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_final(&inode->i_data);
  30         if (!inode->i_nlink) {
  31                 inode->i_size = 0;
  32                 minix_truncate(inode);
  33         }
  34         invalidate_inode_buffers(inode);
  35         clear_inode(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 = 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_i_callback(struct rcu_head *head)
  72 {
  73         struct inode *inode = container_of(head, struct inode, i_rcu);
  74         kmem_cache_free(minix_inode_cachep, minix_i(inode));
  75 }
  76
  77 static void minix_destroy_inode(struct inode *inode)
  78 {
  79         call_rcu(&inode->i_rcu, minix_i_callback);
  80 }
  81
  82 static void init_once(void *foo)
  83 {
  84         struct minix_inode_info *ei = (struct minix_inode_info *) foo;
  85
  86         inode_init_once(&ei->vfs_inode);
  87 }
  88
  89 static int __init init_inodecache(void)
  90 {
  91         minix_inode_cachep = kmem_cache_create("minix_inode_cache",
  92                                              sizeof(struct minix_inode_info),
  93                                              0, (SLAB_RECLAIM_ACCOUNT|
  94                                                 SLAB_MEM_SPREAD|SLAB_ACCOUNT),
  95                                              init_once);
  96         if (minix_inode_cachep == NULL)
  97                 return -ENOMEM;
  98         return 0;
  99 }
 100
 101 static void destroy_inodecache(void)
 102 {
 103         /*
 104          * Make sure all delayed rcu free inodes are flushed before we
 105          * destroy cache.
 106          */
 107         rcu_barrier();
 108         kmem_cache_destroy(minix_inode_cachep);
 109 }
 110
 111 static const struct super_operations minix_sops = {
 112         .alloc_inode    = minix_alloc_inode,
 113         .destroy_inode  = minix_destroy_inode,
 114         .write_inode    = minix_write_inode,
 115         .evict_inode    = minix_evict_inode,
 116         .put_super      = minix_put_super,
 117         .statfs         = minix_statfs,
 118         .remount_fs     = minix_remount,
 119 };
 120
 121 static int minix_remount (struct super_block * sb, int * flags, char * data)
 122 {
 123         struct minix_sb_info * sbi = minix_sb(sb);
 124         struct minix_super_block * ms;
 125
 126         sync_filesystem(sb);
 127         ms = sbi->s_ms;
 128         if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
 129                 return 0;
 130         if (*flags & MS_RDONLY) {
 131                 if (ms->s_state & MINIX_VALID_FS ||
 132                     !(sbi->s_mount_state & MINIX_VALID_FS))
 133                         return 0;
 134                 /* Mounting a rw partition read-only. */
 135                 if (sbi->s_version != MINIX_V3)
 136                         ms->s_state = sbi->s_mount_state;
 137                 mark_buffer_dirty(sbi->s_sbh);
 138         } else {
 139                 /* Mount a partition which is read-only, read-write. */
 140                 if (sbi->s_version != MINIX_V3) {
 141                         sbi->s_mount_state = ms->s_state;
 142                         ms->s_state &= ~MINIX_VALID_FS;
 143                 } else {
 144                         sbi->s_mount_state = MINIX_VALID_FS;
 145                 }
 146                 mark_buffer_dirty(sbi->s_sbh);
 147
 148                 if (!(sbi->s_mount_state & MINIX_VALID_FS))
 149                         printk("MINIX-fs warning: remounting unchecked fs, "
 150                                 "running fsck is recommended\n");
 151                 else if ((sbi->s_mount_state & MINIX_ERROR_FS))
 152                         printk("MINIX-fs warning: remounting fs with errors, "
 153                                 "running fsck is recommended\n");
 154         }
 155         return 0;
 156 }
 157
 158 static int minix_fill_super(struct super_block *s, void *data, int silent)
 159 {
 160         struct buffer_head *bh;
 161         struct buffer_head **map;
 162         struct minix_super_block *ms;
 163         struct minix3_super_block *m3s = NULL;
 164         unsigned long i, block;
 165         struct inode *root_inode;
 166         struct minix_sb_info *sbi;
 167         int ret = -EINVAL;
 168
 169         sbi = kzalloc(sizeof(struct minix_sb_info), GFP_KERNEL);
 170         if (!sbi)
 171                 return -ENOMEM;
 172         s->s_fs_info = sbi;
 173
 174         BUILD_BUG_ON(32 != sizeof (struct minix_inode));
 175         BUILD_BUG_ON(64 != sizeof(struct minix2_inode));
 176
 177         if (!sb_set_blocksize(s, BLOCK_SIZE))
 178                 goto out_bad_hblock;
 179
 180         if (!(bh = sb_bread(s, 1)))
 181                 goto out_bad_sb;
 182
 183         ms = (struct minix_super_block *) bh->b_data;
 184         sbi->s_ms = ms;
 185         sbi->s_sbh = bh;
 186         sbi->s_mount_state = ms->s_state;
 187         sbi->s_ninodes = ms->s_ninodes;
 188         sbi->s_nzones = ms->s_nzones;
 189         sbi->s_imap_blocks = ms->s_imap_blocks;
 190         sbi->s_zmap_blocks = ms->s_zmap_blocks;
 191         sbi->s_firstdatazone = ms->s_firstdatazone;
 192         sbi->s_log_zone_size = ms->s_log_zone_size;
 193         sbi->s_max_size = ms->s_max_size;
 194         s->s_magic = ms->s_magic;
 195         if (s->s_magic == MINIX_SUPER_MAGIC) {
 196                 sbi->s_version = MINIX_V1;
 197                 sbi->s_dirsize = 16;
 198                 sbi->s_namelen = 14;
 199                 s->s_max_links = MINIX_LINK_MAX;
 200         } else if (s->s_magic == MINIX_SUPER_MAGIC2) {
 201                 sbi->s_version = MINIX_V1;
 202                 sbi->s_dirsize = 32;
 203                 sbi->s_namelen = 30;
 204                 s->s_max_links = MINIX_LINK_MAX;
 205         } else if (s->s_magic == MINIX2_SUPER_MAGIC) {
 206                 sbi->s_version = MINIX_V2;
 207                 sbi->s_nzones = ms->s_zones;
 208                 sbi->s_dirsize = 16;
 209                 sbi->s_namelen = 14;
 210                 s->s_max_links = MINIX2_LINK_MAX;
 211         } else if (s->s_magic == MINIX2_SUPER_MAGIC2) {
 212                 sbi->s_version = MINIX_V2;
 213                 sbi->s_nzones = ms->s_zones;
 214                 sbi->s_dirsize = 32;
 215                 sbi->s_namelen = 30;
 216                 s->s_max_links = MINIX2_LINK_MAX;
 217         } else if ( *(__u16 *)(bh->b_data + 24) == MINIX3_SUPER_MAGIC) {
 218                 m3s = (struct minix3_super_block *) bh->b_data;
 219                 s->s_magic = m3s->s_magic;
 220                 sbi->s_imap_blocks = m3s->s_imap_blocks;
 221                 sbi->s_zmap_blocks = m3s->s_zmap_blocks;
 222                 sbi->s_firstdatazone = m3s->s_firstdatazone;
 223                 sbi->s_log_zone_size = m3s->s_log_zone_size;
 224                 sbi->s_max_size = m3s->s_max_size;
 225                 sbi->s_ninodes = m3s->s_ninodes;
 226                 sbi->s_nzones = m3s->s_zones;
 227                 sbi->s_dirsize = 64;
 228                 sbi->s_namelen = 60;
 229                 sbi->s_version = MINIX_V3;
 230                 sbi->s_mount_state = MINIX_VALID_FS;
 231                 sb_set_blocksize(s, m3s->s_blocksize);
 232                 s->s_max_links = MINIX2_LINK_MAX;
 233         } else
 234                 goto out_no_fs;
 235
 236         /*
 237          * Allocate the buffer map to keep the superblock small.
 238          */
 239         if (sbi->s_imap_blocks == 0 || sbi->s_zmap_blocks == 0)
 240                 goto out_illegal_sb;
 241         i = (sbi->s_imap_blocks + sbi->s_zmap_blocks) * sizeof(bh);
 242         map = kzalloc(i, GFP_KERNEL);
 243         if (!map)
 244                 goto out_no_map;
 245         sbi->s_imap = &map[0];
 246         sbi->s_zmap = &map[sbi->s_imap_blocks];
 247
 248         block=2;
 249         for (i=0 ; i < sbi->s_imap_blocks ; i++) {
 250                 if (!(sbi->s_imap[i]=sb_bread(s, block)))
 251                         goto out_no_bitmap;
 252                 block++;
 253         }
 254         for (i=0 ; i < sbi->s_zmap_blocks ; i++) {
 255                 if (!(sbi->s_zmap[i]=sb_bread(s, block)))
 256                         goto out_no_bitmap;
 257                 block++;
 258         }
 259
 260         minix_set_bit(0,sbi->s_imap[0]->b_data);
 261         minix_set_bit(0,sbi->s_zmap[0]->b_data);
 262
 263         /* Apparently minix can create filesystems that allocate more blocks for
 264          * the bitmaps than needed.  We simply ignore that, but verify it didn't
 265          * create one with not enough blocks and bail out if so.
 266          */
 267         block = minix_blocks_needed(sbi->s_ninodes, s->s_blocksize);
 268         if (sbi->s_imap_blocks < block) {
 269                 printk("MINIX-fs: file system does not have enough "
 270                                 "imap blocks allocated.  Refusing to mount.\n");
 271                 goto out_no_bitmap;
 272         }
 273
 274         block = minix_blocks_needed(
 275                         (sbi->s_nzones - sbi->s_firstdatazone + 1),
 276                         s->s_blocksize);
 277         if (sbi->s_zmap_blocks < block) {
 278                 printk("MINIX-fs: file system does not have enough "
 279                                 "zmap blocks allocated.  Refusing to mount.\n");
 280                 goto out_no_bitmap;
 281         }
 282
 283         /* set up enough so that it can read an inode */
 284         s->s_op = &minix_sops;
 285         root_inode = minix_iget(s, MINIX_ROOT_INO);
 286         if (IS_ERR(root_inode)) {
 287                 ret = PTR_ERR(root_inode);
 288                 goto out_no_root;
 289         }
 290
 291         ret = -ENOMEM;
 292         s->s_root = d_make_root(root_inode);
 293         if (!s->s_root)
 294                 goto out_no_root;
 295
 296         if (!(s->s_flags & MS_RDONLY)) {
 297                 if (sbi->s_version != MINIX_V3) /* s_state is now out from V3 sb */
 298                         ms->s_state &= ~MINIX_VALID_FS;
 299                 mark_buffer_dirty(bh);
 300         }
 301         if (!(sbi->s_mount_state & MINIX_VALID_FS))
 302                 printk("MINIX-fs: mounting unchecked file system, "
 303                         "running fsck is recommended\n");
 304         else if (sbi->s_mount_state & MINIX_ERROR_FS)
 305                 printk("MINIX-fs: mounting file system with errors, "
 306                         "running fsck is recommended\n");
 307
 308         return 0;
 309
 310 out_no_root:
 311         if (!silent)
 312                 printk("MINIX-fs: get root inode failed\n");
 313         goto out_freemap;
 314
 315 out_no_bitmap:
 316         printk("MINIX-fs: bad superblock or unable to read bitmaps\n");
 317 out_freemap:
 318         for (i = 0; i < sbi->s_imap_blocks; i++)
 319                 brelse(sbi->s_imap[i]);
 320         for (i = 0; i < sbi->s_zmap_blocks; i++)
 321                 brelse(sbi->s_zmap[i]);
 322         kfree(sbi->s_imap);
 323         goto out_release;
 324
 325 out_no_map:
 326         ret = -ENOMEM;
 327         if (!silent)
 328                 printk("MINIX-fs: can't allocate map\n");
 329         goto out_release;
 330
 331 out_illegal_sb:
 332         if (!silent)
 333                 printk("MINIX-fs: bad superblock\n");
 334         goto out_release;
 335
 336 out_no_fs:
 337         if (!silent)
 338                 printk("VFS: Can't find a Minix filesystem V1 | V2 | V3 "
 339                        "on device %s.\n", s->s_id);
 340 out_release:
 341         brelse(bh);
 342         goto out;
 343
 344 out_bad_hblock:
 345         printk("MINIX-fs: blocksize too small for device\n");
 346         goto out;
 347
 348 out_bad_sb:
 349         printk("MINIX-fs: unable to read superblock\n");
 350 out:
 351         s->s_fs_info = NULL;
 352         kfree(sbi);
 353         return ret;
 354 }
 355
 356 static int minix_statfs(struct dentry *dentry, struct kstatfs *buf)
 357 {
 358         struct super_block *sb = dentry->d_sb;
 359         struct minix_sb_info *sbi = minix_sb(sb);
 360         u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
 361         buf->f_type = sb->s_magic;
 362         buf->f_bsize = sb->s_blocksize;
 363         buf->f_blocks = (sbi->s_nzones - sbi->s_firstdatazone) << sbi->s_log_zone_size;
 364         buf->f_bfree = minix_count_free_blocks(sb);
 365         buf->f_bavail = buf->f_bfree;
 366         buf->f_files = sbi->s_ninodes;
 367         buf->f_ffree = minix_count_free_inodes(sb);
 368         buf->f_namelen = sbi->s_namelen;
 369         buf->f_fsid.val[0] = (u32)id;
 370         buf->f_fsid.val[1] = (u32)(id >> 32);
 371
 372         return 0;
 373 }
 374
 375 static int minix_get_block(struct inode *inode, sector_t block,
 376                     struct buffer_head *bh_result, int create)
 377 {
 378         if (INODE_VERSION(inode) == MINIX_V1)
 379                 return V1_minix_get_block(inode, block, bh_result, create);
 380         else
 381                 return V2_minix_get_block(inode, block, bh_result, create);
 382 }
 383
 384 static int minix_writepage(struct page *page, struct writeback_control *wbc)
 385 {
 386         return block_write_full_page(page, minix_get_block, wbc);
 387 }
 388
 389 static int minix_readpage(struct file *file, struct page *page)
 390 {
 391         return block_read_full_page(page,minix_get_block);
 392 }
 393
 394 int minix_prepare_chunk(struct page *page, loff_t pos, unsigned len)
 395 {
 396         return __block_write_begin(page, pos, len, minix_get_block);
 397 }
 398
 399 static void minix_write_failed(struct address_space *mapping, loff_t to)
 400 {
 401         struct inode *inode = mapping->host;
 402
 403         if (to > inode->i_size) {
 404                 truncate_pagecache(inode, inode->i_size);
 405                 minix_truncate(inode);
 406         }
 407 }
 408
 409 static int minix_write_begin(struct file *file, struct address_space *mapping,
 410                         loff_t pos, unsigned len, unsigned flags,
 411                         struct page **pagep, void **fsdata)
 412 {
 413         int ret;
 414
 415         ret = block_write_begin(mapping, pos, len, flags, pagep,
 416                                 minix_get_block);
 417         if (unlikely(ret))
 418                 minix_write_failed(mapping, pos + len);
 419
 420         return ret;
 421 }
 422
 423 static sector_t minix_bmap(struct address_space *mapping, sector_t block)
 424 {
 425         return generic_block_bmap(mapping,block,minix_get_block);
 426 }
 427
 428 static const struct address_space_operations minix_aops = {
 429         .readpage = minix_readpage,
 430         .writepage = minix_writepage,
 431         .write_begin = minix_write_begin,
 432         .write_end = generic_write_end,
 433         .bmap = minix_bmap
 434 };
 435
 436 static const struct inode_operations minix_symlink_inode_operations = {
 437         .readlink       = generic_readlink,
 438         .get_link       = page_get_link,
 439         .getattr        = minix_getattr,
 440 };
 441
 442 void minix_set_inode(struct inode *inode, dev_t rdev)
 443 {
 444         if (S_ISREG(inode->i_mode)) {
 445                 inode->i_op = &minix_file_inode_operations;
 446                 inode->i_fop = &minix_file_operations;
 447                 inode->i_mapping->a_ops = &minix_aops;
 448         } else if (S_ISDIR(inode->i_mode)) {
 449                 inode->i_op = &minix_dir_inode_operations;
 450                 inode->i_fop = &minix_dir_operations;
 451                 inode->i_mapping->a_ops = &minix_aops;
 452         } else if (S_ISLNK(inode->i_mode)) {
 453                 inode->i_op = &minix_symlink_inode_operations;
 454                 inode_nohighmem(inode);
 455                 inode->i_mapping->a_ops = &minix_aops;
 456         } else
 457                 init_special_inode(inode, inode->i_mode, rdev);
 458 }
 459
 460 /*
 461  * The minix V1 function to read an inode.
 462  */
 463 static struct inode *V1_minix_iget(struct inode *inode)
 464 {
 465         struct buffer_head * bh;
 466         struct minix_inode * raw_inode;
 467         struct minix_inode_info *minix_inode = minix_i(inode);
 468         int i;
 469
 470         raw_inode = minix_V1_raw_inode(inode->i_sb, inode->i_ino, &bh);
 471         if (!raw_inode) {
 472                 iget_failed(inode);
 473                 return ERR_PTR(-EIO);
 474         }
 475         inode->i_mode = raw_inode->i_mode;
 476         i_uid_write(inode, raw_inode->i_uid);
 477         i_gid_write(inode, raw_inode->i_gid);
 478         set_nlink(inode, raw_inode->i_nlinks);
 479         inode->i_size = raw_inode->i_size;
 480         inode->i_mtime.tv_sec = inode->i_atime.tv_sec = inode->i_ctime.tv_sec = raw_inode->i_time;
 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 < 9; i++)
 486                 minix_inode->u.i1_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 minix V2 function to read an inode.
 495  */
 496 static struct inode *V2_minix_iget(struct inode *inode)
 497 {
 498         struct buffer_head * bh;
 499         struct minix2_inode * raw_inode;
 500         struct minix_inode_info *minix_inode = minix_i(inode);
 501         int i;
 502
 503         raw_inode = minix_V2_raw_inode(inode->i_sb, inode->i_ino, &bh);
 504         if (!raw_inode) {
 505                 iget_failed(inode);
 506                 return ERR_PTR(-EIO);
 507         }
 508         inode->i_mode = raw_inode->i_mode;
 509         i_uid_write(inode, raw_inode->i_uid);
 510         i_gid_write(inode, raw_inode->i_gid);
 511         set_nlink(inode, raw_inode->i_nlinks);
 512         inode->i_size = raw_inode->i_size;
 513         inode->i_mtime.tv_sec = raw_inode->i_mtime;
 514         inode->i_atime.tv_sec = raw_inode->i_atime;
 515         inode->i_ctime.tv_sec = raw_inode->i_ctime;
 516         inode->i_mtime.tv_nsec = 0;
 517         inode->i_atime.tv_nsec = 0;
 518         inode->i_ctime.tv_nsec = 0;
 519         inode->i_blocks = 0;
 520         for (i = 0; i < 10; i++)
 521                 minix_inode->u.i2_data[i] = raw_inode->i_zone[i];
 522         minix_set_inode(inode, old_decode_dev(raw_inode->i_zone[0]));
 523         brelse(bh);
 524         unlock_new_inode(inode);
 525         return inode;
 526 }
 527
 528 /*
 529  * The global function to read an inode.
 530  */
 531 struct inode *minix_iget(struct super_block *sb, unsigned long ino)
 532 {
 533         struct inode *inode;
 534
 535         inode = iget_locked(sb, ino);
 536         if (!inode)
 537                 return ERR_PTR(-ENOMEM);
 538         if (!(inode->i_state & I_NEW))
 539                 return inode;
 540
 541         if (INODE_VERSION(inode) == MINIX_V1)
 542                 return V1_minix_iget(inode);
 543         else
 544                 return V2_minix_iget(inode);
 545 }
 546
 547 /*
 548  * The minix V1 function to synchronize an inode.
 549  */
 550 static struct buffer_head * V1_minix_update_inode(struct inode * inode)
 551 {
 552         struct buffer_head * bh;
 553         struct minix_inode * raw_inode;
 554         struct minix_inode_info *minix_inode = minix_i(inode);
 555         int i;
 556
 557         raw_inode = minix_V1_raw_inode(inode->i_sb, inode->i_ino, &bh);
 558         if (!raw_inode)
 559                 return NULL;
 560         raw_inode->i_mode = inode->i_mode;
 561         raw_inode->i_uid = fs_high2lowuid(i_uid_read(inode));
 562         raw_inode->i_gid = fs_high2lowgid(i_gid_read(inode));
 563         raw_inode->i_nlinks = inode->i_nlink;
 564         raw_inode->i_size = inode->i_size;
 565         raw_inode->i_time = inode->i_mtime.tv_sec;
 566         if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
 567                 raw_inode->i_zone[0] = old_encode_dev(inode->i_rdev);
 568         else for (i = 0; i < 9; i++)
 569                 raw_inode->i_zone[i] = minix_inode->u.i1_data[i];
 570         mark_buffer_dirty(bh);
 571         return bh;
 572 }
 573
 574 /*
 575  * The minix V2 function to synchronize an inode.
 576  */
 577 static struct buffer_head * V2_minix_update_inode(struct inode * inode)
 578 {
 579         struct buffer_head * bh;
 580         struct minix2_inode * raw_inode;
 581         struct minix_inode_info *minix_inode = minix_i(inode);
 582         int i;
 583
 584         raw_inode = minix_V2_raw_inode(inode->i_sb, inode->i_ino, &bh);
 585         if (!raw_inode)
 586                 return NULL;
 587         raw_inode->i_mode = inode->i_mode;
 588         raw_inode->i_uid = fs_high2lowuid(i_uid_read(inode));
 589         raw_inode->i_gid = fs_high2lowgid(i_gid_read(inode));
 590         raw_inode->i_nlinks = inode->i_nlink;
 591         raw_inode->i_size = inode->i_size;
 592         raw_inode->i_mtime = inode->i_mtime.tv_sec;
 593         raw_inode->i_atime = inode->i_atime.tv_sec;
 594         raw_inode->i_ctime = inode->i_ctime.tv_sec;
 595         if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
 596                 raw_inode->i_zone[0] = old_encode_dev(inode->i_rdev);
 597         else for (i = 0; i < 10; i++)
 598                 raw_inode->i_zone[i] = minix_inode->u.i2_data[i];
 599         mark_buffer_dirty(bh);
 600         return bh;
 601 }
 602
 603 static int minix_write_inode(struct inode *inode, struct writeback_control *wbc)
 604 {
 605         int err = 0;
 606         struct buffer_head *bh;
 607
 608         if (INODE_VERSION(inode) == MINIX_V1)
 609                 bh = V1_minix_update_inode(inode);
 610         else
 611                 bh = V2_minix_update_inode(inode);
 612         if (!bh)
 613                 return -EIO;
 614         if (wbc->sync_mode == WB_SYNC_ALL && buffer_dirty(bh)) {
 615                 sync_dirty_buffer(bh);
 616                 if (buffer_req(bh) && !buffer_uptodate(bh)) {
 617                         printk("IO error syncing minix inode [%s:%08lx]\n",
 618                                 inode->i_sb->s_id, inode->i_ino);
 619                         err = -EIO;
 620                 }
 621         }
 622         brelse (bh);
 623         return err;
 624 }
 625
 626 int minix_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
 627 {
 628         struct super_block *sb = dentry->d_sb;
 629         generic_fillattr(d_inode(dentry), stat);
 630         if (INODE_VERSION(d_inode(dentry)) == MINIX_V1)
 631                 stat->blocks = (BLOCK_SIZE / 512) * V1_minix_blocks(stat->size, sb);
 632         else
 633                 stat->blocks = (sb->s_blocksize / 512) * V2_minix_blocks(stat->size, sb);
 634         stat->blksize = sb->s_blocksize;
 635         return 0;
 636 }
 637
 638 /*
 639  * The function that is called for file truncation.
 640  */
 641 void minix_truncate(struct inode * inode)
 642 {
 643         if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode)))
 644                 return;
 645         if (INODE_VERSION(inode) == MINIX_V1)
 646                 V1_minix_truncate(inode);
 647         else
 648                 V2_minix_truncate(inode);
 649 }
 650
 651 static struct dentry *minix_mount(struct file_system_type *fs_type,
 652         int flags, const char *dev_name, void *data)
 653 {
 654         return mount_bdev(fs_type, flags, dev_name, data, minix_fill_super);
 655 }
 656
 657 static struct file_system_type minix_fs_type = {
 658         .owner          = THIS_MODULE,
 659         .name           = "minix",
 660         .mount          = minix_mount,
 661         .kill_sb        = kill_block_super,
 662         .fs_flags       = FS_REQUIRES_DEV,
 663 };
 664 MODULE_ALIAS_FS("minix");
 665
 666 static int __init init_minix_fs(void)
 667 {
 668         int err = init_inodecache();
 669         if (err)
 670                 goto out1;
 671         err = register_filesystem(&minix_fs_type);
 672         if (err)
 673                 goto out;
 674         return 0;
 675 out:
 676         destroy_inodecache();
 677 out1:
 678         return err;
 679 }
 680
 681 static void __exit exit_minix_fs(void)
 682 {
 683         unregister_filesystem(&minix_fs_type);
 684         destroy_inodecache();
 685 }
 686
 687 module_init(init_minix_fs)
 688 module_exit(exit_minix_fs)
 689 MODULE_LICENSE("GPL");
 690