root/fs/minix/inode.c

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DEFINITIONS

This source file includes following definitions.
  1. minix_evict_inode
  2. minix_put_super
  3. minix_alloc_inode
  4. minix_free_in_core_inode
  5. init_once
  6. init_inodecache
  7. destroy_inodecache
  8. minix_remount
  9. minix_fill_super
  10. minix_statfs
  11. minix_get_block
  12. minix_writepage
  13. minix_readpage
  14. minix_prepare_chunk
  15. minix_write_failed
  16. minix_write_begin
  17. minix_bmap
  18. minix_set_inode
  19. V1_minix_iget
  20. V2_minix_iget
  21. minix_iget
  22. V1_minix_update_inode
  23. V2_minix_update_inode
  24. minix_write_inode
  25. minix_getattr
  26. minix_truncate
  27. minix_mount
  28. init_minix_fs
  29. exit_minix_fs

   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         s->s_time_min = 0;
 281         s->s_time_max = U32_MAX;
 282         root_inode = minix_iget(s, MINIX_ROOT_INO);
 283         if (IS_ERR(root_inode)) {
 284                 ret = PTR_ERR(root_inode);
 285                 goto out_no_root;
 286         }
 287 
 288         ret = -ENOMEM;
 289         s->s_root = d_make_root(root_inode);
 290         if (!s->s_root)
 291                 goto out_no_root;
 292 
 293         if (!sb_rdonly(s)) {
 294                 if (sbi->s_version != MINIX_V3) /* s_state is now out from V3 sb */
 295                         ms->s_state &= ~MINIX_VALID_FS;
 296                 mark_buffer_dirty(bh);
 297         }
 298         if (!(sbi->s_mount_state & MINIX_VALID_FS))
 299                 printk("MINIX-fs: mounting unchecked file system, "
 300                         "running fsck is recommended\n");
 301         else if (sbi->s_mount_state & MINIX_ERROR_FS)
 302                 printk("MINIX-fs: mounting file system with errors, "
 303                         "running fsck is recommended\n");
 304 
 305         return 0;
 306 
 307 out_no_root:
 308         if (!silent)
 309                 printk("MINIX-fs: get root inode failed\n");
 310         goto out_freemap;
 311 
 312 out_no_bitmap:
 313         printk("MINIX-fs: bad superblock or unable to read bitmaps\n");
 314 out_freemap:
 315         for (i = 0; i < sbi->s_imap_blocks; i++)
 316                 brelse(sbi->s_imap[i]);
 317         for (i = 0; i < sbi->s_zmap_blocks; i++)
 318                 brelse(sbi->s_zmap[i]);
 319         kfree(sbi->s_imap);
 320         goto out_release;
 321 
 322 out_no_map:
 323         ret = -ENOMEM;
 324         if (!silent)
 325                 printk("MINIX-fs: can't allocate map\n");
 326         goto out_release;
 327 
 328 out_illegal_sb:
 329         if (!silent)
 330                 printk("MINIX-fs: bad superblock\n");
 331         goto out_release;
 332 
 333 out_no_fs:
 334         if (!silent)
 335                 printk("VFS: Can't find a Minix filesystem V1 | V2 | V3 "
 336                        "on device %s.\n", s->s_id);
 337 out_release:
 338         brelse(bh);
 339         goto out;
 340 
 341 out_bad_hblock:
 342         printk("MINIX-fs: blocksize too small for device\n");
 343         goto out;
 344 
 345 out_bad_sb:
 346         printk("MINIX-fs: unable to read superblock\n");
 347 out:
 348         s->s_fs_info = NULL;
 349         kfree(sbi);
 350         return ret;
 351 }
 352 
 353 static int minix_statfs(struct dentry *dentry, struct kstatfs *buf)
 354 {
 355         struct super_block *sb = dentry->d_sb;
 356         struct minix_sb_info *sbi = minix_sb(sb);
 357         u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
 358         buf->f_type = sb->s_magic;
 359         buf->f_bsize = sb->s_blocksize;
 360         buf->f_blocks = (sbi->s_nzones - sbi->s_firstdatazone) << sbi->s_log_zone_size;
 361         buf->f_bfree = minix_count_free_blocks(sb);
 362         buf->f_bavail = buf->f_bfree;
 363         buf->f_files = sbi->s_ninodes;
 364         buf->f_ffree = minix_count_free_inodes(sb);
 365         buf->f_namelen = sbi->s_namelen;
 366         buf->f_fsid.val[0] = (u32)id;
 367         buf->f_fsid.val[1] = (u32)(id >> 32);
 368 
 369         return 0;
 370 }
 371 
 372 static int minix_get_block(struct inode *inode, sector_t block,
 373                     struct buffer_head *bh_result, int create)
 374 {
 375         if (INODE_VERSION(inode) == MINIX_V1)
 376                 return V1_minix_get_block(inode, block, bh_result, create);
 377         else
 378                 return V2_minix_get_block(inode, block, bh_result, create);
 379 }
 380 
 381 static int minix_writepage(struct page *page, struct writeback_control *wbc)
 382 {
 383         return block_write_full_page(page, minix_get_block, wbc);
 384 }
 385 
 386 static int minix_readpage(struct file *file, struct page *page)
 387 {
 388         return block_read_full_page(page,minix_get_block);
 389 }
 390 
 391 int minix_prepare_chunk(struct page *page, loff_t pos, unsigned len)
 392 {
 393         return __block_write_begin(page, pos, len, minix_get_block);
 394 }
 395 
 396 static void minix_write_failed(struct address_space *mapping, loff_t to)
 397 {
 398         struct inode *inode = mapping->host;
 399 
 400         if (to > inode->i_size) {
 401                 truncate_pagecache(inode, inode->i_size);
 402                 minix_truncate(inode);
 403         }
 404 }
 405 
 406 static int minix_write_begin(struct file *file, struct address_space *mapping,
 407                         loff_t pos, unsigned len, unsigned flags,
 408                         struct page **pagep, void **fsdata)
 409 {
 410         int ret;
 411 
 412         ret = block_write_begin(mapping, pos, len, flags, pagep,
 413                                 minix_get_block);
 414         if (unlikely(ret))
 415                 minix_write_failed(mapping, pos + len);
 416 
 417         return ret;
 418 }
 419 
 420 static sector_t minix_bmap(struct address_space *mapping, sector_t block)
 421 {
 422         return generic_block_bmap(mapping,block,minix_get_block);
 423 }
 424 
 425 static const struct address_space_operations minix_aops = {
 426         .readpage = minix_readpage,
 427         .writepage = minix_writepage,
 428         .write_begin = minix_write_begin,
 429         .write_end = generic_write_end,
 430         .bmap = minix_bmap
 431 };
 432 
 433 static const struct inode_operations minix_symlink_inode_operations = {
 434         .get_link       = page_get_link,
 435         .getattr        = minix_getattr,
 436 };
 437 
 438 void minix_set_inode(struct inode *inode, dev_t rdev)
 439 {
 440         if (S_ISREG(inode->i_mode)) {
 441                 inode->i_op = &minix_file_inode_operations;
 442                 inode->i_fop = &minix_file_operations;
 443                 inode->i_mapping->a_ops = &minix_aops;
 444         } else if (S_ISDIR(inode->i_mode)) {
 445                 inode->i_op = &minix_dir_inode_operations;
 446                 inode->i_fop = &minix_dir_operations;
 447                 inode->i_mapping->a_ops = &minix_aops;
 448         } else if (S_ISLNK(inode->i_mode)) {
 449                 inode->i_op = &minix_symlink_inode_operations;
 450                 inode_nohighmem(inode);
 451                 inode->i_mapping->a_ops = &minix_aops;
 452         } else
 453                 init_special_inode(inode, inode->i_mode, rdev);
 454 }
 455 
 456 /*
 457  * The minix V1 function to read an inode.
 458  */
 459 static struct inode *V1_minix_iget(struct inode *inode)
 460 {
 461         struct buffer_head * bh;
 462         struct minix_inode * raw_inode;
 463         struct minix_inode_info *minix_inode = minix_i(inode);
 464         int i;
 465 
 466         raw_inode = minix_V1_raw_inode(inode->i_sb, inode->i_ino, &bh);
 467         if (!raw_inode) {
 468                 iget_failed(inode);
 469                 return ERR_PTR(-EIO);
 470         }
 471         inode->i_mode = raw_inode->i_mode;
 472         i_uid_write(inode, raw_inode->i_uid);
 473         i_gid_write(inode, raw_inode->i_gid);
 474         set_nlink(inode, raw_inode->i_nlinks);
 475         inode->i_size = raw_inode->i_size;
 476         inode->i_mtime.tv_sec = inode->i_atime.tv_sec = inode->i_ctime.tv_sec = raw_inode->i_time;
 477         inode->i_mtime.tv_nsec = 0;
 478         inode->i_atime.tv_nsec = 0;
 479         inode->i_ctime.tv_nsec = 0;
 480         inode->i_blocks = 0;
 481         for (i = 0; i < 9; i++)
 482                 minix_inode->u.i1_data[i] = raw_inode->i_zone[i];
 483         minix_set_inode(inode, old_decode_dev(raw_inode->i_zone[0]));
 484         brelse(bh);
 485         unlock_new_inode(inode);
 486         return inode;
 487 }
 488 
 489 /*
 490  * The minix V2 function to read an inode.
 491  */
 492 static struct inode *V2_minix_iget(struct inode *inode)
 493 {
 494         struct buffer_head * bh;
 495         struct minix2_inode * raw_inode;
 496         struct minix_inode_info *minix_inode = minix_i(inode);
 497         int i;
 498 
 499         raw_inode = minix_V2_raw_inode(inode->i_sb, inode->i_ino, &bh);
 500         if (!raw_inode) {
 501                 iget_failed(inode);
 502                 return ERR_PTR(-EIO);
 503         }
 504         inode->i_mode = raw_inode->i_mode;
 505         i_uid_write(inode, raw_inode->i_uid);
 506         i_gid_write(inode, raw_inode->i_gid);
 507         set_nlink(inode, raw_inode->i_nlinks);
 508         inode->i_size = raw_inode->i_size;
 509         inode->i_mtime.tv_sec = raw_inode->i_mtime;
 510         inode->i_atime.tv_sec = raw_inode->i_atime;
 511         inode->i_ctime.tv_sec = raw_inode->i_ctime;
 512         inode->i_mtime.tv_nsec = 0;
 513         inode->i_atime.tv_nsec = 0;
 514         inode->i_ctime.tv_nsec = 0;
 515         inode->i_blocks = 0;
 516         for (i = 0; i < 10; i++)
 517                 minix_inode->u.i2_data[i] = raw_inode->i_zone[i];
 518         minix_set_inode(inode, old_decode_dev(raw_inode->i_zone[0]));
 519         brelse(bh);
 520         unlock_new_inode(inode);
 521         return inode;
 522 }
 523 
 524 /*
 525  * The global function to read an inode.
 526  */
 527 struct inode *minix_iget(struct super_block *sb, unsigned long ino)
 528 {
 529         struct inode *inode;
 530 
 531         inode = iget_locked(sb, ino);
 532         if (!inode)
 533                 return ERR_PTR(-ENOMEM);
 534         if (!(inode->i_state & I_NEW))
 535                 return inode;
 536 
 537         if (INODE_VERSION(inode) == MINIX_V1)
 538                 return V1_minix_iget(inode);
 539         else
 540                 return V2_minix_iget(inode);
 541 }
 542 
 543 /*
 544  * The minix V1 function to synchronize an inode.
 545  */
 546 static struct buffer_head * V1_minix_update_inode(struct inode * inode)
 547 {
 548         struct buffer_head * bh;
 549         struct minix_inode * raw_inode;
 550         struct minix_inode_info *minix_inode = minix_i(inode);
 551         int i;
 552 
 553         raw_inode = minix_V1_raw_inode(inode->i_sb, inode->i_ino, &bh);
 554         if (!raw_inode)
 555                 return NULL;
 556         raw_inode->i_mode = inode->i_mode;
 557         raw_inode->i_uid = fs_high2lowuid(i_uid_read(inode));
 558         raw_inode->i_gid = fs_high2lowgid(i_gid_read(inode));
 559         raw_inode->i_nlinks = inode->i_nlink;
 560         raw_inode->i_size = inode->i_size;
 561         raw_inode->i_time = inode->i_mtime.tv_sec;
 562         if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
 563                 raw_inode->i_zone[0] = old_encode_dev(inode->i_rdev);
 564         else for (i = 0; i < 9; i++)
 565                 raw_inode->i_zone[i] = minix_inode->u.i1_data[i];
 566         mark_buffer_dirty(bh);
 567         return bh;
 568 }
 569 
 570 /*
 571  * The minix V2 function to synchronize an inode.
 572  */
 573 static struct buffer_head * V2_minix_update_inode(struct inode * inode)
 574 {
 575         struct buffer_head * bh;
 576         struct minix2_inode * raw_inode;
 577         struct minix_inode_info *minix_inode = minix_i(inode);
 578         int i;
 579 
 580         raw_inode = minix_V2_raw_inode(inode->i_sb, inode->i_ino, &bh);
 581         if (!raw_inode)
 582                 return NULL;
 583         raw_inode->i_mode = inode->i_mode;
 584         raw_inode->i_uid = fs_high2lowuid(i_uid_read(inode));
 585         raw_inode->i_gid = fs_high2lowgid(i_gid_read(inode));
 586         raw_inode->i_nlinks = inode->i_nlink;
 587         raw_inode->i_size = inode->i_size;
 588         raw_inode->i_mtime = inode->i_mtime.tv_sec;
 589         raw_inode->i_atime = inode->i_atime.tv_sec;
 590         raw_inode->i_ctime = inode->i_ctime.tv_sec;
 591         if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
 592                 raw_inode->i_zone[0] = old_encode_dev(inode->i_rdev);
 593         else for (i = 0; i < 10; i++)
 594                 raw_inode->i_zone[i] = minix_inode->u.i2_data[i];
 595         mark_buffer_dirty(bh);
 596         return bh;
 597 }
 598 
 599 static int minix_write_inode(struct inode *inode, struct writeback_control *wbc)
 600 {
 601         int err = 0;
 602         struct buffer_head *bh;
 603 
 604         if (INODE_VERSION(inode) == MINIX_V1)
 605                 bh = V1_minix_update_inode(inode);
 606         else
 607                 bh = V2_minix_update_inode(inode);
 608         if (!bh)
 609                 return -EIO;
 610         if (wbc->sync_mode == WB_SYNC_ALL && buffer_dirty(bh)) {
 611                 sync_dirty_buffer(bh);
 612                 if (buffer_req(bh) && !buffer_uptodate(bh)) {
 613                         printk("IO error syncing minix inode [%s:%08lx]\n",
 614                                 inode->i_sb->s_id, inode->i_ino);
 615                         err = -EIO;
 616                 }
 617         }
 618         brelse (bh);
 619         return err;
 620 }
 621 
 622 int minix_getattr(const struct path *path, struct kstat *stat,
 623                   u32 request_mask, unsigned int flags)
 624 {
 625         struct super_block *sb = path->dentry->d_sb;
 626         struct inode *inode = d_inode(path->dentry);
 627 
 628         generic_fillattr(inode, stat);
 629         if (INODE_VERSION(inode) == MINIX_V1)
 630                 stat->blocks = (BLOCK_SIZE / 512) * V1_minix_blocks(stat->size, sb);
 631         else
 632                 stat->blocks = (sb->s_blocksize / 512) * V2_minix_blocks(stat->size, sb);
 633         stat->blksize = sb->s_blocksize;
 634         return 0;
 635 }
 636 
 637 /*
 638  * The function that is called for file truncation.
 639  */
 640 void minix_truncate(struct inode * inode)
 641 {
 642         if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode)))
 643                 return;
 644         if (INODE_VERSION(inode) == MINIX_V1)
 645                 V1_minix_truncate(inode);
 646         else
 647                 V2_minix_truncate(inode);
 648 }
 649 
 650 static struct dentry *minix_mount(struct file_system_type *fs_type,
 651         int flags, const char *dev_name, void *data)
 652 {
 653         return mount_bdev(fs_type, flags, dev_name, data, minix_fill_super);
 654 }
 655 
 656 static struct file_system_type minix_fs_type = {
 657         .owner          = THIS_MODULE,
 658         .name           = "minix",
 659         .mount          = minix_mount,
 660         .kill_sb        = kill_block_super,
 661         .fs_flags       = FS_REQUIRES_DEV,
 662 };
 663 MODULE_ALIAS_FS("minix");
 664 
 665 static int __init init_minix_fs(void)
 666 {
 667         int err = init_inodecache();
 668         if (err)
 669                 goto out1;
 670         err = register_filesystem(&minix_fs_type);
 671         if (err)
 672                 goto out;
 673         return 0;
 674 out:
 675         destroy_inodecache();
 676 out1:
 677         return err;
 678 }
 679 
 680 static void __exit exit_minix_fs(void)
 681 {
 682         unregister_filesystem(&minix_fs_type);
 683         destroy_inodecache();
 684 }
 685 
 686 module_init(init_minix_fs)
 687 module_exit(exit_minix_fs)
 688 MODULE_LICENSE("GPL");
 689 

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