fs/minix/inode.c

   1 /*
   2  *  linux/fs/minix/inode.c
   3  *
   4  *  Copyright (C) 1991, 1992  Linus Torvalds
   5  *
   6  *  Copyright (C) 1996  Gertjan van Wingerde    (gertjan@cs.vu.nl)
   7  *      Minix V2 fs support.
   8  *
   9  *  Modified for 680x0 by Andreas Schwab
  10  */
  11
  12 #include <linux/module.h>
  13 #include "minix.h"
  14 #include <linux/buffer_head.h>
  15 #include <linux/slab.h>
  16 #include <linux/init.h>
  17 #include <linux/highuid.h>
  18 #include <linux/vfs.h>
  19
  20 static void minix_read_inode(struct inode * inode);
  21 static int minix_write_inode(struct inode * inode, int wait);
  22 static int minix_statfs(struct dentry *dentry, struct kstatfs *buf);
  23 static int minix_remount (struct super_block * sb, int * flags, char * data);
  24
  25 static void minix_delete_inode(struct inode *inode)
  26 {
  27         truncate_inode_pages(&inode->i_data, 0);
  28         inode->i_size = 0;
  29         minix_truncate(inode);
  30         minix_free_inode(inode);
  31 }
  32
  33 static void minix_put_super(struct super_block *sb)
  34 {
  35         int i;
  36         struct minix_sb_info *sbi = minix_sb(sb);
  37
  38         if (!(sb->s_flags & MS_RDONLY)) {
  39                 sbi->s_ms->s_state = sbi->s_mount_state;
  40                 mark_buffer_dirty(sbi->s_sbh);
  41         }
  42         for (i = 0; i < sbi->s_imap_blocks; i++)
  43                 brelse(sbi->s_imap[i]);
  44         for (i = 0; i < sbi->s_zmap_blocks; i++)
  45                 brelse(sbi->s_zmap[i]);
  46         brelse (sbi->s_sbh);
  47         kfree(sbi->s_imap);
  48         sb->s_fs_info = NULL;
  49         kfree(sbi);
  50
  51         return;
  52 }
  53
  54 static kmem_cache_t * minix_inode_cachep;
  55
  56 static struct inode *minix_alloc_inode(struct super_block *sb)
  57 {
  58         struct minix_inode_info *ei;
  59         ei = (struct minix_inode_info *)kmem_cache_alloc(minix_inode_cachep, SLAB_KERNEL);
  60         if (!ei)
  61                 return NULL;
  62         return &ei->vfs_inode;
  63 }
  64
  65 static void minix_destroy_inode(struct inode *inode)
  66 {
  67         kmem_cache_free(minix_inode_cachep, minix_i(inode));
  68 }
  69
  70 static void init_once(void * foo, kmem_cache_t * cachep, unsigned long flags)
  71 {
  72         struct minix_inode_info *ei = (struct minix_inode_info *) foo;
  73
  74         if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
  75             SLAB_CTOR_CONSTRUCTOR)
  76                 inode_init_once(&ei->vfs_inode);
  77 }
  78
  79 static int init_inodecache(void)
  80 {
  81         minix_inode_cachep = kmem_cache_create("minix_inode_cache",
  82                                              sizeof(struct minix_inode_info),
  83                                              0, (SLAB_RECLAIM_ACCOUNT|
  84                                                 SLAB_MEM_SPREAD),
  85                                              init_once, NULL);
  86         if (minix_inode_cachep == NULL)
  87                 return -ENOMEM;
  88         return 0;
  89 }
  90
  91 static void destroy_inodecache(void)
  92 {
  93         kmem_cache_destroy(minix_inode_cachep);
  94 }
  95
  96 static struct super_operations minix_sops = {
  97         .alloc_inode    = minix_alloc_inode,
  98         .destroy_inode  = minix_destroy_inode,
  99         .read_inode     = minix_read_inode,
 100         .write_inode    = minix_write_inode,
 101         .delete_inode   = minix_delete_inode,
 102         .put_super      = minix_put_super,
 103         .statfs         = minix_statfs,
 104         .remount_fs     = minix_remount,
 105 };
 106
 107 static int minix_remount (struct super_block * sb, int * flags, char * data)
 108 {
 109         struct minix_sb_info * sbi = minix_sb(sb);
 110         struct minix_super_block * ms;
 111
 112         ms = sbi->s_ms;
 113         if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
 114                 return 0;
 115         if (*flags & MS_RDONLY) {
 116                 if (ms->s_state & MINIX_VALID_FS ||
 117                     !(sbi->s_mount_state & MINIX_VALID_FS))
 118                         return 0;
 119                 /* Mounting a rw partition read-only. */
 120                 ms->s_state = sbi->s_mount_state;
 121                 mark_buffer_dirty(sbi->s_sbh);
 122         } else {
 123                 /* Mount a partition which is read-only, read-write. */
 124                 sbi->s_mount_state = ms->s_state;
 125                 ms->s_state &= ~MINIX_VALID_FS;
 126                 mark_buffer_dirty(sbi->s_sbh);
 127
 128                 if (!(sbi->s_mount_state & MINIX_VALID_FS))
 129                         printk("MINIX-fs warning: remounting unchecked fs, "
 130                                 "running fsck is recommended\n");
 131                 else if ((sbi->s_mount_state & MINIX_ERROR_FS))
 132                         printk("MINIX-fs warning: remounting fs with errors, "
 133                                 "running fsck is recommended\n");
 134         }
 135         return 0;
 136 }
 137
 138 static int minix_fill_super(struct super_block *s, void *data, int silent)
 139 {
 140         struct buffer_head *bh;
 141         struct buffer_head **map;
 142         struct minix_super_block *ms;
 143         int i, block;
 144         struct inode *root_inode;
 145         struct minix_sb_info *sbi;
 146
 147         sbi = kzalloc(sizeof(struct minix_sb_info), GFP_KERNEL);
 148         if (!sbi)
 149                 return -ENOMEM;
 150         s->s_fs_info = sbi;
 151
 152         /* N.B. These should be compile-time tests.
 153            Unfortunately that is impossible. */
 154         if (32 != sizeof (struct minix_inode))
 155                 panic("bad V1 i-node size");
 156         if (64 != sizeof(struct minix2_inode))
 157                 panic("bad V2 i-node size");
 158
 159         if (!sb_set_blocksize(s, BLOCK_SIZE))
 160                 goto out_bad_hblock;
 161
 162         if (!(bh = sb_bread(s, 1)))
 163                 goto out_bad_sb;
 164
 165         ms = (struct minix_super_block *) bh->b_data;
 166         sbi->s_ms = ms;
 167         sbi->s_sbh = bh;
 168         sbi->s_mount_state = ms->s_state;
 169         sbi->s_ninodes = ms->s_ninodes;
 170         sbi->s_nzones = ms->s_nzones;
 171         sbi->s_imap_blocks = ms->s_imap_blocks;
 172         sbi->s_zmap_blocks = ms->s_zmap_blocks;
 173         sbi->s_firstdatazone = ms->s_firstdatazone;
 174         sbi->s_log_zone_size = ms->s_log_zone_size;
 175         sbi->s_max_size = ms->s_max_size;
 176         s->s_magic = ms->s_magic;
 177         if (s->s_magic == MINIX_SUPER_MAGIC) {
 178                 sbi->s_version = MINIX_V1;
 179                 sbi->s_dirsize = 16;
 180                 sbi->s_namelen = 14;
 181                 sbi->s_link_max = MINIX_LINK_MAX;
 182         } else if (s->s_magic == MINIX_SUPER_MAGIC2) {
 183                 sbi->s_version = MINIX_V1;
 184                 sbi->s_dirsize = 32;
 185                 sbi->s_namelen = 30;
 186                 sbi->s_link_max = MINIX_LINK_MAX;
 187         } else if (s->s_magic == MINIX2_SUPER_MAGIC) {
 188                 sbi->s_version = MINIX_V2;
 189                 sbi->s_nzones = ms->s_zones;
 190                 sbi->s_dirsize = 16;
 191                 sbi->s_namelen = 14;
 192                 sbi->s_link_max = MINIX2_LINK_MAX;
 193         } else if (s->s_magic == MINIX2_SUPER_MAGIC2) {
 194                 sbi->s_version = MINIX_V2;
 195                 sbi->s_nzones = ms->s_zones;
 196                 sbi->s_dirsize = 32;
 197                 sbi->s_namelen = 30;
 198                 sbi->s_link_max = MINIX2_LINK_MAX;
 199         } else
 200                 goto out_no_fs;
 201
 202         /*
 203          * Allocate the buffer map to keep the superblock small.
 204          */
 205         if (sbi->s_imap_blocks == 0 || sbi->s_zmap_blocks == 0)
 206                 goto out_illegal_sb;
 207         i = (sbi->s_imap_blocks + sbi->s_zmap_blocks) * sizeof(bh);
 208         map = kzalloc(i, GFP_KERNEL);
 209         if (!map)
 210                 goto out_no_map;
 211         sbi->s_imap = &map[0];
 212         sbi->s_zmap = &map[sbi->s_imap_blocks];
 213
 214         block=2;
 215         for (i=0 ; i < sbi->s_imap_blocks ; i++) {
 216                 if (!(sbi->s_imap[i]=sb_bread(s, block)))
 217                         goto out_no_bitmap;
 218                 block++;
 219         }
 220         for (i=0 ; i < sbi->s_zmap_blocks ; i++) {
 221                 if (!(sbi->s_zmap[i]=sb_bread(s, block)))
 222                         goto out_no_bitmap;
 223                 block++;
 224         }
 225
 226         minix_set_bit(0,sbi->s_imap[0]->b_data);
 227         minix_set_bit(0,sbi->s_zmap[0]->b_data);
 228
 229         /* set up enough so that it can read an inode */
 230         s->s_op = &minix_sops;
 231         root_inode = iget(s, MINIX_ROOT_INO);
 232         if (!root_inode || is_bad_inode(root_inode))
 233                 goto out_no_root;
 234
 235         s->s_root = d_alloc_root(root_inode);
 236         if (!s->s_root)
 237                 goto out_iput;
 238
 239         if (!NO_TRUNCATE)
 240                 s->s_root->d_op = &minix_dentry_operations;
 241
 242         if (!(s->s_flags & MS_RDONLY)) {
 243                 ms->s_state &= ~MINIX_VALID_FS;
 244                 mark_buffer_dirty(bh);
 245         }
 246         if (!(sbi->s_mount_state & MINIX_VALID_FS))
 247                 printk("MINIX-fs: mounting unchecked file system, "
 248                         "running fsck is recommended\n");
 249         else if (sbi->s_mount_state & MINIX_ERROR_FS)
 250                 printk("MINIX-fs: mounting file system with errors, "
 251                         "running fsck is recommended\n");
 252         return 0;
 253
 254 out_iput:
 255         iput(root_inode);
 256         goto out_freemap;
 257
 258 out_no_root:
 259         if (!silent)
 260                 printk("MINIX-fs: get root inode failed\n");
 261         goto out_freemap;
 262
 263 out_no_bitmap:
 264         printk("MINIX-fs: bad superblock or unable to read bitmaps\n");
 265 out_freemap:
 266         for (i = 0; i < sbi->s_imap_blocks; i++)
 267                 brelse(sbi->s_imap[i]);
 268         for (i = 0; i < sbi->s_zmap_blocks; i++)
 269                 brelse(sbi->s_zmap[i]);
 270         kfree(sbi->s_imap);
 271         goto out_release;
 272
 273 out_no_map:
 274         if (!silent)
 275                 printk("MINIX-fs: can't allocate map\n");
 276         goto out_release;
 277
 278 out_illegal_sb:
 279         if (!silent)
 280                 printk("MINIX-fs: bad superblock\n");
 281         goto out_release;
 282
 283 out_no_fs:
 284         if (!silent)
 285                 printk("VFS: Can't find a Minix or Minix V2 filesystem "
 286                         "on device %s\n", s->s_id);
 287 out_release:
 288         brelse(bh);
 289         goto out;
 290
 291 out_bad_hblock:
 292         printk("MINIX-fs: blocksize too small for device\n");
 293         goto out;
 294
 295 out_bad_sb:
 296         printk("MINIX-fs: unable to read superblock\n");
 297 out:
 298         s->s_fs_info = NULL;
 299         kfree(sbi);
 300         return -EINVAL;
 301 }
 302
 303 static int minix_statfs(struct dentry *dentry, struct kstatfs *buf)
 304 {
 305         struct minix_sb_info *sbi = minix_sb(dentry->d_sb);
 306         buf->f_type = dentry->d_sb->s_magic;
 307         buf->f_bsize = dentry->d_sb->s_blocksize;
 308         buf->f_blocks = (sbi->s_nzones - sbi->s_firstdatazone) << sbi->s_log_zone_size;
 309         buf->f_bfree = minix_count_free_blocks(sbi);
 310         buf->f_bavail = buf->f_bfree;
 311         buf->f_files = sbi->s_ninodes;
 312         buf->f_ffree = minix_count_free_inodes(sbi);
 313         buf->f_namelen = sbi->s_namelen;
 314         return 0;
 315 }
 316
 317 static int minix_get_block(struct inode *inode, sector_t block,
 318                     struct buffer_head *bh_result, int create)
 319 {
 320         if (INODE_VERSION(inode) == MINIX_V1)
 321                 return V1_minix_get_block(inode, block, bh_result, create);
 322         else
 323                 return V2_minix_get_block(inode, block, bh_result, create);
 324 }
 325
 326 static int minix_writepage(struct page *page, struct writeback_control *wbc)
 327 {
 328         return block_write_full_page(page, minix_get_block, wbc);
 329 }
 330 static int minix_readpage(struct file *file, struct page *page)
 331 {
 332         return block_read_full_page(page,minix_get_block);
 333 }
 334 static int minix_prepare_write(struct file *file, struct page *page, unsigned from, unsigned to)
 335 {
 336         return block_prepare_write(page,from,to,minix_get_block);
 337 }
 338 static sector_t minix_bmap(struct address_space *mapping, sector_t block)
 339 {
 340         return generic_block_bmap(mapping,block,minix_get_block);
 341 }
 342 static const struct address_space_operations minix_aops = {
 343         .readpage = minix_readpage,
 344         .writepage = minix_writepage,
 345         .sync_page = block_sync_page,
 346         .prepare_write = minix_prepare_write,
 347         .commit_write = generic_commit_write,
 348         .bmap = minix_bmap
 349 };
 350
 351 static struct inode_operations minix_symlink_inode_operations = {
 352         .readlink       = generic_readlink,
 353         .follow_link    = page_follow_link_light,
 354         .put_link       = page_put_link,
 355         .getattr        = minix_getattr,
 356 };
 357
 358 void minix_set_inode(struct inode *inode, dev_t rdev)
 359 {
 360         if (S_ISREG(inode->i_mode)) {
 361                 inode->i_op = &minix_file_inode_operations;
 362                 inode->i_fop = &minix_file_operations;
 363                 inode->i_mapping->a_ops = &minix_aops;
 364         } else if (S_ISDIR(inode->i_mode)) {
 365                 inode->i_op = &minix_dir_inode_operations;
 366                 inode->i_fop = &minix_dir_operations;
 367                 inode->i_mapping->a_ops = &minix_aops;
 368         } else if (S_ISLNK(inode->i_mode)) {
 369                 inode->i_op = &minix_symlink_inode_operations;
 370                 inode->i_mapping->a_ops = &minix_aops;
 371         } else
 372                 init_special_inode(inode, inode->i_mode, rdev);
 373 }
 374
 375 /*
 376  * The minix V1 function to read an inode.
 377  */
 378 static void V1_minix_read_inode(struct inode * inode)
 379 {
 380         struct buffer_head * bh;
 381         struct minix_inode * raw_inode;
 382         struct minix_inode_info *minix_inode = minix_i(inode);
 383         int i;
 384
 385         raw_inode = minix_V1_raw_inode(inode->i_sb, inode->i_ino, &bh);
 386         if (!raw_inode) {
 387                 make_bad_inode(inode);
 388                 return;
 389         }
 390         inode->i_mode = raw_inode->i_mode;
 391         inode->i_uid = (uid_t)raw_inode->i_uid;
 392         inode->i_gid = (gid_t)raw_inode->i_gid;
 393         inode->i_nlink = raw_inode->i_nlinks;
 394         inode->i_size = raw_inode->i_size;
 395         inode->i_mtime.tv_sec = inode->i_atime.tv_sec = inode->i_ctime.tv_sec = raw_inode->i_time;
 396         inode->i_mtime.tv_nsec = 0;
 397         inode->i_atime.tv_nsec = 0;
 398         inode->i_ctime.tv_nsec = 0;
 399         inode->i_blocks = 0;
 400         for (i = 0; i < 9; i++)
 401                 minix_inode->u.i1_data[i] = raw_inode->i_zone[i];
 402         minix_set_inode(inode, old_decode_dev(raw_inode->i_zone[0]));
 403         brelse(bh);
 404 }
 405
 406 /*
 407  * The minix V2 function to read an inode.
 408  */
 409 static void V2_minix_read_inode(struct inode * inode)
 410 {
 411         struct buffer_head * bh;
 412         struct minix2_inode * raw_inode;
 413         struct minix_inode_info *minix_inode = minix_i(inode);
 414         int i;
 415
 416         raw_inode = minix_V2_raw_inode(inode->i_sb, inode->i_ino, &bh);
 417         if (!raw_inode) {
 418                 make_bad_inode(inode);
 419                 return;
 420         }
 421         inode->i_mode = raw_inode->i_mode;
 422         inode->i_uid = (uid_t)raw_inode->i_uid;
 423         inode->i_gid = (gid_t)raw_inode->i_gid;
 424         inode->i_nlink = raw_inode->i_nlinks;
 425         inode->i_size = raw_inode->i_size;
 426         inode->i_mtime.tv_sec = raw_inode->i_mtime;
 427         inode->i_atime.tv_sec = raw_inode->i_atime;
 428         inode->i_ctime.tv_sec = raw_inode->i_ctime;
 429         inode->i_mtime.tv_nsec = 0;
 430         inode->i_atime.tv_nsec = 0;
 431         inode->i_ctime.tv_nsec = 0;
 432         inode->i_blocks = 0;
 433         for (i = 0; i < 10; i++)
 434                 minix_inode->u.i2_data[i] = raw_inode->i_zone[i];
 435         minix_set_inode(inode, old_decode_dev(raw_inode->i_zone[0]));
 436         brelse(bh);
 437 }
 438
 439 /*
 440  * The global function to read an inode.
 441  */
 442 static void minix_read_inode(struct inode * inode)
 443 {
 444         if (INODE_VERSION(inode) == MINIX_V1)
 445                 V1_minix_read_inode(inode);
 446         else
 447                 V2_minix_read_inode(inode);
 448 }
 449
 450 /*
 451  * The minix V1 function to synchronize an inode.
 452  */
 453 static struct buffer_head * V1_minix_update_inode(struct inode * inode)
 454 {
 455         struct buffer_head * bh;
 456         struct minix_inode * raw_inode;
 457         struct minix_inode_info *minix_inode = minix_i(inode);
 458         int i;
 459
 460         raw_inode = minix_V1_raw_inode(inode->i_sb, inode->i_ino, &bh);
 461         if (!raw_inode)
 462                 return NULL;
 463         raw_inode->i_mode = inode->i_mode;
 464         raw_inode->i_uid = fs_high2lowuid(inode->i_uid);
 465         raw_inode->i_gid = fs_high2lowgid(inode->i_gid);
 466         raw_inode->i_nlinks = inode->i_nlink;
 467         raw_inode->i_size = inode->i_size;
 468         raw_inode->i_time = inode->i_mtime.tv_sec;
 469         if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
 470                 raw_inode->i_zone[0] = old_encode_dev(inode->i_rdev);
 471         else for (i = 0; i < 9; i++)
 472                 raw_inode->i_zone[i] = minix_inode->u.i1_data[i];
 473         mark_buffer_dirty(bh);
 474         return bh;
 475 }
 476
 477 /*
 478  * The minix V2 function to synchronize an inode.
 479  */
 480 static struct buffer_head * V2_minix_update_inode(struct inode * inode)
 481 {
 482         struct buffer_head * bh;
 483         struct minix2_inode * raw_inode;
 484         struct minix_inode_info *minix_inode = minix_i(inode);
 485         int i;
 486
 487         raw_inode = minix_V2_raw_inode(inode->i_sb, inode->i_ino, &bh);
 488         if (!raw_inode)
 489                 return NULL;
 490         raw_inode->i_mode = inode->i_mode;
 491         raw_inode->i_uid = fs_high2lowuid(inode->i_uid);
 492         raw_inode->i_gid = fs_high2lowgid(inode->i_gid);
 493         raw_inode->i_nlinks = inode->i_nlink;
 494         raw_inode->i_size = inode->i_size;
 495         raw_inode->i_mtime = inode->i_mtime.tv_sec;
 496         raw_inode->i_atime = inode->i_atime.tv_sec;
 497         raw_inode->i_ctime = inode->i_ctime.tv_sec;
 498         if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
 499                 raw_inode->i_zone[0] = old_encode_dev(inode->i_rdev);
 500         else for (i = 0; i < 10; i++)
 501                 raw_inode->i_zone[i] = minix_inode->u.i2_data[i];
 502         mark_buffer_dirty(bh);
 503         return bh;
 504 }
 505
 506 static struct buffer_head *minix_update_inode(struct inode *inode)
 507 {
 508         if (INODE_VERSION(inode) == MINIX_V1)
 509                 return V1_minix_update_inode(inode);
 510         else
 511                 return V2_minix_update_inode(inode);
 512 }
 513
 514 static int minix_write_inode(struct inode * inode, int wait)
 515 {
 516         brelse(minix_update_inode(inode));
 517         return 0;
 518 }
 519
 520 int minix_sync_inode(struct inode * inode)
 521 {
 522         int err = 0;
 523         struct buffer_head *bh;
 524
 525         bh = minix_update_inode(inode);
 526         if (bh && buffer_dirty(bh))
 527         {
 528                 sync_dirty_buffer(bh);
 529                 if (buffer_req(bh) && !buffer_uptodate(bh))
 530                 {
 531                         printk("IO error syncing minix inode [%s:%08lx]\n",
 532                                 inode->i_sb->s_id, inode->i_ino);
 533                         err = -1;
 534                 }
 535         }
 536         else if (!bh)
 537                 err = -1;
 538         brelse (bh);
 539         return err;
 540 }
 541
 542 int minix_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
 543 {
 544         generic_fillattr(dentry->d_inode, stat);
 545         if (INODE_VERSION(dentry->d_inode) == MINIX_V1)
 546                 stat->blocks = (BLOCK_SIZE / 512) * V1_minix_blocks(stat->size);
 547         else
 548                 stat->blocks = (BLOCK_SIZE / 512) * V2_minix_blocks(stat->size);
 549         stat->blksize = BLOCK_SIZE;
 550         return 0;
 551 }
 552
 553 /*
 554  * The function that is called for file truncation.
 555  */
 556 void minix_truncate(struct inode * inode)
 557 {
 558         if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode)))
 559                 return;
 560         if (INODE_VERSION(inode) == MINIX_V1)
 561                 V1_minix_truncate(inode);
 562         else
 563                 V2_minix_truncate(inode);
 564 }
 565
 566 static int minix_get_sb(struct file_system_type *fs_type,
 567         int flags, const char *dev_name, void *data, struct vfsmount *mnt)
 568 {
 569         return get_sb_bdev(fs_type, flags, dev_name, data, minix_fill_super,
 570                            mnt);
 571 }
 572
 573 static struct file_system_type minix_fs_type = {
 574         .owner          = THIS_MODULE,
 575         .name           = "minix",
 576         .get_sb         = minix_get_sb,
 577         .kill_sb        = kill_block_super,
 578         .fs_flags       = FS_REQUIRES_DEV,
 579 };
 580
 581 static int __init init_minix_fs(void)
 582 {
 583         int err = init_inodecache();
 584         if (err)
 585                 goto out1;
 586         err = register_filesystem(&minix_fs_type);
 587         if (err)
 588                 goto out;
 589         return 0;
 590 out:
 591         destroy_inodecache();
 592 out1:
 593         return err;
 594 }
 595
 596 static void __exit exit_minix_fs(void)
 597 {
 598         unregister_filesystem(&minix_fs_type);
 599         destroy_inodecache();
 600 }
 601
 602 module_init(init_minix_fs)
 603 module_exit(exit_minix_fs)
 604 MODULE_LICENSE("GPL");
 605