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  *  Updated to filesystem version 3 by Daniel Aragones
  11  */
  12
  13 #include <linux/module.h>
  14 #include "minix.h"
  15 #include <linux/buffer_head.h>
  16 #include <linux/slab.h>
  17 #include <linux/init.h>
  18 #include <linux/highuid.h>
  19 #include <linux/vfs.h>
  20
  21 static void minix_read_inode(struct inode * inode);
  22 static int minix_write_inode(struct inode * inode, int wait);
  23 static int minix_statfs(struct dentry *dentry, struct kstatfs *buf);
  24 static int minix_remount (struct super_block * sb, int * flags, char * data);
  25
  26 static void minix_delete_inode(struct inode *inode)
  27 {
  28         truncate_inode_pages(&inode->i_data, 0);
  29         inode->i_size = 0;
  30         minix_truncate(inode);
  31         minix_free_inode(inode);
  32 }
  33
  34 static void minix_put_super(struct super_block *sb)
  35 {
  36         int i;
  37         struct minix_sb_info *sbi = minix_sb(sb);
  38
  39         if (!(sb->s_flags & MS_RDONLY)) {
  40                 if (sbi->s_version != MINIX_V3)  /* s_state is now out from V3 sb */
  41                         sbi->s_ms->s_state = sbi->s_mount_state;
  42                 mark_buffer_dirty(sbi->s_sbh);
  43         }
  44         for (i = 0; i < sbi->s_imap_blocks; i++)
  45                 brelse(sbi->s_imap[i]);
  46         for (i = 0; i < sbi->s_zmap_blocks; i++)
  47                 brelse(sbi->s_zmap[i]);
  48         brelse (sbi->s_sbh);
  49         kfree(sbi->s_imap);
  50         sb->s_fs_info = NULL;
  51         kfree(sbi);
  52
  53         return;
  54 }
  55
  56 static struct kmem_cache * minix_inode_cachep;
  57
  58 static struct inode *minix_alloc_inode(struct super_block *sb)
  59 {
  60         struct minix_inode_info *ei;
  61         ei = (struct minix_inode_info *)kmem_cache_alloc(minix_inode_cachep, GFP_KERNEL);
  62         if (!ei)
  63                 return NULL;
  64         return &ei->vfs_inode;
  65 }
  66
  67 static void minix_destroy_inode(struct inode *inode)
  68 {
  69         kmem_cache_free(minix_inode_cachep, minix_i(inode));
  70 }
  71
  72 static void init_once(void * foo, struct kmem_cache * cachep, unsigned long flags)
  73 {
  74         struct minix_inode_info *ei = (struct minix_inode_info *) foo;
  75
  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 const 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                 if (sbi->s_version != MINIX_V3)
 121                         ms->s_state = sbi->s_mount_state;
 122                 mark_buffer_dirty(sbi->s_sbh);
 123         } else {
 124                 /* Mount a partition which is read-only, read-write. */
 125                 if (sbi->s_version != MINIX_V3) {
 126                         sbi->s_mount_state = ms->s_state;
 127                         ms->s_state &= ~MINIX_VALID_FS;
 128                 } else {
 129                         sbi->s_mount_state = MINIX_VALID_FS;
 130                 }
 131                 mark_buffer_dirty(sbi->s_sbh);
 132
 133                 if (!(sbi->s_mount_state & MINIX_VALID_FS))
 134                         printk("MINIX-fs warning: remounting unchecked fs, "
 135                                 "running fsck is recommended\n");
 136                 else if ((sbi->s_mount_state & MINIX_ERROR_FS))
 137                         printk("MINIX-fs warning: remounting fs with errors, "
 138                                 "running fsck is recommended\n");
 139         }
 140         return 0;
 141 }
 142
 143 static int minix_fill_super(struct super_block *s, void *data, int silent)
 144 {
 145         struct buffer_head *bh;
 146         struct buffer_head **map;
 147         struct minix_super_block *ms;
 148         struct minix3_super_block *m3s = NULL;
 149         unsigned long i, block;
 150         struct inode *root_inode;
 151         struct minix_sb_info *sbi;
 152
 153         sbi = kzalloc(sizeof(struct minix_sb_info), GFP_KERNEL);
 154         if (!sbi)
 155                 return -ENOMEM;
 156         s->s_fs_info = sbi;
 157
 158         BUILD_BUG_ON(32 != sizeof (struct minix_inode));
 159         BUILD_BUG_ON(64 != sizeof(struct minix2_inode));
 160
 161         if (!sb_set_blocksize(s, BLOCK_SIZE))
 162                 goto out_bad_hblock;
 163
 164         if (!(bh = sb_bread(s, 1)))
 165                 goto out_bad_sb;
 166
 167         ms = (struct minix_super_block *) bh->b_data;
 168         sbi->s_ms = ms;
 169         sbi->s_sbh = bh;
 170         sbi->s_mount_state = ms->s_state;
 171         sbi->s_ninodes = ms->s_ninodes;
 172         sbi->s_nzones = ms->s_nzones;
 173         sbi->s_imap_blocks = ms->s_imap_blocks;
 174         sbi->s_zmap_blocks = ms->s_zmap_blocks;
 175         sbi->s_firstdatazone = ms->s_firstdatazone;
 176         sbi->s_log_zone_size = ms->s_log_zone_size;
 177         sbi->s_max_size = ms->s_max_size;
 178         s->s_magic = ms->s_magic;
 179         if (s->s_magic == MINIX_SUPER_MAGIC) {
 180                 sbi->s_version = MINIX_V1;
 181                 sbi->s_dirsize = 16;
 182                 sbi->s_namelen = 14;
 183                 sbi->s_link_max = MINIX_LINK_MAX;
 184         } else if (s->s_magic == MINIX_SUPER_MAGIC2) {
 185                 sbi->s_version = MINIX_V1;
 186                 sbi->s_dirsize = 32;
 187                 sbi->s_namelen = 30;
 188                 sbi->s_link_max = MINIX_LINK_MAX;
 189         } else if (s->s_magic == MINIX2_SUPER_MAGIC) {
 190                 sbi->s_version = MINIX_V2;
 191                 sbi->s_nzones = ms->s_zones;
 192                 sbi->s_dirsize = 16;
 193                 sbi->s_namelen = 14;
 194                 sbi->s_link_max = MINIX2_LINK_MAX;
 195         } else if (s->s_magic == MINIX2_SUPER_MAGIC2) {
 196                 sbi->s_version = MINIX_V2;
 197                 sbi->s_nzones = ms->s_zones;
 198                 sbi->s_dirsize = 32;
 199                 sbi->s_namelen = 30;
 200                 sbi->s_link_max = MINIX2_LINK_MAX;
 201         } else if ( *(__u16 *)(bh->b_data + 24) == MINIX3_SUPER_MAGIC) {
 202                 m3s = (struct minix3_super_block *) bh->b_data;
 203                 s->s_magic = m3s->s_magic;
 204                 sbi->s_imap_blocks = m3s->s_imap_blocks;
 205                 sbi->s_zmap_blocks = m3s->s_zmap_blocks;
 206                 sbi->s_firstdatazone = m3s->s_firstdatazone;
 207                 sbi->s_log_zone_size = m3s->s_log_zone_size;
 208                 sbi->s_max_size = m3s->s_max_size;
 209                 sbi->s_ninodes = m3s->s_ninodes;
 210                 sbi->s_nzones = m3s->s_zones;
 211                 sbi->s_dirsize = 64;
 212                 sbi->s_namelen = 60;
 213                 sbi->s_version = MINIX_V3;
 214                 sbi->s_link_max = MINIX2_LINK_MAX;
 215                 sbi->s_mount_state = MINIX_VALID_FS;
 216                 sb_set_blocksize(s, m3s->s_blocksize);
 217         } else
 218                 goto out_no_fs;
 219
 220         /*
 221          * Allocate the buffer map to keep the superblock small.
 222          */
 223         if (sbi->s_imap_blocks == 0 || sbi->s_zmap_blocks == 0)
 224                 goto out_illegal_sb;
 225         i = (sbi->s_imap_blocks + sbi->s_zmap_blocks) * sizeof(bh);
 226         map = kzalloc(i, GFP_KERNEL);
 227         if (!map)
 228                 goto out_no_map;
 229         sbi->s_imap = &map[0];
 230         sbi->s_zmap = &map[sbi->s_imap_blocks];
 231
 232         block=2;
 233         for (i=0 ; i < sbi->s_imap_blocks ; i++) {
 234                 if (!(sbi->s_imap[i]=sb_bread(s, block)))
 235                         goto out_no_bitmap;
 236                 block++;
 237         }
 238         for (i=0 ; i < sbi->s_zmap_blocks ; i++) {
 239                 if (!(sbi->s_zmap[i]=sb_bread(s, block)))
 240                         goto out_no_bitmap;
 241                 block++;
 242         }
 243
 244         minix_set_bit(0,sbi->s_imap[0]->b_data);
 245         minix_set_bit(0,sbi->s_zmap[0]->b_data);
 246
 247         /* set up enough so that it can read an inode */
 248         s->s_op = &minix_sops;
 249         root_inode = iget(s, MINIX_ROOT_INO);
 250         if (!root_inode || is_bad_inode(root_inode))
 251                 goto out_no_root;
 252
 253         s->s_root = d_alloc_root(root_inode);
 254         if (!s->s_root)
 255                 goto out_iput;
 256
 257         if (!NO_TRUNCATE)
 258                 s->s_root->d_op = &minix_dentry_operations;
 259
 260         if (!(s->s_flags & MS_RDONLY)) {
 261                 if (sbi->s_version != MINIX_V3) /* s_state is now out from V3 sb */
 262                         ms->s_state &= ~MINIX_VALID_FS;
 263                 mark_buffer_dirty(bh);
 264         }
 265         if (!(sbi->s_mount_state & MINIX_VALID_FS))
 266                 printk("MINIX-fs: mounting unchecked file system, "
 267                         "running fsck is recommended\n");
 268         else if (sbi->s_mount_state & MINIX_ERROR_FS)
 269                 printk("MINIX-fs: mounting file system with errors, "
 270                         "running fsck is recommended\n");
 271         return 0;
 272
 273 out_iput:
 274         iput(root_inode);
 275         goto out_freemap;
 276
 277 out_no_root:
 278         if (!silent)
 279                 printk("MINIX-fs: get root inode failed\n");
 280         goto out_freemap;
 281
 282 out_no_bitmap:
 283         printk("MINIX-fs: bad superblock or unable to read bitmaps\n");
 284 out_freemap:
 285         for (i = 0; i < sbi->s_imap_blocks; i++)
 286                 brelse(sbi->s_imap[i]);
 287         for (i = 0; i < sbi->s_zmap_blocks; i++)
 288                 brelse(sbi->s_zmap[i]);
 289         kfree(sbi->s_imap);
 290         goto out_release;
 291
 292 out_no_map:
 293         if (!silent)
 294                 printk("MINIX-fs: can't allocate map\n");
 295         goto out_release;
 296
 297 out_illegal_sb:
 298         if (!silent)
 299                 printk("MINIX-fs: bad superblock\n");
 300         goto out_release;
 301
 302 out_no_fs:
 303         if (!silent)
 304                 printk("VFS: Can't find a Minix filesystem V1 | V2 | V3 "
 305                        "on device %s.\n", s->s_id);
 306 out_release:
 307         brelse(bh);
 308         goto out;
 309
 310 out_bad_hblock:
 311         printk("MINIX-fs: blocksize too small for device\n");
 312         goto out;
 313
 314 out_bad_sb:
 315         printk("MINIX-fs: unable to read superblock\n");
 316 out:
 317         s->s_fs_info = NULL;
 318         kfree(sbi);
 319         return -EINVAL;
 320 }
 321
 322 static int minix_statfs(struct dentry *dentry, struct kstatfs *buf)
 323 {
 324         struct minix_sb_info *sbi = minix_sb(dentry->d_sb);
 325         buf->f_type = dentry->d_sb->s_magic;
 326         buf->f_bsize = dentry->d_sb->s_blocksize;
 327         buf->f_blocks = (sbi->s_nzones - sbi->s_firstdatazone) << sbi->s_log_zone_size;
 328         buf->f_bfree = minix_count_free_blocks(sbi);
 329         buf->f_bavail = buf->f_bfree;
 330         buf->f_files = sbi->s_ninodes;
 331         buf->f_ffree = minix_count_free_inodes(sbi);
 332         buf->f_namelen = sbi->s_namelen;
 333         return 0;
 334 }
 335
 336 static int minix_get_block(struct inode *inode, sector_t block,
 337                     struct buffer_head *bh_result, int create)
 338 {
 339         if (INODE_VERSION(inode) == MINIX_V1)
 340                 return V1_minix_get_block(inode, block, bh_result, create);
 341         else
 342                 return V2_minix_get_block(inode, block, bh_result, create);
 343 }
 344
 345 static int minix_writepage(struct page *page, struct writeback_control *wbc)
 346 {
 347         return block_write_full_page(page, minix_get_block, wbc);
 348 }
 349 static int minix_readpage(struct file *file, struct page *page)
 350 {
 351         return block_read_full_page(page,minix_get_block);
 352 }
 353 static int minix_prepare_write(struct file *file, struct page *page, unsigned from, unsigned to)
 354 {
 355         return block_prepare_write(page,from,to,minix_get_block);
 356 }
 357 static sector_t minix_bmap(struct address_space *mapping, sector_t block)
 358 {
 359         return generic_block_bmap(mapping,block,minix_get_block);
 360 }
 361 static const struct address_space_operations minix_aops = {
 362         .readpage = minix_readpage,
 363         .writepage = minix_writepage,
 364         .sync_page = block_sync_page,
 365         .prepare_write = minix_prepare_write,
 366         .commit_write = generic_commit_write,
 367         .bmap = minix_bmap
 368 };
 369
 370 static const struct inode_operations minix_symlink_inode_operations = {
 371         .readlink       = generic_readlink,
 372         .follow_link    = page_follow_link_light,
 373         .put_link       = page_put_link,
 374         .getattr        = minix_getattr,
 375 };
 376
 377 void minix_set_inode(struct inode *inode, dev_t rdev)
 378 {
 379         if (S_ISREG(inode->i_mode)) {
 380                 inode->i_op = &minix_file_inode_operations;
 381                 inode->i_fop = &minix_file_operations;
 382                 inode->i_mapping->a_ops = &minix_aops;
 383         } else if (S_ISDIR(inode->i_mode)) {
 384                 inode->i_op = &minix_dir_inode_operations;
 385                 inode->i_fop = &minix_dir_operations;
 386                 inode->i_mapping->a_ops = &minix_aops;
 387         } else if (S_ISLNK(inode->i_mode)) {
 388                 inode->i_op = &minix_symlink_inode_operations;
 389                 inode->i_mapping->a_ops = &minix_aops;
 390         } else
 391                 init_special_inode(inode, inode->i_mode, rdev);
 392 }
 393
 394 /*
 395  * The minix V1 function to read an inode.
 396  */
 397 static void V1_minix_read_inode(struct inode * inode)
 398 {
 399         struct buffer_head * bh;
 400         struct minix_inode * raw_inode;
 401         struct minix_inode_info *minix_inode = minix_i(inode);
 402         int i;
 403
 404         raw_inode = minix_V1_raw_inode(inode->i_sb, inode->i_ino, &bh);
 405         if (!raw_inode) {
 406                 make_bad_inode(inode);
 407                 return;
 408         }
 409         inode->i_mode = raw_inode->i_mode;
 410         inode->i_uid = (uid_t)raw_inode->i_uid;
 411         inode->i_gid = (gid_t)raw_inode->i_gid;
 412         inode->i_nlink = raw_inode->i_nlinks;
 413         inode->i_size = raw_inode->i_size;
 414         inode->i_mtime.tv_sec = inode->i_atime.tv_sec = inode->i_ctime.tv_sec = raw_inode->i_time;
 415         inode->i_mtime.tv_nsec = 0;
 416         inode->i_atime.tv_nsec = 0;
 417         inode->i_ctime.tv_nsec = 0;
 418         inode->i_blocks = 0;
 419         for (i = 0; i < 9; i++)
 420                 minix_inode->u.i1_data[i] = raw_inode->i_zone[i];
 421         minix_set_inode(inode, old_decode_dev(raw_inode->i_zone[0]));
 422         brelse(bh);
 423 }
 424
 425 /*
 426  * The minix V2 function to read an inode.
 427  */
 428 static void V2_minix_read_inode(struct inode * inode)
 429 {
 430         struct buffer_head * bh;
 431         struct minix2_inode * raw_inode;
 432         struct minix_inode_info *minix_inode = minix_i(inode);
 433         int i;
 434
 435         raw_inode = minix_V2_raw_inode(inode->i_sb, inode->i_ino, &bh);
 436         if (!raw_inode) {
 437                 make_bad_inode(inode);
 438                 return;
 439         }
 440         inode->i_mode = raw_inode->i_mode;
 441         inode->i_uid = (uid_t)raw_inode->i_uid;
 442         inode->i_gid = (gid_t)raw_inode->i_gid;
 443         inode->i_nlink = raw_inode->i_nlinks;
 444         inode->i_size = raw_inode->i_size;
 445         inode->i_mtime.tv_sec = raw_inode->i_mtime;
 446         inode->i_atime.tv_sec = raw_inode->i_atime;
 447         inode->i_ctime.tv_sec = raw_inode->i_ctime;
 448         inode->i_mtime.tv_nsec = 0;
 449         inode->i_atime.tv_nsec = 0;
 450         inode->i_ctime.tv_nsec = 0;
 451         inode->i_blocks = 0;
 452         for (i = 0; i < 10; i++)
 453                 minix_inode->u.i2_data[i] = raw_inode->i_zone[i];
 454         minix_set_inode(inode, old_decode_dev(raw_inode->i_zone[0]));
 455         brelse(bh);
 456 }
 457
 458 /*
 459  * The global function to read an inode.
 460  */
 461 static void minix_read_inode(struct inode * inode)
 462 {
 463         if (INODE_VERSION(inode) == MINIX_V1)
 464                 V1_minix_read_inode(inode);
 465         else
 466                 V2_minix_read_inode(inode);
 467 }
 468
 469 /*
 470  * The minix V1 function to synchronize an inode.
 471  */
 472 static struct buffer_head * V1_minix_update_inode(struct inode * inode)
 473 {
 474         struct buffer_head * bh;
 475         struct minix_inode * raw_inode;
 476         struct minix_inode_info *minix_inode = minix_i(inode);
 477         int i;
 478
 479         raw_inode = minix_V1_raw_inode(inode->i_sb, inode->i_ino, &bh);
 480         if (!raw_inode)
 481                 return NULL;
 482         raw_inode->i_mode = inode->i_mode;
 483         raw_inode->i_uid = fs_high2lowuid(inode->i_uid);
 484         raw_inode->i_gid = fs_high2lowgid(inode->i_gid);
 485         raw_inode->i_nlinks = inode->i_nlink;
 486         raw_inode->i_size = inode->i_size;
 487         raw_inode->i_time = inode->i_mtime.tv_sec;
 488         if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
 489                 raw_inode->i_zone[0] = old_encode_dev(inode->i_rdev);
 490         else for (i = 0; i < 9; i++)
 491                 raw_inode->i_zone[i] = minix_inode->u.i1_data[i];
 492         mark_buffer_dirty(bh);
 493         return bh;
 494 }
 495
 496 /*
 497  * The minix V2 function to synchronize an inode.
 498  */
 499 static struct buffer_head * V2_minix_update_inode(struct inode * inode)
 500 {
 501         struct buffer_head * bh;
 502         struct minix2_inode * raw_inode;
 503         struct minix_inode_info *minix_inode = minix_i(inode);
 504         int i;
 505
 506         raw_inode = minix_V2_raw_inode(inode->i_sb, inode->i_ino, &bh);
 507         if (!raw_inode)
 508                 return NULL;
 509         raw_inode->i_mode = inode->i_mode;
 510         raw_inode->i_uid = fs_high2lowuid(inode->i_uid);
 511         raw_inode->i_gid = fs_high2lowgid(inode->i_gid);
 512         raw_inode->i_nlinks = inode->i_nlink;
 513         raw_inode->i_size = inode->i_size;
 514         raw_inode->i_mtime = inode->i_mtime.tv_sec;
 515         raw_inode->i_atime = inode->i_atime.tv_sec;
 516         raw_inode->i_ctime = inode->i_ctime.tv_sec;
 517         if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
 518                 raw_inode->i_zone[0] = old_encode_dev(inode->i_rdev);
 519         else for (i = 0; i < 10; i++)
 520                 raw_inode->i_zone[i] = minix_inode->u.i2_data[i];
 521         mark_buffer_dirty(bh);
 522         return bh;
 523 }
 524
 525 static struct buffer_head *minix_update_inode(struct inode *inode)
 526 {
 527         if (INODE_VERSION(inode) == MINIX_V1)
 528                 return V1_minix_update_inode(inode);
 529         else
 530                 return V2_minix_update_inode(inode);
 531 }
 532
 533 static int minix_write_inode(struct inode * inode, int wait)
 534 {
 535         brelse(minix_update_inode(inode));
 536         return 0;
 537 }
 538
 539 int minix_sync_inode(struct inode * inode)
 540 {
 541         int err = 0;
 542         struct buffer_head *bh;
 543
 544         bh = minix_update_inode(inode);
 545         if (bh && buffer_dirty(bh))
 546         {
 547                 sync_dirty_buffer(bh);
 548                 if (buffer_req(bh) && !buffer_uptodate(bh))
 549                 {
 550                         printk("IO error syncing minix inode [%s:%08lx]\n",
 551                                 inode->i_sb->s_id, inode->i_ino);
 552                         err = -1;
 553                 }
 554         }
 555         else if (!bh)
 556                 err = -1;
 557         brelse (bh);
 558         return err;
 559 }
 560
 561 int minix_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
 562 {
 563         struct inode *dir = dentry->d_parent->d_inode;
 564         struct super_block *sb = dir->i_sb;
 565         generic_fillattr(dentry->d_inode, stat);
 566         if (INODE_VERSION(dentry->d_inode) == MINIX_V1)
 567                 stat->blocks = (BLOCK_SIZE / 512) * V1_minix_blocks(stat->size, sb);
 568         else
 569                 stat->blocks = (sb->s_blocksize / 512) * V2_minix_blocks(stat->size, sb);
 570         stat->blksize = sb->s_blocksize;
 571         return 0;
 572 }
 573
 574 /*
 575  * The function that is called for file truncation.
 576  */
 577 void minix_truncate(struct inode * inode)
 578 {
 579         if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode)))
 580                 return;
 581         if (INODE_VERSION(inode) == MINIX_V1)
 582                 V1_minix_truncate(inode);
 583         else
 584                 V2_minix_truncate(inode);
 585 }
 586
 587 static int minix_get_sb(struct file_system_type *fs_type,
 588         int flags, const char *dev_name, void *data, struct vfsmount *mnt)
 589 {
 590         return get_sb_bdev(fs_type, flags, dev_name, data, minix_fill_super,
 591                            mnt);
 592 }
 593
 594 static struct file_system_type minix_fs_type = {
 595         .owner          = THIS_MODULE,
 596         .name           = "minix",
 597         .get_sb         = minix_get_sb,
 598         .kill_sb        = kill_block_super,
 599         .fs_flags       = FS_REQUIRES_DEV,
 600 };
 601
 602 static int __init init_minix_fs(void)
 603 {
 604         int err = init_inodecache();
 605         if (err)
 606                 goto out1;
 607         err = register_filesystem(&minix_fs_type);
 608         if (err)
 609                 goto out;
 610         return 0;
 611 out:
 612         destroy_inodecache();
 613 out1:
 614         return err;
 615 }
 616
 617 static void __exit exit_minix_fs(void)
 618 {
 619         unregister_filesystem(&minix_fs_type);
 620         destroy_inodecache();
 621 }
 622
 623 module_init(init_minix_fs)
 624 module_exit(exit_minix_fs)
 625 MODULE_LICENSE("GPL");
 626