release/src-rt-6.x.4708/linux/linux-2.6.36/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 #include <linux/writeback.h>
  21
  22 static int minix_write_inode(struct inode *inode,
  23                 struct writeback_control *wbc);
  24 static int minix_statfs(struct dentry *dentry, struct kstatfs *buf);
  25 static int minix_remount (struct super_block * sb, int * flags, char * data);
  26
  27 static void minix_evict_inode(struct inode *inode)
  28 {
  29         truncate_inode_pages(&inode->i_data, 0);
  30         if (!inode->i_nlink) {
  31                 inode->i_size = 0;
  32                 minix_truncate(inode);
  33         }
  34         invalidate_inode_buffers(inode);
  35         end_writeback(inode);
  36         if (!inode->i_nlink)
  37                 minix_free_inode(inode);
  38 }
  39
  40 static void minix_put_super(struct super_block *sb)
  41 {
  42         int i;
  43         struct minix_sb_info *sbi = minix_sb(sb);
  44
  45         if (!(sb->s_flags & MS_RDONLY)) {
  46                 if (sbi->s_version != MINIX_V3)  /* s_state is now out from V3 sb */
  47                         sbi->s_ms->s_state = sbi->s_mount_state;
  48                 mark_buffer_dirty(sbi->s_sbh);
  49         }
  50         for (i = 0; i < sbi->s_imap_blocks; i++)
  51                 brelse(sbi->s_imap[i]);
  52         for (i = 0; i < sbi->s_zmap_blocks; i++)
  53                 brelse(sbi->s_zmap[i]);
  54         brelse (sbi->s_sbh);
  55         kfree(sbi->s_imap);
  56         sb->s_fs_info = NULL;
  57         kfree(sbi);
  58 }
  59
  60 static struct kmem_cache * minix_inode_cachep;
  61
  62 static struct inode *minix_alloc_inode(struct super_block *sb)
  63 {
  64         struct minix_inode_info *ei;
  65         ei = (struct minix_inode_info *)kmem_cache_alloc(minix_inode_cachep, GFP_KERNEL);
  66         if (!ei)
  67                 return NULL;
  68         return &ei->vfs_inode;
  69 }
  70
  71 static void minix_destroy_inode(struct inode *inode)
  72 {
  73         kmem_cache_free(minix_inode_cachep, minix_i(inode));
  74 }
  75
  76 static void init_once(void *foo)
  77 {
  78         struct minix_inode_info *ei = (struct minix_inode_info *) foo;
  79
  80         inode_init_once(&ei->vfs_inode);
  81 }
  82
  83 static int init_inodecache(void)
  84 {
  85         minix_inode_cachep = kmem_cache_create("minix_inode_cache",
  86                                              sizeof(struct minix_inode_info),
  87                                              0, (SLAB_RECLAIM_ACCOUNT|
  88                                                 SLAB_MEM_SPREAD),
  89                                              init_once);
  90         if (minix_inode_cachep == NULL)
  91                 return -ENOMEM;
  92         return 0;
  93 }
  94
  95 static void destroy_inodecache(void)
  96 {
  97         kmem_cache_destroy(minix_inode_cachep);
  98 }
  99
 100 static const struct super_operations minix_sops = {
 101         .alloc_inode    = minix_alloc_inode,
 102         .destroy_inode  = minix_destroy_inode,
 103         .write_inode    = minix_write_inode,
 104         .evict_inode    = minix_evict_inode,
 105         .put_super      = minix_put_super,
 106         .statfs         = minix_statfs,
 107         .remount_fs     = minix_remount,
 108 };
 109
 110 static int minix_remount (struct super_block * sb, int * flags, char * data)
 111 {
 112         struct minix_sb_info * sbi = minix_sb(sb);
 113         struct minix_super_block * ms;
 114
 115         ms = sbi->s_ms;
 116         if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
 117                 return 0;
 118         if (*flags & MS_RDONLY) {
 119                 if (ms->s_state & MINIX_VALID_FS ||
 120                     !(sbi->s_mount_state & MINIX_VALID_FS))
 121                         return 0;
 122                 /* Mounting a rw partition read-only. */
 123                 if (sbi->s_version != MINIX_V3)
 124                         ms->s_state = sbi->s_mount_state;
 125                 mark_buffer_dirty(sbi->s_sbh);
 126         } else {
 127                 /* Mount a partition which is read-only, read-write. */
 128                 if (sbi->s_version != MINIX_V3) {
 129                         sbi->s_mount_state = ms->s_state;
 130                         ms->s_state &= ~MINIX_VALID_FS;
 131                 } else {
 132                         sbi->s_mount_state = MINIX_VALID_FS;
 133                 }
 134                 mark_buffer_dirty(sbi->s_sbh);
 135
 136                 if (!(sbi->s_mount_state & MINIX_VALID_FS))
 137                         printk("MINIX-fs warning: remounting unchecked fs, "
 138                                 "running fsck is recommended\n");
 139                 else if ((sbi->s_mount_state & MINIX_ERROR_FS))
 140                         printk("MINIX-fs warning: remounting fs with errors, "
 141                                 "running fsck is recommended\n");
 142         }
 143         return 0;
 144 }
 145
 146 static int minix_fill_super(struct super_block *s, void *data, int silent)
 147 {
 148         struct buffer_head *bh;
 149         struct buffer_head **map;
 150         struct minix_super_block *ms;
 151         struct minix3_super_block *m3s = NULL;
 152         unsigned long i, block;
 153         struct inode *root_inode;
 154         struct minix_sb_info *sbi;
 155         int ret = -EINVAL;
 156
 157         sbi = kzalloc(sizeof(struct minix_sb_info), GFP_KERNEL);
 158         if (!sbi)
 159                 return -ENOMEM;
 160         s->s_fs_info = sbi;
 161
 162         BUILD_BUG_ON(32 != sizeof (struct minix_inode));
 163         BUILD_BUG_ON(64 != sizeof(struct minix2_inode));
 164
 165         if (!sb_set_blocksize(s, BLOCK_SIZE))
 166                 goto out_bad_hblock;
 167
 168         if (!(bh = sb_bread(s, 1)))
 169                 goto out_bad_sb;
 170
 171         ms = (struct minix_super_block *) bh->b_data;
 172         sbi->s_ms = ms;
 173         sbi->s_sbh = bh;
 174         sbi->s_mount_state = ms->s_state;
 175         sbi->s_ninodes = ms->s_ninodes;
 176         sbi->s_nzones = ms->s_nzones;
 177         sbi->s_imap_blocks = ms->s_imap_blocks;
 178         sbi->s_zmap_blocks = ms->s_zmap_blocks;
 179         sbi->s_firstdatazone = ms->s_firstdatazone;
 180         sbi->s_log_zone_size = ms->s_log_zone_size;
 181         sbi->s_max_size = ms->s_max_size;
 182         s->s_magic = ms->s_magic;
 183         if (s->s_magic == MINIX_SUPER_MAGIC) {
 184                 sbi->s_version = MINIX_V1;
 185                 sbi->s_dirsize = 16;
 186                 sbi->s_namelen = 14;
 187                 sbi->s_link_max = MINIX_LINK_MAX;
 188         } else if (s->s_magic == MINIX_SUPER_MAGIC2) {
 189                 sbi->s_version = MINIX_V1;
 190                 sbi->s_dirsize = 32;
 191                 sbi->s_namelen = 30;
 192                 sbi->s_link_max = MINIX_LINK_MAX;
 193         } else if (s->s_magic == MINIX2_SUPER_MAGIC) {
 194                 sbi->s_version = MINIX_V2;
 195                 sbi->s_nzones = ms->s_zones;
 196                 sbi->s_dirsize = 16;
 197                 sbi->s_namelen = 14;
 198                 sbi->s_link_max = MINIX2_LINK_MAX;
 199         } else if (s->s_magic == MINIX2_SUPER_MAGIC2) {
 200                 sbi->s_version = MINIX_V2;
 201                 sbi->s_nzones = ms->s_zones;
 202                 sbi->s_dirsize = 32;
 203                 sbi->s_namelen = 30;
 204                 sbi->s_link_max = MINIX2_LINK_MAX;
 205         } else if ( *(__u16 *)(bh->b_data + 24) == MINIX3_SUPER_MAGIC) {
 206                 m3s = (struct minix3_super_block *) bh->b_data;
 207                 s->s_magic = m3s->s_magic;
 208                 sbi->s_imap_blocks = m3s->s_imap_blocks;
 209                 sbi->s_zmap_blocks = m3s->s_zmap_blocks;
 210                 sbi->s_firstdatazone = m3s->s_firstdatazone;
 211                 sbi->s_log_zone_size = m3s->s_log_zone_size;
 212                 sbi->s_max_size = m3s->s_max_size;
 213                 sbi->s_ninodes = m3s->s_ninodes;
 214                 sbi->s_nzones = m3s->s_zones;
 215                 sbi->s_dirsize = 64;
 216                 sbi->s_namelen = 60;
 217                 sbi->s_version = MINIX_V3;
 218                 sbi->s_link_max = MINIX2_LINK_MAX;
 219                 sbi->s_mount_state = MINIX_VALID_FS;
 220                 sb_set_blocksize(s, m3s->s_blocksize);
 221         } else
 222                 goto out_no_fs;
 223
 224         /*
 225          * Allocate the buffer map to keep the superblock small.
 226          */
 227         if (sbi->s_imap_blocks == 0 || sbi->s_zmap_blocks == 0)
 228                 goto out_illegal_sb;
 229         i = (sbi->s_imap_blocks + sbi->s_zmap_blocks) * sizeof(bh);
 230         map = kzalloc(i, GFP_KERNEL);
 231         if (!map)
 232                 goto out_no_map;
 233         sbi->s_imap = &map[0];
 234         sbi->s_zmap = &map[sbi->s_imap_blocks];
 235
 236         block=2;
 237         for (i=0 ; i < sbi->s_imap_blocks ; i++) {
 238                 if (!(sbi->s_imap[i]=sb_bread(s, block)))
 239                         goto out_no_bitmap;
 240                 block++;
 241         }
 242         for (i=0 ; i < sbi->s_zmap_blocks ; i++) {
 243                 if (!(sbi->s_zmap[i]=sb_bread(s, block)))
 244                         goto out_no_bitmap;
 245                 block++;
 246         }
 247
 248         minix_set_bit(0,sbi->s_imap[0]->b_data);
 249         minix_set_bit(0,sbi->s_zmap[0]->b_data);
 250
 251         /* set up enough so that it can read an inode */
 252         s->s_op = &minix_sops;
 253         root_inode = minix_iget(s, MINIX_ROOT_INO);
 254         if (IS_ERR(root_inode)) {
 255                 ret = PTR_ERR(root_inode);
 256                 goto out_no_root;
 257         }
 258
 259         ret = -ENOMEM;
 260         s->s_root = d_alloc_root(root_inode);
 261         if (!s->s_root)
 262                 goto out_iput;
 263
 264         if (!(s->s_flags & MS_RDONLY)) {
 265                 if (sbi->s_version != MINIX_V3) /* s_state is now out from V3 sb */
 266                         ms->s_state &= ~MINIX_VALID_FS;
 267                 mark_buffer_dirty(bh);
 268         }
 269         if (!(sbi->s_mount_state & MINIX_VALID_FS))
 270                 printk("MINIX-fs: mounting unchecked file system, "
 271                         "running fsck is recommended\n");
 272         else if (sbi->s_mount_state & MINIX_ERROR_FS)
 273                 printk("MINIX-fs: mounting file system with errors, "
 274                         "running fsck is recommended\n");
 275         return 0;
 276
 277 out_iput:
 278         iput(root_inode);
 279         goto out_freemap;
 280
 281 out_no_root:
 282         if (!silent)
 283                 printk("MINIX-fs: get root inode failed\n");
 284         goto out_freemap;
 285
 286 out_no_bitmap:
 287         printk("MINIX-fs: bad superblock or unable to read bitmaps\n");
 288 out_freemap:
 289         for (i = 0; i < sbi->s_imap_blocks; i++)
 290                 brelse(sbi->s_imap[i]);
 291         for (i = 0; i < sbi->s_zmap_blocks; i++)
 292                 brelse(sbi->s_zmap[i]);
 293         kfree(sbi->s_imap);
 294         goto out_release;
 295
 296 out_no_map:
 297         ret = -ENOMEM;
 298         if (!silent)
 299                 printk("MINIX-fs: can't allocate map\n");
 300         goto out_release;
 301
 302 out_illegal_sb:
 303         if (!silent)
 304                 printk("MINIX-fs: bad superblock\n");
 305         goto out_release;
 306
 307 out_no_fs:
 308         if (!silent)
 309                 printk("VFS: Can't find a Minix filesystem V1 | V2 | V3 "
 310                        "on device %s.\n", s->s_id);
 311 out_release:
 312         brelse(bh);
 313         goto out;
 314
 315 out_bad_hblock:
 316         printk("MINIX-fs: blocksize too small for device\n");
 317         goto out;
 318
 319 out_bad_sb:
 320         printk("MINIX-fs: unable to read superblock\n");
 321 out:
 322         s->s_fs_info = NULL;
 323         kfree(sbi);
 324         return ret;
 325 }
 326
 327 static int minix_statfs(struct dentry *dentry, struct kstatfs *buf)
 328 {
 329         struct super_block *sb = dentry->d_sb;
 330         struct minix_sb_info *sbi = minix_sb(sb);
 331         u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
 332         buf->f_type = sb->s_magic;
 333         buf->f_bsize = sb->s_blocksize;
 334         buf->f_blocks = (sbi->s_nzones - sbi->s_firstdatazone) << sbi->s_log_zone_size;
 335         buf->f_bfree = minix_count_free_blocks(sbi);
 336         buf->f_bavail = buf->f_bfree;
 337         buf->f_files = sbi->s_ninodes;
 338         buf->f_ffree = minix_count_free_inodes(sbi);
 339         buf->f_namelen = sbi->s_namelen;
 340         buf->f_fsid.val[0] = (u32)id;
 341         buf->f_fsid.val[1] = (u32)(id >> 32);
 342
 343         return 0;
 344 }
 345
 346 static int minix_get_block(struct inode *inode, sector_t block,
 347                     struct buffer_head *bh_result, int create)
 348 {
 349         if (INODE_VERSION(inode) == MINIX_V1)
 350                 return V1_minix_get_block(inode, block, bh_result, create);
 351         else
 352                 return V2_minix_get_block(inode, block, bh_result, create);
 353 }
 354
 355 static int minix_writepage(struct page *page, struct writeback_control *wbc)
 356 {
 357         return block_write_full_page(page, minix_get_block, wbc);
 358 }
 359
 360 static int minix_readpage(struct file *file, struct page *page)
 361 {
 362         return block_read_full_page(page,minix_get_block);
 363 }
 364
 365 int minix_prepare_chunk(struct page *page, loff_t pos, unsigned len)
 366 {
 367         return __block_write_begin(page, pos, len, 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         int ret;
 375
 376         ret = block_write_begin(mapping, pos, len, flags, pagep,
 377                                 minix_get_block);
 378         if (unlikely(ret)) {
 379                 loff_t isize = mapping->host->i_size;
 380                 if (pos + len > isize)
 381                         vmtruncate(mapping->host, isize);
 382         }
 383
 384         return ret;
 385 }
 386
 387 static sector_t minix_bmap(struct address_space *mapping, sector_t block)
 388 {
 389         return generic_block_bmap(mapping,block,minix_get_block);
 390 }
 391
 392 static const struct address_space_operations minix_aops = {
 393         .readpage = minix_readpage,
 394         .writepage = minix_writepage,
 395         .sync_page = block_sync_page,
 396         .write_begin = minix_write_begin,
 397         .write_end = generic_write_end,
 398         .bmap = minix_bmap
 399 };
 400
 401 static const struct inode_operations minix_symlink_inode_operations = {
 402         .readlink       = generic_readlink,
 403         .follow_link    = page_follow_link_light,
 404         .put_link       = page_put_link,
 405         .getattr        = minix_getattr,
 406 };
 407
 408 void minix_set_inode(struct inode *inode, dev_t rdev)
 409 {
 410         if (S_ISREG(inode->i_mode)) {
 411                 inode->i_op = &minix_file_inode_operations;
 412                 inode->i_fop = &minix_file_operations;
 413                 inode->i_mapping->a_ops = &minix_aops;
 414         } else if (S_ISDIR(inode->i_mode)) {
 415                 inode->i_op = &minix_dir_inode_operations;
 416                 inode->i_fop = &minix_dir_operations;
 417                 inode->i_mapping->a_ops = &minix_aops;
 418         } else if (S_ISLNK(inode->i_mode)) {
 419                 inode->i_op = &minix_symlink_inode_operations;
 420                 inode->i_mapping->a_ops = &minix_aops;
 421         } else
 422                 init_special_inode(inode, inode->i_mode, rdev);
 423 }
 424
 425 /*
 426  * The minix V1 function to read an inode.
 427  */
 428 static struct inode *V1_minix_iget(struct inode *inode)
 429 {
 430         struct buffer_head * bh;
 431         struct minix_inode * raw_inode;
 432         struct minix_inode_info *minix_inode = minix_i(inode);
 433         int i;
 434
 435         raw_inode = minix_V1_raw_inode(inode->i_sb, inode->i_ino, &bh);
 436         if (!raw_inode) {
 437                 iget_failed(inode);
 438                 return ERR_PTR(-EIO);
 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 = inode->i_atime.tv_sec = inode->i_ctime.tv_sec = raw_inode->i_time;
 446         inode->i_mtime.tv_nsec = 0;
 447         inode->i_atime.tv_nsec = 0;
 448         inode->i_ctime.tv_nsec = 0;
 449         inode->i_blocks = 0;
 450         for (i = 0; i < 9; i++)
 451                 minix_inode->u.i1_data[i] = raw_inode->i_zone[i];
 452         minix_set_inode(inode, old_decode_dev(raw_inode->i_zone[0]));
 453         brelse(bh);
 454         unlock_new_inode(inode);
 455         return inode;
 456 }
 457
 458 /*
 459  * The minix V2 function to read an inode.
 460  */
 461 static struct inode *V2_minix_iget(struct inode *inode)
 462 {
 463         struct buffer_head * bh;
 464         struct minix2_inode * raw_inode;
 465         struct minix_inode_info *minix_inode = minix_i(inode);
 466         int i;
 467
 468         raw_inode = minix_V2_raw_inode(inode->i_sb, inode->i_ino, &bh);
 469         if (!raw_inode) {
 470                 iget_failed(inode);
 471                 return ERR_PTR(-EIO);
 472         }
 473         inode->i_mode = raw_inode->i_mode;
 474         inode->i_uid = (uid_t)raw_inode->i_uid;
 475         inode->i_gid = (gid_t)raw_inode->i_gid;
 476         inode->i_nlink = raw_inode->i_nlinks;
 477         inode->i_size = raw_inode->i_size;
 478         inode->i_mtime.tv_sec = raw_inode->i_mtime;
 479         inode->i_atime.tv_sec = raw_inode->i_atime;
 480         inode->i_ctime.tv_sec = raw_inode->i_ctime;
 481         inode->i_mtime.tv_nsec = 0;
 482         inode->i_atime.tv_nsec = 0;
 483         inode->i_ctime.tv_nsec = 0;
 484         inode->i_blocks = 0;
 485         for (i = 0; i < 10; i++)
 486                 minix_inode->u.i2_data[i] = raw_inode->i_zone[i];
 487         minix_set_inode(inode, old_decode_dev(raw_inode->i_zone[0]));
 488         brelse(bh);
 489         unlock_new_inode(inode);
 490         return inode;
 491 }
 492
 493 /*
 494  * The global function to read an inode.
 495  */
 496 struct inode *minix_iget(struct super_block *sb, unsigned long ino)
 497 {
 498         struct inode *inode;
 499
 500         inode = iget_locked(sb, ino);
 501         if (!inode)
 502                 return ERR_PTR(-ENOMEM);
 503         if (!(inode->i_state & I_NEW))
 504                 return inode;
 505
 506         if (INODE_VERSION(inode) == MINIX_V1)
 507                 return V1_minix_iget(inode);
 508         else
 509                 return V2_minix_iget(inode);
 510 }
 511
 512 /*
 513  * The minix V1 function to synchronize an inode.
 514  */
 515 static struct buffer_head * V1_minix_update_inode(struct inode * inode)
 516 {
 517         struct buffer_head * bh;
 518         struct minix_inode * raw_inode;
 519         struct minix_inode_info *minix_inode = minix_i(inode);
 520         int i;
 521
 522         raw_inode = minix_V1_raw_inode(inode->i_sb, inode->i_ino, &bh);
 523         if (!raw_inode)
 524                 return NULL;
 525         raw_inode->i_mode = inode->i_mode;
 526         raw_inode->i_uid = fs_high2lowuid(inode->i_uid);
 527         raw_inode->i_gid = fs_high2lowgid(inode->i_gid);
 528         raw_inode->i_nlinks = inode->i_nlink;
 529         raw_inode->i_size = inode->i_size;
 530         raw_inode->i_time = inode->i_mtime.tv_sec;
 531         if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
 532                 raw_inode->i_zone[0] = old_encode_dev(inode->i_rdev);
 533         else for (i = 0; i < 9; i++)
 534                 raw_inode->i_zone[i] = minix_inode->u.i1_data[i];
 535         mark_buffer_dirty(bh);
 536         return bh;
 537 }
 538
 539 /*
 540  * The minix V2 function to synchronize an inode.
 541  */
 542 static struct buffer_head * V2_minix_update_inode(struct inode * inode)
 543 {
 544         struct buffer_head * bh;
 545         struct minix2_inode * raw_inode;
 546         struct minix_inode_info *minix_inode = minix_i(inode);
 547         int i;
 548
 549         raw_inode = minix_V2_raw_inode(inode->i_sb, inode->i_ino, &bh);
 550         if (!raw_inode)
 551                 return NULL;
 552         raw_inode->i_mode = inode->i_mode;
 553         raw_inode->i_uid = fs_high2lowuid(inode->i_uid);
 554         raw_inode->i_gid = fs_high2lowgid(inode->i_gid);
 555         raw_inode->i_nlinks = inode->i_nlink;
 556         raw_inode->i_size = inode->i_size;
 557         raw_inode->i_mtime = inode->i_mtime.tv_sec;
 558         raw_inode->i_atime = inode->i_atime.tv_sec;
 559         raw_inode->i_ctime = inode->i_ctime.tv_sec;
 560         if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
 561                 raw_inode->i_zone[0] = old_encode_dev(inode->i_rdev);
 562         else for (i = 0; i < 10; i++)
 563                 raw_inode->i_zone[i] = minix_inode->u.i2_data[i];
 564         mark_buffer_dirty(bh);
 565         return bh;
 566 }
 567
 568 static int minix_write_inode(struct inode *inode, struct writeback_control *wbc)
 569 {
 570         int err = 0;
 571         struct buffer_head *bh;
 572
 573         if (INODE_VERSION(inode) == MINIX_V1)
 574                 bh = V1_minix_update_inode(inode);
 575         else
 576                 bh = V2_minix_update_inode(inode);
 577         if (!bh)
 578                 return -EIO;
 579         if (wbc->sync_mode == WB_SYNC_ALL && buffer_dirty(bh)) {
 580                 sync_dirty_buffer(bh);
 581                 if (buffer_req(bh) && !buffer_uptodate(bh)) {
 582                         printk("IO error syncing minix inode [%s:%08lx]\n",
 583                                 inode->i_sb->s_id, inode->i_ino);
 584                         err = -EIO;
 585                 }
 586         }
 587         brelse (bh);
 588         return err;
 589 }
 590
 591 int minix_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
 592 {
 593         struct inode *dir = dentry->d_parent->d_inode;
 594         struct super_block *sb = dir->i_sb;
 595         generic_fillattr(dentry->d_inode, stat);
 596         if (INODE_VERSION(dentry->d_inode) == MINIX_V1)
 597                 stat->blocks = (BLOCK_SIZE / 512) * V1_minix_blocks(stat->size, sb);
 598         else
 599                 stat->blocks = (sb->s_blocksize / 512) * V2_minix_blocks(stat->size, sb);
 600         stat->blksize = sb->s_blocksize;
 601         return 0;
 602 }
 603
 604 /*
 605  * The function that is called for file truncation.
 606  */
 607 void minix_truncate(struct inode * inode)
 608 {
 609         if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode)))
 610                 return;
 611         if (INODE_VERSION(inode) == MINIX_V1)
 612                 V1_minix_truncate(inode);
 613         else
 614                 V2_minix_truncate(inode);
 615 }
 616
 617 static int minix_get_sb(struct file_system_type *fs_type,
 618         int flags, const char *dev_name, void *data, struct vfsmount *mnt)
 619 {
 620         return get_sb_bdev(fs_type, flags, dev_name, data, minix_fill_super,
 621                            mnt);
 622 }
 623
 624 static struct file_system_type minix_fs_type = {
 625         .owner          = THIS_MODULE,
 626         .name           = "minix",
 627         .get_sb         = minix_get_sb,
 628         .kill_sb        = kill_block_super,
 629         .fs_flags       = FS_REQUIRES_DEV,
 630 };
 631
 632 static int __init init_minix_fs(void)
 633 {
 634         int err = init_inodecache();
 635         if (err)
 636                 goto out1;
 637         err = register_filesystem(&minix_fs_type);
 638         if (err)
 639                 goto out;
 640         return 0;
 641 out:
 642         destroy_inodecache();
 643 out1:
 644         return err;
 645 }
 646
 647 static void __exit exit_minix_fs(void)
 648 {
 649         unregister_filesystem(&minix_fs_type);
 650         destroy_inodecache();
 651 }
 652
 653 module_init(init_minix_fs)
 654 module_exit(exit_minix_fs)
 655 MODULE_LICENSE("GPL");