lustre/llite/super.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/lustre_dlm.h>
  20 #include <linux/init.h>
  21 #include <linux/fs.h>
  22 #include <linux/lprocfs_status.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_recover(struct recovd_data *, int);
  31 extern int ll_commitcbd_setup(struct ll_sb_info *);
  32 extern int ll_commitcbd_cleanup(struct ll_sb_info *);
  33
  34 extern void ll_proc_namespace(struct super_block* sb, char* osc, char* mdc);
  35
  36 static char *ll_read_opt(const char *opt, char *data)
  37 {
  38         char *value;
  39         char *retval;
  40         ENTRY;
  41
  42         CDEBUG(D_SUPER, "option: %s, data %s\n", opt, data);
  43         if ( strncmp(opt, data, strlen(opt)) )
  44                 RETURN(NULL);
  45         if ( (value = strchr(data, '=')) == NULL )
  46                 RETURN(NULL);
  47
  48         value++;
  49         OBD_ALLOC(retval, strlen(value) + 1);
  50         if ( !retval ) {
  51                 CERROR("out of memory!\n");
  52                 RETURN(NULL);
  53         }
  54
  55         memcpy(retval, value, strlen(value)+1);
  56         CDEBUG(D_SUPER, "Assigned option: %s, value %s\n", opt, retval);
  57         RETURN(retval);
  58 }
  59
  60 static int ll_set_opt(const char *opt, char *data, int fl)
  61 {
  62         ENTRY;
  63
  64         CDEBUG(D_SUPER, "option: %s, data %s\n", opt, data);
  65         if ( strncmp(opt, data, strlen(opt)) )
  66                 RETURN(0);
  67         else
  68                 RETURN(fl);
  69 }
  70
  71 static void ll_options(char *options, char **ost, char **mds, int *flags)
  72 {
  73         char *this_char;
  74         ENTRY;
  75
  76         if (!options) {
  77                 EXIT;
  78                 return;
  79         }
  80
  81         for (this_char = strtok (options, ",");
  82              this_char != NULL;
  83              this_char = strtok (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 static struct super_block * ll_read_super(struct super_block *sb,
  99                                           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(NULL);
 121         }
 122
 123         INIT_LIST_HEAD(&sbi->ll_conn_chain);
 124         INIT_LIST_HEAD(&sbi->ll_orphan_dentry_list);
 125         generate_random_uuid(uuid);
 126         class_uuid_unparse(uuid, sbi->ll_sb_uuid);
 127
 128         sb->u.generic_sbp = sbi;
 129
 130         ll_options(data, &osc, &mdc, &sbi->ll_flags);
 131
 132         if (!osc) {
 133                 CERROR("no osc\n");
 134                 GOTO(out_free, sb = NULL);
 135         }
 136
 137         if (!mdc) {
 138                 CERROR("no mdc\n");
 139                 GOTO(out_free, sb = NULL);
 140         }
 141
 142         obd = class_uuid2obd(mdc);
 143         if (!obd) {
 144                 CERROR("MDC %s: not setup or attached\n", mdc);
 145                 GOTO(out_free, sb = NULL);
 146         }
 147
 148         err = obd_connect(&sbi->ll_mdc_conn, obd, sbi->ll_sb_uuid,
 149                           ptlrpc_recovd, ll_recover);
 150         if (err) {
 151                 CERROR("cannot connect to %s: rc = %d\n", mdc, err);
 152                 GOTO(out_free, sb = NULL);
 153         }
 154
 155 #warning Mike: is this the right place to raise the connection level?
 156         mdc_conn = sbi2mdc(sbi)->cl_import.imp_connection;
 157         mdc_conn->c_level = LUSTRE_CONN_FULL;
 158         list_add(&mdc_conn->c_sb_chain, &sbi->ll_conn_chain);
 159
 160         obd = class_uuid2obd(osc);
 161         if (!obd) {
 162                 CERROR("OSC %s: not setup or attached\n", osc);
 163                 GOTO(out_mdc, sb = NULL);
 164         }
 165
 166         err = obd_connect(&sbi->ll_osc_conn, obd, sbi->ll_sb_uuid,
 167                           ptlrpc_recovd, ll_recover);
 168         if (err) {
 169                 CERROR("cannot connect to %s: rc = %d\n", osc, err);
 170                 GOTO(out_mdc, sb = NULL);
 171         }
 172
 173         err = mdc_getstatus(&sbi->ll_mdc_conn, &rootfid);
 174         if (err) {
 175                 CERROR("cannot mds_connect: rc = %d\n", err);
 176                 GOTO(out_mdc, sb = NULL);
 177         }
 178         CDEBUG(D_SUPER, "rootfid "LPU64"\n", rootfid.id);
 179         sbi->ll_rootino = rootfid.id;
 180
 181         memset(&osfs, 0, sizeof(osfs));
 182         err = obd_statfs(&sbi->ll_mdc_conn, &osfs);
 183         sb->s_blocksize = osfs.os_bsize;
 184         sb->s_blocksize_bits = log2(osfs.os_bsize);
 185         sb->s_magic = LL_SUPER_MAGIC;
 186         sb->s_maxbytes = (1ULL << (32 + 9)) - osfs.os_bsize;
 187
 188         sb->s_op = &ll_super_operations;
 189
 190         /* make root inode */
 191         err = mdc_getattr(&sbi->ll_mdc_conn, sbi->ll_rootino, S_IFDIR,
 192                           OBD_MD_FLNOTOBD|OBD_MD_FLBLOCKS, 0, &request);
 193         if (err) {
 194                 CERROR("mdc_getattr failed for root: rc = %d\n", err);
 195                 GOTO(out_request, sb = NULL);
 196         }
 197
 198         /* initialize committed transaction callback daemon */
 199         spin_lock_init(&sbi->ll_commitcbd_lock);
 200         init_waitqueue_head(&sbi->ll_commitcbd_waitq);
 201         init_waitqueue_head(&sbi->ll_commitcbd_ctl_waitq);
 202         sbi->ll_commitcbd_flags = 0;
 203         err = ll_commitcbd_setup(sbi);
 204         if (err) {
 205                 CERROR("failed to start commit callback daemon: rc = %d\n",err);
 206                 GOTO(out_request, sb = NULL);
 207         }
 208
 209         lic.lic_body = lustre_msg_buf(request->rq_repmsg, 0);
 210         lic.lic_lmm = NULL;
 211         LASSERT(sbi->ll_rootino != 0);
 212         root = iget4(sb, sbi->ll_rootino, NULL, &lic);
 213
 214         if (root) {
 215                 sb->s_root = d_alloc_root(root);
 216         } else {
 217                 CERROR("lustre_lite: bad iget4 for root\n");
 218                 GOTO(out_cdb, sb = NULL);
 219         }
 220
 221         ptlrpc_req_finished(request);
 222         request = NULL;
 223         ll_proc_namespace(sb, osc, mdc);
 224
 225 out_dev:
 226         if (mdc)
 227                 OBD_FREE(mdc, strlen(mdc) + 1);
 228         if (osc)
 229                 OBD_FREE(osc, strlen(osc) + 1);
 230
 231         RETURN(sb);
 232
 233 out_cdb:
 234         ll_commitcbd_cleanup(sbi);
 235 out_request:
 236         ptlrpc_req_finished(request);
 237         obd_disconnect(&sbi->ll_osc_conn);
 238 out_mdc:
 239         obd_disconnect(&sbi->ll_mdc_conn);
 240 out_free:
 241         OBD_FREE(sbi, sizeof(*sbi));
 242
 243         MOD_DEC_USE_COUNT;
 244         goto out_dev;
 245 } /* ll_read_super */
 246
 247 static void ll_put_super(struct super_block *sb)
 248 {
 249         struct ll_sb_info *sbi = ll_s2sbi(sb);
 250         struct list_head *tmp, *next;
 251         struct ll_fid rootfid;
 252         ENTRY;
 253
 254         list_del(&sbi->ll_conn_chain);
 255         ll_commitcbd_cleanup(sbi);
 256         obd_disconnect(&sbi->ll_osc_conn);
 257
 258         /* NULL request to force sync on the MDS, and get the last_committed
 259          * value to flush remaining RPCs from the sending queue on client.
 260          *
 261          * XXX This should be an mdc_sync() call to sync the whole MDS fs,
 262          *     which we can call for other reasons as well.
 263          */
 264         mdc_getstatus(&sbi->ll_mdc_conn, &rootfid);
 265
 266         lprocfs_dereg_mnt(sbi->ll_proc_root);
 267         sbi->ll_proc_root = NULL;
 268
 269         obd_disconnect(&sbi->ll_mdc_conn);
 270
 271         spin_lock(&dcache_lock);
 272         list_for_each_safe(tmp, next, &sbi->ll_orphan_dentry_list) {
 273                 struct dentry *dentry = list_entry(tmp, struct dentry, d_hash);
 274                 shrink_dcache_parent(dentry);
 275         }
 276         spin_unlock(&dcache_lock);
 277
 278         OBD_FREE(sbi, sizeof(*sbi));
 279
 280         MOD_DEC_USE_COUNT;
 281         EXIT;
 282 } /* ll_put_super */
 283
 284 static void ll_clear_inode(struct inode *inode)
 285 {
 286         struct ll_sb_info *sbi = ll_i2sbi(inode);
 287         struct ll_inode_info *lli = ll_i2info(inode);
 288         int rc;
 289         ENTRY;
 290
 291         rc = mdc_cancel_unused(&sbi->ll_mdc_conn, inode, LDLM_FL_NO_CALLBACK);
 292         if (rc < 0) {
 293                 CERROR("mdc_cancel_unused: %d\n", rc);
 294                 /* XXX FIXME do something dramatic */
 295         }
 296
 297         if (lli->lli_smd) {
 298                 rc = obd_cancel_unused(&sbi->ll_osc_conn, lli->lli_smd, 0);
 299                 if (rc < 0) {
 300                         CERROR("obd_cancel_unused: %d\n", rc);
 301                         /* XXX FIXME do something dramatic */
 302                 }
 303         }
 304
 305         if (atomic_read(&inode->i_count) == 0) {
 306                 char *symlink_name = lli->lli_symlink_name;
 307
 308                 if (lli->lli_smd)
 309                         obd_free_memmd(&sbi->ll_osc_conn, &lli->lli_smd);
 310
 311                 if (symlink_name) {
 312                         OBD_FREE(symlink_name, strlen(symlink_name) + 1);
 313                         lli->lli_symlink_name = NULL;
 314                 }
 315         }
 316
 317         EXIT;
 318 }
 319
 320 static void ll_delete_inode(struct inode *inode)
 321 {
 322         ENTRY;
 323         if (S_ISREG(inode->i_mode)) {
 324                 int err;
 325                 struct obdo *oa;
 326                 struct lov_stripe_md *lsm = ll_i2info(inode)->lli_smd;
 327
 328                 if (!lsm)
 329                         GOTO(out, -EINVAL);
 330
 331                 if (lsm->lsm_object_id == 0) {
 332                         CERROR("This really happens\n");
 333                         /* No obdo was ever created */
 334                         GOTO(out, 0);
 335                 }
 336
 337                 oa = obdo_alloc();
 338                 if (oa == NULL)
 339                         GOTO(out, -ENOMEM);
 340
 341                 oa->o_id = lsm->lsm_object_id;
 342                 oa->o_mode = inode->i_mode;
 343                 oa->o_valid = OBD_MD_FLID | OBD_MD_FLEASIZE | OBD_MD_FLTYPE;
 344
 345                 err = obd_destroy(ll_i2obdconn(inode), oa, lsm);
 346                 obdo_free(oa);
 347                 CDEBUG(D_SUPER, "obd destroy of objid "LPX64" error %d\n",
 348                        lsm->lsm_object_id, err);
 349         }
 350 out:
 351         clear_inode(inode);
 352         EXIT;
 353 }
 354
 355 /* like inode_setattr, but doesn't mark the inode dirty */
 356 static int ll_attr2inode(struct inode * inode, struct iattr * attr, int trunc)
 357 {
 358         unsigned int ia_valid = attr->ia_valid;
 359         int error = 0;
 360
 361         if ((ia_valid & ATTR_SIZE) && trunc) {
 362                 error = vmtruncate(inode, attr->ia_size);
 363                 if (error)
 364                         goto out;
 365         } else if (ia_valid & ATTR_SIZE)
 366                 inode->i_size = attr->ia_size;
 367
 368         if (ia_valid & ATTR_UID)
 369                 inode->i_uid = attr->ia_uid;
 370         if (ia_valid & ATTR_GID)
 371                 inode->i_gid = attr->ia_gid;
 372         if (ia_valid & ATTR_ATIME)
 373                 inode->i_atime = attr->ia_atime;
 374         if (ia_valid & ATTR_MTIME)
 375                 inode->i_mtime = attr->ia_mtime;
 376         if (ia_valid & ATTR_CTIME)
 377                 inode->i_ctime = attr->ia_ctime;
 378         if (ia_valid & ATTR_MODE) {
 379                 inode->i_mode = attr->ia_mode;
 380                 if (!in_group_p(inode->i_gid) && !capable(CAP_FSETID))
 381                         inode->i_mode &= ~S_ISGID;
 382         }
 383 out:
 384         return error;
 385 }
 386
 387 int ll_inode_setattr(struct inode *inode, struct iattr *attr, int do_trunc)
 388 {
 389         struct ptlrpc_request *request = NULL;
 390         struct ll_sb_info *sbi = ll_i2sbi(inode);
 391         int err;
 392
 393         ENTRY;
 394
 395         /* change incore inode */
 396         ll_attr2inode(inode, attr, do_trunc);
 397
 398         err = mdc_setattr(&sbi->ll_mdc_conn, inode, attr, &request);
 399         if (err)
 400                 CERROR("mdc_setattr fails (%d)\n", err);
 401
 402         ptlrpc_req_finished(request);
 403
 404         RETURN(err);
 405 }
 406
 407 int ll_setattr(struct dentry *de, struct iattr *attr)
 408 {
 409         int rc = inode_change_ok(de->d_inode, attr);
 410
 411         if (rc)
 412                 return rc;
 413
 414         return ll_inode_setattr(de->d_inode, attr, 1);
 415 }
 416
 417 static int ll_statfs(struct super_block *sb, struct statfs *sfs)
 418 {
 419         struct ll_sb_info *sbi = ll_s2sbi(sb);
 420         struct obd_statfs osfs;
 421         int rc;
 422         ENTRY;
 423
 424         memset(sfs, 0, sizeof(*sfs));
 425         rc = obd_statfs(&sbi->ll_mdc_conn, &osfs);
 426         statfs_unpack(sfs, &osfs);
 427         if (rc)
 428                 CERROR("mdc_statfs fails: rc = %d\n", rc);
 429         else
 430                 CDEBUG(D_SUPER, "mdc_statfs shows blocks "LPU64"/"LPU64
 431                        " objects "LPU64"/"LPU64"\n",
 432                        osfs.os_bavail, osfs.os_blocks,
 433                        osfs.os_ffree, osfs.os_files);
 434
 435         /* temporary until mds_statfs returns statfs info for all OSTs */
 436         if (!rc) {
 437                 rc = obd_statfs(&sbi->ll_osc_conn, &osfs);
 438                 if (rc) {
 439                         CERROR("obd_statfs fails: rc = %d\n", rc);
 440                         GOTO(out, rc);
 441                 }
 442                 CDEBUG(D_SUPER, "obd_statfs shows blocks "LPU64"/"LPU64
 443                        " objects "LPU64"/"LPU64"\n",
 444                        osfs.os_bavail, osfs.os_blocks,
 445                        osfs.os_ffree, osfs.os_files);
 446
 447                 while (osfs.os_blocks > ~0UL) {
 448                         sfs->f_bsize <<= 1;
 449
 450                         osfs.os_blocks >>= 1;
 451                         osfs.os_bfree >>= 1;
 452                         osfs.os_bavail >>= 1;
 453                 }
 454                 sfs->f_blocks = osfs.os_blocks;
 455                 sfs->f_bfree = osfs.os_bfree;
 456                 sfs->f_bavail = osfs.os_bavail;
 457                 if (osfs.os_ffree < (__u64)sfs->f_ffree)
 458                         sfs->f_ffree = osfs.os_ffree;
 459         }
 460
 461 out:
 462         RETURN(rc);
 463 }
 464
 465 void ll_update_inode(struct inode *inode, struct mds_body *body)
 466 {
 467         if (body->valid & OBD_MD_FLID)
 468                 inode->i_ino = body->ino;
 469         if (body->valid & OBD_MD_FLATIME)
 470                 inode->i_atime = body->atime;
 471         if (body->valid & OBD_MD_FLMTIME)
 472                 inode->i_mtime = body->mtime;
 473         if (body->valid & OBD_MD_FLCTIME)
 474                 inode->i_ctime = body->ctime;
 475         if (body->valid & OBD_MD_FLMODE)
 476                 inode->i_mode = (inode->i_mode & S_IFMT)|(body->mode & ~S_IFMT);
 477         if (body->valid & OBD_MD_FLTYPE)
 478                 inode->i_mode = (inode->i_mode & ~S_IFMT)|(body->mode & S_IFMT);
 479         if (body->valid & OBD_MD_FLUID)
 480                 inode->i_uid = body->uid;
 481         if (body->valid & OBD_MD_FLGID)
 482                 inode->i_gid = body->gid;
 483         if (body->valid & OBD_MD_FLFLAGS)
 484                 inode->i_flags = body->flags;
 485         if (body->valid & OBD_MD_FLNLINK)
 486                 inode->i_nlink = body->nlink;
 487         if (body->valid & OBD_MD_FLGENER)
 488                 inode->i_generation = body->generation;
 489         if (body->valid & OBD_MD_FLRDEV)
 490                 inode->i_rdev = body->rdev;
 491         if (body->valid & OBD_MD_FLSIZE)
 492                 inode->i_size = body->size;
 493 }
 494
 495 static void ll_read_inode2(struct inode *inode, void *opaque)
 496 {
 497         struct ll_read_inode2_cookie *lic = opaque;
 498         struct mds_body *body = lic->lic_body;
 499         struct ll_inode_info *lli = ll_i2info(inode);
 500         ENTRY;
 501
 502         sema_init(&lli->lli_open_sem, 1);
 503         atomic_set(&lli->lli_open_count, 0);
 504
 505         /* core attributes first */
 506         ll_update_inode(inode, body);
 507
 508         //if (body->valid & OBD_MD_FLEASIZE)
 509         LASSERT(!lli->lli_smd);
 510         if (lic && lic->lic_lmm)
 511                 obd_unpackmd(ll_i2obdconn(inode), &lli->lli_smd, lic->lic_lmm);
 512
 513         /* Get the authoritative file size */
 514         if (lli->lli_smd && (inode->i_mode & S_IFREG)) {
 515                 int rc;
 516                 LASSERT(lli->lli_smd->lsm_object_id != 0);
 517                 rc = ll_file_size(inode, lli->lli_smd);
 518                 if (rc) {
 519                         CERROR("ll_file_size: %d\n", rc);
 520                         /* FIXME: need to somehow prevent inode creation */
 521                         LBUG();
 522                         make_bad_inode(inode);
 523                 }
 524         }
 525
 526         /* OIDEBUG(inode); */
 527
 528         if (S_ISREG(inode->i_mode)) {
 529                 inode->i_op = &ll_file_inode_operations;
 530                 inode->i_fop = &ll_file_operations;
 531                 inode->i_mapping->a_ops = &ll_aops;
 532                 EXIT;
 533         } else if (S_ISDIR(inode->i_mode)) {
 534                 inode->i_op = &ll_dir_inode_operations;
 535                 inode->i_fop = &ll_dir_operations;
 536                 inode->i_mapping->a_ops = &ll_dir_aops;
 537                 EXIT;
 538         } else if (S_ISLNK(inode->i_mode)) {
 539                 inode->i_op = &ll_fast_symlink_inode_operations;
 540                 EXIT;
 541         } else {
 542                 init_special_inode(inode, inode->i_mode, inode->i_rdev);
 543                 EXIT;
 544         }
 545 }
 546
 547 static inline void invalidate_request_list(struct list_head *req_list)
 548 {
 549         struct list_head *tmp, *n;
 550         list_for_each_safe(tmp, n, req_list) {
 551                 struct ptlrpc_request *req =
 552                         list_entry(tmp, struct ptlrpc_request, rq_list);
 553                 CERROR("invalidating req xid "LPD64" op %d to %s:%d\n",
 554                        (unsigned long long)req->rq_xid, req->rq_reqmsg->opc,
 555                        req->rq_connection->c_remote_uuid,
 556                        req->rq_import->imp_client->cli_request_portal);
 557                 req->rq_flags |= PTL_RPC_FL_ERR;
 558                 wake_up(&req->rq_wait_for_rep);
 559         }
 560 }
 561
 562 void ll_umount_begin(struct super_block *sb)
 563 {
 564         struct ll_sb_info *sbi = ll_s2sbi(sb);
 565         struct list_head *ctmp;
 566
 567         ENTRY;
 568
 569         list_for_each(ctmp, &sbi->ll_conn_chain) {
 570                 struct ptlrpc_connection *conn;
 571                 conn = list_entry(ctmp, struct ptlrpc_connection, c_sb_chain);
 572
 573                 spin_lock(&conn->c_lock);
 574                 /* XXX should just be dealing with imports, probably through
 575                  * XXX iocontrol, need next-gen recovery! */
 576                 conn->c_flags |= CONN_INVALID;
 577                 invalidate_request_list(&conn->c_sending_head);
 578                 invalidate_request_list(&conn->c_delayed_head);
 579                 spin_unlock(&conn->c_lock);
 580         }
 581
 582         EXIT;
 583 }
 584
 585 /* exported operations */
 586 struct super_operations ll_super_operations =
 587 {
 588         read_inode2: ll_read_inode2,
 589         clear_inode: ll_clear_inode,
 590         delete_inode: ll_delete_inode,
 591         put_super: ll_put_super,
 592         statfs: ll_statfs,
 593         umount_begin: ll_umount_begin
 594 };
 595
 596 struct file_system_type lustre_lite_fs_type = {
 597         "lustre_lite", 0, ll_read_super, NULL
 598 };
 599
 600 static int __init init_lustre_lite(void)
 601 {
 602         printk(KERN_INFO "Lustre Lite 0.5.14, info@clusterfs.com\n");
 603         ll_file_data_slab = kmem_cache_create("ll_file_data",
 604                                               sizeof(struct ll_file_data), 0,
 605                                               SLAB_HWCACHE_ALIGN, NULL, NULL);
 606         if (ll_file_data_slab == NULL)
 607                 return -ENOMEM;
 608         return register_filesystem(&lustre_lite_fs_type);
 609 }
 610
 611 static void __exit exit_lustre_lite(void)
 612 {
 613         unregister_filesystem(&lustre_lite_fs_type);
 614         kmem_cache_destroy(ll_file_data_slab);
 615 }
 616
 617 MODULE_AUTHOR("Cluster File Systems, Inc. <info@clusterfs.com>");
 618 MODULE_DESCRIPTION("Lustre Lite Client File System v1.0");
 619 MODULE_LICENSE("GPL");
 620
 621 module_init(init_lustre_lite);
 622 module_exit(exit_lustre_lite);
 623 #endif