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/obd_lov.h>
  20 #include <linux/lustre_dlm.h>
  21 #include <linux/init.h>
  22 #include <linux/fs.h>
  23 #include <linux/lprocfs_status.h>
  24
  25 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
  26 kmem_cache_t *ll_file_data_slab;
  27 extern struct address_space_operations ll_aops;
  28 extern struct address_space_operations ll_dir_aops;
  29 struct super_operations ll_super_operations;
  30
  31 extern int ll_recover(struct recovd_data *, int);
  32 extern int ll_commitcbd_setup(struct ll_sb_info *);
  33 extern int ll_commitcbd_cleanup(struct ll_sb_info *);
  34
  35 extern void ll_proc_namespace(struct super_block* sb, char* osc, char* mdc);
  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 *this_char;
  75         ENTRY;
  76
  77         if (!options) {
  78                 EXIT;
  79                 return;
  80         }
  81
  82         for (this_char = strtok (options, ",");
  83              this_char != NULL;
  84              this_char = strtok (NULL, ",")) {
  85                 CDEBUG(D_SUPER, "this_char %s\n", this_char);
  86                 if ( (!*ost && (*ost = ll_read_opt("osc", this_char)))||
  87                      (!*mds && (*mds = ll_read_opt("mdc", this_char)))||
  88                      (!(*flags & LL_SBI_NOLCK) && ((*flags) = (*flags) |
  89                       ll_set_opt("nolock", this_char, LL_SBI_NOLCK))) )
  90                         continue;
  91         }
  92         EXIT;
  93 }
  94
  95 #ifndef log2
  96 #define log2(n) ffz(~(n))
  97 #endif
  98
  99 static struct super_block * ll_read_super(struct super_block *sb,
 100                                           void *data, int silent)
 101 {
 102         struct inode *root = 0;
 103         struct obd_device *obd;
 104         struct ll_sb_info *sbi;
 105         char *osc = NULL;
 106         char *mdc = NULL;
 107         int err;
 108         struct ll_fid rootfid;
 109         struct obd_statfs osfs;
 110         struct ptlrpc_request *request = NULL;
 111         struct ptlrpc_connection *mdc_conn;
 112         struct ll_read_inode2_cookie lic;
 113         class_uuid_t uuid;
 114
 115
 116
 117         ENTRY;
 118         MOD_INC_USE_COUNT;
 119
 120         OBD_ALLOC(sbi, sizeof(*sbi));
 121         if (!sbi) {
 122                 MOD_DEC_USE_COUNT;
 123                 RETURN(NULL);
 124         }
 125
 126         INIT_LIST_HEAD(&sbi->ll_conn_chain);
 127         INIT_LIST_HEAD(&sbi->ll_orphan_dentry_list);
 128         generate_random_uuid(uuid);
 129         class_uuid_unparse(uuid, sbi->ll_sb_uuid);
 130
 131         sb->u.generic_sbp = sbi;
 132
 133         ll_options(data, &osc, &mdc, &sbi->ll_flags);
 134
 135         if (!osc) {
 136                 CERROR("no osc\n");
 137                 GOTO(out_free, sb = NULL);
 138         }
 139
 140         if (!mdc) {
 141                 CERROR("no mdc\n");
 142                 GOTO(out_free, sb = NULL);
 143         }
 144
 145         obd = class_uuid2obd(mdc);
 146         if (!obd) {
 147                 CERROR("MDC %s: not setup or attached\n", mdc);
 148                 GOTO(out_free, sb = NULL);
 149         }
 150
 151         err = obd_connect(&sbi->ll_mdc_conn, obd, sbi->ll_sb_uuid,
 152                           ptlrpc_recovd, ll_recover);
 153         if (err) {
 154                 CERROR("cannot connect to %s: rc = %d\n", mdc, err);
 155                 GOTO(out_free, sb = NULL);
 156         }
 157
 158 #warning Mike: is this the right place to raise the connection level?
 159         mdc_conn = sbi2mdc(sbi)->cl_import.imp_connection;
 160         mdc_conn->c_level = LUSTRE_CONN_FULL;
 161         list_add(&mdc_conn->c_sb_chain, &sbi->ll_conn_chain);
 162
 163         obd = class_uuid2obd(osc);
 164         if (!obd) {
 165                 CERROR("OSC %s: not setup or attached\n", osc);
 166                 GOTO(out_mdc, sb = NULL);
 167         }
 168
 169         err = obd_connect(&sbi->ll_osc_conn, obd, sbi->ll_sb_uuid,
 170                           ptlrpc_recovd, ll_recover);
 171         if (err) {
 172                 CERROR("cannot connect to %s: rc = %d\n", osc, err);
 173                 GOTO(out_mdc, sb = NULL);
 174         }
 175
 176         err = mdc_getstatus(&sbi->ll_mdc_conn, &rootfid);
 177         if (err) {
 178                 CERROR("cannot mds_connect: rc = %d\n", err);
 179                 GOTO(out_mdc, sb = NULL);
 180         }
 181         CDEBUG(D_SUPER, "rootfid "LPU64"\n", rootfid.id);
 182         sbi->ll_rootino = rootfid.id;
 183
 184         memset(&osfs, 0, sizeof(osfs));
 185         err = obd_statfs(&sbi->ll_mdc_conn, &osfs);
 186         sb->s_blocksize = osfs.os_bsize;
 187         sb->s_blocksize_bits = log2(osfs.os_bsize);
 188         sb->s_magic = LL_SUPER_MAGIC;
 189         sb->s_maxbytes = (1ULL << (32 + 9)) - osfs.os_bsize;
 190
 191         sb->s_op = &ll_super_operations;
 192
 193         /* make root inode */
 194         err = mdc_getattr(&sbi->ll_mdc_conn, sbi->ll_rootino, S_IFDIR,
 195                           OBD_MD_FLNOTOBD|OBD_MD_FLBLOCKS, 0, &request);
 196         if (err) {
 197                 CERROR("mdc_getattr failed for root: rc = %d\n", err);
 198                 GOTO(out_request, sb = NULL);
 199         }
 200
 201         /* initialize committed transaction callback daemon */
 202         spin_lock_init(&sbi->ll_commitcbd_lock);
 203         init_waitqueue_head(&sbi->ll_commitcbd_waitq);
 204         init_waitqueue_head(&sbi->ll_commitcbd_ctl_waitq);
 205         sbi->ll_commitcbd_flags = 0;
 206         err = ll_commitcbd_setup(sbi);
 207         if (err) {
 208                 CERROR("failed to start commit callback daemon: rc = %d\n",err);
 209                 GOTO(out_request, sb = NULL);
 210         }
 211
 212         lic.lic_body = lustre_msg_buf(request->rq_repmsg, 0);
 213         lic.lic_lmm = NULL;
 214         LASSERT(sbi->ll_rootino != 0);
 215         root = iget4(sb, sbi->ll_rootino, NULL, &lic);
 216
 217         if (root) {
 218                 sb->s_root = d_alloc_root(root);
 219         } else {
 220                 CERROR("lustre_lite: bad iget4 for root\n");
 221                 GOTO(out_cdb, sb = NULL);
 222         }
 223
 224         ptlrpc_req_finished(request);
 225         request = NULL;
 226         ll_proc_namespace(sb, osc, mdc);
 227
 228 out_dev:
 229         if (mdc)
 230                 OBD_FREE(mdc, strlen(mdc) + 1);
 231         if (osc)
 232                 OBD_FREE(osc, strlen(osc) + 1);
 233
 234         RETURN(sb);
 235
 236 out_cdb:
 237         ll_commitcbd_cleanup(sbi);
 238 out_request:
 239         ptlrpc_req_finished(request);
 240         obd_disconnect(&sbi->ll_osc_conn);
 241 out_mdc:
 242         obd_disconnect(&sbi->ll_mdc_conn);
 243 out_free:
 244         OBD_FREE(sbi, sizeof(*sbi));
 245
 246         MOD_DEC_USE_COUNT;
 247         goto out_dev;
 248 } /* ll_read_super */
 249
 250 static void ll_put_super(struct super_block *sb)
 251 {
 252         struct ll_sb_info *sbi = ll_s2sbi(sb);
 253         struct list_head *tmp, *next;
 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 sending 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         lprocfs_dereg_mnt(sbi->ll_proc_root);
 270         sbi->ll_proc_root=0;
 271
 272         obd_disconnect(&sbi->ll_mdc_conn);
 273
 274         spin_lock(&dcache_lock);
 275         list_for_each_safe(tmp, next, &sbi->ll_orphan_dentry_list) {
 276                 struct dentry *dentry = list_entry(tmp, struct dentry, d_hash);
 277                 shrink_dcache_parent(dentry);
 278         }
 279         spin_unlock(&dcache_lock);
 280
 281         OBD_FREE(sbi, sizeof(*sbi));
 282
 283         MOD_DEC_USE_COUNT;
 284         EXIT;
 285 } /* ll_put_super */
 286
 287 static void ll_clear_inode(struct inode *inode)
 288 {
 289         struct ll_sb_info *sbi = ll_i2sbi(inode);
 290         struct ll_inode_info *lli = ll_i2info(inode);
 291         int rc;
 292         ENTRY;
 293
 294         rc = mdc_cancel_unused(&sbi->ll_mdc_conn, inode, LDLM_FL_NO_CALLBACK);
 295         if (rc < 0) {
 296                 CERROR("mdc_cancel_unused: %d\n", rc);
 297                 /* XXX FIXME do something dramatic */
 298         }
 299
 300         if (lli->lli_smd) {
 301                 rc = obd_cancel_unused(&sbi->ll_osc_conn, lli->lli_smd,
 302                                        LDLM_FL_NO_CALLBACK);
 303                 if (rc < 0) {
 304                         CERROR("obd_cancel_unused: %d\n", rc);
 305                         /* XXX FIXME do something dramatic */
 306                 }
 307         }
 308
 309         if (atomic_read(&inode->i_count) == 0) {
 310                 struct lov_stripe_md *lsm = lli->lli_smd;
 311                 char *symlink_name = lli->lli_symlink_name;
 312
 313                 if (lsm) {
 314                         OBD_FREE(lsm, ll_ost_easize(inode->i_sb));
 315                         lli->lli_smd = NULL;
 316                 }
 317                 if (symlink_name) {
 318                         OBD_FREE(symlink_name, strlen(symlink_name) + 1);
 319                         lli->lli_symlink_name = NULL;
 320                 }
 321         }
 322
 323         EXIT;
 324 }
 325
 326 static void ll_delete_inode(struct inode *inode)
 327 {
 328         ENTRY;
 329         if (S_ISREG(inode->i_mode)) {
 330                 int err;
 331                 struct obdo *oa;
 332                 struct lov_stripe_md *lsm = ll_i2info(inode)->lli_smd;
 333
 334                 if (!lsm)
 335                         GOTO(out, -EINVAL);
 336
 337                 if (lsm->lsm_object_id == 0) {
 338                         CERROR("This really happens\n");
 339                         /* No obdo was ever created */
 340                         GOTO(out, 0);
 341                 }
 342
 343                 oa = obdo_alloc();
 344                 if (oa == NULL)
 345                         GOTO(out, -ENOMEM);
 346
 347                 oa->o_id = lsm->lsm_object_id;
 348                 oa->o_easize = ll_mds_easize(inode->i_sb);
 349                 oa->o_mode = inode->i_mode;
 350                 oa->o_valid = OBD_MD_FLID | OBD_MD_FLEASIZE | OBD_MD_FLTYPE;
 351
 352                 err = obd_destroy(ll_i2obdconn(inode), oa, lsm);
 353                 obdo_free(oa);
 354                 CDEBUG(D_SUPER, "obd destroy of objid "LPX64" error %d\n",
 355                        lsm->lsm_object_id, err);
 356         }
 357 out:
 358         clear_inode(inode);
 359         EXIT;
 360 }
 361
 362 /* like inode_setattr, but doesn't mark the inode dirty */
 363 static int ll_attr2inode(struct inode * inode, struct iattr * attr, int trunc)
 364 {
 365         unsigned int ia_valid = attr->ia_valid;
 366         int error = 0;
 367
 368         if ((ia_valid & ATTR_SIZE) && trunc) {
 369                 error = vmtruncate(inode, attr->ia_size);
 370                 if (error)
 371                         goto out;
 372         } else if (ia_valid & ATTR_SIZE)
 373                 inode->i_size = attr->ia_size;
 374
 375         if (ia_valid & ATTR_UID)
 376                 inode->i_uid = attr->ia_uid;
 377         if (ia_valid & ATTR_GID)
 378                 inode->i_gid = attr->ia_gid;
 379         if (ia_valid & ATTR_ATIME)
 380                 inode->i_atime = attr->ia_atime;
 381         if (ia_valid & ATTR_MTIME)
 382                 inode->i_mtime = attr->ia_mtime;
 383         if (ia_valid & ATTR_CTIME)
 384                 inode->i_ctime = attr->ia_ctime;
 385         if (ia_valid & ATTR_MODE) {
 386                 inode->i_mode = attr->ia_mode;
 387                 if (!in_group_p(inode->i_gid) && !capable(CAP_FSETID))
 388                         inode->i_mode &= ~S_ISGID;
 389         }
 390 out:
 391         return error;
 392 }
 393
 394 int ll_inode_setattr(struct inode *inode, struct iattr *attr, int do_trunc)
 395 {
 396         struct ptlrpc_request *request = NULL;
 397         struct ll_sb_info *sbi = ll_i2sbi(inode);
 398         int err;
 399
 400         ENTRY;
 401
 402         /* change incore inode */
 403         ll_attr2inode(inode, attr, do_trunc);
 404
 405         err = mdc_setattr(&sbi->ll_mdc_conn, inode, attr, &request);
 406         if (err)
 407                 CERROR("mdc_setattr fails (%d)\n", err);
 408
 409         ptlrpc_req_finished(request);
 410
 411         RETURN(err);
 412 }
 413
 414 int ll_setattr(struct dentry *de, struct iattr *attr)
 415 {
 416         int rc = inode_change_ok(de->d_inode, attr);
 417
 418         if (rc)
 419                 return rc;
 420
 421         return ll_inode_setattr(de->d_inode, attr, 1);
 422 }
 423
 424 static int ll_statfs(struct super_block *sb, struct statfs *sfs)
 425 {
 426         struct ll_sb_info *sbi = ll_s2sbi(sb);
 427         struct obd_statfs osfs;
 428         int rc;
 429         ENTRY;
 430
 431         memset(sfs, 0, sizeof(*sfs));
 432         rc = obd_statfs(&sbi->ll_mdc_conn, &osfs);
 433         statfs_unpack(sfs, &osfs);
 434         if (rc)
 435                 CERROR("mdc_statfs fails: rc = %d\n", rc);
 436         else
 437                 CDEBUG(D_SUPER, "mdc_statfs shows blocks "LPU64"/"LPU64
 438                        " objects "LPU64"/"LPU64"\n",
 439                        osfs.os_bavail, osfs.os_blocks,
 440                        osfs.os_ffree, osfs.os_files);
 441
 442         /* temporary until mds_statfs returns statfs info for all OSTs */
 443         if (!rc) {
 444                 rc = obd_statfs(&sbi->ll_osc_conn, &osfs);
 445                 if (rc) {
 446                         CERROR("obd_statfs fails: rc = %d\n", rc);
 447                         GOTO(out, rc);
 448                 }
 449                 CDEBUG(D_SUPER, "obd_statfs shows blocks "LPU64"/"LPU64
 450                        " objects "LPU64"/"LPU64"\n",
 451                        osfs.os_bavail, osfs.os_blocks,
 452                        osfs.os_ffree, osfs.os_files);
 453
 454                 while (osfs.os_blocks > ~0UL) {
 455                         sfs->f_bsize <<= 1;
 456
 457                         osfs.os_blocks >>= 1;
 458                         osfs.os_bfree >>= 1;
 459                         osfs.os_bavail >>= 1;
 460                 }
 461                 sfs->f_blocks = osfs.os_blocks;
 462                 sfs->f_bfree = osfs.os_bfree;
 463                 sfs->f_bavail = osfs.os_bavail;
 464                 if (osfs.os_ffree < (__u64)sfs->f_ffree)
 465                         sfs->f_ffree = osfs.os_ffree;
 466         }
 467
 468 out:
 469         RETURN(rc);
 470 }
 471
 472 void ll_update_inode(struct inode *inode, struct mds_body *body)
 473 {
 474         if (body->valid & OBD_MD_FLID)
 475                 inode->i_ino = body->ino;
 476         if (body->valid & OBD_MD_FLATIME)
 477                 inode->i_atime = body->atime;
 478         if (body->valid & OBD_MD_FLMTIME)
 479                 inode->i_mtime = body->mtime;
 480         if (body->valid & OBD_MD_FLCTIME)
 481                 inode->i_ctime = body->ctime;
 482         if (body->valid & OBD_MD_FLMODE)
 483                 inode->i_mode = (inode->i_mode & S_IFMT)|(body->mode & ~S_IFMT);
 484         if (body->valid & OBD_MD_FLTYPE)
 485                 inode->i_mode = (inode->i_mode & ~S_IFMT)|(body->mode & S_IFMT);
 486         if (body->valid & OBD_MD_FLUID)
 487                 inode->i_uid = body->uid;
 488         if (body->valid & OBD_MD_FLGID)
 489                 inode->i_gid = body->gid;
 490         if (body->valid & OBD_MD_FLFLAGS)
 491                 inode->i_flags = body->flags;
 492         if (body->valid & OBD_MD_FLNLINK)
 493                 inode->i_nlink = body->nlink;
 494         if (body->valid & OBD_MD_FLGENER)
 495                 inode->i_generation = body->generation;
 496         if (body->valid & OBD_MD_FLRDEV)
 497                 inode->i_rdev = body->rdev;
 498         if (body->valid & OBD_MD_FLSIZE)
 499                 inode->i_size = body->size;
 500 }
 501
 502 static void ll_read_inode2(struct inode *inode, void *opaque)
 503 {
 504         struct ll_read_inode2_cookie *lic = opaque;
 505         struct mds_body *body = lic->lic_body;
 506         struct ll_inode_info *lli = ll_i2info(inode);
 507         ENTRY;
 508
 509         sema_init(&lli->lli_open_sem, 1);
 510         atomic_set(&lli->lli_open_count, 0);
 511
 512         /* core attributes first */
 513         ll_update_inode(inode, body);
 514
 515         //if (body->valid & OBD_MD_FLEASIZE)
 516         if (lic && lic->lic_lmm) {
 517                 struct lov_mds_md *lmm = lic->lic_lmm;
 518                 int size;
 519
 520                 /* XXX This should probably not be an error in the future,
 521                  *     when we allow LOV OSTs to be added.
 522                  */
 523                 if (lmm->lmm_easize != ll_mds_easize(inode->i_sb)) {
 524                         CERROR("Striping metadata size error %ld\n",
 525                                inode->i_ino);
 526                         LBUG();
 527                 }
 528                 size = ll_ost_easize(inode->i_sb);
 529                 OBD_ALLOC(lli->lli_smd, size);
 530                 if (!lli->lli_smd) {
 531                         CERROR("No memory for %d\n", size);
 532                         LBUG();
 533                 }
 534                 lov_unpackmd(lli->lli_smd, lmm);
 535         } else {
 536                 lli->lli_smd = NULL;
 537         }
 538
 539         /* Get the authoritative file size */
 540         if (lli->lli_smd && (inode->i_mode & S_IFREG)) {
 541                 int rc;
 542
 543                 rc = ll_file_size(inode, lli->lli_smd);
 544                 if (rc) {
 545                         CERROR("ll_file_size: %d\n", rc);
 546                         /* FIXME: need to somehow prevent inode creation */
 547                         LBUG();
 548                 }
 549         }
 550
 551         /* OIDEBUG(inode); */
 552
 553         if (S_ISREG(inode->i_mode)) {
 554                 inode->i_op = &ll_file_inode_operations;
 555                 inode->i_fop = &ll_file_operations;
 556                 inode->i_mapping->a_ops = &ll_aops;
 557                 EXIT;
 558         } else if (S_ISDIR(inode->i_mode)) {
 559                 inode->i_op = &ll_dir_inode_operations;
 560                 inode->i_fop = &ll_dir_operations;
 561                 inode->i_mapping->a_ops = &ll_dir_aops;
 562                 EXIT;
 563         } else if (S_ISLNK(inode->i_mode)) {
 564                 inode->i_op = &ll_fast_symlink_inode_operations;
 565                 EXIT;
 566         } else {
 567                 init_special_inode(inode, inode->i_mode, inode->i_rdev);
 568                 EXIT;
 569         }
 570 }
 571
 572 static inline void invalidate_request_list(struct list_head *req_list)
 573 {
 574         struct list_head *tmp, *n;
 575         list_for_each_safe(tmp, n, req_list) {
 576                 struct ptlrpc_request *req =
 577                         list_entry(tmp, struct ptlrpc_request, rq_list);
 578                 CERROR("invalidating req xid "LPD64" op %d to %s:%d\n",
 579                        (unsigned long long)req->rq_xid, req->rq_reqmsg->opc,
 580                        req->rq_connection->c_remote_uuid,
 581                        req->rq_import->imp_client->cli_request_portal);
 582                 req->rq_flags |= PTL_RPC_FL_ERR;
 583                 wake_up(&req->rq_wait_for_rep);
 584         }
 585 }
 586
 587 void ll_umount_begin(struct super_block *sb)
 588 {
 589         struct ll_sb_info *sbi = ll_s2sbi(sb);
 590         struct list_head *ctmp;
 591
 592         ENTRY;
 593
 594         list_for_each(ctmp, &sbi->ll_conn_chain) {
 595                 struct ptlrpc_connection *conn;
 596                 conn = list_entry(ctmp, struct ptlrpc_connection, c_sb_chain);
 597
 598                 spin_lock(&conn->c_lock);
 599                 /* XXX should just be dealing with imports, probably through
 600                  * XXX iocontrol, need next-gen recovery! */
 601                 conn->c_flags |= CONN_INVALID;
 602                 invalidate_request_list(&conn->c_sending_head);
 603                 invalidate_request_list(&conn->c_delayed_head);
 604                 spin_unlock(&conn->c_lock);
 605         }
 606
 607         EXIT;
 608 }
 609
 610 /* exported operations */
 611 struct super_operations ll_super_operations =
 612 {
 613         read_inode2: ll_read_inode2,
 614         clear_inode: ll_clear_inode,
 615         delete_inode: ll_delete_inode,
 616         put_super: ll_put_super,
 617         statfs: ll_statfs,
 618         umount_begin: ll_umount_begin
 619 };
 620
 621 struct file_system_type lustre_lite_fs_type = {
 622         "lustre_lite", 0, ll_read_super, NULL
 623 };
 624
 625 static int __init init_lustre_lite(void)
 626 {
 627         printk(KERN_INFO "Lustre Lite 0.5.14, info@clusterfs.com\n");
 628         ll_file_data_slab = kmem_cache_create("ll_file_data",
 629                                               sizeof(struct ll_file_data), 0,
 630                                               SLAB_HWCACHE_ALIGN, NULL, NULL);
 631         if (ll_file_data_slab == NULL)
 632                 return -ENOMEM;
 633         return register_filesystem(&lustre_lite_fs_type);
 634 }
 635
 636 static void __exit exit_lustre_lite(void)
 637 {
 638         unregister_filesystem(&lustre_lite_fs_type);
 639         kmem_cache_destroy(ll_file_data_slab);
 640 }
 641
 642 MODULE_AUTHOR("Cluster File Systems, Inc. <info@clusterfs.com>");
 643 MODULE_DESCRIPTION("Lustre Lite Client File System v1.0");
 644 MODULE_LICENSE("GPL");
 645
 646 module_init(init_lustre_lite);
 647 module_exit(exit_lustre_lite);
 648 #endif