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 #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_init_inodecache(void);
  32 extern void ll_destroy_inodecache(void);
  33 extern int ll_recover(struct recovd_data *, int);
  34 extern int ll_commitcbd_setup(struct ll_sb_info *);
  35 extern int ll_commitcbd_cleanup(struct ll_sb_info *);
  36 int ll_read_inode2(struct inode *inode, void *opaque);
  37
  38 extern void ll_proc_namespace(struct super_block* sb, char* osc, char* mdc)
  39
  40 static char *ll_read_opt(const char *opt, char *data)
  41 {
  42         char *value;
  43         char *retval;
  44         ENTRY;
  45
  46         CDEBUG(D_SUPER, "option: %s, data %s\n", opt, data);
  47         if ( strncmp(opt, data, strlen(opt)) )
  48                 RETURN(NULL);
  49         if ( (value = strchr(data, '=')) == NULL )
  50                 RETURN(NULL);
  51
  52         value++;
  53         OBD_ALLOC(retval, strlen(value) + 1);
  54         if ( !retval ) {
  55                 CERROR("out of memory!\n");
  56                 RETURN(NULL);
  57         }
  58
  59         memcpy(retval, value, strlen(value)+1);
  60         CDEBUG(D_SUPER, "Assigned option: %s, value %s\n", opt, retval);
  61         RETURN(retval);
  62 }
  63
  64 static int ll_set_opt(const char *opt, char *data, int fl)
  65 {
  66         ENTRY;
  67
  68         CDEBUG(D_SUPER, "option: %s, data %s\n", opt, data);
  69         if ( strncmp(opt, data, strlen(opt)) )
  70                 RETURN(0);
  71         else
  72                 RETURN(fl);
  73 }
  74
  75 static void ll_options(char *options, char **ost, char **mds, int *flags)
  76 {
  77         char *opt_ptr = options;
  78         char *this_char;
  79         ENTRY;
  80
  81         if (!options) {
  82                 EXIT;
  83                 return;
  84         }
  85
  86         while ((this_char = strsep (&opt_ptr, ",")) != NULL) {
  87                 CDEBUG(D_SUPER, "this_char %s\n", this_char);
  88                 if ( (!*ost && (*ost = ll_read_opt("osc", this_char)))||
  89                      (!*mds && (*mds = ll_read_opt("mdc", this_char)))||
  90                      (!(*flags & LL_SBI_NOLCK) && ((*flags) = (*flags) |
  91                       ll_set_opt("nolock", this_char, LL_SBI_NOLCK))) )
  92                         continue;
  93         }
  94         EXIT;
  95 }
  96
  97 #ifndef log2
  98 #define log2(n) ffz(~(n))
  99 #endif
 100
 101
 102 static int ll_fill_super(struct super_block *sb, void *data, int silent)
 103 {
 104         struct inode *root = 0;
 105         struct obd_device *obd;
 106         struct ll_sb_info *sbi;
 107         char *osc = NULL;
 108         char *mdc = NULL;
 109         int err;
 110         struct ll_fid rootfid;
 111         struct obd_statfs osfs;
 112         struct ptlrpc_request *request = NULL;
 113         struct ptlrpc_connection *mdc_conn;
 114         struct ll_read_inode2_cookie lic;
 115         class_uuid_t uuid;
 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(-ENOMEM);
 124         }
 125
 126         INIT_LIST_HEAD(&sbi->ll_conn_chain);
 127         generate_random_uuid(uuid);
 128         class_uuid_unparse(uuid, sbi->ll_sb_uuid);
 129
 130         sb->s_fs_info = sbi;
 131
 132         ll_options(data, &osc, &mdc, &sbi->ll_flags);
 133
 134         if (!osc) {
 135                 CERROR("no osc\n");
 136                 GOTO(out_free, sb = NULL);
 137         }
 138
 139         if (!mdc) {
 140                 CERROR("no mdc\n");
 141                 GOTO(out_free, sb = NULL);
 142         }
 143
 144         obd = class_uuid2obd(mdc);
 145         if (!obd) {
 146                 CERROR("MDC %s: not setup or attached\n", mdc);
 147                 GOTO(out_free, sb = NULL);
 148         }
 149
 150         err = obd_connect(&sbi->ll_mdc_conn, obd, sbi->ll_sb_uuid,
 151                           ptlrpc_recovd, ll_recover);
 152         if (err) {
 153                 CERROR("cannot connect to %s: rc = %d\n", mdc, err);
 154                 GOTO(out_free, sb = NULL);
 155         }
 156
 157 #warning Peter: is this the right place to raise the connection level?
 158         mdc_conn = sbi2mdc(sbi)->cl_import.imp_connection;
 159         mdc_conn->c_level = LUSTRE_CONN_FULL;
 160         list_add(&mdc_conn->c_sb_chain, &sbi->ll_conn_chain);
 161
 162         obd = class_uuid2obd(osc);
 163         if (!obd) {
 164                 CERROR("OSC %s: not setup or attached\n", osc);
 165                 GOTO(out_mdc, sb = NULL);
 166         }
 167
 168         err = obd_connect(&sbi->ll_osc_conn, obd, sbi->ll_sb_uuid,
 169                           ptlrpc_recovd, ll_recover);
 170         if (err) {
 171                 CERROR("cannot connect to %s: rc = %d\n", osc, err);
 172                 GOTO(out_mdc, sb = NULL);
 173         }
 174
 175         err = mdc_getstatus(&sbi->ll_mdc_conn, &rootfid);
 176         if (err) {
 177                 CERROR("cannot mds_connect: rc = %d\n", err);
 178                 GOTO(out_mdc, sb = NULL);
 179         }
 180         CDEBUG(D_SUPER, "rootfid "LPU64"\n", rootfid.id);
 181         sbi->ll_rootino = rootfid.id;
 182
 183         memset(&osfs, 0, sizeof(osfs));
 184         err = mdc_statfs(&sbi->ll_mdc_conn, &osfs);
 185         sb->s_blocksize = osfs.os_bsize;
 186         sb->s_blocksize_bits = log2(osfs.os_bsize);
 187         sb->s_magic = LL_SUPER_MAGIC;
 188         sb->s_maxbytes = (1ULL << (32 + 9)) - osfs.os_bsize;
 189
 190         sb->s_op = &ll_super_operations;
 191
 192         /* make root inode */
 193         err = mdc_getattr(&sbi->ll_mdc_conn, sbi->ll_rootino, S_IFDIR,
 194                           OBD_MD_FLNOTOBD|OBD_MD_FLBLOCKS, 0, &request);
 195         if (err) {
 196                 CERROR("mdc_getattr failed for root: rc = %d\n", err);
 197                 GOTO(out_request, sb = NULL);
 198         }
 199
 200         /* initialize committed transaction callback daemon */
 201         spin_lock_init(&sbi->ll_commitcbd_lock);
 202         init_waitqueue_head(&sbi->ll_commitcbd_waitq);
 203         init_waitqueue_head(&sbi->ll_commitcbd_ctl_waitq);
 204         sbi->ll_commitcbd_flags = 0;
 205         err = ll_commitcbd_setup(sbi);
 206         if (err) {
 207                 CERROR("failed to start commit callback daemon: rc = %d\n",err);
 208                 GOTO(out_request, sb = NULL);
 209         }
 210
 211         lic.lic_body = lustre_msg_buf(request->rq_repmsg, 0);
 212         lic.lic_lmm = NULL;
 213         root = iget5_locked(sb, sbi->ll_rootino, NULL,
 214                             ll_read_inode2, &lic);
 215
 216         if (root) {
 217                 sb->s_root = d_alloc_root(root);
 218         } else {
 219                 CERROR("lustre_lite: bad iget4 for root\n");
 220                 GOTO(out_cdb, sb = NULL);
 221         }
 222
 223         ptlrpc_req_finished(request);
 224         request = NULL;
 225         ll_proc_namespace(sb, osc, mdc)
 226 out_dev:
 227         if (mdc)
 228                 OBD_FREE(mdc, strlen(mdc) + 1);
 229         if (osc)
 230                 OBD_FREE(osc, strlen(osc) + 1);
 231
 232         RETURN(0);
 233
 234 out_cdb:
 235         ll_commitcbd_cleanup(sbi);
 236 out_request:
 237         ptlrpc_req_finished(request);
 238         obd_disconnect(&sbi->ll_osc_conn);
 239 out_mdc:
 240         obd_disconnect(&sbi->ll_mdc_conn);
 241 out_free:
 242         OBD_FREE(sbi, sizeof(*sbi));
 243
 244         MOD_DEC_USE_COUNT;
 245         goto out_dev;
 246 } /* ll_fill_super */
 247
 248 struct super_block * ll_get_sb(struct file_system_type *fs_type,
 249                                    int flags, char *devname, void * data)
 250 {
 251         return get_sb_nodev(fs_type, flags, data, ll_fill_super);
 252 }
 253
 254 static void ll_put_super(struct super_block *sb)
 255 {
 256         struct ll_sb_info *sbi = ll_s2sbi(sb);
 257         struct ll_fid rootfid;
 258         ENTRY;
 259
 260         list_del(&sbi->ll_conn_chain);
 261         ll_commitcbd_cleanup(sbi);
 262         obd_disconnect(&sbi->ll_osc_conn);
 263
 264         /* NULL request to force sync on the MDS, and get the last_committed
 265          * value to flush remaining RPCs from the pending queue on client.
 266          *
 267          * XXX This should be an mdc_sync() call to sync the whole MDS fs,
 268          *     which we can call for other reasons as well.
 269          */
 270         mdc_getstatus(&sbi->ll_mdc_conn, &rootfid);
 271
 272         lprocfs_dereg_mnt(sbi->ll_proc_root);
 273         sbi->ll_proc_root=0;
 274
 275         obd_disconnect(&sbi->ll_mdc_conn);
 276         OBD_FREE(sbi, sizeof(*sbi));
 277
 278         MOD_DEC_USE_COUNT;
 279         EXIT;
 280 } /* ll_put_super */
 281
 282 static void ll_clear_inode(struct inode *inode)
 283 {
 284         ENTRY;
 285
 286         if (atomic_read(&inode->i_count) == 0) {
 287                 struct ll_inode_info *lli = ll_i2info(inode);
 288                 struct lov_stripe_md *lsm = lli->lli_smd;
 289                 char *symlink_name = lli->lli_symlink_name;
 290
 291                 if (lsm) {
 292                         OBD_FREE(lsm, ll_ost_easize(inode->i_sb));
 293                         lli->lli_smd = NULL;
 294                 }
 295                 if (symlink_name) {
 296                         OBD_FREE(symlink_name, strlen(symlink_name) + 1);
 297                         lli->lli_symlink_name = NULL;
 298                 }
 299         }
 300         EXIT;
 301 }
 302
 303 static void ll_delete_inode(struct inode *inode)
 304 {
 305         ENTRY;
 306         if (S_ISREG(inode->i_mode)) {
 307                 int err;
 308                 struct obdo *oa;
 309                 struct lov_stripe_md *lsm = ll_i2info(inode)->lli_smd;
 310
 311                 if (!lsm)
 312                         GOTO(out, -EINVAL);
 313
 314                 if (lsm->lsm_object_id == 0) {
 315                         CERROR("This really happens\n");
 316                         /* No obdo was ever created */
 317                         GOTO(out, 0);
 318                 }
 319
 320                 oa = obdo_alloc();
 321                 if (oa == NULL)
 322                         GOTO(out, -ENOMEM);
 323
 324                 oa->o_id = lsm->lsm_object_id;
 325                 oa->o_easize = ll_mds_easize(inode->i_sb);
 326                 oa->o_mode = inode->i_mode;
 327                 oa->o_valid = OBD_MD_FLID | OBD_MD_FLEASIZE | OBD_MD_FLTYPE;
 328
 329                 err = obd_destroy(ll_i2obdconn(inode), oa, lsm);
 330                 obdo_free(oa);
 331                 CDEBUG(D_SUPER, "obd destroy of objid "LPX64" error %d\n",
 332                        lsm->lsm_object_id, err);
 333         }
 334 out:
 335         clear_inode(inode);
 336         EXIT;
 337 }
 338
 339 /* like inode_setattr, but doesn't mark the inode dirty */
 340 static int ll_attr2inode(struct inode * inode, struct iattr * attr, int trunc)
 341 {
 342         unsigned int ia_valid = attr->ia_valid;
 343         int error = 0;
 344
 345         if ((ia_valid & ATTR_SIZE) && trunc) {
 346                 error = vmtruncate(inode, attr->ia_size);
 347                 if (error)
 348                         goto out;
 349         } else if (ia_valid & ATTR_SIZE)
 350                 inode->i_size = attr->ia_size;
 351
 352         if (ia_valid & ATTR_UID)
 353                 inode->i_uid = attr->ia_uid;
 354         if (ia_valid & ATTR_GID)
 355                 inode->i_gid = attr->ia_gid;
 356         if (ia_valid & ATTR_ATIME)
 357                 inode->i_atime = attr->ia_atime;
 358         if (ia_valid & ATTR_MTIME)
 359                 inode->i_mtime = attr->ia_mtime;
 360         if (ia_valid & ATTR_CTIME)
 361                 inode->i_ctime = attr->ia_ctime;
 362         if (ia_valid & ATTR_MODE) {
 363                 inode->i_mode = attr->ia_mode;
 364                 if (!in_group_p(inode->i_gid) && !capable(CAP_FSETID))
 365                         inode->i_mode &= ~S_ISGID;
 366         }
 367 out:
 368         return error;
 369 }
 370
 371 int ll_inode_setattr(struct inode *inode, struct iattr *attr, int do_trunc)
 372 {
 373         struct ptlrpc_request *request = NULL;
 374         struct ll_sb_info *sbi = ll_i2sbi(inode);
 375         int err;
 376
 377         ENTRY;
 378
 379         /* change incore inode */
 380         ll_attr2inode(inode, attr, do_trunc);
 381
 382         err = mdc_setattr(&sbi->ll_mdc_conn, inode, attr, &request);
 383         if (err)
 384                 CERROR("mdc_setattr fails (%d)\n", err);
 385
 386         ptlrpc_req_finished(request);
 387
 388         RETURN(err);
 389 }
 390
 391 int ll_setattr(struct dentry *de, struct iattr *attr)
 392 {
 393         int rc = inode_change_ok(de->d_inode, attr);
 394
 395         if (rc)
 396                 return rc;
 397
 398         return ll_inode_setattr(de->d_inode, attr, 1);
 399 }
 400
 401 static int ll_statfs(struct super_block *sb, struct statfs *sfs)
 402 {
 403         struct ll_sb_info *sbi = ll_s2sbi(sb);
 404         struct obd_statfs osfs;
 405         int rc;
 406         ENTRY;
 407
 408         memset(sfs, 0, sizeof(*sfs));
 409         rc = obd_statfs(&sbi->ll_mdc_conn, &osfs);
 410         statfs_unpack(sfs, &osfs);
 411         if (rc)
 412                 CERROR("mdc_statfs fails: rc = %d\n", rc);
 413         else
 414                 CDEBUG(D_SUPER, "mdc_statfs shows blocks "LPU64"/"LPU64
 415                        " objects "LPU64"/"LPU64"\n",
 416                        osfs.os_bavail, osfs.os_blocks,
 417                        osfs.os_ffree, osfs.os_files);
 418
 419         /* temporary until mds_statfs returns statfs info for all OSTs */
 420         if (!rc) {
 421                 rc = obd_statfs(&sbi->ll_osc_conn, &osfs);
 422                 if (rc) {
 423                         CERROR("obd_statfs fails: rc = %d\n", rc);
 424                         GOTO(out, rc);
 425                 }
 426                 CDEBUG(D_SUPER, "obd_statfs shows blocks "LPU64"/"LPU64
 427                        " objects "LPU64"/"LPU64"\n",
 428                        osfs.os_bavail, osfs.os_blocks,
 429                        osfs.os_ffree, osfs.os_files);
 430
 431                 while (osfs.os_blocks > ~0UL) {
 432                         sfs->f_bsize <<= 1;
 433
 434                         osfs.os_blocks >>= 1;
 435                         osfs.os_bfree >>= 1;
 436                         osfs.os_bavail >>= 1;
 437                 }
 438                 sfs->f_blocks = osfs.os_blocks;
 439                 sfs->f_bfree = osfs.os_bfree;
 440                 sfs->f_bavail = osfs.os_bavail;
 441                 if (osfs.os_ffree < (__u64)sfs->f_ffree)
 442                         sfs->f_ffree = osfs.os_ffree;
 443         }
 444
 445 out:
 446         RETURN(rc);
 447 }
 448
 449 void ll_update_inode(struct inode *inode, struct mds_body *body)
 450 {
 451         if (body->valid & OBD_MD_FLID)
 452                 inode->i_ino = body->ino;
 453         if (body->valid & OBD_MD_FLATIME)
 454                 inode->i_atime = body->atime;
 455         if (body->valid & OBD_MD_FLMTIME)
 456                 inode->i_mtime = body->mtime;
 457         if (body->valid & OBD_MD_FLCTIME)
 458                 inode->i_ctime = body->ctime;
 459         if (body->valid & OBD_MD_FLMODE)
 460                 inode->i_mode = (inode->i_mode & S_IFMT)|(body->mode & ~S_IFMT);
 461         if (body->valid & OBD_MD_FLTYPE)
 462                 inode->i_mode = (inode->i_mode & ~S_IFMT)|(body->mode & S_IFMT);
 463         if (body->valid & OBD_MD_FLUID)
 464                 inode->i_uid = body->uid;
 465         if (body->valid & OBD_MD_FLGID)
 466                 inode->i_gid = body->gid;
 467         if (body->valid & OBD_MD_FLFLAGS)
 468                 inode->i_flags = body->flags;
 469         if (body->valid & OBD_MD_FLNLINK)
 470                 inode->i_nlink = body->nlink;
 471         if (body->valid & OBD_MD_FLGENER)
 472                 inode->i_generation = body->generation;
 473         if (body->valid & OBD_MD_FLRDEV)
 474                 inode->i_rdev = to_kdev_t(body->rdev);
 475         if (body->valid & OBD_MD_FLSIZE)
 476                 inode->i_size = body->size;
 477 }
 478
 479 int ll_read_inode2(struct inode *inode, void *opaque)
 480 {
 481         struct ll_read_inode2_cookie *lic = opaque;
 482         struct mds_body *body = lic->lic_body;
 483         struct ll_inode_info *lli = ll_i2info(inode);
 484         ENTRY;
 485
 486         sema_init(&lli->lli_open_sem, 1);
 487
 488         /* core attributes first */
 489         ll_update_inode(inode, body);
 490
 491         //if (body->valid & OBD_MD_FLEASIZE)
 492         if (lic && lic->lic_lmm) {
 493                 struct lov_mds_md *lmm = lic->lic_lmm;
 494                 int size;
 495
 496                 /* XXX This should probably not be an error in the future,
 497                  *     when we allow LOV OSTs to be added.
 498                  */
 499                 if (lmm->lmm_easize != ll_mds_easize(inode->i_sb)) {
 500                         CERROR("Striping metadata size error %ld\n",
 501                                inode->i_ino);
 502                         LBUG();
 503                 }
 504                 size = ll_ost_easize(inode->i_sb);
 505                 OBD_ALLOC(lli->lli_smd, size);
 506                 if (!lli->lli_smd) {
 507                         CERROR("No memory for %d\n", size);
 508                         LBUG();
 509                 }
 510                 lov_unpackmd(lli->lli_smd, lmm);
 511         } else {
 512                 lli->lli_smd = NULL;
 513         }
 514
 515         /* Get the authoritative file size */
 516         if (lli->lli_smd && (inode->i_mode & S_IFREG)) {
 517                 int rc;
 518
 519                 rc = ll_file_size(inode, lli->lli_smd);
 520                 if (rc) {
 521                         CERROR("ll_file_size: %d\n", rc);
 522                         /* FIXME: need to somehow prevent inode creation */
 523                         LBUG();
 524                 }
 525         }
 526
 527         /* OIDEBUG(inode); */
 528
 529         if (S_ISREG(inode->i_mode)) {
 530                 inode->i_op = &ll_file_inode_operations;
 531                 inode->i_fop = &ll_file_operations;
 532                 inode->i_mapping->a_ops = &ll_aops;
 533                 EXIT;
 534         } else if (S_ISDIR(inode->i_mode)) {
 535                 inode->i_op = &ll_dir_inode_operations;
 536                 inode->i_fop = &ll_dir_operations;
 537                 inode->i_mapping->a_ops = &ll_dir_aops;
 538                 EXIT;
 539         } else if (S_ISLNK(inode->i_mode)) {
 540                 inode->i_op = &ll_fast_symlink_inode_operations;
 541                 EXIT;
 542         } else {
 543                 init_special_inode(inode, inode->i_mode,
 544                                    kdev_t_to_nr(inode->i_rdev));
 545                 EXIT;
 546         }
 547         return 0;
 548 }
 549
 550 static inline void invalidate_request_list(struct list_head *req_list)
 551 {
 552         struct list_head *tmp, *n;
 553         list_for_each_safe(tmp, n, req_list) {
 554                 struct ptlrpc_request *req =
 555                         list_entry(tmp, struct ptlrpc_request, rq_list);
 556                 CERROR("invalidating req xid %d op %d to %s:%d\n",
 557                        (unsigned long long)req->rq_xid, req->rq_reqmsg->opc,
 558                        req->rq_connection->c_remote_uuid,
 559                        req->rq_import->imp_client->cli_request_portal);
 560                 req->rq_flags |= PTL_RPC_FL_ERR;
 561                 wake_up(&req->rq_wait_for_rep);
 562         }
 563 }
 564
 565 void ll_umount_begin(struct super_block *sb)
 566 {
 567         struct ll_sb_info *sbi = ll_s2sbi(sb);
 568         struct list_head *ctmp;
 569
 570         ENTRY;
 571
 572         list_for_each(ctmp, &sbi->ll_conn_chain) {
 573                 struct ptlrpc_connection *conn;
 574                 conn = list_entry(ctmp, struct ptlrpc_connection, c_sb_chain);
 575
 576                 spin_lock(&conn->c_lock);
 577                 conn->c_flags |= CONN_INVALID;
 578                 invalidate_request_list(&conn->c_sending_head);
 579                 invalidate_request_list(&conn->c_delayed_head);
 580                 spin_unlock(&conn->c_lock);
 581         }
 582
 583         EXIT;
 584 }
 585
 586
 587 static kmem_cache_t *ll_inode_cachep;
 588
 589 static struct inode *ll_alloc_inode(struct super_block *sb)
 590 {
 591         struct ll_inode_info *lli;
 592         lli = kmem_cache_alloc(ll_inode_cachep, SLAB_KERNEL);
 593         if (!lli)
 594                 return NULL;
 595
 596         memset(lli, 0, (char *)&lli->lli_vfs_inode - (char *)lli);
 597         sema_init(&lli->lli_open_sem, 1);
 598
 599         return &lli->lli_vfs_inode;
 600 }
 601
 602 static void ll_destroy_inode(struct inode *inode)
 603 {
 604         kmem_cache_free(ll_inode_cachep, ll_i2info(inode));
 605 }
 606
 607 static void init_once(void * foo, kmem_cache_t * cachep, unsigned long flags)
 608 {
 609         struct ll_inode_info *lli = foo;
 610
 611         if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
 612             SLAB_CTOR_CONSTRUCTOR)
 613                 inode_init_once(&lli->lli_vfs_inode);
 614 }
 615
 616 int ll_init_inodecache(void)
 617 {
 618         ll_inode_cachep = kmem_cache_create("lustre_inode_cache",
 619                                             sizeof(struct ll_inode_info),
 620                                             0, SLAB_HWCACHE_ALIGN,
 621                                             init_once, NULL);
 622         if (ll_inode_cachep == NULL)
 623                 return -ENOMEM;
 624         return 0;
 625 }
 626
 627 void ll_destroy_inodecache(void)
 628 {
 629         if (kmem_cache_destroy(ll_inode_cachep))
 630                 CERROR("ll_inode_cache: not all structures were freed\n");
 631 }
 632
 633
 634
 635 /* exported operations */
 636 struct super_operations ll_super_operations =
 637 {
 638         alloc_inode: ll_alloc_inode,
 639         destroy_inode: ll_destroy_inode,
 640         clear_inode: ll_clear_inode,
 641         delete_inode: ll_delete_inode,
 642         put_super: ll_put_super,
 643         statfs: ll_statfs,
 644         umount_begin: ll_umount_begin
 645 };
 646
 647 struct file_system_type lustre_lite_fs_type = {
 648         .owner  = THIS_MODULE,
 649         .name =   "lustre_lite",
 650         .get_sb = ll_get_sb,
 651         .kill_sb = kill_litter_super,
 652 };
 653
 654 static int __init init_lustre_lite(void)
 655 {
 656         int rc;
 657         printk(KERN_INFO "Lustre Lite 0.5.14, info@clusterfs.com\n");
 658         rc = ll_init_inodecache();
 659         if (rc)
 660                 return -ENOMEM;
 661         ll_file_data_slab = kmem_cache_create("ll_file_data",
 662                                               sizeof(struct ll_file_data), 0,
 663                                               SLAB_HWCACHE_ALIGN, NULL, NULL);
 664         if (ll_file_data_slab == NULL) {
 665                 ll_destroy_inodecache();
 666                 return -ENOMEM;
 667         }
 668         return register_filesystem(&lustre_lite_fs_type);
 669 }
 670
 671 static void __exit exit_lustre_lite(void)
 672 {
 673         unregister_filesystem(&lustre_lite_fs_type);
 674         ll_destroy_inodecache();
 675         kmem_cache_destroy(ll_file_data_slab);
 676 }
 677
 678 MODULE_AUTHOR("Cluster File Systems, Inc. <info@clusterfs.com>");
 679 MODULE_DESCRIPTION("Lustre Lite Client File System v1.0");
 680 MODULE_LICENSE("GPL");
 681
 682 module_init(init_lustre_lite);
 683 module_exit(exit_lustre_lite);
 684 #endif