git.oblomov.eu Git - linux-2.6/blob - fs/qnx4/inode.c

   1 /*
   2  * QNX4 file system, Linux implementation.
   3  *
   4  * Version : 0.2.1
   5  *
   6  * Using parts of the xiafs filesystem.
   7  *
   8  * History :
   9  *
  10  * 01-06-1998 by Richard Frowijn : first release.
  11  * 20-06-1998 by Frank Denis : Linux 2.1.99+ support, boot signature, misc.
  12  * 30-06-1998 by Frank Denis : first step to write inodes.
  13  */
  14
  15 #include <linux/module.h>
  16 #include <linux/types.h>
  17 #include <linux/string.h>
  18 #include <linux/errno.h>
  19 #include <linux/slab.h>
  20 #include <linux/fs.h>
  21 #include <linux/qnx4_fs.h>
  22 #include <linux/init.h>
  23 #include <linux/highuid.h>
  24 #include <linux/smp_lock.h>
  25 #include <linux/pagemap.h>
  26 #include <linux/buffer_head.h>
  27 #include <linux/vfs.h>
  28 #include <asm/uaccess.h>
  29
  30 #define QNX4_VERSION  4
  31 #define QNX4_BMNAME   ".bitmap"
  32
  33 static const struct super_operations qnx4_sops;
  34
  35 #ifdef CONFIG_QNX4FS_RW
  36
  37 int qnx4_sync_inode(struct inode *inode)
  38 {
  39         int err = 0;
  40 # if 0
  41         struct buffer_head *bh;
  42
  43         bh = qnx4_update_inode(inode);
  44         if (bh && buffer_dirty(bh))
  45         {
  46                 sync_dirty_buffer(bh);
  47                 if (buffer_req(bh) && !buffer_uptodate(bh))
  48                 {
  49                         printk ("IO error syncing qnx4 inode [%s:%08lx]\n",
  50                                 inode->i_sb->s_id, inode->i_ino);
  51                         err = -1;
  52                 }
  53                 brelse (bh);
  54         } else if (!bh) {
  55                 err = -1;
  56         }
  57 # endif
  58
  59         return err;
  60 }
  61
  62 static void qnx4_delete_inode(struct inode *inode)
  63 {
  64         QNX4DEBUG(("qnx4: deleting inode [%lu]\n", (unsigned long) inode->i_ino));
  65         truncate_inode_pages(&inode->i_data, 0);
  66         inode->i_size = 0;
  67         qnx4_truncate(inode);
  68         lock_kernel();
  69         qnx4_free_inode(inode);
  70         unlock_kernel();
  71 }
  72
  73 static void qnx4_write_super(struct super_block *sb)
  74 {
  75         lock_kernel();
  76         QNX4DEBUG(("qnx4: write_super\n"));
  77         sb->s_dirt = 0;
  78         unlock_kernel();
  79 }
  80
  81 static int qnx4_write_inode(struct inode *inode, int unused)
  82 {
  83         struct qnx4_inode_entry *raw_inode;
  84         int block, ino;
  85         struct buffer_head *bh;
  86         ino = inode->i_ino;
  87
  88         QNX4DEBUG(("qnx4: write inode 1.\n"));
  89         if (inode->i_nlink == 0) {
  90                 return 0;
  91         }
  92         if (!ino) {
  93                 printk("qnx4: bad inode number on dev %s: %d is out of range\n",
  94                        inode->i_sb->s_id, ino);
  95                 return -EIO;
  96         }
  97         QNX4DEBUG(("qnx4: write inode 2.\n"));
  98         block = ino / QNX4_INODES_PER_BLOCK;
  99         lock_kernel();
 100         if (!(bh = sb_bread(inode->i_sb, block))) {
 101                 printk("qnx4: major problem: unable to read inode from dev "
 102                        "%s\n", inode->i_sb->s_id);
 103                 unlock_kernel();
 104                 return -EIO;
 105         }
 106         raw_inode = ((struct qnx4_inode_entry *) bh->b_data) +
 107             (ino % QNX4_INODES_PER_BLOCK);
 108         raw_inode->di_mode  = cpu_to_le16(inode->i_mode);
 109         raw_inode->di_uid   = cpu_to_le16(fs_high2lowuid(inode->i_uid));
 110         raw_inode->di_gid   = cpu_to_le16(fs_high2lowgid(inode->i_gid));
 111         raw_inode->di_nlink = cpu_to_le16(inode->i_nlink);
 112         raw_inode->di_size  = cpu_to_le32(inode->i_size);
 113         raw_inode->di_mtime = cpu_to_le32(inode->i_mtime.tv_sec);
 114         raw_inode->di_atime = cpu_to_le32(inode->i_atime.tv_sec);
 115         raw_inode->di_ctime = cpu_to_le32(inode->i_ctime.tv_sec);
 116         raw_inode->di_first_xtnt.xtnt_size = cpu_to_le32(inode->i_blocks);
 117         mark_buffer_dirty(bh);
 118         brelse(bh);
 119         unlock_kernel();
 120         return 0;
 121 }
 122
 123 #endif
 124
 125 static void qnx4_put_super(struct super_block *sb);
 126 static struct inode *qnx4_alloc_inode(struct super_block *sb);
 127 static void qnx4_destroy_inode(struct inode *inode);
 128 static int qnx4_remount(struct super_block *sb, int *flags, char *data);
 129 static int qnx4_statfs(struct dentry *, struct kstatfs *);
 130
 131 static const struct super_operations qnx4_sops =
 132 {
 133         .alloc_inode    = qnx4_alloc_inode,
 134         .destroy_inode  = qnx4_destroy_inode,
 135         .put_super      = qnx4_put_super,
 136         .statfs         = qnx4_statfs,
 137         .remount_fs     = qnx4_remount,
 138 #ifdef CONFIG_QNX4FS_RW
 139         .write_inode    = qnx4_write_inode,
 140         .delete_inode   = qnx4_delete_inode,
 141         .write_super    = qnx4_write_super,
 142 #endif
 143 };
 144
 145 static int qnx4_remount(struct super_block *sb, int *flags, char *data)
 146 {
 147         struct qnx4_sb_info *qs;
 148
 149         qs = qnx4_sb(sb);
 150         qs->Version = QNX4_VERSION;
 151 #ifndef CONFIG_QNX4FS_RW
 152         *flags |= MS_RDONLY;
 153 #endif
 154         if (*flags & MS_RDONLY) {
 155                 return 0;
 156         }
 157
 158         mark_buffer_dirty(qs->sb_buf);
 159
 160         return 0;
 161 }
 162
 163 static struct buffer_head *qnx4_getblk(struct inode *inode, int nr,
 164                                        int create)
 165 {
 166         struct buffer_head *result = NULL;
 167
 168         if ( nr >= 0 )
 169                 nr = qnx4_block_map( inode, nr );
 170         if (nr) {
 171                 result = sb_getblk(inode->i_sb, nr);
 172                 return result;
 173         }
 174         if (!create) {
 175                 return NULL;
 176         }
 177 #if 0
 178         tmp = qnx4_new_block(inode->i_sb);
 179         if (!tmp) {
 180                 return NULL;
 181         }
 182         result = sb_getblk(inode->i_sb, tmp);
 183         if (tst) {
 184                 qnx4_free_block(inode->i_sb, tmp);
 185                 brelse(result);
 186                 goto repeat;
 187         }
 188         tst = tmp;
 189 #endif
 190         inode->i_ctime = CURRENT_TIME_SEC;
 191         mark_inode_dirty(inode);
 192         return result;
 193 }
 194
 195 struct buffer_head *qnx4_bread(struct inode *inode, int block, int create)
 196 {
 197         struct buffer_head *bh;
 198
 199         bh = qnx4_getblk(inode, block, create);
 200         if (!bh || buffer_uptodate(bh)) {
 201                 return bh;
 202         }
 203         ll_rw_block(READ, 1, &bh);
 204         wait_on_buffer(bh);
 205         if (buffer_uptodate(bh)) {
 206                 return bh;
 207         }
 208         brelse(bh);
 209
 210         return NULL;
 211 }
 212
 213 static int qnx4_get_block( struct inode *inode, sector_t iblock, struct buffer_head *bh, int create )
 214 {
 215         unsigned long phys;
 216
 217         QNX4DEBUG(("qnx4: qnx4_get_block inode=[%ld] iblock=[%ld]\n",inode->i_ino,iblock));
 218
 219         phys = qnx4_block_map( inode, iblock );
 220         if ( phys ) {
 221                 // logical block is before EOF
 222                 map_bh(bh, inode->i_sb, phys);
 223         } else if ( create ) {
 224                 // to be done.
 225         }
 226         return 0;
 227 }
 228
 229 unsigned long qnx4_block_map( struct inode *inode, long iblock )
 230 {
 231         int ix;
 232         long offset, i_xblk;
 233         unsigned long block = 0;
 234         struct buffer_head *bh = NULL;
 235         struct qnx4_xblk *xblk = NULL;
 236         struct qnx4_inode_entry *qnx4_inode = qnx4_raw_inode(inode);
 237         u16 nxtnt = le16_to_cpu(qnx4_inode->di_num_xtnts);
 238
 239         if ( iblock < le32_to_cpu(qnx4_inode->di_first_xtnt.xtnt_size) ) {
 240                 // iblock is in the first extent. This is easy.
 241                 block = le32_to_cpu(qnx4_inode->di_first_xtnt.xtnt_blk) + iblock - 1;
 242         } else {
 243                 // iblock is beyond first extent. We have to follow the extent chain.
 244                 i_xblk = le32_to_cpu(qnx4_inode->di_xblk);
 245                 offset = iblock - le32_to_cpu(qnx4_inode->di_first_xtnt.xtnt_size);
 246                 ix = 0;
 247                 while ( --nxtnt > 0 ) {
 248                         if ( ix == 0 ) {
 249                                 // read next xtnt block.
 250                                 bh = sb_bread(inode->i_sb, i_xblk - 1);
 251                                 if ( !bh ) {
 252                                         QNX4DEBUG(("qnx4: I/O error reading xtnt block [%ld])\n", i_xblk - 1));
 253                                         return -EIO;
 254                                 }
 255                                 xblk = (struct qnx4_xblk*)bh->b_data;
 256                                 if ( memcmp( xblk->xblk_signature, "IamXblk", 7 ) ) {
 257                                         QNX4DEBUG(("qnx4: block at %ld is not a valid xtnt\n", qnx4_inode->i_xblk));
 258                                         return -EIO;
 259                                 }
 260                         }
 261                         if ( offset < le32_to_cpu(xblk->xblk_xtnts[ix].xtnt_size) ) {
 262                                 // got it!
 263                                 block = le32_to_cpu(xblk->xblk_xtnts[ix].xtnt_blk) + offset - 1;
 264                                 break;
 265                         }
 266                         offset -= le32_to_cpu(xblk->xblk_xtnts[ix].xtnt_size);
 267                         if ( ++ix >= xblk->xblk_num_xtnts ) {
 268                                 i_xblk = le32_to_cpu(xblk->xblk_next_xblk);
 269                                 ix = 0;
 270                                 brelse( bh );
 271                                 bh = NULL;
 272                         }
 273                 }
 274                 if ( bh )
 275                         brelse( bh );
 276         }
 277
 278         QNX4DEBUG(("qnx4: mapping block %ld of inode %ld = %ld\n",iblock,inode->i_ino,block));
 279         return block;
 280 }
 281
 282 static int qnx4_statfs(struct dentry *dentry, struct kstatfs *buf)
 283 {
 284         struct super_block *sb = dentry->d_sb;
 285
 286         lock_kernel();
 287
 288         buf->f_type    = sb->s_magic;
 289         buf->f_bsize   = sb->s_blocksize;
 290         buf->f_blocks  = le32_to_cpu(qnx4_sb(sb)->BitMap->di_size) * 8;
 291         buf->f_bfree   = qnx4_count_free_blocks(sb);
 292         buf->f_bavail  = buf->f_bfree;
 293         buf->f_namelen = QNX4_NAME_MAX;
 294
 295         unlock_kernel();
 296
 297         return 0;
 298 }
 299
 300 /*
 301  * Check the root directory of the filesystem to make sure
 302  * it really _is_ a qnx4 filesystem, and to check the size
 303  * of the directory entry.
 304  */
 305 static const char *qnx4_checkroot(struct super_block *sb)
 306 {
 307         struct buffer_head *bh;
 308         struct qnx4_inode_entry *rootdir;
 309         int rd, rl;
 310         int i, j;
 311         int found = 0;
 312
 313         if (*(qnx4_sb(sb)->sb->RootDir.di_fname) != '/') {
 314                 return "no qnx4 filesystem (no root dir).";
 315         } else {
 316                 QNX4DEBUG(("QNX4 filesystem found on dev %s.\n", sb->s_id));
 317                 rd = le32_to_cpu(qnx4_sb(sb)->sb->RootDir.di_first_xtnt.xtnt_blk) - 1;
 318                 rl = le32_to_cpu(qnx4_sb(sb)->sb->RootDir.di_first_xtnt.xtnt_size);
 319                 for (j = 0; j < rl; j++) {
 320                         bh = sb_bread(sb, rd + j);      /* root dir, first block */
 321                         if (bh == NULL) {
 322                                 return "unable to read root entry.";
 323                         }
 324                         for (i = 0; i < QNX4_INODES_PER_BLOCK; i++) {
 325                                 rootdir = (struct qnx4_inode_entry *) (bh->b_data + i * QNX4_DIR_ENTRY_SIZE);
 326                                 if (rootdir->di_fname != NULL) {
 327                                         QNX4DEBUG(("Rootdir entry found : [%s]\n", rootdir->di_fname));
 328                                         if (!strncmp(rootdir->di_fname, QNX4_BMNAME, sizeof QNX4_BMNAME)) {
 329                                                 found = 1;
 330                                                 qnx4_sb(sb)->BitMap = kmalloc( sizeof( struct qnx4_inode_entry ), GFP_KERNEL );
 331                                                 if (!qnx4_sb(sb)->BitMap) {
 332                                                         brelse (bh);
 333                                                         return "not enough memory for bitmap inode";
 334                                                 }
 335                                                 memcpy( qnx4_sb(sb)->BitMap, rootdir, sizeof( struct qnx4_inode_entry ) );      /* keep bitmap inode known */
 336                                                 break;
 337                                         }
 338                                 }
 339                         }
 340                         brelse(bh);
 341                         if (found != 0) {
 342                                 break;
 343                         }
 344                 }
 345                 if (found == 0) {
 346                         return "bitmap file not found.";
 347                 }
 348         }
 349         return NULL;
 350 }
 351
 352 static int qnx4_fill_super(struct super_block *s, void *data, int silent)
 353 {
 354         struct buffer_head *bh;
 355         struct inode *root;
 356         const char *errmsg;
 357         struct qnx4_sb_info *qs;
 358         int ret = -EINVAL;
 359
 360         qs = kzalloc(sizeof(struct qnx4_sb_info), GFP_KERNEL);
 361         if (!qs)
 362                 return -ENOMEM;
 363         s->s_fs_info = qs;
 364
 365         sb_set_blocksize(s, QNX4_BLOCK_SIZE);
 366
 367         /* Check the superblock signature. Since the qnx4 code is
 368            dangerous, we should leave as quickly as possible
 369            if we don't belong here... */
 370         bh = sb_bread(s, 1);
 371         if (!bh) {
 372                 printk("qnx4: unable to read the superblock\n");
 373                 goto outnobh;
 374         }
 375         if ( le32_to_cpup((__le32*) bh->b_data) != QNX4_SUPER_MAGIC ) {
 376                 if (!silent)
 377                         printk("qnx4: wrong fsid in superblock.\n");
 378                 goto out;
 379         }
 380         s->s_op = &qnx4_sops;
 381         s->s_magic = QNX4_SUPER_MAGIC;
 382 #ifndef CONFIG_QNX4FS_RW
 383         s->s_flags |= MS_RDONLY;        /* Yup, read-only yet */
 384 #endif
 385         qnx4_sb(s)->sb_buf = bh;
 386         qnx4_sb(s)->sb = (struct qnx4_super_block *) bh->b_data;
 387
 388
 389         /* check before allocating dentries, inodes, .. */
 390         errmsg = qnx4_checkroot(s);
 391         if (errmsg != NULL) {
 392                 if (!silent)
 393                         printk("qnx4: %s\n", errmsg);
 394                 goto out;
 395         }
 396
 397         /* does root not have inode number QNX4_ROOT_INO ?? */
 398         root = qnx4_iget(s, QNX4_ROOT_INO * QNX4_INODES_PER_BLOCK);
 399         if (IS_ERR(root)) {
 400                 printk("qnx4: get inode failed\n");
 401                 ret = PTR_ERR(root);
 402                 goto out;
 403         }
 404
 405         ret = -ENOMEM;
 406         s->s_root = d_alloc_root(root);
 407         if (s->s_root == NULL)
 408                 goto outi;
 409
 410         brelse(bh);
 411
 412         return 0;
 413
 414       outi:
 415         iput(root);
 416       out:
 417         brelse(bh);
 418       outnobh:
 419         kfree(qs);
 420         s->s_fs_info = NULL;
 421         return ret;
 422 }
 423
 424 static void qnx4_put_super(struct super_block *sb)
 425 {
 426         struct qnx4_sb_info *qs = qnx4_sb(sb);
 427         kfree( qs->BitMap );
 428         kfree( qs );
 429         sb->s_fs_info = NULL;
 430         return;
 431 }
 432
 433 static int qnx4_writepage(struct page *page, struct writeback_control *wbc)
 434 {
 435         return block_write_full_page(page,qnx4_get_block, wbc);
 436 }
 437
 438 static int qnx4_readpage(struct file *file, struct page *page)
 439 {
 440         return block_read_full_page(page,qnx4_get_block);
 441 }
 442
 443 static int qnx4_write_begin(struct file *file, struct address_space *mapping,
 444                         loff_t pos, unsigned len, unsigned flags,
 445                         struct page **pagep, void **fsdata)
 446 {
 447         struct qnx4_inode_info *qnx4_inode = qnx4_i(mapping->host);
 448         *pagep = NULL;
 449         return cont_write_begin(file, mapping, pos, len, flags, pagep, fsdata,
 450                                 qnx4_get_block,
 451                                 &qnx4_inode->mmu_private);
 452 }
 453 static sector_t qnx4_bmap(struct address_space *mapping, sector_t block)
 454 {
 455         return generic_block_bmap(mapping,block,qnx4_get_block);
 456 }
 457 static const struct address_space_operations qnx4_aops = {
 458         .readpage       = qnx4_readpage,
 459         .writepage      = qnx4_writepage,
 460         .sync_page      = block_sync_page,
 461         .write_begin    = qnx4_write_begin,
 462         .write_end      = generic_write_end,
 463         .bmap           = qnx4_bmap
 464 };
 465
 466 struct inode *qnx4_iget(struct super_block *sb, unsigned long ino)
 467 {
 468         struct buffer_head *bh;
 469         struct qnx4_inode_entry *raw_inode;
 470         int block;
 471         struct qnx4_inode_entry *qnx4_inode;
 472         struct inode *inode;
 473
 474         inode = iget_locked(sb, ino);
 475         if (!inode)
 476                 return ERR_PTR(-ENOMEM);
 477         if (!(inode->i_state & I_NEW))
 478                 return inode;
 479
 480         qnx4_inode = qnx4_raw_inode(inode);
 481         inode->i_mode = 0;
 482
 483         QNX4DEBUG(("Reading inode : [%d]\n", ino));
 484         if (!ino) {
 485                 printk(KERN_ERR "qnx4: bad inode number on dev %s: %lu is "
 486                                 "out of range\n",
 487                        sb->s_id, ino);
 488                 iget_failed(inode);
 489                 return ERR_PTR(-EIO);
 490         }
 491         block = ino / QNX4_INODES_PER_BLOCK;
 492
 493         if (!(bh = sb_bread(sb, block))) {
 494                 printk("qnx4: major problem: unable to read inode from dev "
 495                        "%s\n", sb->s_id);
 496                 iget_failed(inode);
 497                 return ERR_PTR(-EIO);
 498         }
 499         raw_inode = ((struct qnx4_inode_entry *) bh->b_data) +
 500             (ino % QNX4_INODES_PER_BLOCK);
 501
 502         inode->i_mode    = le16_to_cpu(raw_inode->di_mode);
 503         inode->i_uid     = (uid_t)le16_to_cpu(raw_inode->di_uid);
 504         inode->i_gid     = (gid_t)le16_to_cpu(raw_inode->di_gid);
 505         inode->i_nlink   = le16_to_cpu(raw_inode->di_nlink);
 506         inode->i_size    = le32_to_cpu(raw_inode->di_size);
 507         inode->i_mtime.tv_sec   = le32_to_cpu(raw_inode->di_mtime);
 508         inode->i_mtime.tv_nsec = 0;
 509         inode->i_atime.tv_sec   = le32_to_cpu(raw_inode->di_atime);
 510         inode->i_atime.tv_nsec = 0;
 511         inode->i_ctime.tv_sec   = le32_to_cpu(raw_inode->di_ctime);
 512         inode->i_ctime.tv_nsec = 0;
 513         inode->i_blocks  = le32_to_cpu(raw_inode->di_first_xtnt.xtnt_size);
 514
 515         memcpy(qnx4_inode, raw_inode, QNX4_DIR_ENTRY_SIZE);
 516         if (S_ISREG(inode->i_mode)) {
 517                 inode->i_op = &qnx4_file_inode_operations;
 518                 inode->i_fop = &qnx4_file_operations;
 519                 inode->i_mapping->a_ops = &qnx4_aops;
 520                 qnx4_i(inode)->mmu_private = inode->i_size;
 521         } else if (S_ISDIR(inode->i_mode)) {
 522                 inode->i_op = &qnx4_dir_inode_operations;
 523                 inode->i_fop = &qnx4_dir_operations;
 524         } else if (S_ISLNK(inode->i_mode)) {
 525                 inode->i_op = &page_symlink_inode_operations;
 526                 inode->i_mapping->a_ops = &qnx4_aops;
 527                 qnx4_i(inode)->mmu_private = inode->i_size;
 528         } else {
 529                 printk(KERN_ERR "qnx4: bad inode %lu on dev %s\n",
 530                         ino, sb->s_id);
 531                 iget_failed(inode);
 532                 brelse(bh);
 533                 return ERR_PTR(-EIO);
 534         }
 535         brelse(bh);
 536         unlock_new_inode(inode);
 537         return inode;
 538 }
 539
 540 static struct kmem_cache *qnx4_inode_cachep;
 541
 542 static struct inode *qnx4_alloc_inode(struct super_block *sb)
 543 {
 544         struct qnx4_inode_info *ei;
 545         ei = kmem_cache_alloc(qnx4_inode_cachep, GFP_KERNEL);
 546         if (!ei)
 547                 return NULL;
 548         return &ei->vfs_inode;
 549 }
 550
 551 static void qnx4_destroy_inode(struct inode *inode)
 552 {
 553         kmem_cache_free(qnx4_inode_cachep, qnx4_i(inode));
 554 }
 555
 556 static void init_once(void *foo)
 557 {
 558         struct qnx4_inode_info *ei = (struct qnx4_inode_info *) foo;
 559
 560         inode_init_once(&ei->vfs_inode);
 561 }
 562
 563 static int init_inodecache(void)
 564 {
 565         qnx4_inode_cachep = kmem_cache_create("qnx4_inode_cache",
 566                                              sizeof(struct qnx4_inode_info),
 567                                              0, (SLAB_RECLAIM_ACCOUNT|
 568                                                 SLAB_MEM_SPREAD),
 569                                              init_once);
 570         if (qnx4_inode_cachep == NULL)
 571                 return -ENOMEM;
 572         return 0;
 573 }
 574
 575 static void destroy_inodecache(void)
 576 {
 577         kmem_cache_destroy(qnx4_inode_cachep);
 578 }
 579
 580 static int qnx4_get_sb(struct file_system_type *fs_type,
 581         int flags, const char *dev_name, void *data, struct vfsmount *mnt)
 582 {
 583         return get_sb_bdev(fs_type, flags, dev_name, data, qnx4_fill_super,
 584                            mnt);
 585 }
 586
 587 static struct file_system_type qnx4_fs_type = {
 588         .owner          = THIS_MODULE,
 589         .name           = "qnx4",
 590         .get_sb         = qnx4_get_sb,
 591         .kill_sb        = kill_block_super,
 592         .fs_flags       = FS_REQUIRES_DEV,
 593 };
 594
 595 static int __init init_qnx4_fs(void)
 596 {
 597         int err;
 598
 599         err = init_inodecache();
 600         if (err)
 601                 return err;
 602
 603         err = register_filesystem(&qnx4_fs_type);
 604         if (err) {
 605                 destroy_inodecache();
 606                 return err;
 607         }
 608
 609         printk("QNX4 filesystem 0.2.3 registered.\n");
 610         return 0;
 611 }
 612
 613 static void __exit exit_qnx4_fs(void)
 614 {
 615         unregister_filesystem(&qnx4_fs_type);
 616         destroy_inodecache();
 617 }
 618
 619 module_init(init_qnx4_fs)
 620 module_exit(exit_qnx4_fs)
 621 MODULE_LICENSE("GPL");
 622