_head *req_list)
 545 {
 546         struct list_head *tmp, *n;
 547         list_for_each_safe(tmp, n, req_list) {
 548                 struct ptlrpc_request *req =
 549                         list_entry(tmp, struct ptlrpc_request, rq_list);
 550                 CERROR("invalidating req xid %d op %d to %s:%d\n",
 551                        (unsigned long long)req->rq_xid, req->rq_reqmsg->opc,
 552                        req->rq_connection->c_remote_uuid,
 553                        req->rq_import->imp_client->cli_request_portal);
 554                 req->rq_flags |= PTL_RPC_FL_ERR;
 555                 wake_up(&req->rq_wait_for_rep);
 556         }
 557 }
 558
 559 void ll_umount_begin(struct super_block *sb)
 560 {
 561         struct ll_sb_info *sbi = ll_s2sbi(sb);
 562         struct list_head *ctmp;
 563
 564         ENTRY;
 565
 566         list_for_each(ctmp, &sbi->ll_conn_chain) {
 567                 struct ptlrpc_connection *conn;
 568                 conn = list_entry(ctmp, struct ptlrpc_connection, c_sb_chain);
 569
 570                 spin_lock(&conn->c_lock);
 571                 conn->c_flags |= CONN_INVALID;
 572                 invalidate_request_list(&conn->c_sending_head);
 573                 invalidate_request_list(&conn->c_delayed_head);
 574                 spin_unlock(&conn->c_lock);
 575         }
 576
 577         EXIT;
 578 }
 579
 580
 581 static kmem_cache_t *ll_inode_cachep;
 582
 583 static struct inode *ll_alloc_inode(struct super_block *sb)
 584 {
 585         struct ll_inode_info *lli;
 586         lli = kmem_cache_alloc(ll_inode_cachep, SLAB_KERNEL);
 587         if (!lli)
 588                 return NULL;
 589
 590         memset(lli, 0, (char *)&lli->lli_vfs_inode - (char *)lli);
 591         sema_init(&lli->lli_open_sem, 1);
 592
 593         return &lli->lli_vfs_inode;
 594 }
 595
 596 static void ll_destroy_inode(struct inode *inode)
 597 {
 598         kmem_cache_free(ll_inode_cachep, ll_i2info(inode));
 599 }
 600
 601 static void init_once(void * foo, kmem_cache_t * cachep, unsigned long flags)
 602 {
 603         struct ll_inode_info *lli = foo;
 604
 605         if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
 606             SLAB_CTOR_CONSTRUCTOR)
 607                 inode_init_once(&lli->lli_vfs_inode);
 608 }
 609
 610 int ll_init_inodecache(void)
 611 {
 612         ll_inode_cachep = kmem_cache_create("lustre_inode_cache",
 613                                             sizeof(struct ll_inode_info),
 614                                             0, SLAB_HWCACHE_ALIGN,
 615                                             init_once, NULL);
 616         if (ll_inode_cachep == NULL)
 617                 return -ENOMEM;
 618         return 0;
 619 }
 620
 621 void ll_destroy_inodecache(void)
 622 {
 623         if (kmem_cache_destroy(ll_inode_cachep))
 624                 CERROR("ll_inode_cache: not all structures were freed\n");
 625 }
 626
 627
 628
 629 /* exported operations */
 630 struct super_operations ll_super_operations =
 631 {
 632         alloc_inode: ll_alloc_inode,
 633         destroy_inode: ll_destroy_inode,
 634         clear_inode: ll_clear_inode,
 635         delete_inode: ll_delete_inode,
 636         put_super: ll_put_super,
 637         statfs: ll_statfs,
 638         umount_begin: ll_umount_begin
 639 };
 640
 641 struct file_system_type lustre_lite_fs_type = {
 642         .owner  = THIS_MODULE,
 643         .name =   "lustre_lite",
 644         .get_sb = ll_get_sb,
 645         .kill_sb = kill_litter_super,
 646 };
 647
 648 static int __init init_lustre_lite(void)
 649 {
 650         int rc;
 651         printk(KERN_INFO "Lustre Lite 0.5.14, info@clusterfs.com\n");
 652         rc = ll_init_inodecache();
 653         if (rc)
 654                 return -ENOMEM;
 655         ll_file_data_slab = kmem_cache_create("ll_file_data",
 656                                               sizeof(struct ll_file_data), 0,
 657                                               SLAB_HWCACHE_ALIGN, NULL, NULL);
 658         if (ll_file_data_slab == NULL) {
 659                 ll_destroy_inodecache();
 660                 return -ENOMEM;
 661         }
 662         return register_filesystem(&lustre_lite_fs_type);
 663 }
 664
 665 static void __exit exit_lustre_lite(void)
 666 {
 667         unregister_filesystem(&lustre_lite_fs_type);
 668         ll_destroy_inodecache();
 669         kmem_cache_destroy(ll_file_data_slab);
 670 }
 671
 672 MODULE_AUTHOR("Cluster File Systems, Inc. <info@clusterfs.com>");
 673 MODULE_DESCRIPTION("Lustre Lite Client File System v1.0");
 674 MODULE_LICENSE("GPL");
 675
 676 module_init(init_lustre_lite);
 677 module_exit(exit_lustre_lite);
 678 #endif