linux/fs/sysv/super.c
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   1/*
   2 *  linux/fs/sysv/inode.c
   3 *
   4 *  minix/inode.c
   5 *  Copyright (C) 1991, 1992  Linus Torvalds
   6 *
   7 *  xenix/inode.c
   8 *  Copyright (C) 1992  Doug Evans
   9 *
  10 *  coh/inode.c
  11 *  Copyright (C) 1993  Pascal Haible, Bruno Haible
  12 *
  13 *  sysv/inode.c
  14 *  Copyright (C) 1993  Paul B. Monday
  15 *
  16 *  sysv/inode.c
  17 *  Copyright (C) 1993  Bruno Haible
  18 *  Copyright (C) 1997, 1998  Krzysztof G. Baranowski
  19 *
  20 *  This file contains code for read/parsing the superblock.
  21 */
  22
  23#include <linux/module.h>
  24#include <linux/init.h>
  25#include <linux/slab.h>
  26#include <linux/buffer_head.h>
  27#include "sysv.h"
  28
  29/*
  30 * The following functions try to recognize specific filesystems.
  31 *
  32 * We recognize:
  33 * - Xenix FS by its magic number.
  34 * - SystemV FS by its magic number.
  35 * - Coherent FS by its funny fname/fpack field.
  36 * - SCO AFS by s_nfree == 0xffff
  37 * - V7 FS has no distinguishing features.
  38 *
  39 * We discriminate among SystemV4 and SystemV2 FS by the assumption that
  40 * the time stamp is not < 01-01-1980.
  41 */
  42
  43enum {
  44        JAN_1_1980 = (10*365 + 2) * 24 * 60 * 60
  45};
  46
  47static void detected_xenix(struct sysv_sb_info *sbi, unsigned *max_links)
  48{
  49        struct buffer_head *bh1 = sbi->s_bh1;
  50        struct buffer_head *bh2 = sbi->s_bh2;
  51        struct xenix_super_block * sbd1;
  52        struct xenix_super_block * sbd2;
  53
  54        if (bh1 != bh2)
  55                sbd1 = sbd2 = (struct xenix_super_block *) bh1->b_data;
  56        else {
  57                /* block size = 512, so bh1 != bh2 */
  58                sbd1 = (struct xenix_super_block *) bh1->b_data;
  59                sbd2 = (struct xenix_super_block *) (bh2->b_data - 512);
  60        }
  61
  62        *max_links = XENIX_LINK_MAX;
  63        sbi->s_fic_size = XENIX_NICINOD;
  64        sbi->s_flc_size = XENIX_NICFREE;
  65        sbi->s_sbd1 = (char *)sbd1;
  66        sbi->s_sbd2 = (char *)sbd2;
  67        sbi->s_sb_fic_count = &sbd1->s_ninode;
  68        sbi->s_sb_fic_inodes = &sbd1->s_inode[0];
  69        sbi->s_sb_total_free_inodes = &sbd2->s_tinode;
  70        sbi->s_bcache_count = &sbd1->s_nfree;
  71        sbi->s_bcache = &sbd1->s_free[0];
  72        sbi->s_free_blocks = &sbd2->s_tfree;
  73        sbi->s_sb_time = &sbd2->s_time;
  74        sbi->s_firstdatazone = fs16_to_cpu(sbi, sbd1->s_isize);
  75        sbi->s_nzones = fs32_to_cpu(sbi, sbd1->s_fsize);
  76}
  77
  78static void detected_sysv4(struct sysv_sb_info *sbi, unsigned *max_links)
  79{
  80        struct sysv4_super_block * sbd;
  81        struct buffer_head *bh1 = sbi->s_bh1;
  82        struct buffer_head *bh2 = sbi->s_bh2;
  83
  84        if (bh1 == bh2)
  85                sbd = (struct sysv4_super_block *) (bh1->b_data + BLOCK_SIZE/2);
  86        else
  87                sbd = (struct sysv4_super_block *) bh2->b_data;
  88
  89        *max_links = SYSV_LINK_MAX;
  90        sbi->s_fic_size = SYSV_NICINOD;
  91        sbi->s_flc_size = SYSV_NICFREE;
  92        sbi->s_sbd1 = (char *)sbd;
  93        sbi->s_sbd2 = (char *)sbd;
  94        sbi->s_sb_fic_count = &sbd->s_ninode;
  95        sbi->s_sb_fic_inodes = &sbd->s_inode[0];
  96        sbi->s_sb_total_free_inodes = &sbd->s_tinode;
  97        sbi->s_bcache_count = &sbd->s_nfree;
  98        sbi->s_bcache = &sbd->s_free[0];
  99        sbi->s_free_blocks = &sbd->s_tfree;
 100        sbi->s_sb_time = &sbd->s_time;
 101        sbi->s_sb_state = &sbd->s_state;
 102        sbi->s_firstdatazone = fs16_to_cpu(sbi, sbd->s_isize);
 103        sbi->s_nzones = fs32_to_cpu(sbi, sbd->s_fsize);
 104}
 105
 106static void detected_sysv2(struct sysv_sb_info *sbi, unsigned *max_links)
 107{
 108        struct sysv2_super_block *sbd;
 109        struct buffer_head *bh1 = sbi->s_bh1;
 110        struct buffer_head *bh2 = sbi->s_bh2;
 111
 112        if (bh1 == bh2)
 113                sbd = (struct sysv2_super_block *) (bh1->b_data + BLOCK_SIZE/2);
 114        else
 115                sbd = (struct sysv2_super_block *) bh2->b_data;
 116
 117        *max_links = SYSV_LINK_MAX;
 118        sbi->s_fic_size = SYSV_NICINOD;
 119        sbi->s_flc_size = SYSV_NICFREE;
 120        sbi->s_sbd1 = (char *)sbd;
 121        sbi->s_sbd2 = (char *)sbd;
 122        sbi->s_sb_fic_count = &sbd->s_ninode;
 123        sbi->s_sb_fic_inodes = &sbd->s_inode[0];
 124        sbi->s_sb_total_free_inodes = &sbd->s_tinode;
 125        sbi->s_bcache_count = &sbd->s_nfree;
 126        sbi->s_bcache = &sbd->s_free[0];
 127        sbi->s_free_blocks = &sbd->s_tfree;
 128        sbi->s_sb_time = &sbd->s_time;
 129        sbi->s_sb_state = &sbd->s_state;
 130        sbi->s_firstdatazone = fs16_to_cpu(sbi, sbd->s_isize);
 131        sbi->s_nzones = fs32_to_cpu(sbi, sbd->s_fsize);
 132}
 133
 134static void detected_coherent(struct sysv_sb_info *sbi, unsigned *max_links)
 135{
 136        struct coh_super_block * sbd;
 137        struct buffer_head *bh1 = sbi->s_bh1;
 138
 139        sbd = (struct coh_super_block *) bh1->b_data;
 140
 141        *max_links = COH_LINK_MAX;
 142        sbi->s_fic_size = COH_NICINOD;
 143        sbi->s_flc_size = COH_NICFREE;
 144        sbi->s_sbd1 = (char *)sbd;
 145        sbi->s_sbd2 = (char *)sbd;
 146        sbi->s_sb_fic_count = &sbd->s_ninode;
 147        sbi->s_sb_fic_inodes = &sbd->s_inode[0];
 148        sbi->s_sb_total_free_inodes = &sbd->s_tinode;
 149        sbi->s_bcache_count = &sbd->s_nfree;
 150        sbi->s_bcache = &sbd->s_free[0];
 151        sbi->s_free_blocks = &sbd->s_tfree;
 152        sbi->s_sb_time = &sbd->s_time;
 153        sbi->s_firstdatazone = fs16_to_cpu(sbi, sbd->s_isize);
 154        sbi->s_nzones = fs32_to_cpu(sbi, sbd->s_fsize);
 155}
 156
 157static void detected_v7(struct sysv_sb_info *sbi, unsigned *max_links)
 158{
 159        struct buffer_head *bh2 = sbi->s_bh2;
 160        struct v7_super_block *sbd = (struct v7_super_block *)bh2->b_data;
 161
 162        *max_links = V7_LINK_MAX;
 163        sbi->s_fic_size = V7_NICINOD;
 164        sbi->s_flc_size = V7_NICFREE;
 165        sbi->s_sbd1 = (char *)sbd;
 166        sbi->s_sbd2 = (char *)sbd;
 167        sbi->s_sb_fic_count = &sbd->s_ninode;
 168        sbi->s_sb_fic_inodes = &sbd->s_inode[0];
 169        sbi->s_sb_total_free_inodes = &sbd->s_tinode;
 170        sbi->s_bcache_count = &sbd->s_nfree;
 171        sbi->s_bcache = &sbd->s_free[0];
 172        sbi->s_free_blocks = &sbd->s_tfree;
 173        sbi->s_sb_time = &sbd->s_time;
 174        sbi->s_firstdatazone = fs16_to_cpu(sbi, sbd->s_isize);
 175        sbi->s_nzones = fs32_to_cpu(sbi, sbd->s_fsize);
 176}
 177
 178static int detect_xenix(struct sysv_sb_info *sbi, struct buffer_head *bh)
 179{
 180        struct xenix_super_block *sbd = (struct xenix_super_block *)bh->b_data;
 181        if (*(__le32 *)&sbd->s_magic == cpu_to_le32(0x2b5544))
 182                sbi->s_bytesex = BYTESEX_LE;
 183        else if (*(__be32 *)&sbd->s_magic == cpu_to_be32(0x2b5544))
 184                sbi->s_bytesex = BYTESEX_BE;
 185        else
 186                return 0;
 187        switch (fs32_to_cpu(sbi, sbd->s_type)) {
 188        case 1:
 189                sbi->s_type = FSTYPE_XENIX;
 190                return 1;
 191        case 2:
 192                sbi->s_type = FSTYPE_XENIX;
 193                return 2;
 194        default:
 195                return 0;
 196        }
 197}
 198
 199static int detect_sysv(struct sysv_sb_info *sbi, struct buffer_head *bh)
 200{
 201        struct super_block *sb = sbi->s_sb;
 202        /* All relevant fields are at the same offsets in R2 and R4 */
 203        struct sysv4_super_block * sbd;
 204        u32 type;
 205
 206        sbd = (struct sysv4_super_block *) (bh->b_data + BLOCK_SIZE/2);
 207        if (*(__le32 *)&sbd->s_magic == cpu_to_le32(0xfd187e20))
 208                sbi->s_bytesex = BYTESEX_LE;
 209        else if (*(__be32 *)&sbd->s_magic == cpu_to_be32(0xfd187e20))
 210                sbi->s_bytesex = BYTESEX_BE;
 211        else
 212                return 0;
 213
 214        type = fs32_to_cpu(sbi, sbd->s_type);
 215 
 216        if (fs16_to_cpu(sbi, sbd->s_nfree) == 0xffff) {
 217                sbi->s_type = FSTYPE_AFS;
 218                sbi->s_forced_ro = 1;
 219                if (!(sb->s_flags & MS_RDONLY)) {
 220                        printk("SysV FS: SCO EAFS on %s detected, " 
 221                                "forcing read-only mode.\n", 
 222                                sb->s_id);
 223                }
 224                return type;
 225        }
 226 
 227        if (fs32_to_cpu(sbi, sbd->s_time) < JAN_1_1980) {
 228                /* this is likely to happen on SystemV2 FS */
 229                if (type > 3 || type < 1)
 230                        return 0;
 231                sbi->s_type = FSTYPE_SYSV2;
 232                return type;
 233        }
 234        if ((type > 3 || type < 1) && (type > 0x30 || type < 0x10))
 235                return 0;
 236
 237        /* On Interactive Unix (ISC) Version 4.0/3.x s_type field = 0x10,
 238           0x20 or 0x30 indicates that symbolic links and the 14-character
 239           filename limit is gone. Due to lack of information about this
 240           feature read-only mode seems to be a reasonable approach... -KGB */
 241
 242        if (type >= 0x10) {
 243                printk("SysV FS: can't handle long file names on %s, "
 244                       "forcing read-only mode.\n", sb->s_id);
 245                sbi->s_forced_ro = 1;
 246        }
 247
 248        sbi->s_type = FSTYPE_SYSV4;
 249        return type >= 0x10 ? type >> 4 : type;
 250}
 251
 252static int detect_coherent(struct sysv_sb_info *sbi, struct buffer_head *bh)
 253{
 254        struct coh_super_block * sbd;
 255
 256        sbd = (struct coh_super_block *) (bh->b_data + BLOCK_SIZE/2);
 257        if ((memcmp(sbd->s_fname,"noname",6) && memcmp(sbd->s_fname,"xxxxx ",6))
 258            || (memcmp(sbd->s_fpack,"nopack",6) && memcmp(sbd->s_fpack,"xxxxx\n",6)))
 259                return 0;
 260        sbi->s_bytesex = BYTESEX_PDP;
 261        sbi->s_type = FSTYPE_COH;
 262        return 1;
 263}
 264
 265static int detect_sysv_odd(struct sysv_sb_info *sbi, struct buffer_head *bh)
 266{
 267        int size = detect_sysv(sbi, bh);
 268
 269        return size>2 ? 0 : size;
 270}
 271
 272static struct {
 273        int block;
 274        int (*test)(struct sysv_sb_info *, struct buffer_head *);
 275} flavours[] = {
 276        {1, detect_xenix},
 277        {0, detect_sysv},
 278        {0, detect_coherent},
 279        {9, detect_sysv_odd},
 280        {15,detect_sysv_odd},
 281        {18,detect_sysv},
 282};
 283
 284static char *flavour_names[] = {
 285        [FSTYPE_XENIX]  = "Xenix",
 286        [FSTYPE_SYSV4]  = "SystemV",
 287        [FSTYPE_SYSV2]  = "SystemV Release 2",
 288        [FSTYPE_COH]    = "Coherent",
 289        [FSTYPE_V7]     = "V7",
 290        [FSTYPE_AFS]    = "AFS",
 291};
 292
 293static void (*flavour_setup[])(struct sysv_sb_info *, unsigned *) = {
 294        [FSTYPE_XENIX]  = detected_xenix,
 295        [FSTYPE_SYSV4]  = detected_sysv4,
 296        [FSTYPE_SYSV2]  = detected_sysv2,
 297        [FSTYPE_COH]    = detected_coherent,
 298        [FSTYPE_V7]     = detected_v7,
 299        [FSTYPE_AFS]    = detected_sysv4,
 300};
 301
 302static int complete_read_super(struct super_block *sb, int silent, int size)
 303{
 304        struct sysv_sb_info *sbi = SYSV_SB(sb);
 305        struct inode *root_inode;
 306        char *found = flavour_names[sbi->s_type];
 307        u_char n_bits = size+8;
 308        int bsize = 1 << n_bits;
 309        int bsize_4 = bsize >> 2;
 310
 311        sbi->s_firstinodezone = 2;
 312
 313        flavour_setup[sbi->s_type](sbi, &sb->s_max_links);
 314        
 315        sbi->s_truncate = 1;
 316        sbi->s_ndatazones = sbi->s_nzones - sbi->s_firstdatazone;
 317        sbi->s_inodes_per_block = bsize >> 6;
 318        sbi->s_inodes_per_block_1 = (bsize >> 6)-1;
 319        sbi->s_inodes_per_block_bits = n_bits-6;
 320        sbi->s_ind_per_block = bsize_4;
 321        sbi->s_ind_per_block_2 = bsize_4*bsize_4;
 322        sbi->s_toobig_block = 10 + bsize_4 * (1 + bsize_4 * (1 + bsize_4));
 323        sbi->s_ind_per_block_bits = n_bits-2;
 324
 325        sbi->s_ninodes = (sbi->s_firstdatazone - sbi->s_firstinodezone)
 326                << sbi->s_inodes_per_block_bits;
 327
 328        if (!silent)
 329                printk("VFS: Found a %s FS (block size = %ld) on device %s\n",
 330                       found, sb->s_blocksize, sb->s_id);
 331
 332        sb->s_magic = SYSV_MAGIC_BASE + sbi->s_type;
 333        /* set up enough so that it can read an inode */
 334        sb->s_op = &sysv_sops;
 335        if (sbi->s_forced_ro)
 336                sb->s_flags |= MS_RDONLY;
 337        if (sbi->s_truncate)
 338                sb->s_d_op = &sysv_dentry_operations;
 339        root_inode = sysv_iget(sb, SYSV_ROOT_INO);
 340        if (IS_ERR(root_inode)) {
 341                printk("SysV FS: get root inode failed\n");
 342                return 0;
 343        }
 344        sb->s_root = d_make_root(root_inode);
 345        if (!sb->s_root) {
 346                printk("SysV FS: get root dentry failed\n");
 347                return 0;
 348        }
 349        return 1;
 350}
 351
 352static int sysv_fill_super(struct super_block *sb, void *data, int silent)
 353{
 354        struct buffer_head *bh1, *bh = NULL;
 355        struct sysv_sb_info *sbi;
 356        unsigned long blocknr;
 357        int size = 0, i;
 358        
 359        BUILD_BUG_ON(1024 != sizeof (struct xenix_super_block));
 360        BUILD_BUG_ON(512 != sizeof (struct sysv4_super_block));
 361        BUILD_BUG_ON(512 != sizeof (struct sysv2_super_block));
 362        BUILD_BUG_ON(500 != sizeof (struct coh_super_block));
 363        BUILD_BUG_ON(64 != sizeof (struct sysv_inode));
 364
 365        sbi = kzalloc(sizeof(struct sysv_sb_info), GFP_KERNEL);
 366        if (!sbi)
 367                return -ENOMEM;
 368
 369        sbi->s_sb = sb;
 370        sbi->s_block_base = 0;
 371        mutex_init(&sbi->s_lock);
 372        sb->s_fs_info = sbi;
 373
 374        sb_set_blocksize(sb, BLOCK_SIZE);
 375
 376        for (i = 0; i < ARRAY_SIZE(flavours) && !size; i++) {
 377                brelse(bh);
 378                bh = sb_bread(sb, flavours[i].block);
 379                if (!bh)
 380                        continue;
 381                size = flavours[i].test(SYSV_SB(sb), bh);
 382        }
 383
 384        if (!size)
 385                goto Eunknown;
 386
 387        switch (size) {
 388                case 1:
 389                        blocknr = bh->b_blocknr << 1;
 390                        brelse(bh);
 391                        sb_set_blocksize(sb, 512);
 392                        bh1 = sb_bread(sb, blocknr);
 393                        bh = sb_bread(sb, blocknr + 1);
 394                        break;
 395                case 2:
 396                        bh1 = bh;
 397                        break;
 398                case 3:
 399                        blocknr = bh->b_blocknr >> 1;
 400                        brelse(bh);
 401                        sb_set_blocksize(sb, 2048);
 402                        bh1 = bh = sb_bread(sb, blocknr);
 403                        break;
 404                default:
 405                        goto Ebadsize;
 406        }
 407
 408        if (bh && bh1) {
 409                sbi->s_bh1 = bh1;
 410                sbi->s_bh2 = bh;
 411                if (complete_read_super(sb, silent, size))
 412                        return 0;
 413        }
 414
 415        brelse(bh1);
 416        brelse(bh);
 417        sb_set_blocksize(sb, BLOCK_SIZE);
 418        printk("oldfs: cannot read superblock\n");
 419failed:
 420        kfree(sbi);
 421        return -EINVAL;
 422
 423Eunknown:
 424        brelse(bh);
 425        if (!silent)
 426                printk("VFS: unable to find oldfs superblock on device %s\n",
 427                        sb->s_id);
 428        goto failed;
 429Ebadsize:
 430        brelse(bh);
 431        if (!silent)
 432                printk("VFS: oldfs: unsupported block size (%dKb)\n",
 433                        1<<(size-2));
 434        goto failed;
 435}
 436
 437static int v7_sanity_check(struct super_block *sb, struct buffer_head *bh)
 438{
 439        struct v7_super_block *v7sb;
 440        struct sysv_inode *v7i;
 441        struct buffer_head *bh2;
 442        struct sysv_sb_info *sbi;
 443
 444        sbi = sb->s_fs_info;
 445
 446        /* plausibility check on superblock */
 447        v7sb = (struct v7_super_block *) bh->b_data;
 448        if (fs16_to_cpu(sbi, v7sb->s_nfree) > V7_NICFREE ||
 449            fs16_to_cpu(sbi, v7sb->s_ninode) > V7_NICINOD ||
 450            fs32_to_cpu(sbi, v7sb->s_fsize) > V7_MAXSIZE)
 451                return 0;
 452
 453        /* plausibility check on root inode: it is a directory,
 454           with a nonzero size that is a multiple of 16 */
 455        bh2 = sb_bread(sb, 2);
 456        if (bh2 == NULL)
 457                return 0;
 458
 459        v7i = (struct sysv_inode *)(bh2->b_data + 64);
 460        if ((fs16_to_cpu(sbi, v7i->i_mode) & ~0777) != S_IFDIR ||
 461            (fs32_to_cpu(sbi, v7i->i_size) == 0) ||
 462            (fs32_to_cpu(sbi, v7i->i_size) & 017) ||
 463            (fs32_to_cpu(sbi, v7i->i_size) > V7_NFILES *
 464             sizeof(struct sysv_dir_entry))) {
 465                brelse(bh2);
 466                return 0;
 467        }
 468
 469        brelse(bh2);
 470        return 1;
 471}
 472
 473static int v7_fill_super(struct super_block *sb, void *data, int silent)
 474{
 475        struct sysv_sb_info *sbi;
 476        struct buffer_head *bh;
 477
 478        if (440 != sizeof (struct v7_super_block))
 479                panic("V7 FS: bad super-block size");
 480        if (64 != sizeof (struct sysv_inode))
 481                panic("sysv fs: bad i-node size");
 482
 483        sbi = kzalloc(sizeof(struct sysv_sb_info), GFP_KERNEL);
 484        if (!sbi)
 485                return -ENOMEM;
 486
 487        sbi->s_sb = sb;
 488        sbi->s_block_base = 0;
 489        sbi->s_type = FSTYPE_V7;
 490        sb->s_fs_info = sbi;
 491        
 492        sb_set_blocksize(sb, 512);
 493
 494        if ((bh = sb_bread(sb, 1)) == NULL) {
 495                if (!silent)
 496                        printk("VFS: unable to read V7 FS superblock on "
 497                               "device %s.\n", sb->s_id);
 498                goto failed;
 499        }
 500
 501        /* Try PDP-11 UNIX */
 502        sbi->s_bytesex = BYTESEX_PDP;
 503        if (v7_sanity_check(sb, bh))
 504                goto detected;
 505
 506        /* Try PC/IX, v7/x86 */
 507        sbi->s_bytesex = BYTESEX_LE;
 508        if (v7_sanity_check(sb, bh))
 509                goto detected;
 510
 511        goto failed;
 512
 513detected:
 514        sbi->s_bh1 = bh;
 515        sbi->s_bh2 = bh;
 516        if (complete_read_super(sb, silent, 1))
 517                return 0;
 518
 519failed:
 520        printk(KERN_ERR "VFS: could not find a valid V7 on %s.\n",
 521                sb->s_id);
 522        brelse(bh);
 523        kfree(sbi);
 524        return -EINVAL;
 525}
 526
 527/* Every kernel module contains stuff like this. */
 528
 529static struct dentry *sysv_mount(struct file_system_type *fs_type,
 530        int flags, const char *dev_name, void *data)
 531{
 532        return mount_bdev(fs_type, flags, dev_name, data, sysv_fill_super);
 533}
 534
 535static struct dentry *v7_mount(struct file_system_type *fs_type,
 536        int flags, const char *dev_name, void *data)
 537{
 538        return mount_bdev(fs_type, flags, dev_name, data, v7_fill_super);
 539}
 540
 541static struct file_system_type sysv_fs_type = {
 542        .owner          = THIS_MODULE,
 543        .name           = "sysv",
 544        .mount          = sysv_mount,
 545        .kill_sb        = kill_block_super,
 546        .fs_flags       = FS_REQUIRES_DEV,
 547};
 548
 549static struct file_system_type v7_fs_type = {
 550        .owner          = THIS_MODULE,
 551        .name           = "v7",
 552        .mount          = v7_mount,
 553        .kill_sb        = kill_block_super,
 554        .fs_flags       = FS_REQUIRES_DEV,
 555};
 556
 557static int __init init_sysv_fs(void)
 558{
 559        int error;
 560
 561        error = sysv_init_icache();
 562        if (error)
 563                goto out;
 564        error = register_filesystem(&sysv_fs_type);
 565        if (error)
 566                goto destroy_icache;
 567        error = register_filesystem(&v7_fs_type);
 568        if (error)
 569                goto unregister;
 570        return 0;
 571
 572unregister:
 573        unregister_filesystem(&sysv_fs_type);
 574destroy_icache:
 575        sysv_destroy_icache();
 576out:
 577        return error;
 578}
 579
 580static void __exit exit_sysv_fs(void)
 581{
 582        unregister_filesystem(&sysv_fs_type);
 583        unregister_filesystem(&v7_fs_type);
 584        sysv_destroy_icache();
 585}
 586
 587module_init(init_sysv_fs)
 588module_exit(exit_sysv_fs)
 589MODULE_ALIAS("v7");
 590MODULE_LICENSE("GPL");
 591
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