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         lock_kernel();
  39
  40         if (!(sb->s_flags & MS_RDONLY)) {
  41                 if (sbi->s_version != MINIX_V3)  /* s_state is now out from V3 sb */
  42                         sbi->s_ms->s_state = sbi->s_mount_state;
  43                 mark_buffer_dirty(sbi->s_sbh);
  44         }
  45         for (i = 0; i < sbi->s_imap_blocks; i++)
  46                 brelse(sbi->s_imap[i]);
  47         for (i = 0; i < sbi->s_zmap_blocks; i++)
  48                 brelse(sbi->s_zmap[i]);
  49         brelse (sbi->s_sbh);
  50         kfree(sbi->s_imap);
  51         sb->s_fs_info = NULL;
  52         kfree(sbi);
  53
  54         unlock_kernel();
  55 }
  56
  57 static struct kmem_cache * minix_inode_cachep;
  58
  59 static struct inode *minix_alloc_inode(struct super_block *sb)
  60 {
  61         struct minix_inode_info *ei;
  62         ei = (struct minix_inode_info *)kmem_cache_alloc(minix_inode_cachep, GFP_KERNEL);
  63         if (!ei)
  64                 return NULL;
  65         return &ei->vfs_inode;
  66 }
  67
  68 static void minix_destroy_inode(struct inode *inode)
  69 {
  70         kmem_cache_free(minix_inode_cachep, minix_i(inode));
  71 }
  72
  73 static void init_once(void *foo)
  74 {
  75         struct minix_inode_info *ei = (struct minix_inode_info *) foo;
  76
  77         inode_init_once(&ei->vfs_inode);
  78 }
  79
  80 static int init_inodecache(void)
  81 {
  82         minix_inode_cachep = kmem_cache_create("minix_inode_cache",
  83                                              sizeof(struct minix_inode_info),
  84                                              0, (SLAB_RECLAIM_ACCOUNT|
  85                                                 SLAB_MEM_SPREAD),
  86                                              init_once);
  87         if (minix_inode_cachep == NULL)
  88                 return -ENOMEM;
  89         return 0;
  90 }
  91
  92 static void destroy_inodecache(void)
  93 {
  94         kmem_cache_destroy(minix_inode_cachep);
  95 }
  96
  97 static const struct super_operations minix_sops = {
  98         .alloc_inode    = minix_alloc_inode,
  99         .destroy_inode  = minix_destroy_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         int ret = -EINVAL;
 153
 154         sbi = kzalloc(sizeof(struct minix_sb_info), GFP_KERNEL);
 155         if (!sbi)
 156                 return -ENOMEM;
 157         s->s_fs_info = sbi;
 158
 159         BUILD_BUG_ON(32 != sizeof (struct minix_inode));
 160         BUILD_BUG_ON(64 != sizeof(struct minix2_inode));
 161
 162         if (!sb_set_blocksize(s, BLOCK_SIZE))
 163                 goto out_bad_hblock;
 164
 165         if (!(bh = sb_bread(s, 1)))
 166                 goto out_bad_sb;
 167
 168         ms = (struct minix_super_block *) bh->b_data;
 169         sbi->s_ms = ms;
 170         sbi->s_sbh = bh;
 171         sbi->s_mount_state = ms->s_state;
 172         sbi->s_ninodes = ms->s_ninodes;
 173         sbi->s_nzones = ms->s_nzones;
 174         sbi->s_imap_blocks = ms->s_imap_blocks;
 175         sbi->s_zmap_blocks = ms->s_zmap_blocks;
 176         sbi->s_firstdatazone = ms->s_firstdatazone;
 177         sbi->s_log_zone_size = ms->s_log_zone_size;
 178         sbi->s_max_size = ms->s_max_size;
 179         s->s_magic = ms->s_magic;
 180         if (s->s_magic == MINIX_SUPER_MAGIC) {
 181                 sbi->s_version = MINIX_V1;
 182                 sbi->s_dirsize = 16;
 183                 sbi->s_namelen = 14;
 184                 sbi->s_link_max = MINIX_LINK_MAX;
 185         } else if (s->s_magic == MINIX_SUPER_MAGIC2) {
 186                 sbi->s_version = MINIX_V1;
 187                 sbi->s_dirsize = 32;
 188                 sbi->s_namelen = 30;
 189                 sbi->s_link_max = MINIX_LINK_MAX;
 190         } else if (s->s_magic == MINIX2_SUPER_MAGIC) {
 191                 sbi->s_version = MINIX_V2;
 192                 sbi->s_nzones = ms->s_zones;
 193                 sbi->s_dirsize = 16;
 194                 sbi->s_namelen = 14;
 195                 sbi->s_link_max = MINIX2_LINK_MAX;
 196         } else if (s->s_magic == MINIX2_SUPER_MAGIC2) {
 197                 sbi->s_version = MINIX_V2;
 198                 sbi->s_nzones = ms->s_zones;
 199                 sbi->s_dirsize = 32;
 200                 sbi->s_namelen = 30;
 201                 sbi->s_link_max = MINIX2_LINK_MAX;
 202         } else if ( *(__u16 *)(bh->b_data + 24) == MINIX3_SUPER_MAGIC) {
 203                 m3s = (struct minix3_super_block *) bh->b_data;
 204                 s->s_magic = m3s->s_magic;
 205                 sbi->s_imap_blocks = m3s->s_imap_blocks;
 206                 sbi->s_zmap_blocks = m3s->s_zmap_blocks;
 207                 sbi->s_firstdatazone = m3s->s_firstdatazone;
 208                 sbi->s_log_zone_size = m3s->s_log_zone_size;
 209                 sbi->s_max_size = m3s->s_max_size;
 210                 sbi->s_ninodes = m3s->s_ninodes;
 211                 sbi->s_nzones = m3s->s_zones;
 212                 sbi->s_dirsize = 64;
 213                 sbi->s_namelen = 60;
 214                 sbi->s_version = MINIX_V3;
 215                 sbi->s_link_max = MINIX2_LINK_MAX;
 216                 sbi->s_mount_state = MINIX_VALID_FS;
 217                 sb_set_blocksize(s, m3s->s_blocksize);
 218         } else
 219                 goto out_no_fs;
 220
 221         /*
 222          * Allocate the buffer map to keep the superblock small.
 223          */
 224         if (sbi->s_imap_blocks == 0 || sbi->s_zmap_blocks == 0)
 225                 goto out_illegal_sb;
 226         i = (sbi->s_imap_blocks + sbi->s_zmap_blocks) * sizeof(bh);
 227         map = kzalloc(i, GFP_KERNEL);
 228         if (!map)
 229                 goto out_no_map;
 230         sbi->s_imap = &map[0];
 231         sbi->s_zmap = &map[sbi->s_imap_blocks];
 232
 233         block=2;
 234         for (i=0 ; i < sbi->s_imap_blocks ; i++) {
 235                 if (!(sbi->s_imap[i]=sb_bread(s, block)))
 236                         goto out_no_bitmap;
 237                 block++;
 238         }
 239         for (i=0 ; i < sbi->s_zmap_blocks ; i++) {
 240                 if (!(sbi->s_zmap[i]=sb_bread(s, block)))
 241                         goto out_no_bitmap;
 242                 block++;
 243         }
 244
 245         minix_set_bit(0,sbi->s_imap[0]->b_data);
 246         minix_set_bit(0,sbi->s_zmap[0]->b_data);
 247
 248         /* set up enough so that it can read an inode */
 249         s->s_op = &minix_sops;
 250         root_inode = minix_iget(s, MINIX_ROOT_INO);
 251         if (IS_ERR(root_inode)) {
 252                 ret = PTR_ERR(root_inode);
 253                 goto out_no_root;
 254         }
 255
 256         ret = -ENOMEM;
 257         s->s_root = d_alloc_root(root_inode);
 258         if (!s->s_root)
 259                 goto out_iput;
 260
 261         if (!(s->s_flags & MS_RDONLY)) {
 262                 if (sbi->s_version != MINIX_V3) /* s_state is now out from V3 sb */
 263                         ms->s_state &= ~MINIX_VALID_FS;
 264                 mark_buffer_dirty(bh);
 265         }
 266         if (!(sbi->s_mount_state & MINIX_VALID_FS))
 267                 printk("MINIX-fs: mounting unchecked file system, "
 268                         "running fsck is recommended\n");
 269         else if (sbi->s_mount_state & MINIX_ERROR_FS)
 270                 printk("MINIX-fs: mounting file system with errors, "
 271                         "running fsck is recommended\n");
 272         return 0;
 273
 274 out_iput:
 275         iput(root_inode);
 276         goto out_freemap;
 277
 278 out_no_root:
 279         if (!silent)
 280                 printk("MINIX-fs: get root inode failed\n");
 281         goto out_freemap;
 282
 283 out_no_bitmap:
 284         printk("MINIX-fs: bad superblock or unable to read bitmaps\n");
 285 out_freemap:
 286         for (i = 0; i < sbi->s_imap_blocks; i++)
 287                 brelse(sbi->s_imap[i]);
 288         for (i = 0; i < sbi->s_zmap_blocks; i++)
 289                 brelse(sbi->s_zmap[i]);
 290         kfree(sbi->s_imap);
 291         goto out_release;
 292
 293 out_no_map:
 294         ret = -ENOMEM;
 295         if (!silent)
 296                 printk("MINIX-fs: can't allocate map\n");
 297         goto out_release;
 298
 299 out_illegal_sb:
 300         if (!silent)
 301                 printk("MINIX-fs: bad superblock\n");
 302         goto out_release;
 303
 304 out_no_fs:
 305         if (!silent)
 306                 printk("VFS: Can't find a Minix filesystem V1 | V2 | V3 "
 307                        "on device %s.\n", s->s_id);
 308 out_release:
 309         brelse(bh);
 310         goto out;
 311
 312 out_bad_hblock:
 313         printk("MINIX-fs: blocksize too small for device\n");
 314         goto out;
 315
 316 out_bad_sb:
 317         printk("MINIX-fs: unable to read superblock\n");
 318 out:
 319         s->s_fs_info = NULL;
 320         kfree(sbi);
 321         return ret;
 322 }
 323
 324 static int minix_statfs(struct dentry *dentry, struct kstatfs *buf)
 325 {
 326         struct super_block *sb = dentry->d_sb;
 327         struct minix_sb_info *sbi = minix_sb(sb);
 328         u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
 329         buf->f_type = sb->s_magic;
 330         buf->f_bsize = sb->s_blocksize;
 331         buf->f_blocks = (sbi->s_nzones - sbi->s_firstdatazone) << sbi->s_log_zone_size;
 332         buf->f_bfree = minix_count_free_blocks(sbi);
 333         buf->f_bavail = buf->f_bfree;
 334         buf->f_files = sbi->s_ninodes;
 335         buf->f_ffree = minix_count_free_inodes(sbi);
 336         buf->f_namelen = sbi->s_namelen;
 337         buf->f_fsid.val[0] = (u32)id;
 338         buf->f_fsid.val[1] = (u32)(id >> 32);
 339
 340         return 0;
 341 }
 342
 343 static int minix_get_block(struct inode *inode, sector_t block,
 344                     struct buffer_head *bh_result, int create)
 345 {
 346         if (INODE_VERSION(inode) == MINIX_V1)
 347                 return V1_minix_get_block(inode, block, bh_result, create);
 348         else
 349                 return V2_minix_get_block(inode, block, bh_result, create);
 350 }
 351
 352 static int minix_writepage(struct page *page, struct writeback_control *wbc)
 353 {
 354         return block_write_full_page(page, minix_get_block, wbc);
 355 }
 356
 357 static int minix_readpage(struct file *file, struct page *page)
 358 {
 359         return block_read_full_page(page,minix_get_block);
 360 }
 361
 362 int __minix_write_begin(struct file *file, struct address_space *mapping,
 363                         loff_t pos, unsigned len, unsigned flags,
 364                         struct page **pagep, void **fsdata)
 365 {
 366         return block_write_begin(file, mapping, pos, len, flags, pagep, fsdata,
 367                                 minix_get_block);
 368 }
 369
 370 static int minix_write_begin(struct file *file, struct address_space *mapping,
 371                         loff_t pos, unsigned len, unsigned flags,
 372                         struct page **pagep, void **fsdata)
 373 {
 374         *pagep = NULL;
 375         return __minix_write_begin(file, mapping, pos, len, flags, pagep, fsdata);
 376 }
 377
 378 static sector_t minix_bmap(struct address_space *mapping, sector_t block)
 379 {
 380         return generic_block_bmap(mapping,block,minix_get_block);
 381 }
 382
 383 static const struct address_space_operations minix_aops = {
 384         .readpage = minix_readpage,
 385         .writepage = minix_writepage,
 386         .sync_page = block_sync_page,
 387         .write_begin = minix_write_begin,
 388         .write_end = generic_write_end,
 389         .bmap = minix_bmap
 390 };
 391
 392 static const struct inode_operations minix_symlink_inode_operations = {
 393         .readlink       = generic_readlink,
 394         .follow_link    = page_follow_link_light,
 395         .put_link       = page_put_link,
 396         .getattr        = minix_getattr,
 397 };
 398
 399 void minix_set_inode(struct inode *inode, dev_t rdev)
 400 {
 401         if (S_ISREG(inode->i_mode)) {
 402                 inode->i_op = &minix_file_inode_operations;
 403                 inode->i_fop = &minix_file_operations;
 404                 inode->i_mapping->a_ops = &minix_aops;
 405         } else if (S_ISDIR(inode->i_mode)) {
 406                 inode->i_op = &minix_dir_inode_operations;
 407                 inode->i_fop = &minix_dir_operations;
 408                 inode->i_mapping->a_ops = &minix_aops;
 409         } else if (S_ISLNK(inode->i_mode)) {
 410                 inode->i_op = &minix_symlink_inode_operations;
 411                 inode->i_mapping->a_ops = &minix_aops;
 412         } else
 413                 init_special_inode(inode, inode->i_mode, rdev);
 414 }
 415
 416 /*
 417  * The minix V1 function to read an inode.
 418  */
 419 static struct inode *V1_minix_iget(struct inode *inode)
 420 {
 421         struct buffer_head * bh;
 422         struct minix_inode * raw_inode;
 423         struct minix_inode_info *minix_inode = minix_i(inode);
 424         int i;
 425
 426         raw_inode = minix_V1_raw_inode(inode->i_sb, inode->i_ino, &bh);
 427         if (!raw_inode) {
 428                 iget_failed(inode);
 429                 return ERR_PTR(-EIO);
 430         }
 431         inode->i_mode = raw_inode->i_mode;
 432         inode->i_uid = (uid_t)raw_inode->i_uid;
 433         inode->i_gid = (gid_t)raw_inode->i_gid;
 434         inode->i_nlink = raw_inode->i_nlinks;
 435         inode->i_size = raw_inode->i_size;
 436         inode->i_mtime.tv_sec = inode->i_atime.tv_sec = inode->i_ctime.tv_sec = raw_inode->i_time;
 437         inode->i_mtime.tv_nsec = 0;
 438         inode->i_atime.tv_nsec = 0;
 439         inode->i_ctime.tv_nsec = 0;
 440         inode->i_blocks = 0;
 441         for (i = 0; i < 9; i++)
 442                 minix_inode->u.i1_data[i] = raw_inode->i_zone[i];
 443         minix_set_inode(inode, old_decode_dev(raw_inode->i_zone[0]));
 444         brelse(bh);
 445         unlock_new_inode(inode);
 446         return inode;
 447 }
 448
 449 /*
 450  * The minix V2 function to read an inode.
 451  */
 452 static struct inode *V2_minix_iget(struct inode *inode)
 453 {
 454         struct buffer_head * bh;
 455         struct minix2_inode * raw_inode;
 456         struct minix_inode_info *minix_inode = minix_i(inode);
 457         int i;
 458
 459         raw_inode = minix_V2_raw_inode(inode->i_sb, inode->i_ino, &bh);
 460         if (!raw_inode) {
 461                 iget_failed(inode);
 462                 return ERR_PTR(-EIO);
 463         }
 464         inode->i_mode = raw_inode->i_mode;
 465         inode->i_uid = (uid_t)raw_inode->i_uid;
 466         inode->i_gid = (gid_t)raw_inode->i_gid;
 467         inode->i_nlink = raw_inode->i_nlinks;
 468         inode->i_size = raw_inode->i_size;
 469         inode->i_mtime.tv_sec = raw_inode->i_mtime;
 470         inode->i_atime.tv_sec = raw_inode->i_atime;
 471         inode->i_ctime.tv_sec = raw_inode->i_ctime;
 472         inode->i_mtime.tv_nsec = 0;
 473         inode->i_atime.tv_nsec = 0;
 474         inode->i_ctime.tv_nsec = 0;
 475         inode->i_blocks = 0;
 476         for (i = 0; i < 10; i++)
 477                 minix_inode->u.i2_data[i] = raw_inode->i_zone[i];
 478         minix_set_inode(inode, old_decode_dev(raw_inode->i_zone[0]));
 479         brelse(bh);
 480         unlock_new_inode(inode);
 481         return inode;
 482 }
 483
 484 /*
 485  * The global function to read an inode.
 486  */
 487 struct inode *minix_iget(struct super_block *sb, unsigned long ino)
 488 {
 489         struct inode *inode;
 490
 491         inode = iget_locked(sb, ino);
 492         if (!inode)
 493                 return ERR_PTR(-ENOMEM);
 494         if (!(inode->i_state & I_NEW))
 495                 return inode;
 496
 497         if (INODE_VERSION(inode) == MINIX_V1)
 498                 return V1_minix_iget(inode);
 499         else
 500                 return V2_minix_iget(inode);
 501 }
 502
 503 /*
 504  * The minix V1 function to synchronize an inode.
 505  */
 506 static struct buffer_head * V1_minix_update_inode(struct inode * inode)
 507 {
 508         struct buffer_head * bh;
 509         struct minix_inode * raw_inode;
 510         struct minix_inode_info *minix_inode = minix_i(inode);
 511         int i;
 512
 513         raw_inode = minix_V1_raw_inode(inode->i_sb, inode->i_ino, &bh);
 514         if (!raw_inode)
 515                 return NULL;
 516         raw_inode->i_mode = inode->i_mode;
 517         raw_inode->i_uid = fs_high2lowuid(inode->i_uid);
 518         raw_inode->i_gid = fs_high2lowgid(inode->i_gid);
 519         raw_inode->i_nlinks = inode->i_nlink;
 520         raw_inode->i_size = inode->i_size;
 521         raw_inode->i_time = inode->i_mtime.tv_sec;
 522         if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
 523                 raw_inode->i_zone[0] = old_encode_dev(inode->i_rdev);
 524         else for (i = 0; i < 9; i++)
 525                 raw_inode->i_zone[i] = minix_inode->u.i1_data[i];
 526         mark_buffer_dirty(bh);
 527         return bh;
 528 }
 529
 530 /*
 531  * The minix V2 function to synchronize an inode.
 532  */
 533 static struct buffer_head * V2_minix_update_inode(struct inode * inode)
 534 {
 535         struct buffer_head * bh;
 536         struct minix2_inode * raw_inode;
 537         struct minix_inode_info *minix_inode = minix_i(inode);
 538         int i;
 539
 540         raw_inode = minix_V2_raw_inode(inode->i_sb, inode->i_ino, &bh);
 541         if (!raw_inode)
 542                 return NULL;
 543         raw_inode->i_mode = inode->i_mode;
 544         raw_inode->i_uid = fs_high2lowuid(inode->i_uid);
 545         raw_inode->i_gid = fs_high2lowgid(inode->i_gid);
 546         raw_inode->i_nlinks = inode->i_nlink;
 547         raw_inode->i_size = inode->i_size;
 548         raw_inode->i_mtime = inode->i_mtime.tv_sec;
 549         raw_inode->i_atime = inode->i_atime.tv_sec;
 550         raw_inode->i_ctime = inode->i_ctime.tv_sec;
 551         if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
 552                 raw_inode->i_zone[0] = old_encode_dev(inode->i_rdev);
 553         else for (i = 0; i < 10; i++)
 554                 raw_inode->i_zone[i] = minix_inode->u.i2_data[i];
 555         mark_buffer_dirty(bh);
 556         return bh;
 557 }
 558
 559 static struct buffer_head *minix_update_inode(struct inode *inode)
 560 {
 561         if (INODE_VERSION(inode) == MINIX_V1)
 562                 return V1_minix_update_inode(inode);
 563         else
 564                 return V2_minix_update_inode(inode);
 565 }
 566
 567 static int minix_write_inode(struct inode * inode, int wait)
 568 {
 569         brelse(minix_update_inode(inode));
 570         return 0;
 571 }
 572
 573 int minix_sync_inode(struct inode * inode)
 574 {
 575         int err = 0;
 576         struct buffer_head *bh;
 577
 578         bh = minix_update_inode(inode);
 579         if (bh && buffer_dirty(bh))
 580         {
 581                 sync_dirty_buffer(bh);
 582                 if (buffer_req(bh) && !buffer_uptodate(bh))
 583                 {
 584                         printk("IO error syncing minix inode [%s:%08lx]\n",
 585                                 inode->i_sb->s_id, inode->i_ino);
 586                         err = -1;
 587                 }
 588         }
 589         else if (!bh)
 590                 err = -1;
 591         brelse (bh);
 592         return err;
 593 }
 594
 595 int minix_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
 596 {
 597         struct inode *dir = dentry->d_parent->d_inode;
 598         struct super_block *sb = dir->i_sb;
 599         generic_fillattr(dentry->d_inode, stat);
 600         if (INODE_VERSION(dentry->d_inode) == MINIX_V1)
 601                 stat->blocks = (BLOCK_SIZE / 512) * V1_minix_blocks(stat->size, sb);
 602         else
 603                 stat->blocks = (sb->s_blocksize / 512) * V2_minix_blocks(stat->size, sb);
 604         stat->blksize = sb->s_blocksize;
 605         return 0;
 606 }
 607
 608 /*
 609  * The function that is called for file truncation.
 610  */
 611 void minix_truncate(struct inode * inode)
 612 {
 613         if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode)))
 614                 return;
 615         if (INODE_VERSION(inode) == MINIX_V1)
 616                 V1_minix_truncate(inode);
 617         else
 618                 V2_minix_truncate(inode);
 619 }
 620
 621 static int minix_get_sb(struct file_system_type *fs_type,
 622         int flags, const char *dev_name, void *data, struct vfsmount *mnt)
 623 {
 624         return get_sb_bdev(fs_type, flags, dev_name, data, minix_fill_super,
 625                            mnt);
 626 }
 627
 628 static struct file_system_type minix_fs_type = {
 629         .owner          = THIS_MODULE,
 630         .name           = "minix",
 631         .get_sb         = minix_get_sb,
 632         .kill_sb        = kill_block_super,
 633         .fs_flags       = FS_REQUIRES_DEV,
 634 };
 635
 636 static int __init init_minix_fs(void)
 637 {
 638         int err = init_inodecache();
 639         if (err)
 640                 goto out1;
 641         err = register_filesystem(&minix_fs_type);
 642         if (err)
 643                 goto out;
 644         return 0;
 645 out:
 646         destroy_inodecache();
 647 out1:
 648         return err;
 649 }
 650
 651 static void __exit exit_minix_fs(void)
 652 {
 653         unregister_filesystem(&minix_fs_type);
 654         destroy_inodecache();
 655 }
 656
 657 module_init(init_minix_fs)
 658 module_exit(exit_minix_fs)
 659 MODULE_LICENSE("GPL");
 660