minix/inode.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  *  linux/fs/minix/inode.c
   4  *
   5  *  Copyright (C) 1991, 1992  Linus Torvalds
   6  *
   7  *  Copyright (C) 1996  Gertjan van Wingerde
   8  *      Minix V2 fs support.
   9  *
  10  *  Modified for 680x0 by Andreas Schwab
  11  *  Updated to filesystem version 3 by Daniel Aragones
  12  */
  13
  14 #include <linux/module.h>
  15 #include "minix.h"
  16 #include <linux/buffer_head.h>
  17 #include <linux/slab.h>
  18 #include <linux/init.h>
  19 #include <linux/highuid.h>
  20 #include <linux/vfs.h>
  21 #include <linux/writeback.h>
  22
  23 static int minix_write_inode(struct inode *inode,
  24                 struct writeback_control *wbc);
  25 static int minix_statfs(struct dentry *dentry, struct kstatfs *buf);
  26 static int minix_remount (struct super_block * sb, int * flags, char * data);
  27
  28 static void minix_evict_inode(struct inode *inode)
  29 {
  30         truncate_inode_pages_final(&inode->i_data);
  31         if (!inode->i_nlink) {
  32                 inode->i_size = 0;
  33                 minix_truncate(inode);
  34         }
  35         invalidate_inode_buffers(inode);
  36         clear_inode(inode);
  37         if (!inode->i_nlink)
  38                 minix_free_inode(inode);
  39 }
  40
  41 static void minix_put_super(struct super_block *sb)
  42 {
  43         int i;
  44         struct minix_sb_info *sbi = minix_sb(sb);
  45
  46         if (!sb_rdonly(sb)) {
  47                 if (sbi->s_version != MINIX_V3)  /* s_state is now out from V3 sb */
  48                         sbi->s_ms->s_state = sbi->s_mount_state;
  49                 mark_buffer_dirty(sbi->s_sbh);
  50         }
  51         for (i = 0; i < sbi->s_imap_blocks; i++)
  52                 brelse(sbi->s_imap[i]);
  53         for (i = 0; i < sbi->s_zmap_blocks; i++)
  54                 brelse(sbi->s_zmap[i]);
  55         brelse (sbi->s_sbh);
  56         kfree(sbi->s_imap);
  57         sb->s_fs_info = NULL;
  58         kfree(sbi);
  59 }
  60
  61 static struct kmem_cache * minix_inode_cachep;
  62
  63 static struct inode *minix_alloc_inode(struct super_block *sb)
  64 {
  65         struct minix_inode_info *ei;
  66         ei = kmem_cache_alloc(minix_inode_cachep, GFP_KERNEL);
  67         if (!ei)
  68                 return NULL;
  69         return &ei->vfs_inode;
  70 }
  71
  72 static void minix_free_in_core_inode(struct inode *inode)
  73 {
  74         kmem_cache_free(minix_inode_cachep, minix_i(inode));
  75 }
  76
  77 static void init_once(void *foo)
  78 {
  79         struct minix_inode_info *ei = (struct minix_inode_info *) foo;
  80
  81         inode_init_once(&ei->vfs_inode);
  82 }
  83
  84 static int __init init_inodecache(void)
  85 {
  86         minix_inode_cachep = kmem_cache_create("minix_inode_cache",
  87                                              sizeof(struct minix_inode_info),
  88                                              0, (SLAB_RECLAIM_ACCOUNT|
  89                                                 SLAB_MEM_SPREAD|SLAB_ACCOUNT),
  90                                              init_once);
  91         if (minix_inode_cachep == NULL)
  92                 return -ENOMEM;
  93         return 0;
  94 }
  95
  96 static void destroy_inodecache(void)
  97 {
  98         /*
  99          * Make sure all delayed rcu free inodes are flushed before we
 100          * destroy cache.
 101          */
 102         rcu_barrier();
 103         kmem_cache_destroy(minix_inode_cachep);
 104 }
 105
 106 static const struct super_operations minix_sops = {
 107         .alloc_inode    = minix_alloc_inode,
 108         .free_inode     = minix_free_in_core_inode,
 109         .write_inode    = minix_write_inode,
 110         .evict_inode    = minix_evict_inode,
 111         .put_super      = minix_put_super,
 112         .statfs         = minix_statfs,
 113         .remount_fs     = minix_remount,
 114 };
 115
 116 static int minix_remount (struct super_block * sb, int * flags, char * data)
 117 {
 118         struct minix_sb_info * sbi = minix_sb(sb);
 119         struct minix_super_block * ms;
 120
 121         sync_filesystem(sb);
 122         ms = sbi->s_ms;
 123         if ((bool)(*flags & SB_RDONLY) == sb_rdonly(sb))
 124                 return 0;
 125         if (*flags & SB_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                 s->s_max_links = 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                 s->s_max_links = 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                 s->s_max_links = 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                 s->s_max_links = 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_mount_state = MINIX_VALID_FS;
 226                 sb_set_blocksize(s, m3s->s_blocksize);
 227                 s->s_max_links = MINIX2_LINK_MAX;
 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         /* Apparently minix can create filesystems that allocate more blocks for
 259          * the bitmaps than needed.  We simply ignore that, but verify it didn't
 260          * create one with not enough blocks and bail out if so.
 261          */
 262         block = minix_blocks_needed(sbi->s_ninodes, s->s_blocksize);
 263         if (sbi->s_imap_blocks < block) {
 264                 printk("MINIX-fs: file system does not have enough "
 265                                 "imap blocks allocated.  Refusing to mount.\n");
 266                 goto out_no_bitmap;
 267         }
 268
 269         block = minix_blocks_needed(
 270                         (sbi->s_nzones - sbi->s_firstdatazone + 1),
 271                         s->s_blocksize);
 272         if (sbi->s_zmap_blocks < block) {
 273                 printk("MINIX-fs: file system does not have enough "
 274                                 "zmap blocks allocated.  Refusing to mount.\n");
 275                 goto out_no_bitmap;
 276         }
 277
 278         /* set up enough so that it can read an inode */
 279         s->s_op = &minix_sops;
 280         root_inode = minix_iget(s, MINIX_ROOT_INO);
 281         if (IS_ERR(root_inode)) {
 282                 ret = PTR_ERR(root_inode);
 283                 goto out_no_root;
 284         }
 285
 286         ret = -ENOMEM;
 287         s->s_root = d_make_root(root_inode);
 288         if (!s->s_root)
 289                 goto out_no_root;
 290
 291         if (!sb_rdonly(s)) {
 292                 if (sbi->s_version != MINIX_V3) /* s_state is now out from V3 sb */
 293                         ms->s_state &= ~MINIX_VALID_FS;
 294                 mark_buffer_dirty(bh);
 295         }
 296         if (!(sbi->s_mount_state & MINIX_VALID_FS))
 297                 printk("MINIX-fs: mounting unchecked file system, "
 298                         "running fsck is recommended\n");
 299         else if (sbi->s_mount_state & MINIX_ERROR_FS)
 300                 printk("MINIX-fs: mounting file system with errors, "
 301                         "running fsck is recommended\n");
 302
 303         return 0;
 304
 305 out_no_root:
 306         if (!silent)
 307                 printk("MINIX-fs: get root inode failed\n");
 308         goto out_freemap;
 309
 310 out_no_bitmap:
 311         printk("MINIX-fs: bad superblock or unable to read bitmaps\n");
 312 out_freemap:
 313         for (i = 0; i < sbi->s_imap_blocks; i++)
 314                 brelse(sbi->s_imap[i]);
 315         for (i = 0; i < sbi->s_zmap_blocks; i++)
 316                 brelse(sbi->s_zmap[i]);
 317         kfree(sbi->s_imap);
 318         goto out_release;
 319
 320 out_no_map:
 321         ret = -ENOMEM;
 322         if (!silent)
 323                 printk("MINIX-fs: can't allocate map\n");
 324         goto out_release;
 325
 326 out_illegal_sb:
 327         if (!silent)
 328                 printk("MINIX-fs: bad superblock\n");
 329         goto out_release;
 330
 331 out_no_fs:
 332         if (!silent)
 333                 printk("VFS: Can't find a Minix filesystem V1 | V2 | V3 "
 334                        "on device %s.\n", s->s_id);
 335 out_release:
 336         brelse(bh);
 337         goto out;
 338
 339 out_bad_hblock:
 340         printk("MINIX-fs: blocksize too small for device\n");
 341         goto out;
 342
 343 out_bad_sb:
 344         printk("MINIX-fs: unable to read superblock\n");
 345 out:
 346         s->s_fs_info = NULL;
 347         kfree(sbi);
 348         return ret;
 349 }
 350
 351 static int minix_statfs(struct dentry *dentry, struct kstatfs *buf)
 352 {
 353         struct super_block *sb = dentry->d_sb;
 354         struct minix_sb_info *sbi = minix_sb(sb);
 355         u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
 356         buf->f_type = sb->s_magic;
 357         buf->f_bsize = sb->s_blocksize;
 358         buf->f_blocks = (sbi->s_nzones - sbi->s_firstdatazone) << sbi->s_log_zone_size;
 359         buf->f_bfree = minix_count_free_blocks(sb);
 360         buf->f_bavail = buf->f_bfree;
 361         buf->f_files = sbi->s_ninodes;
 362         buf->f_ffree = minix_count_free_inodes(sb);
 363         buf->f_namelen = sbi->s_namelen;
 364         buf->f_fsid.val[0] = (u32)id;
 365         buf->f_fsid.val[1] = (u32)(id >> 32);
 366
 367         return 0;
 368 }
 369
 370 static int minix_get_block(struct inode *inode, sector_t block,
 371                     struct buffer_head *bh_result, int create)
 372 {
 373         if (INODE_VERSION(inode) == MINIX_V1)
 374                 return V1_minix_get_block(inode, block, bh_result, create);
 375         else
 376                 return V2_minix_get_block(inode, block, bh_result, create);
 377 }
 378
 379 static int minix_writepage(struct page *page, struct writeback_control *wbc)
 380 {
 381         return block_write_full_page(page, minix_get_block, wbc);
 382 }
 383
 384 static int minix_readpage(struct file *file, struct page *page)
 385 {
 386         return block_read_full_page(page,minix_get_block);
 387 }
 388
 389 int minix_prepare_chunk(struct page *page, loff_t pos, unsigned len)
 390 {
 391         return __block_write_begin(page, pos, len, minix_get_block);
 392 }
 393
 394 static void minix_write_failed(struct address_space *mapping, loff_t to)
 395 {
 396         struct inode *inode = mapping->host;
 397
 398         if (to > inode->i_size) {
 399                 truncate_pagecache(inode, inode->i_size);
 400                 minix_truncate(inode);
 401         }
 402 }
 403
 404 static int minix_write_begin(struct file *file, struct address_space *mapping,
 405                         loff_t pos, unsigned len, unsigned flags,
 406                         struct page **pagep, void **fsdata)
 407 {
 408         int ret;
 409
 410         ret = block_write_begin(mapping, pos, len, flags, pagep,
 411                                 minix_get_block);
 412         if (unlikely(ret))
 413                 minix_write_failed(mapping, pos + len);
 414
 415         return ret;
 416 }
 417
 418 static sector_t minix_bmap(struct address_space *mapping, sector_t block)
 419 {
 420         return generic_block_bmap(mapping,block,minix_get_block);
 421 }
 422
 423 static const struct address_space_operations minix_aops = {
 424         .readpage = minix_readpage,
 425         .writepage = minix_writepage,
 426         .write_begin = minix_write_begin,
 427         .write_end = generic_write_end,
 428         .bmap = minix_bmap
 429 };
 430
 431 static const struct inode_operations minix_symlink_inode_operations = {
 432         .get_link       = page_get_link,
 433         .getattr        = minix_getattr,
 434 };
 435
 436 void minix_set_inode(struct inode *inode, dev_t rdev)
 437 {
 438         if (S_ISREG(inode->i_mode)) {
 439                 inode->i_op = &minix_file_inode_operations;
 440                 inode->i_fop = &minix_file_operations;
 441                 inode->i_mapping->a_ops = &minix_aops;
 442         } else if (S_ISDIR(inode->i_mode)) {
 443                 inode->i_op = &minix_dir_inode_operations;
 444                 inode->i_fop = &minix_dir_operations;
 445                 inode->i_mapping->a_ops = &minix_aops;
 446         } else if (S_ISLNK(inode->i_mode)) {
 447                 inode->i_op = &minix_symlink_inode_operations;
 448                 inode_nohighmem(inode);
 449                 inode->i_mapping->a_ops = &minix_aops;
 450         } else
 451                 init_special_inode(inode, inode->i_mode, rdev);
 452 }
 453
 454 /*
 455  * The minix V1 function to read an inode.
 456  */
 457 static struct inode *V1_minix_iget(struct inode *inode)
 458 {
 459         struct buffer_head * bh;
 460         struct minix_inode * raw_inode;
 461         struct minix_inode_info *minix_inode = minix_i(inode);
 462         int i;
 463
 464         raw_inode = minix_V1_raw_inode(inode->i_sb, inode->i_ino, &bh);
 465         if (!raw_inode) {
 466                 iget_failed(inode);
 467                 return ERR_PTR(-EIO);
 468         }
 469         inode->i_mode = raw_inode->i_mode;
 470         i_uid_write(inode, raw_inode->i_uid);
 471         i_gid_write(inode, raw_inode->i_gid);
 472         set_nlink(inode, raw_inode->i_nlinks);
 473         inode->i_size = raw_inode->i_size;
 474         inode->i_mtime.tv_sec = inode->i_atime.tv_sec = inode->i_ctime.tv_sec = raw_inode->i_time;
 475         inode->i_mtime.tv_nsec = 0;
 476         inode->i_atime.tv_nsec = 0;
 477         inode->i_ctime.tv_nsec = 0;
 478         inode->i_blocks = 0;
 479         for (i = 0; i < 9; i++)
 480                 minix_inode->u.i1_data[i] = raw_inode->i_zone[i];
 481         minix_set_inode(inode, old_decode_dev(raw_inode->i_zone[0]));
 482         brelse(bh);
 483         unlock_new_inode(inode);
 484         return inode;
 485 }
 486
 487 /*
 488  * The minix V2 function to read an inode.
 489  */
 490 static struct inode *V2_minix_iget(struct inode *inode)
 491 {
 492         struct buffer_head * bh;
 493         struct minix2_inode * raw_inode;
 494         struct minix_inode_info *minix_inode = minix_i(inode);
 495         int i;
 496
 497         raw_inode = minix_V2_raw_inode(inode->i_sb, inode->i_ino, &bh);
 498         if (!raw_inode) {
 499                 iget_failed(inode);
 500                 return ERR_PTR(-EIO);
 501         }
 502         inode->i_mode = raw_inode->i_mode;
 503         i_uid_write(inode, raw_inode->i_uid);
 504         i_gid_write(inode, raw_inode->i_gid);
 505         set_nlink(inode, raw_inode->i_nlinks);
 506         inode->i_size = raw_inode->i_size;
 507         inode->i_mtime.tv_sec = raw_inode->i_mtime;
 508         inode->i_atime.tv_sec = raw_inode->i_atime;
 509         inode->i_ctime.tv_sec = raw_inode->i_ctime;
 510         inode->i_mtime.tv_nsec = 0;
 511         inode->i_atime.tv_nsec = 0;
 512         inode->i_ctime.tv_nsec = 0;
 513         inode->i_blocks = 0;
 514         for (i = 0; i < 10; i++)
 515                 minix_inode->u.i2_data[i] = raw_inode->i_zone[i];
 516         minix_set_inode(inode, old_decode_dev(raw_inode->i_zone[0]));
 517         brelse(bh);
 518         unlock_new_inode(inode);
 519         return inode;
 520 }
 521
 522 /*
 523  * The global function to read an inode.
 524  */
 525 struct inode *minix_iget(struct super_block *sb, unsigned long ino)
 526 {
 527         struct inode *inode;
 528
 529         inode = iget_locked(sb, ino);
 530         if (!inode)
 531                 return ERR_PTR(-ENOMEM);
 532         if (!(inode->i_state & I_NEW))
 533                 return inode;
 534
 535         if (INODE_VERSION(inode) == MINIX_V1)
 536                 return V1_minix_iget(inode);
 537         else
 538                 return V2_minix_iget(inode);
 539 }
 540
 541 /*
 542  * The minix V1 function to synchronize an inode.
 543  */
 544 static struct buffer_head * V1_minix_update_inode(struct inode * inode)
 545 {
 546         struct buffer_head * bh;
 547         struct minix_inode * raw_inode;
 548         struct minix_inode_info *minix_inode = minix_i(inode);
 549         int i;
 550
 551         raw_inode = minix_V1_raw_inode(inode->i_sb, inode->i_ino, &bh);
 552         if (!raw_inode)
 553                 return NULL;
 554         raw_inode->i_mode = inode->i_mode;
 555         raw_inode->i_uid = fs_high2lowuid(i_uid_read(inode));
 556         raw_inode->i_gid = fs_high2lowgid(i_gid_read(inode));
 557         raw_inode->i_nlinks = inode->i_nlink;
 558         raw_inode->i_size = inode->i_size;
 559         raw_inode->i_time = inode->i_mtime.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 < 9; i++)
 563                 raw_inode->i_zone[i] = minix_inode->u.i1_data[i];
 564         mark_buffer_dirty(bh);
 565         return bh;
 566 }
 567
 568 /*
 569  * The minix V2 function to synchronize an inode.
 570  */
 571 static struct buffer_head * V2_minix_update_inode(struct inode * inode)
 572 {
 573         struct buffer_head * bh;
 574         struct minix2_inode * raw_inode;
 575         struct minix_inode_info *minix_inode = minix_i(inode);
 576         int i;
 577
 578         raw_inode = minix_V2_raw_inode(inode->i_sb, inode->i_ino, &bh);
 579         if (!raw_inode)
 580                 return NULL;
 581         raw_inode->i_mode = inode->i_mode;
 582         raw_inode->i_uid = fs_high2lowuid(i_uid_read(inode));
 583         raw_inode->i_gid = fs_high2lowgid(i_gid_read(inode));
 584         raw_inode->i_nlinks = inode->i_nlink;
 585         raw_inode->i_size = inode->i_size;
 586         raw_inode->i_mtime = inode->i_mtime.tv_sec;
 587         raw_inode->i_atime = inode->i_atime.tv_sec;
 588         raw_inode->i_ctime = inode->i_ctime.tv_sec;
 589         if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
 590                 raw_inode->i_zone[0] = old_encode_dev(inode->i_rdev);
 591         else for (i = 0; i < 10; i++)
 592                 raw_inode->i_zone[i] = minix_inode->u.i2_data[i];
 593         mark_buffer_dirty(bh);
 594         return bh;
 595 }
 596
 597 static int minix_write_inode(struct inode *inode, struct writeback_control *wbc)
 598 {
 599         int err = 0;
 600         struct buffer_head *bh;
 601
 602         if (INODE_VERSION(inode) == MINIX_V1)
 603                 bh = V1_minix_update_inode(inode);
 604         else
 605                 bh = V2_minix_update_inode(inode);
 606         if (!bh)
 607                 return -EIO;
 608         if (wbc->sync_mode == WB_SYNC_ALL && buffer_dirty(bh)) {
 609                 sync_dirty_buffer(bh);
 610                 if (buffer_req(bh) && !buffer_uptodate(bh)) {
 611                         printk("IO error syncing minix inode [%s:%08lx]\n",
 612                                 inode->i_sb->s_id, inode->i_ino);
 613                         err = -EIO;
 614                 }
 615         }
 616         brelse (bh);
 617         return err;
 618 }
 619
 620 int minix_getattr(const struct path *path, struct kstat *stat,
 621                   u32 request_mask, unsigned int flags)
 622 {
 623         struct super_block *sb = path->dentry->d_sb;
 624         struct inode *inode = d_inode(path->dentry);
 625
 626         generic_fillattr(inode, stat);
 627         if (INODE_VERSION(inode) == MINIX_V1)
 628                 stat->blocks = (BLOCK_SIZE / 512) * V1_minix_blocks(stat->size, sb);
 629         else
 630                 stat->blocks = (sb->s_blocksize / 512) * V2_minix_blocks(stat->size, sb);
 631         stat->blksize = sb->s_blocksize;
 632         return 0;
 633 }
 634
 635 /*
 636  * The function that is called for file truncation.
 637  */
 638 void minix_truncate(struct inode * inode)
 639 {
 640         if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode)))
 641                 return;
 642         if (INODE_VERSION(inode) == MINIX_V1)
 643                 V1_minix_truncate(inode);
 644         else
 645                 V2_minix_truncate(inode);
 646 }
 647
 648 static struct dentry *minix_mount(struct file_system_type *fs_type,
 649         int flags, const char *dev_name, void *data)
 650 {
 651         return mount_bdev(fs_type, flags, dev_name, data, minix_fill_super);
 652 }
 653
 654 static struct file_system_type minix_fs_type = {
 655         .owner          = THIS_MODULE,
 656         .name           = "minix",
 657         .mount          = minix_mount,
 658         .kill_sb        = kill_block_super,
 659         .fs_flags       = FS_REQUIRES_DEV,
 660 };
 661 MODULE_ALIAS_FS("minix");
 662
 663 static int __init init_minix_fs(void)
 664 {
 665         int err = init_inodecache();
 666         if (err)
 667                 goto out1;
 668         err = register_filesystem(&minix_fs_type);
 669         if (err)
 670                 goto out;
 671         return 0;
 672 out:
 673         destroy_inodecache();
 674 out1:
 675         return err;
 676 }
 677
 678 static void __exit exit_minix_fs(void)
 679 {
 680         unregister_filesystem(&minix_fs_type);
 681         destroy_inodecache();
 682 }
 683
 684 module_init(init_minix_fs)
 685 module_exit(exit_minix_fs)
 686 MODULE_LICENSE("GPL");
 687