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
   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 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                 if (sbi->s_version != MINIX_V3)  /* s_state is now out from V3 sb */
  40                         sbi->s_ms->s_state = sbi->s_mount_state;
  41                 mark_buffer_dirty(sbi->s_sbh);
  42         }
  43         for (i = 0; i < sbi->s_imap_blocks; i++)
  44                 brelse(sbi->s_imap[i]);
  45         for (i = 0; i < sbi->s_zmap_blocks; i++)
  46                 brelse(sbi->s_zmap[i]);
  47         brelse (sbi->s_sbh);
  48         kfree(sbi->s_imap);
  49         sb->s_fs_info = NULL;
  50         kfree(sbi);
  51 }
  52
  53 static struct kmem_cache * minix_inode_cachep;
  54
  55 static struct inode *minix_alloc_inode(struct super_block *sb)
  56 {
  57         struct minix_inode_info *ei;
  58         ei = (struct minix_inode_info *)kmem_cache_alloc(minix_inode_cachep, GFP_KERNEL);
  59         if (!ei)
  60                 return NULL;
  61         return &ei->vfs_inode;
  62 }
  63
  64 static void minix_destroy_inode(struct inode *inode)
  65 {
  66         kmem_cache_free(minix_inode_cachep, minix_i(inode));
  67 }
  68
  69 static void init_once(void *foo)
  70 {
  71         struct minix_inode_info *ei = (struct minix_inode_info *) foo;
  72
  73         inode_init_once(&ei->vfs_inode);
  74 }
  75
  76 static int init_inodecache(void)
  77 {
  78         minix_inode_cachep = kmem_cache_create("minix_inode_cache",
  79                                              sizeof(struct minix_inode_info),
  80                                              0, (SLAB_RECLAIM_ACCOUNT|
  81                                                 SLAB_MEM_SPREAD),
  82                                              init_once);
  83         if (minix_inode_cachep == NULL)
  84                 return -ENOMEM;
  85         return 0;
  86 }
  87
  88 static void destroy_inodecache(void)
  89 {
  90         kmem_cache_destroy(minix_inode_cachep);
  91 }
  92
  93 static const struct super_operations minix_sops = {
  94         .alloc_inode    = minix_alloc_inode,
  95         .destroy_inode  = minix_destroy_inode,
  96         .write_inode    = minix_write_inode,
  97         .delete_inode   = minix_delete_inode,
  98         .put_super      = minix_put_super,
  99         .statfs         = minix_statfs,
 100         .remount_fs     = minix_remount,
 101 };
 102
 103 static int minix_remount (struct super_block * sb, int * flags, char * data)
 104 {
 105         struct minix_sb_info * sbi = minix_sb(sb);
 106         struct minix_super_block * ms;
 107
 108         ms = sbi->s_ms;
 109         if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
 110                 return 0;
 111         if (*flags & MS_RDONLY) {
 112                 if (ms->s_state & MINIX_VALID_FS ||
 113                     !(sbi->s_mount_state & MINIX_VALID_FS))
 114                         return 0;
 115                 /* Mounting a rw partition read-only. */
 116                 if (sbi->s_version != MINIX_V3)
 117                         ms->s_state = sbi->s_mount_state;
 118                 mark_buffer_dirty(sbi->s_sbh);
 119         } else {
 120                 /* Mount a partition which is read-only, read-write. */
 121                 if (sbi->s_version != MINIX_V3) {
 122                         sbi->s_mount_state = ms->s_state;
 123                         ms->s_state &= ~MINIX_VALID_FS;
 124                 } else {
 125                         sbi->s_mount_state = MINIX_VALID_FS;
 126                 }
 127                 mark_buffer_dirty(sbi->s_sbh);
 128
 129                 if (!(sbi->s_mount_state & MINIX_VALID_FS))
 130                         printk("MINIX-fs warning: remounting unchecked fs, "
 131                                 "running fsck is recommended\n");
 132                 else if ((sbi->s_mount_state & MINIX_ERROR_FS))
 133                         printk("MINIX-fs warning: remounting fs with errors, "
 134                                 "running fsck is recommended\n");
 135         }
 136         return 0;
 137 }
 138
 139 static int minix_fill_super(struct super_block *s, void *data, int silent)
 140 {
 141         struct buffer_head *bh;
 142         struct buffer_head **map;
 143         struct minix_super_block *ms;
 144         struct minix3_super_block *m3s = NULL;
 145         unsigned long i, block;
 146         struct inode *root_inode;
 147         struct minix_sb_info *sbi;
 148         int ret = -EINVAL;
 149
 150         sbi = kzalloc(sizeof(struct minix_sb_info), GFP_KERNEL);
 151         if (!sbi)
 152                 return -ENOMEM;
 153         s->s_fs_info = sbi;
 154
 155         BUILD_BUG_ON(32 != sizeof (struct minix_inode));
 156         BUILD_BUG_ON(64 != sizeof(struct minix2_inode));
 157
 158         if (!sb_set_blocksize(s, BLOCK_SIZE))
 159                 goto out_bad_hblock;
 160
 161         if (!(bh = sb_bread(s, 1)))
 162                 goto out_bad_sb;
 163
 164         ms = (struct minix_super_block *) bh->b_data;
 165         sbi->s_ms = ms;
 166         sbi->s_sbh = bh;
 167         sbi->s_mount_state = ms->s_state;
 168         sbi->s_ninodes = ms->s_ninodes;
 169         sbi->s_nzones = ms->s_nzones;
 170         sbi->s_imap_blocks = ms->s_imap_blocks;
 171         sbi->s_zmap_blocks = ms->s_zmap_blocks;
 172         sbi->s_firstdatazone = ms->s_firstdatazone;
 173         sbi->s_log_zone_size = ms->s_log_zone_size;
 174         sbi->s_max_size = ms->s_max_size;
 175         s->s_magic = ms->s_magic;
 176         if (s->s_magic == MINIX_SUPER_MAGIC) {
 177                 sbi->s_version = MINIX_V1;
 178                 sbi->s_dirsize = 16;
 179                 sbi->s_namelen = 14;
 180                 sbi->s_link_max = MINIX_LINK_MAX;
 181         } else if (s->s_magic == MINIX_SUPER_MAGIC2) {
 182                 sbi->s_version = MINIX_V1;
 183                 sbi->s_dirsize = 32;
 184                 sbi->s_namelen = 30;
 185                 sbi->s_link_max = MINIX_LINK_MAX;
 186         } else if (s->s_magic == MINIX2_SUPER_MAGIC) {
 187                 sbi->s_version = MINIX_V2;
 188                 sbi->s_nzones = ms->s_zones;
 189                 sbi->s_dirsize = 16;
 190                 sbi->s_namelen = 14;
 191                 sbi->s_link_max = MINIX2_LINK_MAX;
 192         } else if (s->s_magic == MINIX2_SUPER_MAGIC2) {
 193                 sbi->s_version = MINIX_V2;
 194                 sbi->s_nzones = ms->s_zones;
 195                 sbi->s_dirsize = 32;
 196                 sbi->s_namelen = 30;
 197                 sbi->s_link_max = MINIX2_LINK_MAX;
 198         } else if ( *(__u16 *)(bh->b_data + 24) == MINIX3_SUPER_MAGIC) {
 199                 m3s = (struct minix3_super_block *) bh->b_data;
 200                 s->s_magic = m3s->s_magic;
 201                 sbi->s_imap_blocks = m3s->s_imap_blocks;
 202                 sbi->s_zmap_blocks = m3s->s_zmap_blocks;
 203                 sbi->s_firstdatazone = m3s->s_firstdatazone;
 204                 sbi->s_log_zone_size = m3s->s_log_zone_size;
 205                 sbi->s_max_size = m3s->s_max_size;
 206                 sbi->s_ninodes = m3s->s_ninodes;
 207                 sbi->s_nzones = m3s->s_zones;
 208                 sbi->s_dirsize = 64;
 209                 sbi->s_namelen = 60;
 210                 sbi->s_version = MINIX_V3;
 211                 sbi->s_link_max = MINIX2_LINK_MAX;
 212                 sbi->s_mount_state = MINIX_VALID_FS;
 213                 sb_set_blocksize(s, m3s->s_blocksize);
 214         } else
 215                 goto out_no_fs;
 216
 217         /*
 218          * Allocate the buffer map to keep the superblock small.
 219          */
 220         if (sbi->s_imap_blocks == 0 || sbi->s_zmap_blocks == 0)
 221                 goto out_illegal_sb;
 222         i = (sbi->s_imap_blocks + sbi->s_zmap_blocks) * sizeof(bh);
 223         map = kzalloc(i, GFP_KERNEL);
 224         if (!map)
 225                 goto out_no_map;
 226         sbi->s_imap = &map[0];
 227         sbi->s_zmap = &map[sbi->s_imap_blocks];
 228
 229         block=2;
 230         for (i=0 ; i < sbi->s_imap_blocks ; i++) {
 231                 if (!(sbi->s_imap[i]=sb_bread(s, block)))
 232                         goto out_no_bitmap;
 233                 block++;
 234         }
 235         for (i=0 ; i < sbi->s_zmap_blocks ; i++) {
 236                 if (!(sbi->s_zmap[i]=sb_bread(s, block)))
 237                         goto out_no_bitmap;
 238                 block++;
 239         }
 240
 241         minix_set_bit(0,sbi->s_imap[0]->b_data);
 242         minix_set_bit(0,sbi->s_zmap[0]->b_data);
 243
 244         /* set up enough so that it can read an inode */
 245         s->s_op = &minix_sops;
 246         root_inode = minix_iget(s, MINIX_ROOT_INO);
 247         if (IS_ERR(root_inode)) {
 248                 ret = PTR_ERR(root_inode);
 249                 goto out_no_root;
 250         }
 251
 252         ret = -ENOMEM;
 253         s->s_root = d_alloc_root(root_inode);
 254         if (!s->s_root)
 255                 goto out_iput;
 256
 257         if (!(s->s_flags & MS_RDONLY)) {
 258                 if (sbi->s_version != MINIX_V3) /* s_state is now out from V3 sb */
 259                         ms->s_state &= ~MINIX_VALID_FS;
 260                 mark_buffer_dirty(bh);
 261         }
 262         if (!(sbi->s_mount_state & MINIX_VALID_FS))
 263                 printk("MINIX-fs: mounting unchecked file system, "
 264                         "running fsck is recommended\n");
 265         else if (sbi->s_mount_state & MINIX_ERROR_FS)
 266                 printk("MINIX-fs: mounting file system with errors, "
 267                         "running fsck is recommended\n");
 268         return 0;
 269
 270 out_iput:
 271         iput(root_inode);
 272         goto out_freemap;
 273
 274 out_no_root:
 275         if (!silent)
 276                 printk("MINIX-fs: get root inode failed\n");
 277         goto out_freemap;
 278
 279 out_no_bitmap:
 280         printk("MINIX-fs: bad superblock or unable to read bitmaps\n");
 281 out_freemap:
 282         for (i = 0; i < sbi->s_imap_blocks; i++)
 283                 brelse(sbi->s_imap[i]);
 284         for (i = 0; i < sbi->s_zmap_blocks; i++)
 285                 brelse(sbi->s_zmap[i]);
 286         kfree(sbi->s_imap);
 287         goto out_release;
 288
 289 out_no_map:
 290         ret = -ENOMEM;
 291         if (!silent)
 292                 printk("MINIX-fs: can't allocate map\n");
 293         goto out_release;
 294
 295 out_illegal_sb:
 296         if (!silent)
 297                 printk("MINIX-fs: bad superblock\n");
 298         goto out_release;
 299
 300 out_no_fs:
 301         if (!silent)
 302                 printk("VFS: Can't find a Minix filesystem V1 | V2 | V3 "
 303                        "on device %s.\n", s->s_id);
 304 out_release:
 305         brelse(bh);
 306         goto out;
 307
 308 out_bad_hblock:
 309         printk("MINIX-fs: blocksize too small for device\n");
 310         goto out;
 311
 312 out_bad_sb:
 313         printk("MINIX-fs: unable to read superblock\n");
 314 out:
 315         s->s_fs_info = NULL;
 316         kfree(sbi);
 317         return ret;
 318 }
 319
 320 static int minix_statfs(struct dentry *dentry, struct kstatfs *buf)
 321 {
 322         struct super_block *sb = dentry->d_sb;
 323         struct minix_sb_info *sbi = minix_sb(sb);
 324         u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
 325         buf->f_type = sb->s_magic;
 326         buf->f_bsize = 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         buf->f_fsid.val[0] = (u32)id;
 334         buf->f_fsid.val[1] = (u32)(id >> 32);
 335
 336         return 0;
 337 }
 338
 339 static int minix_get_block(struct inode *inode, sector_t block,
 340                     struct buffer_head *bh_result, int create)
 341 {
 342         if (INODE_VERSION(inode) == MINIX_V1)
 343                 return V1_minix_get_block(inode, block, bh_result, create);
 344         else
 345                 return V2_minix_get_block(inode, block, bh_result, create);
 346 }
 347
 348 static int minix_writepage(struct page *page, struct writeback_control *wbc)
 349 {
 350         return block_write_full_page(page, minix_get_block, wbc);
 351 }
 352
 353 static int minix_readpage(struct file *file, struct page *page)
 354 {
 355         return block_read_full_page(page,minix_get_block);
 356 }
 357
 358 int __minix_write_begin(struct file *file, struct address_space *mapping,
 359                         loff_t pos, unsigned len, unsigned flags,
 360                         struct page **pagep, void **fsdata)
 361 {
 362         return block_write_begin(file, mapping, pos, len, flags, pagep, fsdata,
 363                                 minix_get_block);
 364 }
 365
 366 static int minix_write_begin(struct file *file, struct address_space *mapping,
 367                         loff_t pos, unsigned len, unsigned flags,
 368                         struct page **pagep, void **fsdata)
 369 {
 370         *pagep = NULL;
 371         return __minix_write_begin(file, mapping, pos, len, flags, pagep, fsdata);
 372 }
 373
 374 static sector_t minix_bmap(struct address_space *mapping, sector_t block)
 375 {
 376         return generic_block_bmap(mapping,block,minix_get_block);
 377 }
 378
 379 static const struct address_space_operations minix_aops = {
 380         .readpage = minix_readpage,
 381         .writepage = minix_writepage,
 382         .sync_page = block_sync_page,
 383         .write_begin = minix_write_begin,
 384         .write_end = generic_write_end,
 385         .bmap = minix_bmap
 386 };
 387
 388 static const struct inode_operations minix_symlink_inode_operations = {
 389         .readlink       = generic_readlink,
 390         .follow_link    = page_follow_link_light,
 391         .put_link       = page_put_link,
 392         .getattr        = minix_getattr,
 393 };
 394
 395 void minix_set_inode(struct inode *inode, dev_t rdev)
 396 {
 397         if (S_ISREG(inode->i_mode)) {
 398                 inode->i_op = &minix_file_inode_operations;
 399                 inode->i_fop = &minix_file_operations;
 400                 inode->i_mapping->a_ops = &minix_aops;
 401         } else if (S_ISDIR(inode->i_mode)) {
 402                 inode->i_op = &minix_dir_inode_operations;
 403                 inode->i_fop = &minix_dir_operations;
 404                 inode->i_mapping->a_ops = &minix_aops;
 405         } else if (S_ISLNK(inode->i_mode)) {
 406                 inode->i_op = &minix_symlink_inode_operations;
 407                 inode->i_mapping->a_ops = &minix_aops;
 408         } else
 409                 init_special_inode(inode, inode->i_mode, rdev);
 410 }
 411
 412 /*
 413  * The minix V1 function to read an inode.
 414  */
 415 static struct inode *V1_minix_iget(struct inode *inode)
 416 {
 417         struct buffer_head * bh;
 418         struct minix_inode * raw_inode;
 419         struct minix_inode_info *minix_inode = minix_i(inode);
 420         int i;
 421
 422         raw_inode = minix_V1_raw_inode(inode->i_sb, inode->i_ino, &bh);
 423         if (!raw_inode) {
 424                 iget_failed(inode);
 425                 return ERR_PTR(-EIO);
 426         }
 427         inode->i_mode = raw_inode->i_mode;
 428         inode->i_uid = (uid_t)raw_inode->i_uid;
 429         inode->i_gid = (gid_t)raw_inode->i_gid;
 430         inode->i_nlink = raw_inode->i_nlinks;
 431         inode->i_size = raw_inode->i_size;
 432         inode->i_mtime.tv_sec = inode->i_atime.tv_sec = inode->i_ctime.tv_sec = raw_inode->i_time;
 433         inode->i_mtime.tv_nsec = 0;
 434         inode->i_atime.tv_nsec = 0;
 435         inode->i_ctime.tv_nsec = 0;
 436         inode->i_blocks = 0;
 437         for (i = 0; i < 9; i++)
 438                 minix_inode->u.i1_data[i] = raw_inode->i_zone[i];
 439         minix_set_inode(inode, old_decode_dev(raw_inode->i_zone[0]));
 440         brelse(bh);
 441         unlock_new_inode(inode);
 442         return inode;
 443 }
 444
 445 /*
 446  * The minix V2 function to read an inode.
 447  */
 448 static struct inode *V2_minix_iget(struct inode *inode)
 449 {
 450         struct buffer_head * bh;
 451         struct minix2_inode * raw_inode;
 452         struct minix_inode_info *minix_inode = minix_i(inode);
 453         int i;
 454
 455         raw_inode = minix_V2_raw_inode(inode->i_sb, inode->i_ino, &bh);
 456         if (!raw_inode) {
 457                 iget_failed(inode);
 458                 return ERR_PTR(-EIO);
 459         }
 460         inode->i_mode = raw_inode->i_mode;
 461         inode->i_uid = (uid_t)raw_inode->i_uid;
 462         inode->i_gid = (gid_t)raw_inode->i_gid;
 463         inode->i_nlink = raw_inode->i_nlinks;
 464         inode->i_size = raw_inode->i_size;
 465         inode->i_mtime.tv_sec = raw_inode->i_mtime;
 466         inode->i_atime.tv_sec = raw_inode->i_atime;
 467         inode->i_ctime.tv_sec = raw_inode->i_ctime;
 468         inode->i_mtime.tv_nsec = 0;
 469         inode->i_atime.tv_nsec = 0;
 470         inode->i_ctime.tv_nsec = 0;
 471         inode->i_blocks = 0;
 472         for (i = 0; i < 10; i++)
 473                 minix_inode->u.i2_data[i] = raw_inode->i_zone[i];
 474         minix_set_inode(inode, old_decode_dev(raw_inode->i_zone[0]));
 475         brelse(bh);
 476         unlock_new_inode(inode);
 477         return inode;
 478 }
 479
 480 /*
 481  * The global function to read an inode.
 482  */
 483 struct inode *minix_iget(struct super_block *sb, unsigned long ino)
 484 {
 485         struct inode *inode;
 486
 487         inode = iget_locked(sb, ino);
 488         if (!inode)
 489                 return ERR_PTR(-ENOMEM);
 490         if (!(inode->i_state & I_NEW))
 491                 return inode;
 492
 493         if (INODE_VERSION(inode) == MINIX_V1)
 494                 return V1_minix_iget(inode);
 495         else
 496                 return V2_minix_iget(inode);
 497 }
 498
 499 /*
 500  * The minix V1 function to synchronize an inode.
 501  */
 502 static struct buffer_head * V1_minix_update_inode(struct inode * inode)
 503 {
 504         struct buffer_head * bh;
 505         struct minix_inode * raw_inode;
 506         struct minix_inode_info *minix_inode = minix_i(inode);
 507         int i;
 508
 509         raw_inode = minix_V1_raw_inode(inode->i_sb, inode->i_ino, &bh);
 510         if (!raw_inode)
 511                 return NULL;
 512         raw_inode->i_mode = inode->i_mode;
 513         raw_inode->i_uid = fs_high2lowuid(inode->i_uid);
 514         raw_inode->i_gid = fs_high2lowgid(inode->i_gid);
 515         raw_inode->i_nlinks = inode->i_nlink;
 516         raw_inode->i_size = inode->i_size;
 517         raw_inode->i_time = inode->i_mtime.tv_sec;
 518         if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
 519                 raw_inode->i_zone[0] = old_encode_dev(inode->i_rdev);
 520         else for (i = 0; i < 9; i++)
 521                 raw_inode->i_zone[i] = minix_inode->u.i1_data[i];
 522         mark_buffer_dirty(bh);
 523         return bh;
 524 }
 525
 526 /*
 527  * The minix V2 function to synchronize an inode.
 528  */
 529 static struct buffer_head * V2_minix_update_inode(struct inode * inode)
 530 {
 531         struct buffer_head * bh;
 532         struct minix2_inode * raw_inode;
 533         struct minix_inode_info *minix_inode = minix_i(inode);
 534         int i;
 535
 536         raw_inode = minix_V2_raw_inode(inode->i_sb, inode->i_ino, &bh);
 537         if (!raw_inode)
 538                 return NULL;
 539         raw_inode->i_mode = inode->i_mode;
 540         raw_inode->i_uid = fs_high2lowuid(inode->i_uid);
 541         raw_inode->i_gid = fs_high2lowgid(inode->i_gid);
 542         raw_inode->i_nlinks = inode->i_nlink;
 543         raw_inode->i_size = inode->i_size;
 544         raw_inode->i_mtime = inode->i_mtime.tv_sec;
 545         raw_inode->i_atime = inode->i_atime.tv_sec;
 546         raw_inode->i_ctime = inode->i_ctime.tv_sec;
 547         if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
 548                 raw_inode->i_zone[0] = old_encode_dev(inode->i_rdev);
 549         else for (i = 0; i < 10; i++)
 550                 raw_inode->i_zone[i] = minix_inode->u.i2_data[i];
 551         mark_buffer_dirty(bh);
 552         return bh;
 553 }
 554
 555 static int minix_write_inode(struct inode *inode, int wait)
 556 {
 557         int err = 0;
 558         struct buffer_head *bh;
 559
 560         if (INODE_VERSION(inode) == MINIX_V1)
 561                 bh = V1_minix_update_inode(inode);
 562         else
 563                 bh = V2_minix_update_inode(inode);
 564         if (!bh)
 565                 return -EIO;
 566         if (wait && buffer_dirty(bh)) {
 567                 sync_dirty_buffer(bh);
 568                 if (buffer_req(bh) && !buffer_uptodate(bh)) {
 569                         printk("IO error syncing minix inode [%s:%08lx]\n",
 570                                 inode->i_sb->s_id, inode->i_ino);
 571                         err = -EIO;
 572                 }
 573         }
 574         brelse (bh);
 575         return err;
 576 }
 577
 578 int minix_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
 579 {
 580         struct inode *dir = dentry->d_parent->d_inode;
 581         struct super_block *sb = dir->i_sb;
 582         generic_fillattr(dentry->d_inode, stat);
 583         if (INODE_VERSION(dentry->d_inode) == MINIX_V1)
 584                 stat->blocks = (BLOCK_SIZE / 512) * V1_minix_blocks(stat->size, sb);
 585         else
 586                 stat->blocks = (sb->s_blocksize / 512) * V2_minix_blocks(stat->size, sb);
 587         stat->blksize = sb->s_blocksize;
 588         return 0;
 589 }
 590
 591 /*
 592  * The function that is called for file truncation.
 593  */
 594 void minix_truncate(struct inode * inode)
 595 {
 596         if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode)))
 597                 return;
 598         if (INODE_VERSION(inode) == MINIX_V1)
 599                 V1_minix_truncate(inode);
 600         else
 601                 V2_minix_truncate(inode);
 602 }
 603
 604 static int minix_get_sb(struct file_system_type *fs_type,
 605         int flags, const char *dev_name, void *data, struct vfsmount *mnt)
 606 {
 607         return get_sb_bdev(fs_type, flags, dev_name, data, minix_fill_super,
 608                            mnt);
 609 }
 610
 611 static struct file_system_type minix_fs_type = {
 612         .owner          = THIS_MODULE,
 613         .name           = "minix",
 614         .get_sb         = minix_get_sb,
 615         .kill_sb        = kill_block_super,
 616         .fs_flags       = FS_REQUIRES_DEV,
 617 };
 618
 619 static int __init init_minix_fs(void)
 620 {
 621         int err = init_inodecache();
 622         if (err)
 623                 goto out1;
 624         err = register_filesystem(&minix_fs_type);
 625         if (err)
 626                 goto out;
 627         return 0;
 628 out:
 629         destroy_inodecache();
 630 out1:
 631         return err;
 632 }
 633
 634 static void __exit exit_minix_fs(void)
 635 {
 636         unregister_filesystem(&minix_fs_type);
 637         destroy_inodecache();
 638 }
 639
 640 module_init(init_minix_fs)
 641 module_exit(exit_minix_fs)
 642 MODULE_LICENSE("GPL");
 643