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        kmem_cache_destroy(minix_inode_cachep);
 104}
 105
 106static const struct super_operations minix_sops = {
 107        .alloc_inode    = minix_alloc_inode,
 108        .destroy_inode  = minix_destroy_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
 116static 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        ms = sbi->s_ms;
 122        if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
 123                return 0;
 124        if (*flags & MS_RDONLY) {
 125                if (ms->s_state & MINIX_VALID_FS ||
 126                    !(sbi->s_mount_state & MINIX_VALID_FS))
 127                        return 0;
 128                /* Mounting a rw partition read-only. */
 129                if (sbi->s_version != MINIX_V3)
 130                        ms->s_state = sbi->s_mount_state;
 131                mark_buffer_dirty(sbi->s_sbh);
 132        } else {
 133                /* Mount a partition which is read-only, read-write. */
 134                if (sbi->s_version != MINIX_V3) {
 135                        sbi->s_mount_state = ms->s_state;
 136                        ms->s_state &= ~MINIX_VALID_FS;
 137                } else {
 138                        sbi->s_mount_state = MINIX_VALID_FS;
 139                }
 140                mark_buffer_dirty(sbi->s_sbh);
 141
 142                if (!(sbi->s_mount_state & MINIX_VALID_FS))
 143                        printk("MINIX-fs warning: remounting unchecked fs, "
 144                                "running fsck is recommended\n");
 145                else if ((sbi->s_mount_state & MINIX_ERROR_FS))
 146                        printk("MINIX-fs warning: remounting fs with errors, "
 147                                "running fsck is recommended\n");
 148        }
 149        return 0;
 150}
 151
 152static int minix_fill_super(struct super_block *s, void *data, int silent)
 153{
 154        struct buffer_head *bh;
 155        struct buffer_head **map;
 156        struct minix_super_block *ms;
 157        struct minix3_super_block *m3s = NULL;
 158        unsigned long i, block;
 159        struct inode *root_inode;
 160        struct minix_sb_info *sbi;
 161        int ret = -EINVAL;
 162
 163        sbi = kzalloc(sizeof(struct minix_sb_info), GFP_KERNEL);
 164        if (!sbi)
 165                return -ENOMEM;
 166        s->s_fs_info = sbi;
 167
 168        BUILD_BUG_ON(32 != sizeof (struct minix_inode));
 169        BUILD_BUG_ON(64 != sizeof(struct minix2_inode));
 170
 171        if (!sb_set_blocksize(s, BLOCK_SIZE))
 172                goto out_bad_hblock;
 173
 174        if (!(bh = sb_bread(s, 1)))
 175                goto out_bad_sb;
 176
 177        ms = (struct minix_super_block *) bh->b_data;
 178        sbi->s_ms = ms;
 179        sbi->s_sbh = bh;
 180        sbi->s_mount_state = ms->s_state;
 181        sbi->s_ninodes = ms->s_ninodes;
 182        sbi->s_nzones = ms->s_nzones;
 183        sbi->s_imap_blocks = ms->s_imap_blocks;
 184        sbi->s_zmap_blocks = ms->s_zmap_blocks;
 185        sbi->s_firstdatazone = ms->s_firstdatazone;
 186        sbi->s_log_zone_size = ms->s_log_zone_size;
 187        sbi->s_max_size = ms->s_max_size;
 188        s->s_magic = ms->s_magic;
 189        if (s->s_magic == MINIX_SUPER_MAGIC) {
 190                sbi->s_version = MINIX_V1;
 191                sbi->s_dirsize = 16;
 192                sbi->s_namelen = 14;
 193                s->s_max_links = MINIX_LINK_MAX;
 194        } else if (s->s_magic == MINIX_SUPER_MAGIC2) {
 195                sbi->s_version = MINIX_V1;
 196                sbi->s_dirsize = 32;
 197                sbi->s_namelen = 30;
 198                s->s_max_links = MINIX_LINK_MAX;
 199        } else if (s->s_magic == MINIX2_SUPER_MAGIC) {
 200                sbi->s_version = MINIX_V2;
 201                sbi->s_nzones = ms->s_zones;
 202                sbi->s_dirsize = 16;
 203                sbi->s_namelen = 14;
 204                s->s_max_links = MINIX2_LINK_MAX;
 205        } else if (s->s_magic == MINIX2_SUPER_MAGIC2) {
 206                sbi->s_version = MINIX_V2;
 207                sbi->s_nzones = ms->s_zones;
 208                sbi->s_dirsize = 32;
 209                sbi->s_namelen = 30;
 210                s->s_max_links = MINIX2_LINK_MAX;
 211        } else if ( *(__u16 *)(bh->b_data + 24) == MINIX3_SUPER_MAGIC) {
 212                m3s = (struct minix3_super_block *) bh->b_data;
 213                s->s_magic = m3s->s_magic;
 214                sbi->s_imap_blocks = m3s->s_imap_blocks;
 215                sbi->s_zmap_blocks = m3s->s_zmap_blocks;
 216                sbi->s_firstdatazone = m3s->s_firstdatazone;
 217                sbi->s_log_zone_size = m3s->s_log_zone_size;
 218                sbi->s_max_size = m3s->s_max_size;
 219                sbi->s_ninodes = m3s->s_ninodes;
 220                sbi->s_nzones = m3s->s_zones;
 221                sbi->s_dirsize = 64;
 222                sbi->s_namelen = 60;
 223                sbi->s_version = MINIX_V3;
 224                sbi->s_mount_state = MINIX_VALID_FS;
 225                sb_set_blocksize(s, m3s->s_blocksize);
 226                s->s_max_links = MINIX2_LINK_MAX;
 227        } else
 228                goto out_no_fs;
 229
 230        /*
 231         * Allocate the buffer map to keep the superblock small.
 232         */
 233        if (sbi->s_imap_blocks == 0 || sbi->s_zmap_blocks == 0)
 234                goto out_illegal_sb;
 235        i = (sbi->s_imap_blocks + sbi->s_zmap_blocks) * sizeof(bh);
 236        map = kzalloc(i, GFP_KERNEL);
 237        if (!map)
 238                goto out_no_map;
 239        sbi->s_imap = &map[0];
 240        sbi->s_zmap = &map[sbi->s_imap_blocks];
 241
 242        block=2;
 243        for (i=0 ; i < sbi->s_imap_blocks ; i++) {
 244                if (!(sbi->s_imap[i]=sb_bread(s, block)))
 245                        goto out_no_bitmap;
 246                block++;
 247        }
 248        for (i=0 ; i < sbi->s_zmap_blocks ; i++) {
 249                if (!(sbi->s_zmap[i]=sb_bread(s, block)))
 250                        goto out_no_bitmap;
 251                block++;
 252        }
 253
 254        minix_set_bit(0,sbi->s_imap[0]->b_data);
 255        minix_set_bit(0,sbi->s_zmap[0]->b_data);
 256
 257        /* Apparently minix can create filesystems that allocate more blocks for
 258         * the bitmaps than needed.  We simply ignore that, but verify it didn't
 259         * create one with not enough blocks and bail out if so.
 260         */
 261        block = minix_blocks_needed(sbi->s_ninodes, s->s_blocksize);
 262        if (sbi->s_imap_blocks < block) {
 263                printk("MINIX-fs: file system does not have enough "
 264                                "imap blocks allocated.  Refusing to mount\n");
 265                goto out_no_bitmap;
 266        }
 267
 268        block = minix_blocks_needed(
 269                        (sbi->s_nzones - (sbi->s_firstdatazone + 1)),
 270                        s->s_blocksize);
 271        if (sbi->s_zmap_blocks < block) {
 272                printk("MINIX-fs: file system does not have enough "
 273                                "zmap blocks allocated.  Refusing to mount.\n");
 274                goto out_no_bitmap;
 275        }
 276
 277        /* set up enough so that it can read an inode */
 278        s->s_op = &minix_sops;
 279        root_inode = minix_iget(s, MINIX_ROOT_INO);
 280        if (IS_ERR(root_inode)) {
 281                ret = PTR_ERR(root_inode);
 282                goto out_no_root;
 283        }
 284
 285        ret = -ENOMEM;
 286        s->s_root = d_make_root(root_inode);
 287        if (!s->s_root)
 288                goto out_no_root;
 289
 290        if (!(s->s_flags & MS_RDONLY)) {
 291                if (sbi->s_version != MINIX_V3) /* s_state is now out from V3 sb */
 292                        ms->s_state &= ~MINIX_VALID_FS;
 293                mark_buffer_dirty(bh);
 294        }
 295        if (!(sbi->s_mount_state & MINIX_VALID_FS))
 296                printk("MINIX-fs: mounting unchecked file system, "
 297                        "running fsck is recommended\n");
 298        else if (sbi->s_mount_state & MINIX_ERROR_FS)
 299                printk("MINIX-fs: mounting file system with errors, "
 300                        "running fsck is recommended\n");
 301
 302        return 0;
 303
 304out_no_root:
 305        if (!silent)
 306                printk("MINIX-fs: get root inode failed\n");
 307        goto out_freemap;
 308
 309out_no_bitmap:
 310        printk("MINIX-fs: bad superblock or unable to read bitmaps\n");
 311out_freemap:
 312        for (i = 0; i < sbi->s_imap_blocks; i++)
 313                brelse(sbi->s_imap[i]);
 314        for (i = 0; i < sbi->s_zmap_blocks; i++)
 315                brelse(sbi->s_zmap[i]);
 316        kfree(sbi->s_imap);
 317        goto out_release;
 318
 319out_no_map:
 320        ret = -ENOMEM;
 321        if (!silent)
 322                printk("MINIX-fs: can't allocate map\n");
 323        goto out_release;
 324
 325out_illegal_sb:
 326        if (!silent)
 327                printk("MINIX-fs: bad superblock\n");
 328        goto out_release;
 329
 330out_no_fs:
 331        if (!silent)
 332                printk("VFS: Can't find a Minix filesystem V1 | V2 | V3 "
 333                       "on device %s.\n", s->s_id);
 334out_release:
 335        brelse(bh);
 336        goto out;
 337
 338out_bad_hblock:
 339        printk("MINIX-fs: blocksize too small for device\n");
 340        goto out;
 341
 342out_bad_sb:
 343        printk("MINIX-fs: unable to read superblock\n");
 344out:
 345        s->s_fs_info = NULL;
 346        kfree(sbi);
 347        return ret;
 348}
 349
 350static int minix_statfs(struct dentry *dentry, struct kstatfs *buf)
 351{
 352        struct super_block *sb = dentry->d_sb;
 353        struct minix_sb_info *sbi = minix_sb(sb);
 354        u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
 355        buf->f_type = sb->s_magic;
 356        buf->f_bsize = sb->s_blocksize;
 357        buf->f_blocks = (sbi->s_nzones - sbi->s_firstdatazone) << sbi->s_log_zone_size;
 358        buf->f_bfree = minix_count_free_blocks(sb);
 359        buf->f_bavail = buf->f_bfree;
 360        buf->f_files = sbi->s_ninodes;
 361        buf->f_ffree = minix_count_free_inodes(sb);
 362        buf->f_namelen = sbi->s_namelen;
 363        buf->f_fsid.val[0] = (u32)id;
 364        buf->f_fsid.val[1] = (u32)(id >> 32);
 365
 366        return 0;
 367}
 368
 369static int minix_get_block(struct inode *inode, sector_t block,
 370                    struct buffer_head *bh_result, int create)
 371{
 372        if (INODE_VERSION(inode) == MINIX_V1)
 373                return V1_minix_get_block(inode, block, bh_result, create);
 374        else
 375                return V2_minix_get_block(inode, block, bh_result, create);
 376}
 377
 378static int minix_writepage(struct page *page, struct writeback_control *wbc)
 379{
 380        return block_write_full_page(page, minix_get_block, wbc);
 381}
 382
 383static int minix_readpage(struct file *file, struct page *page)
 384{
 385        return block_read_full_page(page,minix_get_block);
 386}
 387
 388int minix_prepare_chunk(struct page *page, loff_t pos, unsigned len)
 389{
 390        return __block_write_begin(page, pos, len, minix_get_block);
 391}
 392
 393static int minix_write_begin(struct file *file, struct address_space *mapping,
 394                        loff_t pos, unsigned len, unsigned flags,
 395                        struct page **pagep, void **fsdata)
 396{
 397        int ret;
 398
 399        ret = block_write_begin(mapping, pos, len, flags, pagep,
 400                                minix_get_block);
 401        if (unlikely(ret)) {
 402                loff_t isize = mapping->host->i_size;
 403                if (pos + len > isize)
 404                        vmtruncate(mapping->host, isize);
 405        }
 406
 407        return ret;
 408}
 409
 410static sector_t minix_bmap(struct address_space *mapping, sector_t block)
 411{
 412        return generic_block_bmap(mapping,block,minix_get_block);
 413}
 414
 415static const struct address_space_operations minix_aops = {
 416        .readpage = minix_readpage,
 417        .writepage = minix_writepage,
 418        .write_begin = minix_write_begin,
 419        .write_end = generic_write_end,
 420        .bmap = minix_bmap
 421};
 422
 423static const struct inode_operations minix_symlink_inode_operations = {
 424        .readlink       = generic_readlink,
 425        .follow_link    = page_follow_link_light,
 426        .put_link       = page_put_link,
 427        .getattr        = minix_getattr,
 428};
 429
 430void minix_set_inode(struct inode *inode, dev_t rdev)
 431{
 432        if (S_ISREG(inode->i_mode)) {
 433                inode->i_op = &minix_file_inode_operations;
 434                inode->i_fop = &minix_file_operations;
 435                inode->i_mapping->a_ops = &minix_aops;
 436        } else if (S_ISDIR(inode->i_mode)) {
 437                inode->i_op = &minix_dir_inode_operations;
 438                inode->i_fop = &minix_dir_operations;
 439                inode->i_mapping->a_ops = &minix_aops;
 440        } else if (S_ISLNK(inode->i_mode)) {
 441                inode->i_op = &minix_symlink_inode_operations;
 442                inode->i_mapping->a_ops = &minix_aops;
 443        } else
 444                init_special_inode(inode, inode->i_mode, rdev);
 445}
 446
 447/*
 448 * The minix V1 function to read an inode.
 449 */
 450static struct inode *V1_minix_iget(struct inode *inode)
 451{
 452        struct buffer_head * bh;
 453        struct minix_inode * raw_inode;
 454        struct minix_inode_info *minix_inode = minix_i(inode);
 455        int i;
 456
 457        raw_inode = minix_V1_raw_inode(inode->i_sb, inode->i_ino, &bh);
 458        if (!raw_inode) {
 459                iget_failed(inode);
 460                return ERR_PTR(-EIO);
 461        }
 462        inode->i_mode = raw_inode->i_mode;
 463        inode->i_uid = (uid_t)raw_inode->i_uid;
 464        inode->i_gid = (gid_t)raw_inode->i_gid;
 465        set_nlink(inode, raw_inode->i_nlinks);
 466        inode->i_size = raw_inode->i_size;
 467        inode->i_mtime.tv_sec = inode->i_atime.tv_sec = inode->i_ctime.tv_sec = raw_inode->i_time;
 468        inode->i_mtime.tv_nsec = 0;
 469        inode->i_atime.tv_nsec = 0;
 470        inode->i_ctime.tv_nsec = 0;
 471        inode->i_blocks = 0;
 472        for (i = 0; i < 9; i++)
 473                minix_inode->u.i1_data[i] = raw_inode->i_zone[i];
 474        minix_set_inode(inode, old_decode_dev(raw_inode->i_zone[0]));
 475        brelse(bh);
 476        unlock_new_inode(inode);
 477        return inode;
 478}
 479
 480/*
 481 * The minix V2 function to read an inode.
 482 */
 483static struct inode *V2_minix_iget(struct inode *inode)
 484{
 485        struct buffer_head * bh;
 486        struct minix2_inode * raw_inode;
 487        struct minix_inode_info *minix_inode = minix_i(inode);
 488        int i;
 489
 490        raw_inode = minix_V2_raw_inode(inode->i_sb, inode->i_ino, &bh);
 491        if (!raw_inode) {
 492                iget_failed(inode);
 493                return ERR_PTR(-EIO);
 494        }
 495        inode->i_mode = raw_inode->i_mode;
 496        inode->i_uid = (uid_t)raw_inode->i_uid;
 497        inode->i_gid = (gid_t)raw_inode->i_gid;
 498        set_nlink(inode, raw_inode->i_nlinks);
 499        inode->i_size = raw_inode->i_size;
 500        inode->i_mtime.tv_sec = raw_inode->i_mtime;
 501        inode->i_atime.tv_sec = raw_inode->i_atime;
 502        inode->i_ctime.tv_sec = raw_inode->i_ctime;
 503        inode->i_mtime.tv_nsec = 0;
 504        inode->i_atime.tv_nsec = 0;
 505        inode->i_ctime.tv_nsec = 0;
 506        inode->i_blocks = 0;
 507        for (i = 0; i < 10; i++)
 508                minix_inode->u.i2_data[i] = raw_inode->i_zone[i];
 509        minix_set_inode(inode, old_decode_dev(raw_inode->i_zone[0]));
 510        brelse(bh);
 511        unlock_new_inode(inode);
 512        return inode;
 513}
 514
 515/*
 516 * The global function to read an inode.
 517 */
 518struct inode *minix_iget(struct super_block *sb, unsigned long ino)
 519{
 520        struct inode *inode;
 521
 522        inode = iget_locked(sb, ino);
 523        if (!inode)
 524                return ERR_PTR(-ENOMEM);
 525        if (!(inode->i_state & I_NEW))
 526                return inode;
 527
 528        if (INODE_VERSION(inode) == MINIX_V1)
 529                return V1_minix_iget(inode);
 530        else
 531                return V2_minix_iget(inode);
 532}
 533
 534/*
 535 * The minix V1 function to synchronize an inode.
 536 */
 537static struct buffer_head * V1_minix_update_inode(struct inode * inode)
 538{
 539        struct buffer_head * bh;
 540        struct minix_inode * raw_inode;
 541        struct minix_inode_info *minix_inode = minix_i(inode);
 542        int i;
 543
 544        raw_inode = minix_V1_raw_inode(inode->i_sb, inode->i_ino, &bh);
 545        if (!raw_inode)
 546                return NULL;
 547        raw_inode->i_mode = inode->i_mode;
 548        raw_inode->i_uid = fs_high2lowuid(inode->i_uid);
 549        raw_inode->i_gid = fs_high2lowgid(inode->i_gid);
 550        raw_inode->i_nlinks = inode->i_nlink;
 551        raw_inode->i_size = inode->i_size;
 552        raw_inode->i_time = inode->i_mtime.tv_sec;
 553        if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
 554                raw_inode->i_zone[0] = old_encode_dev(inode->i_rdev);
 555        else for (i = 0; i < 9; i++)
 556                raw_inode->i_zone[i] = minix_inode->u.i1_data[i];
 557        mark_buffer_dirty(bh);
 558        return bh;
 559}
 560
 561/*
 562 * The minix V2 function to synchronize an inode.
 563 */
 564static struct buffer_head * V2_minix_update_inode(struct inode * inode)
 565{
 566        struct buffer_head * bh;
 567        struct minix2_inode * raw_inode;
 568        struct minix_inode_info *minix_inode = minix_i(inode);
 569        int i;
 570
 571        raw_inode = minix_V2_raw_inode(inode->i_sb, inode->i_ino, &bh);
 572        if (!raw_inode)
 573                return NULL;
 574        raw_inode->i_mode = inode->i_mode;
 575        raw_inode->i_uid = fs_high2lowuid(inode->i_uid);
 576        raw_inode->i_gid = fs_high2lowgid(inode->i_gid);
 577        raw_inode->i_nlinks = inode->i_nlink;
 578        raw_inode->i_size = inode->i_size;
 579        raw_inode->i_mtime = inode->i_mtime.tv_sec;
 580        raw_inode->i_atime = inode->i_atime.tv_sec;
 581        raw_inode->i_ctime = inode->i_ctime.tv_sec;
 582        if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
 583                raw_inode->i_zone[0] = old_encode_dev(inode->i_rdev);
 584        else for (i = 0; i < 10; i++)
 585                raw_inode->i_zone[i] = minix_inode->u.i2_data[i];
 586        mark_buffer_dirty(bh);
 587        return bh;
 588}
 589
 590static int minix_write_inode(struct inode *inode, struct writeback_control *wbc)
 591{
 592        int err = 0;
 593        struct buffer_head *bh;
 594
 595        if (INODE_VERSION(inode) == MINIX_V1)
 596                bh = V1_minix_update_inode(inode);
 597        else
 598                bh = V2_minix_update_inode(inode);
 599        if (!bh)
 600                return -EIO;
 601        if (wbc->sync_mode == WB_SYNC_ALL && buffer_dirty(bh)) {
 602                sync_dirty_buffer(bh);
 603                if (buffer_req(bh) && !buffer_uptodate(bh)) {
 604                        printk("IO error syncing minix inode [%s:%08lx]\n",
 605                                inode->i_sb->s_id, inode->i_ino);
 606                        err = -EIO;
 607                }
 608        }
 609        brelse (bh);
 610        return err;
 611}
 612
 613int minix_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
 614{
 615        struct super_block *sb = dentry->d_sb;
 616        generic_fillattr(dentry->d_inode, stat);
 617        if (INODE_VERSION(dentry->d_inode) == MINIX_V1)
 618                stat->blocks = (BLOCK_SIZE / 512) * V1_minix_blocks(stat->size, sb);
 619        else
 620                stat->blocks = (sb->s_blocksize / 512) * V2_minix_blocks(stat->size, sb);
 621        stat->blksize = sb->s_blocksize;
 622        return 0;
 623}
 624
 625/*
 626 * The function that is called for file truncation.
 627 */
 628void minix_truncate(struct inode * inode)
 629{
 630        if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode)))
 631                return;
 632        if (INODE_VERSION(inode) == MINIX_V1)
 633                V1_minix_truncate(inode);
 634        else
 635                V2_minix_truncate(inode);
 636}
 637
 638static struct dentry *minix_mount(struct file_system_type *fs_type,
 639        int flags, const char *dev_name, void *data)
 640{
 641        return mount_bdev(fs_type, flags, dev_name, data, minix_fill_super);
 642}
 643
 644static struct file_system_type minix_fs_type = {
 645        .owner          = THIS_MODULE,
 646        .name           = "minix",
 647        .mount          = minix_mount,
 648        .kill_sb        = kill_block_super,
 649        .fs_flags       = FS_REQUIRES_DEV,
 650};
 651
 652static int __init init_minix_fs(void)
 653{
 654        int err = init_inodecache();
 655        if (err)
 656                goto out1;
 657        err = register_filesystem(&minix_fs_type);
 658        if (err)
 659                goto out;
 660        return 0;
 661out:
 662        destroy_inodecache();
 663out1:
 664        return err;
 665}
 666
 667static void __exit exit_minix_fs(void)
 668{
 669        unregister_filesystem(&minix_fs_type);
 670        destroy_inodecache();
 671}
 672
 673module_init(init_minix_fs)
 674module_exit(exit_minix_fs)
 675MODULE_LICENSE("GPL");
 676
 677
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