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