lustre/llite/super25.c

   1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
   2  * vim:expandtab:shiftwidth=8:tabstop=8:
   3  *
   4  * Lustre Light Super operations
   5  *
   6  * This code is issued under the GNU General Public License.
   7  * See the file COPYING in this distribution
   8  *
   9  * Copryright (C) 2002 Cluster File Systems, Inc.
  10  */
  11
  12 #define DEBUG_SUBSYSTEM S_LLITE
  13
  14 #include <linux/module.h>
  15 #include <linux/random.h>
  16 #include <linux/version.h>
  17 #include <linux/lustre_lite.h>
  18 #include <linux/lustre_ha.h>
  19 #include <linux/obd_lov.h>
  20 #include <linux/lustre_dlm.h>
  21 #include <linux/init.h>
  22 #include <linux/fs.h>
  23
  24 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
  25 kmem_cache_t *ll_file_data_slab;
  26 extern struct address_space_operations ll_aops;
  27 extern struct address_space_operations ll_dir_aops;
  28 struct super_operations ll_super_operations;
  29
  30 extern int ll_init_inodecache(void);
  31 extern void ll_destroy_inodecache(void);
  32 extern int ll_recover(struct recovd_data *, int);
  33 extern int ll_commitcbd_setup(struct ll_sb_info *);
  34 extern int ll_commitcbd_cleanup(struct ll_sb_info *);
  35 int ll_read_inode2(struct inode *inode, void *opaque);
  36
  37 static char *ll_read_opt(const char *opt, char *data)
  38 {
  39         char *value;
  40         char *retval;
  41         ENTRY;
  42
  43         CDEBUG(D_SUPER, "option: %s, data %s\n", opt, data);
  44         if ( strncmp(opt, data, strlen(opt)) )
  45                 RETURN(NULL);
  46         if ( (value = strchr(data, '=')) == NULL )
  47                 RETURN(NULL);
  48
  49         value++;
  50         OBD_ALLOC(retval, strlen(value) + 1);
  51         if ( !retval ) {
  52                 CERROR("out of memory!\n");
  53                 RETURN(NULL);
  54         }
  55
  56         memcpy(retval, value, strlen(value)+1);
  57         CDEBUG(D_SUPER, "Assigned option: %s, value %s\n", opt, retval);
  58         RETURN(retval);
  59 }
  60
  61 static int ll_set_opt(const char *opt, char *data, int fl)
  62 {
  63         ENTRY;
  64
  65         CDEBUG(D_SUPER, "option: %s, data %s\n", opt, data);
  66         if ( strncmp(opt, data, strlen(opt)) )
  67                 RETURN(0);
  68         else
  69                 RETURN(fl);
  70 }
  71
  72 static void ll_options(char *options, char **ost, char **mds, int *flags)
  73 {
  74         char *opt_ptr = options;
  75         char *this_char;
  76         ENTRY;
  77
  78         if (!options) {
  79                 EXIT;
  80                 return;
  81         }
  82
  83         while ((this_char = strsep (&opt_ptr, ",")) != NULL) {
  84                 CDEBUG(D_SUPER, "this_char %s\n", this_char);
  85                 if ( (!*ost && (*ost = ll_read_opt("osc", this_char)))||
  86                      (!*mds && (*mds = ll_read_opt("mdc", this_char)))||
  87                      (!(*flags & LL_SBI_NOLCK) && ((*flags) = (*flags) |
  88                       ll_set_opt("nolock", this_char, LL_SBI_NOLCK))) )
  89                         continue;
  90         }
  91         EXIT;
  92 }
  93
  94 #ifndef log2
  95 #define log2(n) ffz(~(n))
  96 #endif
  97
  98
  99 static int ll_fill_super(struct super_block *sb, void *data, int silent)
 100 {
 101         struct inode *root = 0;
 102         struct obd_device *obd;
 103         struct ll_sb_info *sbi;
 104         char *osc = NULL;
 105         char *mdc = NULL;
 106         int err;
 107         struct ll_fid rootfid;
 108         struct obd_statfs osfs;
 109         __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         generate_random_uuid(uuid);
 127         class_uuid_unparse(uuid, sbi->ll_sb_uuid);
 128
 129         sb->s_fs_info = sbi;
 130
 131         ll_options(data, &osc, &mdc, &sbi->ll_flags);
 132
 133         if (!osc) {
 134                 CERROR("no osc\n");
 135                 GOTO(out_free, sb = NULL);
 136         }
 137
 138         if (!mdc) {
 139                 CERROR("no mdc\n");
 140                 GOTO(out_free, sb = NULL);
 141         }
 142
 143         obd = class_uuid2obd(mdc);
 144         if (!obd) {
 145                 CERROR("MDC %s: not setup or attached\n", mdc);
 146                 GOTO(out_free, sb = NULL);
 147         }
 148
 149         err = obd_connect(&sbi->ll_mdc_conn, obd, sbi->ll_sb_uuid,
 150                           ptlrpc_recovd, ll_recover);
 151         if (err) {
 152                 CERROR("cannot connect to %s: rc = %d\n", mdc, err);
 153                 GOTO(out_free, sb = NULL);
 154         }
 155
 156 #warning Peter: is this the right place to raise the connection level?
 157         mdc_conn = sbi2mdc(sbi)->cl_import.imp_connection;
 158         mdc_conn->c_level = LUSTRE_CONN_FULL;
 159         list_add(&mdc_conn->c_sb_chain, &sbi->ll_conn_chain);
 160
 161         obd = class_uuid2obd(osc);
 162         if (!obd) {
 163                 CERROR("OSC %s: not setup or attached\n", osc);
 164                 GOTO(out_mdc, sb = NULL);
 165         }
 166
 167         err = obd_connect(&sbi->ll_osc_conn, obd, sbi->ll_sb_uuid,
 168                           ptlrpc_recovd, ll_recover);
 169         if (err) {
 170                 CERROR("cannot connect to %s: rc = %d\n", osc, err);
 171                 GOTO(out_mdc, sb = NULL);
 172         }
 173
 174         /* XXX: need to store the last_* values somewhere */
 175         err = mdc_getstatus(&sbi->ll_mdc_conn, &rootfid, &last_committed,
 176                             &last_xid, &request);
 177         ptlrpc_req_finished(request);
 178         if (err) {
 179                 CERROR("cannot mds_connect: rc = %d\n", err);
 180                 GOTO(out_mdc, sb = NULL);
 181         }
 182         CDEBUG(D_SUPER, "rootfid %Ld\n", (unsigned long long)rootfid.id);
 183         sbi->ll_rootino = rootfid.id;
 184
 185         memset(&osfs, 0, sizeof(osfs));
 186         request = NULL;
 187         err = mdc_statfs(&sbi->ll_mdc_conn, &osfs, &request);
 188         ptlrpc_req_finished(request);
 189         sb->s_blocksize = osfs.os_bsize;
 190         sb->s_blocksize_bits = log2(osfs.os_bsize);
 191         sb->s_magic = LL_SUPER_MAGIC;
 192         sb->s_maxbytes = (1ULL << (32 + 9)) - osfs.os_bsize;
 193
 194         sb->s_op = &ll_super_operations;
 195
 196         /* make root inode */
 197         request = NULL;
 198         err = mdc_getattr(&sbi->ll_mdc_conn, sbi->ll_rootino, S_IFDIR,
 199                           OBD_MD_FLNOTOBD|OBD_MD_FLBLOCKS, 0, &request);
 200         if (err) {
 201                 CERROR("mdc_getattr failed for root: rc = %d\n", err);
 202                 GOTO(out_request, sb = NULL);
 203         }
 204
 205         /* initialize committed transaction callback daemon */
 206         spin_lock_init(&sbi->ll_commitcbd_lock);
 207         init_waitqueue_head(&sbi->ll_commitcbd_waitq);
 208         init_waitqueue_head(&sbi->ll_commitcbd_ctl_waitq);
 209         sbi->ll_commitcbd_flags = 0;
 210         err = ll_commitcbd_setup(sbi);
 211         if (err) {
 212                 CERROR("failed to start commit callback daemon: rc = %d\n",err);
 213                 GOTO(out_request, sb = NULL);
 214         }
 215
 216         lic.lic_body = lustre_msg_buf(request->rq_repmsg, 0);
 217         lic.lic_lmm = NULL;
 218         root = iget5_locked(sb, sbi->ll_rootino, NULL,
 219                             ll_read_inode2, &lic);
 220
 221         if (root) {
 222                 sb->s_root = d_alloc_root(root);
 223         } else {
 224                 CERROR("lustre_lite: bad iget4 for root\n");
 225                 GOTO(out_cdb, sb = NULL);
 226         }
 227
 228         ptlrpc_req_finished(request);
 229
 230 out_dev:
 231         if (mdc)
 232                 OBD_FREE(mdc, strlen(mdc) + 1);
 233         if (osc)
 234                 OBD_FREE(osc, strlen(osc) + 1);
 235
 236         RETURN(0);
 237
 238 out_cdb:
 239         ll_commitcbd_cleanup(sbi);
 240 out_request:
 241         ptlrpc_req_finished(request);
 242         obd_disconnect(&sbi->ll_osc_conn);
 243 out_mdc:
 244         obd_disconnect(&sbi->ll_mdc_conn);
 245 out_free:
 246         OBD_FREE(sbi, sizeof(*sbi));
 247
 248         MOD_DEC_USE_COUNT;
 249         goto out_dev;
 250 } /* ll_fill_super */
 251
 252 struct super_block * ll_get_sb(struct file_system_type *fs_type,
 253                                    int flags, char *devname, void * data)
 254 {
 255         return get_sb_nodev(fs_type, flags, data, ll_fill_super);
 256 }
 257
 258 static void ll_put_super(struct super_block *sb)
 259 {
 260         struct ll_sb_info *sbi = ll_s2sbi(sb);
 261
 262         ENTRY;
 263         list_del(&sbi->ll_conn_chain);
 264         ll_commitcbd_cleanup(sbi);
 265         obd_disconnect(&sbi->ll_osc_conn);
 266         obd_disconnect(&sbi->ll_mdc_conn);
 267         OBD_FREE(sbi, sizeof(*sbi));
 268
 269         MOD_DEC_USE_COUNT;
 270         EXIT;
 271 } /* ll_put_super */
 272
 273 static void ll_clear_inode(struct inode *inode)
 274 {
 275         ENTRY;
 276
 277         if (atomic_read(&inode->i_count) == 0) {
 278                 struct ll_inode_info *lli = ll_i2info(inode);
 279                 struct lov_stripe_md *lsm = lli->lli_smd;
 280                 char *symlink_name = lli->lli_symlink_name;
 281
 282                 if (lsm) {
 283                         OBD_FREE(lsm, ll_ost_easize(inode->i_sb));
 284                         lli->lli_smd = NULL;
 285                 }
 286                 if (symlink_name) {
 287                         OBD_FREE(symlink_name, strlen(symlink_name) + 1);
 288                         lli->lli_symlink_name = NULL;
 289                 }
 290         }
 291         EXIT;
 292 }
 293
 294 static void ll_delete_inode(struct inode *inode)
 295 {
 296         ENTRY;
 297         if (S_ISREG(inode->i_mode)) {
 298                 int err;
 299                 struct obdo *oa;
 300                 struct lov_stripe_md *lsm = ll_i2info(inode)->lli_smd;
 301
 302                 if (!lsm)
 303                         GOTO(out, -EINVAL);
 304
 305                 if (lsm->lsm_object_id == 0) {
 306                         CERROR("This really happens\n");
 307                         /* No obdo was ever created */
 308                         GOTO(out, 0);
 309                 }
 310
 311                 oa = obdo_alloc();
 312                 if (oa == NULL)
 313                         GOTO(out, -ENOMEM);
 314
 315                 oa->o_id = lsm->lsm_object_id;
 316                 oa->o_easize = ll_mds_easize(inode->i_sb);
 317                 oa->o_mode = inode->i_mode;
 318                 oa->o_valid = OBD_MD_FLID | OBD_MD_FLEASIZE | OBD_MD_FLTYPE;
 319
 320                 err = obd_destroy(ll_i2obdconn(inode), oa, lsm);
 321                 obdo_free(oa);
 322                 CDEBUG(D_SUPER, "obd destroy of objid "LPX64" error %d\n",
 323                        lsm->lsm_object_id, err);
 324         }
 325 out:
 326         clear_inode(inode);
 327         EXIT;
 328 }
 329
 330 /* like inode_setattr, but doesn't mark the inode dirty */
 331 static int ll_attr2inode(struct inode * inode, struct iattr * attr, int trunc)
 332 {
 333         unsigned int ia_valid = attr->ia_valid;
 334         int error = 0;
 335
 336         if ((ia_valid & ATTR_SIZE) && trunc) {
 337                 error = vmtruncate(inode, attr->ia_size);
 338                 if (error)
 339                         goto out;
 340         } else if (ia_valid & ATTR_SIZE)
 341                 inode->i_size = attr->ia_size;
 342
 343         if (ia_valid & ATTR_UID)
 344                 inode->i_uid = attr->ia_uid;
 345         if (ia_valid & ATTR_GID)
 346                 inode->i_gid = attr->ia_gid;
 347         if (ia_valid & ATTR_ATIME)
 348                 inode->i_atime = attr->ia_atime;
 349         if (ia_valid & ATTR_MTIME)
 350                 inode->i_mtime = attr->ia_mtime;
 351         if (ia_valid & ATTR_CTIME)
 352                 inode->i_ctime = attr->ia_ctime;
 353         if (ia_valid & ATTR_MODE) {
 354                 inode->i_mode = attr->ia_mode;
 355                 if (!in_group_p(inode->i_gid) && !capable(CAP_FSETID))
 356                         inode->i_mode &= ~S_ISGID;
 357         }
 358 out:
 359         return error;
 360 }
 361
 362 int ll_inode_setattr(struct inode *inode, struct iattr *attr, int do_trunc)
 363 {
 364         struct ptlrpc_request *request = NULL;
 365         struct ll_sb_info *sbi = ll_i2sbi(inode);
 366         int err;
 367
 368         ENTRY;
 369
 370         /* change incore inode */
 371         ll_attr2inode(inode, attr, do_trunc);
 372
 373         err = mdc_setattr(&sbi->ll_mdc_conn, inode, attr, &request);
 374         if (err)
 375                 CERROR("mdc_setattr fails (%d)\n", err);
 376
 377         ptlrpc_req_finished(request);
 378
 379         RETURN(err);
 380 }
 381
 382 int ll_setattr(struct dentry *de, struct iattr *attr)
 383 {
 384         int rc = inode_change_ok(de->d_inode, attr);
 385
 386         if (rc)
 387                 return rc;
 388
 389         return ll_inode_setattr(de->d_inode, attr, 1);
 390 }
 391
 392 static int ll_statfs(struct super_block *sb, struct statfs *sfs)
 393 {
 394         struct ptlrpc_request *request = NULL;
 395         struct ll_sb_info *sbi = ll_s2sbi(sb);
 396         struct obd_statfs osfs;
 397         int rc;
 398         ENTRY;
 399
 400         memset(sfs, 0, sizeof(*sfs));
 401         rc = mdc_statfs(&sbi->ll_mdc_conn, &osfs, &request);
 402         statfs_unpack(sfs, &osfs);
 403         ptlrpc_req_finished(request);
 404         if (rc)
 405                 CERROR("mdc_statfs fails: rc = %d\n", rc);
 406         else
 407                 CDEBUG(D_SUPER, "mdc_statfs shows blocks "LPU64"/"LPU64
 408                        " objects "LPU64"/"LPU64"\n",
 409                        osfs.os_bavail, osfs.os_blocks,
 410                        osfs.os_ffree, osfs.os_files);
 411
 412         /* temporary until mds_statfs returns statfs info for all OSTs */
 413         if (!rc) {
 414                 rc = obd_statfs(&sbi->ll_osc_conn, &osfs);
 415                 if (rc) {
 416                         CERROR("obd_statfs fails: rc = %d\n", rc);
 417                         GOTO(out, rc);
 418                 }
 419                 CDEBUG(D_SUPER, "obd_statfs shows blocks "LPU64"/"LPU64
 420                        " objects "LPU64"/"LPU64"\n",
 421                        osfs.os_bavail, osfs.os_blocks,
 422                        osfs.os_ffree, osfs.os_files);
 423
 424                 while (osfs.os_blocks > ~0UL) {
 425                         sfs->f_bsize <<= 1;
 426
 427                         osfs.os_blocks >>= 1;
 428                         osfs.os_bfree >>= 1;
 429                         osfs.os_bavail >>= 1;
 430                 }
 431                 sfs->f_blocks = osfs.os_blocks;
 432                 sfs->f_bfree = osfs.os_bfree;
 433                 sfs->f_bavail = osfs.os_bavail;
 434                 if (osfs.os_ffree < (__u64)sfs->f_ffree)
 435                         sfs->f_ffree = osfs.os_ffree;
 436         }
 437
 438 out:
 439         RETURN(rc);
 440 }
 441
 442 void ll_update_inode(struct inode *inode, struct mds_body *body)
 443 {
 444         if (body->valid & OBD_MD_FLID)
 445                 inode->i_ino = body->ino;
 446         if (body->valid & OBD_MD_FLATIME)
 447                 inode->i_atime = body->atime;
 448         if (body->valid & OBD_MD_FLMTIME)
 449                 inode->i_mtime = body->mtime;
 450         if (body->valid & OBD_MD_FLCTIME)
 451                 inode->i_ctime = body->ctime;
 452         if (body->valid & OBD_MD_FLMODE)
 453                 inode->i_mode = (inode->i_mode & S_IFMT)|(body->mode & ~S_IFMT);
 454         if (body->valid & OBD_MD_FLTYPE)
 455                 inode->i_mode = (inode->i_mode & ~S_IFMT)|(body->mode & S_IFMT);
 456         if (body->valid & OBD_MD_FLUID)
 457                 inode->i_uid = body->uid;
 458         if (body->valid & OBD_MD_FLGID)
 459                 inode->i_gid = body->gid;
 460         if (body->valid & OBD_MD_FLFLAGS)
 461                 inode->i_flags = body->flags;
 462         if (body->valid & OBD_MD_FLNLINK)
 463                 inode->i_nlink = body->nlink;
 464         if (body->valid & OBD_MD_FLGENER)
 465                 inode->i_generation = body->generation;
 466         if (body->valid & OBD_MD_FLRDEV)
 467                 inode->i_rdev = to_kdev_t(body->rdev);
 468         if (body->valid & OBD_MD_FLSIZE)
 469                 inode->i_size = body->size;
 470 }
 471
 472 int ll_read_inode2(struct inode *inode, void *opaque)
 473 {
 474         struct ll_read_inode2_cookie *lic = opaque;
 475         struct mds_body *body = lic->lic_body;
 476         struct ll_inode_info *lli = ll_i2info(inode);
 477         ENTRY;
 478
 479         sema_init(&lli->lli_open_sem, 1);
 480
 481         /* core attributes first */
 482         ll_update_inode(inode, body);
 483
 484         //if (body->valid & OBD_MD_FLEASIZE)
 485         if (lic && lic->lic_lmm) {
 486                 struct lov_mds_md *lmm = lic->lic_lmm;
 487                 int size;
 488
 489                 /* XXX This should probably not be an error in the future,
 490                  *     when we allow LOV OSTs to be added.
 491                  */
 492                 if (lmm->lmm_easize != ll_mds_easize(inode->i_sb)) {
 493                         CERROR("Striping metadata size error %ld\n",
 494                                inode->i_ino);
 495                         LBUG();
 496                 }
 497                 size = ll_ost_easize(inode->i_sb);
 498                 OBD_ALLOC(lli->lli_smd, size);
 499                 if (!lli->lli_smd) {
 500                         CERROR("No memory for %d\n", size);
 501                         LBUG();
 502                 }
 503                 lov_unpackmd(lli->lli_smd, lmm);
 504         } else {
 505                 lli->lli_smd = NULL;
 506         }
 507
 508         /* Get the authoritative file size */
 509         if (lli->lli_smd && (inode->i_mode & S_IFREG)) {
 510                 int rc;
 511
 512                 rc = ll_file_size(inode, lli->lli_smd);
 513                 if (rc) {
 514                         CERROR("ll_file_size: %d\n", rc);
 515                         /* FIXME: need to somehow prevent inode creation */
 516                         LBUG();
 517                 }
 518         }
 519
 520         /* OIDEBUG(inode); */
 521
 522         if (S_ISREG(inode->i_mode)) {
 523                 inode->i_op = &ll_file_inode_operations;
 524                 inode->i_fop = &ll_file_operations;
 525                 inode->i_mapping->a_ops = &ll_aops;
 526                 EXIT;
 527         } else if (S_ISDIR(inode->i_mode)) {
 528                 inode->i_op = &ll_dir_inode_operations;
 529                 inode->i_fop = &ll_dir_operations;
 530                 inode->i_mapping->a_ops = &ll_dir_aops;
 531                 EXIT;
 532         } else if (S_ISLNK(inode->i_mode)) {
 533                 inode->i_op = &ll_fast_symlink_inode_operations;
 534                 EXIT;
 535         } else {
 536                 init_special_inode(inode, inode->i_mode,
 537                                    kdev_t_to_nr(inode->i_rdev));
 538                 EXIT;
 539         }
 540         return 0;
 541 }
 542
 543 static inline void invalidate_request_list(struct list_head *req_list)
 544 {
 545         struct list_head *tmp, *n;
 546         list_for_each_safe(tmp, n, req_list) {
 547                 struct ptlrpc_request *req =
 548                         list_entry(tmp, struct ptlrpc_request, rq_list);
 549                 CERROR("invalidating req xid %d op %d to %s:%d\n",
 550                        (unsigned long long)req->rq_xid, req->rq_reqmsg->opc,
 551                        req->rq_connection->c_remote_uuid,
 552                        req->rq_import->imp_client->cli_request_portal);
 553                 req->rq_flags |= PTL_RPC_FL_ERR;
 554                 wake_up(&req->rq_wait_for_rep);
 555         }
 556 }
 557
 558 void ll_umount_begin(struct super_block *sb)
 559 {
 560         struct ll_sb_info *sbi = ll_s2sbi(sb);
 561         struct list_head *ctmp;
 562
 563         ENTRY;
 564
 565         list_for_each(ctmp, &sbi->ll_conn_chain) {
 566                 struct ptlrpc_connection *conn;
 567                 conn = list_entry(ctmp, struct ptlrpc_connection, c_sb_chain);
 568
 569                 spin_lock(&conn->c_lock);
 570                 conn->c_flags |= CONN_INVALID;
 571                 invalidate_request_list(&conn->c_sending_head);
 572                 invalidate_request_list(&conn->c_delayed_head);
 573                 spin_unlock(&conn->c_lock);
 574         }
 575
 576         EXIT;
 577 }
 578
 579
 580 static kmem_cache_t *ll_inode_cachep;
 581
 582 static struct inode *ll_alloc_inode(struct super_block *sb)
 583 {
 584         struct ll_inode_info *lli;
 585         lli = kmem_cache_alloc(ll_inode_cachep, SLAB_KERNEL);
 586         if (!lli)
 587                 return NULL;
 588
 589         memset(lli, 0, (char *)&lli->lli_vfs_inode - (char *)lli);
 590         sema_init(&lli->lli_open_sem, 1);
 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_i2info(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