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 static 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         __u64 last_committed;
 110         __u64 last_xid;
 111         struct ptlrpc_request *request = NULL;
 112         struct ptlrpc_connection *mdc_conn;
 113         struct ll_read_inode2_cookie lic;
 114         class_uuid_t uuid;
 115
 116         ENTRY;
 117         MOD_INC_USE_COUNT;
 118
 119         OBD_ALLOC(sbi, sizeof(*sbi));
 120         if (!sbi) {
 121                 MOD_DEC_USE_COUNT;
 122                 RETURN(-ENOMEM);
 123         }
 124
 125         INIT_LIST_HEAD(&sbi->ll_conn_chain);
 126         sbi->ll_mount_epoch = 0;
 127         generate_random_uuid(uuid);
 128         class_uuid_unparse(uuid, sbi->ll_sb_uuid);
 129
 130         sb->u.generic_sbp = 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         /* XXX: need to store the last_* values somewhere */
 176         err = mdc_getstatus(&sbi->ll_mdc_conn, &rootfid, &last_committed,
 177                             &last_xid, &request);
 178         ptlrpc_req_finished(request);
 179         if (err) {
 180                 CERROR("cannot mds_connect: rc = %d\n", err);
 181                 GOTO(out_mdc, sb = NULL);
 182         }
 183         CDEBUG(D_SUPER, "rootfid %Ld\n", (unsigned long long)rootfid.id);
 184         sbi->ll_rootino = rootfid.id;
 185
 186         memset(&osfs, 0, sizeof(osfs));
 187         request = NULL;
 188         err = mdc_statfs(&sbi->ll_mdc_conn, &osfs, &request);
 189         ptlrpc_req_finished(request);
 190         sb->s_blocksize = osfs.os_bsize;
 191         sb->s_blocksize_bits = log2(osfs.os_bsize);
 192         sb->s_magic = LL_SUPER_MAGIC;
 193         sb->s_maxbytes = (1ULL << (32 + 9)) - osfs.os_bsize;
 194
 195         sb->s_op = &ll_super_operations;
 196
 197         /* make root inode */
 198         request = NULL;
 199         err = mdc_getattr(&sbi->ll_mdc_conn, sbi->ll_rootino, S_IFDIR,
 200                           OBD_MD_FLNOTOBD|OBD_MD_FLBLOCKS, 0, &request);
 201         if (err) {
 202                 CERROR("mdc_getattr failed for root: rc = %d\n", err);
 203                 GOTO(out_request, sb = NULL);
 204         }
 205
 206         /* initialize committed transaction callback daemon */
 207         spin_lock_init(&sbi->ll_commitcbd_lock);
 208         init_waitqueue_head(&sbi->ll_commitcbd_waitq);
 209         init_waitqueue_head(&sbi->ll_commitcbd_ctl_waitq);
 210         sbi->ll_commitcbd_flags = 0;
 211         err = ll_commitcbd_setup(sbi);
 212         if (err) {
 213                 CERROR("failed to start commit callback daemon: rc = %d\n",err);
 214                 GOTO(out_request, sb = NULL);
 215         }
 216
 217         lic.lic_body = lustre_msg_buf(request->rq_repmsg, 0);
 218         lic.lic_lmm = NULL;
 219         root = iget5_locked(sb, sbi->ll_rootino, NULL,
 220                             ll_read_inode2, &lic);
 221
 222         if (root) {
 223                 sb->s_root = d_alloc_root(root);
 224         } else {
 225                 CERROR("lustre_lite: bad iget4 for root\n");
 226                 GOTO(out_cdb, sb = NULL);
 227         }
 228
 229         ptlrpc_req_finished(request);
 230
 231 out_dev:
 232         if (mdc)
 233                 OBD_FREE(mdc, strlen(mdc) + 1);
 234         if (osc)
 235                 OBD_FREE(osc, strlen(osc) + 1);
 236
 237         RETURN(0);
 238
 239 out_cdb:
 240         ll_commitcbd_cleanup(sbi);
 241 out_request:
 242         ptlrpc_req_finished(request);
 243         obd_disconnect(&sbi->ll_osc_conn);
 244 out_mdc:
 245         obd_disconnect(&sbi->ll_mdc_conn);
 246 out_free:
 247         OBD_FREE(sbi, sizeof(*sbi));
 248
 249         MOD_DEC_USE_COUNT;
 250         goto out_dev;
 251 } /* ll_fill_super */
 252
 253 struct super_block * ll_get_sb(struct file_system_type *fs_type,
 254                                    int flags, char *devname, void * data)
 255 {
 256         return get_sb_nodev(fs_type, flags, data, ll_fill_super);
 257 }
 258
 259 static void ll_put_super(struct super_block *sb)
 260 {
 261         struct ll_sb_info *sbi = ll_s2sbi(sb);
 262
 263         ENTRY;
 264         list_del(&sbi->ll_conn_chain);
 265         ll_commitcbd_cleanup(sbi);
 266         obd_disconnect(&sbi->ll_osc_conn);
 267         obd_disconnect(&sbi->ll_mdc_conn);
 268         OBD_FREE(sbi, sizeof(*sbi));
 269
 270         MOD_DEC_USE_COUNT;
 271         EXIT;
 272 } /* ll_put_super */
 273
 274 static void ll_clear_inode(struct inode *inode)
 275 {
 276         ENTRY;
 277
 278         if (atomic_read(&inode->i_count) == 0) {
 279                 struct ll_inode_info *lli = ll_i2info(inode);
 280                 struct lov_stripe_md *lsm = lli->lli_smd;
 281                 char *symlink_name = lli->lli_symlink_name;
 282
 283                 if (lsm) {
 284                         OBD_FREE(lsm, ll_ost_easize(inode->i_sb));
 285                         lli->lli_smd = NULL;
 286                 }
 287                 if (symlink_name) {
 288                         OBD_FREE(symlink_name, strlen(symlink_name) + 1);
 289                         lli->lli_symlink_name = NULL;
 290                 }
 291         }
 292         EXIT;
 293 }
 294
 295 static void ll_delete_inode(struct inode *inode)
 296 {
 297         ENTRY;
 298         if (S_ISREG(inode->i_mode)) {
 299                 int err;
 300                 struct obdo *oa;
 301                 struct lov_stripe_md *lsm = ll_i2info(inode)->lli_smd;
 302
 303                 if (!lsm)
 304                         GOTO(out, -EINVAL);
 305
 306                 if (lsm->lsm_object_id == 0) {
 307                         CERROR("This really happens\n");
 308                         /* No obdo was ever created */
 309                         GOTO(out, 0);
 310                 }
 311
 312                 oa = obdo_alloc();
 313                 if (oa == NULL)
 314                         GOTO(out, -ENOMEM);
 315
 316                 oa->o_id = lsm->lsm_object_id;
 317                 oa->o_easize = ll_mds_easize(inode->i_sb);
 318                 oa->o_mode = inode->i_mode;
 319                 oa->o_valid = OBD_MD_FLID | OBD_MD_FLEASIZE | OBD_MD_FLTYPE;
 320
 321                 err = obd_destroy(ll_i2obdconn(inode), oa, lsm);
 322                 obdo_free(oa);
 323                 CDEBUG(D_SUPER, "obd destroy of objid "LPX64" error %d\n",
 324                        lsm->lsm_object_id, err);
 325         }
 326 out:
 327         clear_inode(inode);
 328         EXIT;
 329 }
 330
 331 /* like inode_setattr, but doesn't mark the inode dirty */
 332 static int ll_attr2inode(struct inode * inode, struct iattr * attr, int trunc)
 333 {
 334         unsigned int ia_valid = attr->ia_valid;
 335         int error = 0;
 336
 337         if ((ia_valid & ATTR_SIZE) && trunc) {
 338                 error = vmtruncate(inode, attr->ia_size);
 339                 if (error)
 340                         goto out;
 341         } else if (ia_valid & ATTR_SIZE)
 342                 inode->i_size = attr->ia_size;
 343
 344         if (ia_valid & ATTR_UID)
 345                 inode->i_uid = attr->ia_uid;
 346         if (ia_valid & ATTR_GID)
 347                 inode->i_gid = attr->ia_gid;
 348         if (ia_valid & ATTR_ATIME)
 349                 inode->i_atime = attr->ia_atime;
 350         if (ia_valid & ATTR_MTIME)
 351                 inode->i_mtime = attr->ia_mtime;
 352         if (ia_valid & ATTR_CTIME)
 353                 inode->i_ctime = attr->ia_ctime;
 354         if (ia_valid & ATTR_MODE) {
 355                 inode->i_mode = attr->ia_mode;
 356                 if (!in_group_p(inode->i_gid) && !capable(CAP_FSETID))
 357                         inode->i_mode &= ~S_ISGID;
 358         }
 359 out:
 360         return error;
 361 }
 362
 363 int ll_inode_setattr(struct inode *inode, struct iattr *attr, int do_trunc)
 364 {
 365         struct ptlrpc_request *request = NULL;
 366         struct ll_sb_info *sbi = ll_i2sbi(inode);
 367         int err;
 368
 369         ENTRY;
 370
 371         /* change incore inode */
 372         ll_attr2inode(inode, attr, do_trunc);
 373
 374         err = mdc_setattr(&sbi->ll_mdc_conn, inode, attr, &request);
 375         if (err)
 376                 CERROR("mdc_setattr fails (%d)\n", err);
 377
 378         ptlrpc_req_finished(request);
 379
 380         RETURN(err);
 381 }
 382
 383 int ll_setattr(struct dentry *de, struct iattr *attr)
 384 {
 385         int rc = inode_change_ok(de->d_inode, attr);
 386
 387         if (rc)
 388                 return rc;
 389
 390         return ll_inode_setattr(de->d_inode, attr, 1);
 391 }
 392
 393 static int ll_statfs(struct super_block *sb, struct statfs *sfs)
 394 {
 395         struct ptlrpc_request *request = NULL;
 396         struct ll_sb_info *sbi = ll_s2sbi(sb);
 397         struct obd_statfs osfs;
 398         int rc;
 399         ENTRY;
 400
 401         memset(sfs, 0, sizeof(*sfs));
 402         rc = mdc_statfs(&sbi->ll_mdc_conn, &osfs, &request);
 403         statfs_unpack(sfs, &osfs);
 404         ptlrpc_req_finished(request);
 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 static 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         lli->lli_mount_epoch = ll_i2sbi(inode)->ll_mount_epoch;
 482
 483         /* core attributes first */
 484         ll_update_inode(inode, body);
 485
 486         //if (body->valid & OBD_MD_FLEASIZE)
 487         if (lic && lic->lic_lmm) {
 488                 struct lov_mds_md *lmm = lic->lic_lmm;
 489                 int size;
 490
 491                 if (lmm->lmm_easize != ll_mds_easize(inode->i_sb)) {
 492                         CERROR("Striping metadata size error %ld\n",
 493                                inode->i_ino);
 494                         LBUG();
 495                 }
 496                 size = ll_ost_easize(inode->i_sb);
 497                 OBD_ALLOC(lli->lli_smd, size);
 498                 if (!lli->lli_smd) {
 499                         CERROR("No memory for %d\n", size);
 500                         LBUG();
 501                 }
 502                 lov_unpackmd(lli->lli_smd, lmm);
 503         } else {
 504                 lli->lli_smd = NULL;
 505         }
 506
 507         /* Get the authoritative file size */
 508         if (lli->lli_smd && (inode->i_mode & S_IFREG)) {
 509                 int rc;
 510
 511                 rc = ll_file_size(inode, lli->lli_smd);
 512                 if (rc) {
 513                         CERROR("ll_file_size: %d\n", rc);
 514                         /* FIXME: need to somehow prevent inode creation */
 515                         LBUG();
 516                 }
 517         }
 518
 519         /* OIDEBUG(inode); */
 520
 521         if (S_ISREG(inode->i_mode)) {
 522                 inode->i_op = &ll_file_inode_operations;
 523                 inode->i_fop = &ll_file_operations;
 524                 inode->i_mapping->a_ops = &ll_aops;
 525                 EXIT;
 526         } else if (S_ISDIR(inode->i_mode)) {
 527                 inode->i_op = &ll_dir_inode_operations;
 528                 inode->i_fop = &ll_dir_operations;
 529                 inode->i_mapping->a_ops = &ll_dir_aops;
 530                 EXIT;
 531         } else if (S_ISLNK(inode->i_mode)) {
 532                 inode->i_op = &ll_fast_symlink_inode_operations;
 533                 EXIT;
 534         } else {
 535                 init_special_inode(inode, inode->i_mode,
 536                                    kdev_t_to_nr(inode->i_rdev));
 537                 EXIT;
 538         }
 539         return 0;
 540 }
 541
 542 static inline void invalidate_request_list(struct list_head *req_list)
 543 {
 544         struct list_head *tmp, *n;
 545         list_for_each_safe(tmp, n, req_list) {
 546                 struct ptlrpc_request *req =
 547                         list_entry(tmp, struct ptlrpc_request, rq_list);
 548                 CERROR("invalidating req xid %d op %d to %s:%d\n",
 549                        (unsigned long long)req->rq_xid, req->rq_reqmsg->opc,
 550                        req->rq_connection->c_remote_uuid,
 551                        req->rq_import->imp_client->cli_request_portal);
 552                 req->rq_flags |= PTL_RPC_FL_ERR;
 553                 wake_up(&req->rq_wait_for_rep);
 554         }
 555 }
 556
 557 void ll_umount_begin(struct super_block *sb)
 558 {
 559         struct ll_sb_info *sbi = ll_s2sbi(sb);
 560         struct list_head *ctmp;
 561
 562         ENTRY;
 563
 564         list_for_each(ctmp, &sbi->ll_conn_chain) {
 565                 struct ptlrpc_connection *conn;
 566                 conn = list_entry(ctmp, struct ptlrpc_connection, c_sb_chain);
 567
 568                 spin_lock(&conn->c_lock);
 569                 conn->c_flags |= CONN_INVALID;
 570                 invalidate_request_list(&conn->c_sending_head);
 571                 invalidate_request_list(&conn->c_delayed_head);
 572                 spin_unlock(&conn->c_lock);
 573         }
 574
 575         EXIT;
 576 }
 577
 578
 579 static kmem_cache_t *ll_inode_cachep;
 580
 581 static struct inode *ll_alloc_inode(struct super_block *sb)
 582 {
 583         struct ll_inode_info *lli;
 584         lli = kmem_cache_alloc(ll_inode_cachep, SLAB_KERNEL);
 585         if (!lli)
 586                 return NULL;
 587
 588         memset(lli, 0, sizeof(*lli));
 589         sema_init(&lli->lli_open_sem, 1);
 590         lli->lli_mount_epoch = ll_i2sbi(&lli->lli_vfs_inode)->ll_mount_epoch;
 591
 592         return &lli->lli_vfs_inode;
 593 }
 594
 595 static void ll_destroy_inode(struct inode *inode)
 596 {
 597         kmem_cache_free(ll_inode_cachep, LL_I(inode));
 598 }
 599
 600 static void init_once(void * foo, kmem_cache_t * cachep, unsigned long flags)
 601 {
 602         struct ll_inode_info *lli = foo;
 603
 604         if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
 605             SLAB_CTOR_CONSTRUCTOR)
 606                 inode_init_once(&lli->lli_vfs_inode);
 607 }
 608
 609 int ll_init_inodecache(void)
 610 {
 611         ll_inode_cachep = kmem_cache_create("lustre_inode_cache",
 612                                              sizeof(struct ll_inode_info),
 613                                              0, SLAB_HWCACHE_ALIGN,
 614                                              init_once, NULL);
 615         if (ll_inode_cachep == NULL)
 616                 return -ENOMEM;
 617         return 0;
 618 }
 619
 620 void ll_destroy_inodecache(void)
 621 {
 622         if (kmem_cache_destroy(ll_inode_cachep))
 623                 CERROR("ll_inode_cache: not all structures were freed\n");
 624 }
 625
 626
 627
 628 /* exported operations */
 629 struct super_operations ll_super_operations =
 630 {
 631         alloc_inode: ll_alloc_inode,
 632         destroy_inode: ll_destroy_inode,
 633         clear_inode: ll_clear_inode,
 634         delete_inode: ll_delete_inode,
 635         put_super: ll_put_super,
 636         statfs: ll_statfs,
 637         umount_begin: ll_umount_begin
 638 };
 639
 640 struct file_system_type lustre_lite_fs_type = {
 641         .owner  = THIS_MODULE,
 642         .name =   "lustre_lite",
 643         .get_sb = ll_get_sb,
 644         .kill_sb = kill_litter_super,
 645 };
 646
 647 static int __init init_lustre_lite(void)
 648 {
 649         int rc;
 650         printk(KERN_INFO "Lustre Lite 0.5.14, info@clusterfs.com\n");
 651         rc = ll_init_inodecache();
 652         if (rc)
 653                 return -ENOMEM;
 654         ll_file_data_slab = kmem_cache_create("ll_file_data",
 655                                               sizeof(struct ll_file_data), 0,
 656                                               SLAB_HWCACHE_ALIGN, NULL, NULL);
 657         if (ll_file_data_slab == NULL) {
 658                 ll_destroy_inodecache();
 659                 return -ENOMEM;
 660         }
 661         return register_filesystem(&lustre_lite_fs_type);
 662 }
 663
 664 static void __exit exit_lustre_lite(void)
 665 {
 666         unregister_filesystem(&lustre_lite_fs_type);
 667         ll_destroy_inodecache();
 668         kmem_cache_destroy(ll_file_data_slab);
 669 }
 670
 671 MODULE_AUTHOR("Cluster File Systems, Inc. <info@clusterfs.com>");
 672 MODULE_DESCRIPTION("Lustre Lite Client File System v1.0");
 673 MODULE_LICENSE("GPL");
 674
 675 module_init(init_lustre_lite);
 676 module_exit(exit_lustre_lite);
 677 #endif