linux/fs/minix/inode.c
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   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
  22static int minix_write_inode(struct inode *inode,
  23                struct writeback_control *wbc);
  24static int minix_statfs(struct dentry *dentry, struct kstatfs *buf);
  25static int minix_remount (struct super_block * sb, int * flags, char * data);
  26
  27static 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        clear_inode(inode);
  36        if (!inode->i_nlink)
  37                minix_free_inode(inode);
  38}
  39
  40static 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
  60static struct kmem_cache * minix_inode_cachep;
  61
  62static 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
  71static 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
  77static void minix_destroy_inode(struct inode *inode)
  78{
  79        call_rcu(&inode->i_rcu, minix_i_callback);
  80}
  81
  82static 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
  89static int 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),
  95                                             init_once);
  96        if (minix_inode_cachep == NULL)
  97                return -ENOMEM;
  98        return 0;
  99}
 100
 101static 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
 111static 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
 121static 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        ms = sbi->s_ms;
 127        if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
 128                return 0;
 129        if (*flags & MS_RDONLY) {
 130                if (ms->s_state & MINIX_VALID_FS ||
 131                    !(sbi->s_mount_state & MINIX_VALID_FS))
 132                        return 0;
 133                /* Mounting a rw partition read-only. */
 134                if (sbi->s_version != MINIX_V3)
 135                        ms->s_state = sbi->s_mount_state;
 136                mark_buffer_dirty(sbi->s_sbh);
 137        } else {
 138                /* Mount a partition which is read-only, read-write. */
 139                if (sbi->s_version != MINIX_V3) {
 140                        sbi->s_mount_state = ms->s_state;
 141                        ms->s_state &= ~MINIX_VALID_FS;
 142                } else {
 143                        sbi->s_mount_state = MINIX_VALID_FS;
 144                }
 145                mark_buffer_dirty(sbi->s_sbh);
 146
 147                if (!(sbi->s_mount_state & MINIX_VALID_FS))
 148                        printk("MINIX-fs warning: remounting unchecked fs, "
 149                                "running fsck is recommended\n");
 150                else if ((sbi->s_mount_state & MINIX_ERROR_FS))
 151                        printk("MINIX-fs warning: remounting fs with errors, "
 152                                "running fsck is recommended\n");
 153        }
 154        return 0;
 155}
 156
 157static int minix_fill_super(struct super_block *s, void *data, int silent)
 158{
 159        struct buffer_head *bh;
 160        struct buffer_head **map;
 161        struct minix_super_block *ms;
 162        struct minix3_super_block *m3s = NULL;
 163        unsigned long i, block;
 164        struct inode *root_inode;
 165        struct minix_sb_info *sbi;
 166        int ret = -EINVAL;
 167
 168        sbi = kzalloc(sizeof(struct minix_sb_info), GFP_KERNEL);
 169        if (!sbi)
 170                return -ENOMEM;
 171        s->s_fs_info = sbi;
 172
 173        BUILD_BUG_ON(32 != sizeof (struct minix_inode));
 174        BUILD_BUG_ON(64 != sizeof(struct minix2_inode));
 175
 176        if (!sb_set_blocksize(s, BLOCK_SIZE))
 177                goto out_bad_hblock;
 178
 179        if (!(bh = sb_bread(s, 1)))
 180                goto out_bad_sb;
 181
 182        ms = (struct minix_super_block *) bh->b_data;
 183        sbi->s_ms = ms;
 184        sbi->s_sbh = bh;
 185        sbi->s_mount_state = ms->s_state;
 186        sbi->s_ninodes = ms->s_ninodes;
 187        sbi->s_nzones = ms->s_nzones;
 188        sbi->s_imap_blocks = ms->s_imap_blocks;
 189        sbi->s_zmap_blocks = ms->s_zmap_blocks;
 190        sbi->s_firstdatazone = ms->s_firstdatazone;
 191        sbi->s_log_zone_size = ms->s_log_zone_size;
 192        sbi->s_max_size = ms->s_max_size;
 193        s->s_magic = ms->s_magic;
 194        if (s->s_magic == MINIX_SUPER_MAGIC) {
 195                sbi->s_version = MINIX_V1;
 196                sbi->s_dirsize = 16;
 197                sbi->s_namelen = 14;
 198                s->s_max_links = MINIX_LINK_MAX;
 199        } else if (s->s_magic == MINIX_SUPER_MAGIC2) {
 200                sbi->s_version = MINIX_V1;
 201                sbi->s_dirsize = 32;
 202                sbi->s_namelen = 30;
 203                s->s_max_links = MINIX_LINK_MAX;
 204        } else if (s->s_magic == MINIX2_SUPER_MAGIC) {
 205                sbi->s_version = MINIX_V2;
 206                sbi->s_nzones = ms->s_zones;
 207                sbi->s_dirsize = 16;
 208                sbi->s_namelen = 14;
 209                s->s_max_links = MINIX2_LINK_MAX;
 210        } else if (s->s_magic == MINIX2_SUPER_MAGIC2) {
 211                sbi->s_version = MINIX_V2;
 212                sbi->s_nzones = ms->s_zones;
 213                sbi->s_dirsize = 32;
 214                sbi->s_namelen = 30;
 215                s->s_max_links = MINIX2_LINK_MAX;
 216        } else if ( *(__u16 *)(bh->b_data + 24) == MINIX3_SUPER_MAGIC) {
 217                m3s = (struct minix3_super_block *) bh->b_data;
 218                s->s_magic = m3s->s_magic;
 219                sbi->s_imap_blocks = m3s->s_imap_blocks;
 220                sbi->s_zmap_blocks = m3s->s_zmap_blocks;
 221                sbi->s_firstdatazone = m3s->s_firstdatazone;
 222                sbi->s_log_zone_size = m3s->s_log_zone_size;
 223                sbi->s_max_size = m3s->s_max_size;
 224                sbi->s_ninodes = m3s->s_ninodes;
 225                sbi->s_nzones = m3s->s_zones;
 226                sbi->s_dirsize = 64;
 227                sbi->s_namelen = 60;
 228                sbi->s_version = MINIX_V3;
 229                sbi->s_mount_state = MINIX_VALID_FS;
 230                sb_set_blocksize(s, m3s->s_blocksize);
 231                s->s_max_links = MINIX2_LINK_MAX;
 232        } else
 233                goto out_no_fs;
 234
 235        /*
 236         * Allocate the buffer map to keep the superblock small.
 237         */
 238        if (sbi->s_imap_blocks == 0 || sbi->s_zmap_blocks == 0)
 239                goto out_illegal_sb;
 240        i = (sbi->s_imap_blocks + sbi->s_zmap_blocks) * sizeof(bh);
 241        map = kzalloc(i, GFP_KERNEL);
 242        if (!map)
 243                goto out_no_map;
 244        sbi->s_imap = &map[0];
 245        sbi->s_zmap = &map[sbi->s_imap_blocks];
 246
 247        block=2;
 248        for (i=0 ; i < sbi->s_imap_blocks ; i++) {
 249                if (!(sbi->s_imap[i]=sb_bread(s, block)))
 250                        goto out_no_bitmap;
 251                block++;
 252        }
 253        for (i=0 ; i < sbi->s_zmap_blocks ; i++) {
 254                if (!(sbi->s_zmap[i]=sb_bread(s, block)))
 255                        goto out_no_bitmap;
 256                block++;
 257        }
 258
 259        minix_set_bit(0,sbi->s_imap[0]->b_data);
 260        minix_set_bit(0,sbi->s_zmap[0]->b_data);
 261
 262        /* Apparently minix can create filesystems that allocate more blocks for
 263         * the bitmaps than needed.  We simply ignore that, but verify it didn't
 264         * create one with not enough blocks and bail out if so.
 265         */
 266        block = minix_blocks_needed(sbi->s_ninodes, s->s_blocksize);
 267        if (sbi->s_imap_blocks < block) {
 268                printk("MINIX-fs: file system does not have enough "
 269                                "imap blocks allocated.  Refusing to mount\n");
 270                goto out_no_bitmap;
 271        }
 272
 273        block = minix_blocks_needed(
 274                        (sbi->s_nzones - (sbi->s_firstdatazone + 1)),
 275                        s->s_blocksize);
 276        if (sbi->s_zmap_blocks < block) {
 277                printk("MINIX-fs: file system does not have enough "
 278                                "zmap blocks allocated.  Refusing to mount.\n");
 279                goto out_no_bitmap;
 280        }
 281
 282        /* set up enough so that it can read an inode */
 283        s->s_op = &minix_sops;
 284        root_inode = minix_iget(s, MINIX_ROOT_INO);
 285        if (IS_ERR(root_inode)) {
 286                ret = PTR_ERR(root_inode);
 287                goto out_no_root;
 288        }
 289
 290        ret = -ENOMEM;
 291        s->s_root = d_make_root(root_inode);
 292        if (!s->s_root)
 293                goto out_no_root;
 294
 295        if (!(s->s_flags & MS_RDONLY)) {
 296                if (sbi->s_version != MINIX_V3) /* s_state is now out from V3 sb */
 297                        ms->s_state &= ~MINIX_VALID_FS;
 298                mark_buffer_dirty(bh);
 299        }
 300        if (!(sbi->s_mount_state & MINIX_VALID_FS))
 301                printk("MINIX-fs: mounting unchecked file system, "
 302                        "running fsck is recommended\n");
 303        else if (sbi->s_mount_state & MINIX_ERROR_FS)
 304                printk("MINIX-fs: mounting file system with errors, "
 305                        "running fsck is recommended\n");
 306
 307        return 0;
 308
 309out_no_root:
 310        if (!silent)
 311                printk("MINIX-fs: get root inode failed\n");
 312        goto out_freemap;
 313
 314out_no_bitmap:
 315        printk("MINIX-fs: bad superblock or unable to read bitmaps\n");
 316out_freemap:
 317        for (i = 0; i < sbi->s_imap_blocks; i++)
 318                brelse(sbi->s_imap[i]);
 319        for (i = 0; i < sbi->s_zmap_blocks; i++)
 320                brelse(sbi->s_zmap[i]);
 321        kfree(sbi->s_imap);
 322        goto out_release;
 323
 324out_no_map:
 325        ret = -ENOMEM;
 326        if (!silent)
 327                printk("MINIX-fs: can't allocate map\n");
 328        goto out_release;
 329
 330out_illegal_sb:
 331        if (!silent)
 332                printk("MINIX-fs: bad superblock\n");
 333        goto out_release;
 334
 335out_no_fs:
 336        if (!silent)
 337                printk("VFS: Can't find a Minix filesystem V1 | V2 | V3 "
 338                       "on device %s.\n", s->s_id);
 339out_release:
 340        brelse(bh);
 341        goto out;
 342
 343out_bad_hblock:
 344        printk("MINIX-fs: blocksize too small for device\n");
 345        goto out;
 346
 347out_bad_sb:
 348        printk("MINIX-fs: unable to read superblock\n");
 349out:
 350        s->s_fs_info = NULL;
 351        kfree(sbi);
 352        return ret;
 353}
 354
 355static int minix_statfs(struct dentry *dentry, struct kstatfs *buf)
 356{
 357        struct super_block *sb = dentry->d_sb;
 358        struct minix_sb_info *sbi = minix_sb(sb);
 359        u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
 360        buf->f_type = sb->s_magic;
 361        buf->f_bsize = sb->s_blocksize;
 362        buf->f_blocks = (sbi->s_nzones - sbi->s_firstdatazone) << sbi->s_log_zone_size;
 363        buf->f_bfree = minix_count_free_blocks(sb);
 364        buf->f_bavail = buf->f_bfree;
 365        buf->f_files = sbi->s_ninodes;
 366        buf->f_ffree = minix_count_free_inodes(sb);
 367        buf->f_namelen = sbi->s_namelen;
 368        buf->f_fsid.val[0] = (u32)id;
 369        buf->f_fsid.val[1] = (u32)(id >> 32);
 370
 371        return 0;
 372}
 373
 374static int minix_get_block(struct inode *inode, sector_t block,
 375                    struct buffer_head *bh_result, int create)
 376{
 377        if (INODE_VERSION(inode) == MINIX_V1)
 378                return V1_minix_get_block(inode, block, bh_result, create);
 379        else
 380                return V2_minix_get_block(inode, block, bh_result, create);
 381}
 382
 383static int minix_writepage(struct page *page, struct writeback_control *wbc)
 384{
 385        return block_write_full_page(page, minix_get_block, wbc);
 386}
 387
 388static int minix_readpage(struct file *file, struct page *page)
 389{
 390        return block_read_full_page(page,minix_get_block);
 391}
 392
 393int minix_prepare_chunk(struct page *page, loff_t pos, unsigned len)
 394{
 395        return __block_write_begin(page, pos, len, minix_get_block);
 396}
 397
 398static int minix_write_begin(struct file *file, struct address_space *mapping,
 399                        loff_t pos, unsigned len, unsigned flags,
 400                        struct page **pagep, void **fsdata)
 401{
 402        int ret;
 403
 404        ret = block_write_begin(mapping, pos, len, flags, pagep,
 405                                minix_get_block);
 406        if (unlikely(ret)) {
 407                loff_t isize = mapping->host->i_size;
 408                if (pos + len > isize)
 409                        vmtruncate(mapping->host, isize);
 410        }
 411
 412        return ret;
 413}
 414
 415static sector_t minix_bmap(struct address_space *mapping, sector_t block)
 416{
 417        return generic_block_bmap(mapping,block,minix_get_block);
 418}
 419
 420static const struct address_space_operations minix_aops = {
 421        .readpage = minix_readpage,
 422        .writepage = minix_writepage,
 423        .write_begin = minix_write_begin,
 424        .write_end = generic_write_end,
 425        .bmap = minix_bmap
 426};
 427
 428static const struct inode_operations minix_symlink_inode_operations = {
 429        .readlink       = generic_readlink,
 430        .follow_link    = page_follow_link_light,
 431        .put_link       = page_put_link,
 432        .getattr        = minix_getattr,
 433};
 434
 435void minix_set_inode(struct inode *inode, dev_t rdev)
 436{
 437        if (S_ISREG(inode->i_mode)) {
 438                inode->i_op = &minix_file_inode_operations;
 439                inode->i_fop = &minix_file_operations;
 440                inode->i_mapping->a_ops = &minix_aops;
 441        } else if (S_ISDIR(inode->i_mode)) {
 442                inode->i_op = &minix_dir_inode_operations;
 443                inode->i_fop = &minix_dir_operations;
 444                inode->i_mapping->a_ops = &minix_aops;
 445        } else if (S_ISLNK(inode->i_mode)) {
 446                inode->i_op = &minix_symlink_inode_operations;
 447                inode->i_mapping->a_ops = &minix_aops;
 448        } else
 449                init_special_inode(inode, inode->i_mode, rdev);
 450}
 451
 452/*
 453 * The minix V1 function to read an inode.
 454 */
 455static struct inode *V1_minix_iget(struct inode *inode)
 456{
 457        struct buffer_head * bh;
 458        struct minix_inode * raw_inode;
 459        struct minix_inode_info *minix_inode = minix_i(inode);
 460        int i;
 461
 462        raw_inode = minix_V1_raw_inode(inode->i_sb, inode->i_ino, &bh);
 463        if (!raw_inode) {
 464                iget_failed(inode);
 465                return ERR_PTR(-EIO);
 466        }
 467        inode->i_mode = raw_inode->i_mode;
 468        i_uid_write(inode, raw_inode->i_uid);
 469        i_gid_write(inode, raw_inode->i_gid);
 470        set_nlink(inode, raw_inode->i_nlinks);
 471        inode->i_size = raw_inode->i_size;
 472        inode->i_mtime.tv_sec = inode->i_atime.tv_sec = inode->i_ctime.tv_sec = raw_inode->i_time;
 473        inode->i_mtime.tv_nsec = 0;
 474        inode->i_atime.tv_nsec = 0;
 475        inode->i_ctime.tv_nsec = 0;
 476        inode->i_blocks = 0;
 477        for (i = 0; i < 9; i++)
 478                minix_inode->u.i1_data[i] = raw_inode->i_zone[i];
 479        minix_set_inode(inode, old_decode_dev(raw_inode->i_zone[0]));
 480        brelse(bh);
 481        unlock_new_inode(inode);
 482        return inode;
 483}
 484
 485/*
 486 * The minix V2 function to read an inode.
 487 */
 488static struct inode *V2_minix_iget(struct inode *inode)
 489{
 490        struct buffer_head * bh;
 491        struct minix2_inode * raw_inode;
 492        struct minix_inode_info *minix_inode = minix_i(inode);
 493        int i;
 494
 495        raw_inode = minix_V2_raw_inode(inode->i_sb, inode->i_ino, &bh);
 496        if (!raw_inode) {
 497                iget_failed(inode);
 498                return ERR_PTR(-EIO);
 499        }
 500        inode->i_mode = raw_inode->i_mode;
 501        i_uid_write(inode, raw_inode->i_uid);
 502        i_gid_write(inode, raw_inode->i_gid);
 503        set_nlink(inode, raw_inode->i_nlinks);
 504        inode->i_size = raw_inode->i_size;
 505        inode->i_mtime.tv_sec = raw_inode->i_mtime;
 506        inode->i_atime.tv_sec = raw_inode->i_atime;
 507        inode->i_ctime.tv_sec = raw_inode->i_ctime;
 508        inode->i_mtime.tv_nsec = 0;
 509        inode->i_atime.tv_nsec = 0;
 510        inode->i_ctime.tv_nsec = 0;
 511        inode->i_blocks = 0;
 512        for (i = 0; i < 10; i++)
 513                minix_inode->u.i2_data[i] = raw_inode->i_zone[i];
 514        minix_set_inode(inode, old_decode_dev(raw_inode->i_zone[0]));
 515        brelse(bh);
 516        unlock_new_inode(inode);
 517        return inode;
 518}
 519
 520/*
 521 * The global function to read an inode.
 522 */
 523struct inode *minix_iget(struct super_block *sb, unsigned long ino)
 524{
 525        struct inode *inode;
 526
 527        inode = iget_locked(sb, ino);
 528        if (!inode)
 529                return ERR_PTR(-ENOMEM);
 530        if (!(inode->i_state & I_NEW))
 531                return inode;
 532
 533        if (INODE_VERSION(inode) == MINIX_V1)
 534                return V1_minix_iget(inode);
 535        else
 536                return V2_minix_iget(inode);
 537}
 538
 539/*
 540 * The minix V1 function to synchronize an inode.
 541 */
 542static struct buffer_head * V1_minix_update_inode(struct inode * inode)
 543{
 544        struct buffer_head * bh;
 545        struct minix_inode * raw_inode;
 546        struct minix_inode_info *minix_inode = minix_i(inode);
 547        int i;
 548
 549        raw_inode = minix_V1_raw_inode(inode->i_sb, inode->i_ino, &bh);
 550        if (!raw_inode)
 551                return NULL;
 552        raw_inode->i_mode = inode->i_mode;
 553        raw_inode->i_uid = fs_high2lowuid(i_uid_read(inode));
 554        raw_inode->i_gid = fs_high2lowgid(i_gid_read(inode));
 555        raw_inode->i_nlinks = inode->i_nlink;
 556        raw_inode->i_size = inode->i_size;
 557        raw_inode->i_time = inode->i_mtime.tv_sec;
 558        if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
 559                raw_inode->i_zone[0] = old_encode_dev(inode->i_rdev);
 560        else for (i = 0; i < 9; i++)
 561                raw_inode->i_zone[i] = minix_inode->u.i1_data[i];
 562        mark_buffer_dirty(bh);
 563        return bh;
 564}
 565
 566/*
 567 * The minix V2 function to synchronize an inode.
 568 */
 569static struct buffer_head * V2_minix_update_inode(struct inode * inode)
 570{
 571        struct buffer_head * bh;
 572        struct minix2_inode * raw_inode;
 573        struct minix_inode_info *minix_inode = minix_i(inode);
 574        int i;
 575
 576        raw_inode = minix_V2_raw_inode(inode->i_sb, inode->i_ino, &bh);
 577        if (!raw_inode)
 578                return NULL;
 579        raw_inode->i_mode = inode->i_mode;
 580        raw_inode->i_uid = fs_high2lowuid(i_uid_read(inode));
 581        raw_inode->i_gid = fs_high2lowgid(i_gid_read(inode));
 582        raw_inode->i_nlinks = inode->i_nlink;
 583        raw_inode->i_size = inode->i_size;
 584        raw_inode->i_mtime = inode->i_mtime.tv_sec;
 585        raw_inode->i_atime = inode->i_atime.tv_sec;
 586        raw_inode->i_ctime = inode->i_ctime.tv_sec;
 587        if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
 588                raw_inode->i_zone[0] = old_encode_dev(inode->i_rdev);
 589        else for (i = 0; i < 10; i++)
 590                raw_inode->i_zone[i] = minix_inode->u.i2_data[i];
 591        mark_buffer_dirty(bh);
 592        return bh;
 593}
 594
 595static int minix_write_inode(struct inode *inode, struct writeback_control *wbc)
 596{
 597        int err = 0;
 598        struct buffer_head *bh;
 599
 600        if (INODE_VERSION(inode) == MINIX_V1)
 601                bh = V1_minix_update_inode(inode);
 602        else
 603                bh = V2_minix_update_inode(inode);
 604        if (!bh)
 605                return -EIO;
 606        if (wbc->sync_mode == WB_SYNC_ALL && buffer_dirty(bh)) {
 607                sync_dirty_buffer(bh);
 608                if (buffer_req(bh) && !buffer_uptodate(bh)) {
 609                        printk("IO error syncing minix inode [%s:%08lx]\n",
 610                                inode->i_sb->s_id, inode->i_ino);
 611                        err = -EIO;
 612                }
 613        }
 614        brelse (bh);
 615        return err;
 616}
 617
 618int minix_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
 619{
 620        struct super_block *sb = dentry->d_sb;
 621        generic_fillattr(dentry->d_inode, stat);
 622        if (INODE_VERSION(dentry->d_inode) == MINIX_V1)
 623                stat->blocks = (BLOCK_SIZE / 512) * V1_minix_blocks(stat->size, sb);
 624        else
 625                stat->blocks = (sb->s_blocksize / 512) * V2_minix_blocks(stat->size, sb);
 626        stat->blksize = sb->s_blocksize;
 627        return 0;
 628}
 629
 630/*
 631 * The function that is called for file truncation.
 632 */
 633void minix_truncate(struct inode * inode)
 634{
 635        if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode)))
 636                return;
 637        if (INODE_VERSION(inode) == MINIX_V1)
 638                V1_minix_truncate(inode);
 639        else
 640                V2_minix_truncate(inode);
 641}
 642
 643static struct dentry *minix_mount(struct file_system_type *fs_type,
 644        int flags, const char *dev_name, void *data)
 645{
 646        return mount_bdev(fs_type, flags, dev_name, data, minix_fill_super);
 647}
 648
 649static struct file_system_type minix_fs_type = {
 650        .owner          = THIS_MODULE,
 651        .name           = "minix",
 652        .mount          = minix_mount,
 653        .kill_sb        = kill_block_super,
 654        .fs_flags       = FS_REQUIRES_DEV,
 655};
 656
 657static int __init init_minix_fs(void)
 658{
 659        int err = init_inodecache();
 660        if (err)
 661                goto out1;
 662        err = register_filesystem(&minix_fs_type);
 663        if (err)
 664                goto out;
 665        return 0;
 666out:
 667        destroy_inodecache();
 668out1:
 669        return err;
 670}
 671
 672static void __exit exit_minix_fs(void)
 673{
 674        unregister_filesystem(&minix_fs_type);
 675        destroy_inodecache();
 676}
 677
 678module_init(init_minix_fs)
 679module_exit(exit_minix_fs)
 680MODULE_LICENSE("GPL");
 681
 682
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