super.c

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/*
 *  linux/fs/hpfs/super.c
 *
 *  Mikulas Patocka ([email protected]), 1998-1999
 *
 *  mounting, unmounting, error handling
 */

#include "hpfs_fn.h"
#include <linux/module.h>
#include <linux/parser.h>
#include <linux/init.h>
#include <linux/statfs.h>
#include <linux/magic.h>
#include <linux/sched.h>
#include <linux/bitmap.h>
#include <linux/slab.h>

/* Mark the filesystem dirty, so that chkdsk checks it when os/2 booted */

static void mark_dirty(struct super_block *s, int remount)
{
    if (hpfs_sb(s)->sb_chkdsk && (remount || !(s->s_flags & MS_RDONLY))) {
        struct buffer_head *bh;
        struct hpfs_spare_block *sb;
        if ((sb = hpfs_map_sector(s, 17, &bh, 0))) {
            sb->dirty = 1;
            sb->old_wrote = 0;
            mark_buffer_dirty(bh);
            sync_dirty_buffer(bh);
            brelse(bh);
        }
    }
}

/* Mark the filesystem clean (mark it dirty for chkdsk if chkdsk==2 or if there
   were errors) */

static void unmark_dirty(struct super_block *s)
{
    struct buffer_head *bh;
    struct hpfs_spare_block *sb;
    if (s->s_flags & MS_RDONLY) return;
    sync_blockdev(s->s_bdev);
    if ((sb = hpfs_map_sector(s, 17, &bh, 0))) {
        sb->dirty = hpfs_sb(s)->sb_chkdsk > 1 - hpfs_sb(s)->sb_was_error;
        sb->old_wrote = hpfs_sb(s)->sb_chkdsk >= 2 && !hpfs_sb(s)->sb_was_error;
        mark_buffer_dirty(bh);
        sync_dirty_buffer(bh);
        brelse(bh);
    }
}

/* Filesystem error... */
static char err_buf[1024];

void hpfs_error(struct super_block *s, const char *fmt, ...)
{
    va_list args;

    va_start(args, fmt);
    vsnprintf(err_buf, sizeof(err_buf), fmt, args);
    va_end(args);

    printk("HPFS: filesystem error: %s", err_buf);
    if (!hpfs_sb(s)->sb_was_error) {
        if (hpfs_sb(s)->sb_err == 2) {
            printk("; crashing the system because you wanted it\n");
            mark_dirty(s, 0);
            panic("HPFS panic");
        } else if (hpfs_sb(s)->sb_err == 1) {
            if (s->s_flags & MS_RDONLY) printk("; already mounted read-only\n");
            else {
                printk("; remounting read-only\n");
                mark_dirty(s, 0);
                s->s_flags |= MS_RDONLY;
            }
        } else if (s->s_flags & MS_RDONLY) printk("; going on - but anything won't be destroyed because it's read-only\n");
        else printk("; corrupted filesystem mounted read/write - your computer will explode within 20 seconds ... but you wanted it so!\n");
    } else printk("\n");
    hpfs_sb(s)->sb_was_error = 1;
}

/* 
 * A little trick to detect cycles in many hpfs structures and don't let the
 * kernel crash on corrupted filesystem. When first called, set c2 to 0.
 *
 * BTW. chkdsk doesn't detect cycles correctly. When I had 2 lost directories
 * nested each in other, chkdsk locked up happilly.
 */

int hpfs_stop_cycles(struct super_block *s, int key, int *c1, int *c2,
        char *msg)
{
    if (*c2 && *c1 == key) {
        hpfs_error(s, "cycle detected on key %08x in %s", key, msg);
        return 1;
    }
    (*c2)++;
    if (!((*c2 - 1) & *c2)) *c1 = key;
    return 0;
}

static void hpfs_put_super(struct super_block *s)
{
    struct hpfs_sb_info *sbi = hpfs_sb(s);

    hpfs_lock(s);
    unmark_dirty(s);
    hpfs_unlock(s);

    kfree(sbi->sb_cp_table);
    kfree(sbi->sb_bmp_dir);
    s->s_fs_info = NULL;
    kfree(sbi);
}

unsigned hpfs_count_one_bitmap(struct super_block *s, secno secno)
{
    struct quad_buffer_head qbh;
    unsigned long *bits;
    unsigned count;

    bits = hpfs_map_4sectors(s, secno, &qbh, 4);
    if (!bits)
        return 0;
    count = bitmap_weight(bits, 2048 * BITS_PER_BYTE);
    hpfs_brelse4(&qbh);
    return count;
}

static unsigned count_bitmaps(struct super_block *s)
{
    unsigned n, count, n_bands;
    n_bands = (hpfs_sb(s)->sb_fs_size + 0x3fff) >> 14;
    count = 0;
    for (n = 0; n < n_bands; n++)
        count += hpfs_count_one_bitmap(s, le32_to_cpu(hpfs_sb(s)->sb_bmp_dir[n]));
    return count;
}

static int hpfs_statfs(struct dentry *dentry, struct kstatfs *buf)
{
    struct super_block *s = dentry->d_sb;
    struct hpfs_sb_info *sbi = hpfs_sb(s);
    u64 id = huge_encode_dev(s->s_bdev->bd_dev);
    hpfs_lock(s);

    /*if (sbi->sb_n_free == -1) {*/
        sbi->sb_n_free = count_bitmaps(s);
        sbi->sb_n_free_dnodes = hpfs_count_one_bitmap(s, sbi->sb_dmap);
    /*}*/
    buf->f_type = s->s_magic;
    buf->f_bsize = 512;
    buf->f_blocks = sbi->sb_fs_size;
    buf->f_bfree = sbi->sb_n_free;
    buf->f_bavail = sbi->sb_n_free;
    buf->f_files = sbi->sb_dirband_size / 4;
    buf->f_ffree = sbi->sb_n_free_dnodes;
    buf->f_fsid.val[0] = (u32)id;
    buf->f_fsid.val[1] = (u32)(id >> 32);
    buf->f_namelen = 254;

    hpfs_unlock(s);

    return 0;
}

static struct kmem_cache * hpfs_inode_cachep;

static struct inode *hpfs_alloc_inode(struct super_block *sb)
{
    struct hpfs_inode_info *ei;
    ei = (struct hpfs_inode_info *)kmem_cache_alloc(hpfs_inode_cachep, GFP_NOFS);
    if (!ei)
        return NULL;
    ei->vfs_inode.i_version = 1;
    return &ei->vfs_inode;
}

static void hpfs_i_callback(struct rcu_head *head)
{
    struct inode *inode = container_of(head, struct inode, i_rcu);
    kmem_cache_free(hpfs_inode_cachep, hpfs_i(inode));
}

static void hpfs_destroy_inode(struct inode *inode)
{
    call_rcu(&inode->i_rcu, hpfs_i_callback);
}

static void init_once(void *foo)
{
    struct hpfs_inode_info *ei = (struct hpfs_inode_info *) foo;

    inode_init_once(&ei->vfs_inode);
}

static int init_inodecache(void)
{
    hpfs_inode_cachep = kmem_cache_create("hpfs_inode_cache",
                         sizeof(struct hpfs_inode_info),
                         0, (SLAB_RECLAIM_ACCOUNT|
                        SLAB_MEM_SPREAD),
                         init_once);
    if (hpfs_inode_cachep == NULL)
        return -ENOMEM;
    return 0;
}

static void destroy_inodecache(void)
{
    /*
     * Make sure all delayed rcu free inodes are flushed before we
     * destroy cache.
     */
    rcu_barrier();
    kmem_cache_destroy(hpfs_inode_cachep);
}

/*
 * A tiny parser for option strings, stolen from dosfs.
 * Stolen again from read-only hpfs.
 * And updated for table-driven option parsing.
 */

enum {
    Opt_help, Opt_uid, Opt_gid, Opt_umask, Opt_case_lower, Opt_case_asis,
    Opt_check_none, Opt_check_normal, Opt_check_strict,
    Opt_err_cont, Opt_err_ro, Opt_err_panic,
    Opt_eas_no, Opt_eas_ro, Opt_eas_rw,
    Opt_chkdsk_no, Opt_chkdsk_errors, Opt_chkdsk_always,
    Opt_timeshift, Opt_err,
};

static const match_table_t tokens = {
    {Opt_help, "help"},
    {Opt_uid, "uid=%u"},
    {Opt_gid, "gid=%u"},
    {Opt_umask, "umask=%o"},
    {Opt_case_lower, "case=lower"},
    {Opt_case_asis, "case=asis"},
    {Opt_check_none, "check=none"},
    {Opt_check_normal, "check=normal"},
    {Opt_check_strict, "check=strict"},
    {Opt_err_cont, "errors=continue"},
    {Opt_err_ro, "errors=remount-ro"},
    {Opt_err_panic, "errors=panic"},
    {Opt_eas_no, "eas=no"},
    {Opt_eas_ro, "eas=ro"},
    {Opt_eas_rw, "eas=rw"},
    {Opt_chkdsk_no, "chkdsk=no"},
    {Opt_chkdsk_errors, "chkdsk=errors"},
    {Opt_chkdsk_always, "chkdsk=always"},
    {Opt_timeshift, "timeshift=%d"},
    {Opt_err, NULL},
};

static int parse_opts(char *opts, kuid_t *uid, kgid_t *gid, umode_t *umask,
              int *lowercase, int *eas, int *chk, int *errs,
              int *chkdsk, int *timeshift)
{
    char *p;
    int option;

    if (!opts)
        return 1;

    /*printk("Parsing opts: '%s'\n",opts);*/

    while ((p = strsep(&opts, ",")) != NULL) {
        substring_t args[MAX_OPT_ARGS];
        int token;
        if (!*p)
            continue;

        token = match_token(p, tokens, args);
        switch (token) {
        case Opt_help:
            return 2;
        case Opt_uid:
            if (match_int(args, &option))
                return 0;
            *uid = make_kuid(current_user_ns(), option);
            if (!uid_valid(*uid))
                return 0;
            break;
        case Opt_gid:
            if (match_int(args, &option))
                return 0;
            *gid = make_kgid(current_user_ns(), option);
            if (!gid_valid(*gid))
                return 0;
            break;
        case Opt_umask:
            if (match_octal(args, &option))
                return 0;
            *umask = option;
            break;
        case Opt_case_lower:
            *lowercase = 1;
            break;
        case Opt_case_asis:
            *lowercase = 0;
            break;
        case Opt_check_none:
            *chk = 0;
            break;
        case Opt_check_normal:
            *chk = 1;
            break;
        case Opt_check_strict:
            *chk = 2;
            break;
        case Opt_err_cont:
            *errs = 0;
            break;
        case Opt_err_ro:
            *errs = 1;
            break;
        case Opt_err_panic:
            *errs = 2;
            break;
        case Opt_eas_no:
            *eas = 0;
            break;
        case Opt_eas_ro:
            *eas = 1;
            break;
        case Opt_eas_rw:
            *eas = 2;
            break;
        case Opt_chkdsk_no:
            *chkdsk = 0;
            break;
        case Opt_chkdsk_errors:
            *chkdsk = 1;
            break;
        case Opt_chkdsk_always:
            *chkdsk = 2;
            break;
        case Opt_timeshift:
        {
            int m = 1;
            char *rhs = args[0].from;
            if (!rhs || !*rhs)
                return 0;
            if (*rhs == '-') m = -1;
            if (*rhs == '+' || *rhs == '-') rhs++;
            *timeshift = simple_strtoul(rhs, &rhs, 0) * m;
            if (*rhs)
                return 0;
            break;
        }
        default:
            return 0;
        }
    }
    return 1;
}

static inline void hpfs_help(void)
{
    printk("\n\
HPFS filesystem options:\n\
      help              do not mount and display this text\n\
      uid=xxx           set uid of files that don't have uid specified in eas\n\
      gid=xxx           set gid of files that don't have gid specified in eas\n\
      umask=xxx         set mode of files that don't have mode specified in eas\n\
      case=lower        lowercase all files\n\
      case=asis         do not lowercase files (default)\n\
      check=none        no fs checks - kernel may crash on corrupted filesystem\n\
      check=normal      do some checks - it should not crash (default)\n\
      check=strict      do extra time-consuming checks, used for debugging\n\
      errors=continue   continue on errors\n\
      errors=remount-ro remount read-only if errors found (default)\n\
      errors=panic      panic on errors\n\
      chkdsk=no         do not mark fs for chkdsking even if there were errors\n\
      chkdsk=errors     mark fs dirty if errors found (default)\n\
      chkdsk=always     always mark fs dirty - used for debugging\n\
      eas=no            ignore extended attributes\n\
      eas=ro            read but do not write extended attributes\n\
      eas=rw            r/w eas => enables chmod, chown, mknod, ln -s (default)\n\
      timeshift=nnn add nnn seconds to file times\n\
\n");
}

static int hpfs_remount_fs(struct super_block *s, int *flags, char *data)
{
    kuid_t uid;
    kgid_t gid;
    umode_t umask;
    int lowercase, eas, chk, errs, chkdsk, timeshift;
    int o;
    struct hpfs_sb_info *sbi = hpfs_sb(s);
    char *new_opts = kstrdup(data, GFP_KERNEL);
    
    *flags |= MS_NOATIME;
    
    hpfs_lock(s);
    uid = sbi->sb_uid; gid = sbi->sb_gid;
    umask = 0777 & ~sbi->sb_mode;
    lowercase = sbi->sb_lowercase;
    eas = sbi->sb_eas; chk = sbi->sb_chk; chkdsk = sbi->sb_chkdsk;
    errs = sbi->sb_err; timeshift = sbi->sb_timeshift;

    if (!(o = parse_opts(data, &uid, &gid, &umask, &lowercase,
        &eas, &chk, &errs, &chkdsk, &timeshift))) {
        printk("HPFS: bad mount options.\n");
        goto out_err;
    }
    if (o == 2) {
        hpfs_help();
        goto out_err;
    }
    if (timeshift != sbi->sb_timeshift) {
        printk("HPFS: timeshift can't be changed using remount.\n");
        goto out_err;
    }

    unmark_dirty(s);

    sbi->sb_uid = uid; sbi->sb_gid = gid;
    sbi->sb_mode = 0777 & ~umask;
    sbi->sb_lowercase = lowercase;
    sbi->sb_eas = eas; sbi->sb_chk = chk; sbi->sb_chkdsk = chkdsk;
    sbi->sb_err = errs; sbi->sb_timeshift = timeshift;

    if (!(*flags & MS_RDONLY)) mark_dirty(s, 1);

    replace_mount_options(s, new_opts);

    hpfs_unlock(s);
    return 0;

out_err:
    hpfs_unlock(s);
    kfree(new_opts);
    return -EINVAL;
}

/* Super operations */

static const struct super_operations hpfs_sops =
{
    .alloc_inode    = hpfs_alloc_inode,
    .destroy_inode  = hpfs_destroy_inode,
    .evict_inode    = hpfs_evict_inode,
    .put_super  = hpfs_put_super,
    .statfs     = hpfs_statfs,
    .remount_fs = hpfs_remount_fs,
    .show_options   = generic_show_options,
};

static int hpfs_fill_super(struct super_block *s, void *options, int silent)
{
    struct buffer_head *bh0, *bh1, *bh2;
    struct hpfs_boot_block *bootblock;
    struct hpfs_super_block *superblock;
    struct hpfs_spare_block *spareblock;
    struct hpfs_sb_info *sbi;
    struct inode *root;

    kuid_t uid;
    kgid_t gid;
    umode_t umask;
    int lowercase, eas, chk, errs, chkdsk, timeshift;

    dnode_secno root_dno;
    struct hpfs_dirent *de = NULL;
    struct quad_buffer_head qbh;

    int o;

    save_mount_options(s, options);

    sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
    if (!sbi) {
        return -ENOMEM;
    }
    s->s_fs_info = sbi;

    sbi->sb_bmp_dir = NULL;
    sbi->sb_cp_table = NULL;

    mutex_init(&sbi->hpfs_mutex);
    hpfs_lock(s);

    uid = current_uid();
    gid = current_gid();
    umask = current_umask();
    lowercase = 0;
    eas = 2;
    chk = 1;
    errs = 1;
    chkdsk = 1;
    timeshift = 0;

    if (!(o = parse_opts(options, &uid, &gid, &umask, &lowercase,
        &eas, &chk, &errs, &chkdsk, &timeshift))) {
        printk("HPFS: bad mount options.\n");
        goto bail0;
    }
    if (o==2) {
        hpfs_help();
        goto bail0;
    }

    /*sbi->sb_mounting = 1;*/
    sb_set_blocksize(s, 512);
    sbi->sb_fs_size = -1;
    if (!(bootblock = hpfs_map_sector(s, 0, &bh0, 0))) goto bail1;
    if (!(superblock = hpfs_map_sector(s, 16, &bh1, 1))) goto bail2;
    if (!(spareblock = hpfs_map_sector(s, 17, &bh2, 0))) goto bail3;

    /* Check magics */
    if (/*le16_to_cpu(bootblock->magic) != BB_MAGIC
        ||*/ le32_to_cpu(superblock->magic) != SB_MAGIC
        || le32_to_cpu(spareblock->magic) != SP_MAGIC) {
        if (!silent) printk("HPFS: Bad magic ... probably not HPFS\n");
        goto bail4;
    }

    /* Check version */
    if (!(s->s_flags & MS_RDONLY) &&
          superblock->funcversion != 2 && superblock->funcversion != 3) {
        printk("HPFS: Bad version %d,%d. Mount readonly to go around\n",
            (int)superblock->version, (int)superblock->funcversion);
        printk("HPFS: please try recent version of HPFS driver at http://artax.karlin.mff.cuni.cz/~mikulas/vyplody/hpfs/index-e.cgi and if it still can't understand this format, contact author - [email protected]\n");
        goto bail4;
    }

    s->s_flags |= MS_NOATIME;

    /* Fill superblock stuff */
    s->s_magic = HPFS_SUPER_MAGIC;
    s->s_op = &hpfs_sops;
    s->s_d_op = &hpfs_dentry_operations;

    sbi->sb_root = le32_to_cpu(superblock->root);
    sbi->sb_fs_size = le32_to_cpu(superblock->n_sectors);
    sbi->sb_bitmaps = le32_to_cpu(superblock->bitmaps);
    sbi->sb_dirband_start = le32_to_cpu(superblock->dir_band_start);
    sbi->sb_dirband_size = le32_to_cpu(superblock->n_dir_band);
    sbi->sb_dmap = le32_to_cpu(superblock->dir_band_bitmap);
    sbi->sb_uid = uid;
    sbi->sb_gid = gid;
    sbi->sb_mode = 0777 & ~umask;
    sbi->sb_n_free = -1;
    sbi->sb_n_free_dnodes = -1;
    sbi->sb_lowercase = lowercase;
    sbi->sb_eas = eas;
    sbi->sb_chk = chk;
    sbi->sb_chkdsk = chkdsk;
    sbi->sb_err = errs;
    sbi->sb_timeshift = timeshift;
    sbi->sb_was_error = 0;
    sbi->sb_cp_table = NULL;
    sbi->sb_c_bitmap = -1;
    sbi->sb_max_fwd_alloc = 0xffffff;
    
    /* Load bitmap directory */
    if (!(sbi->sb_bmp_dir = hpfs_load_bitmap_directory(s, le32_to_cpu(superblock->bitmaps))))
        goto bail4;
    
    /* Check for general fs errors*/
    if (spareblock->dirty && !spareblock->old_wrote) {
        if (errs == 2) {
            printk("HPFS: Improperly stopped, not mounted\n");
            goto bail4;
        }
        hpfs_error(s, "improperly stopped");
    }

    if (!(s->s_flags & MS_RDONLY)) {
        spareblock->dirty = 1;
        spareblock->old_wrote = 0;
        mark_buffer_dirty(bh2);
    }

    if (spareblock->hotfixes_used || spareblock->n_spares_used) {
        if (errs >= 2) {
            printk("HPFS: Hotfixes not supported here, try chkdsk\n");
            mark_dirty(s, 0);
            goto bail4;
        }
        hpfs_error(s, "hotfixes not supported here, try chkdsk");
        if (errs == 0) printk("HPFS: Proceeding, but your filesystem will be probably corrupted by this driver...\n");
        else printk("HPFS: This driver may read bad files or crash when operating on disk with hotfixes.\n");
    }
    if (le32_to_cpu(spareblock->n_dnode_spares) != le32_to_cpu(spareblock->n_dnode_spares_free)) {
        if (errs >= 2) {
            printk("HPFS: Spare dnodes used, try chkdsk\n");
            mark_dirty(s, 0);
            goto bail4;
        }
        hpfs_error(s, "warning: spare dnodes used, try chkdsk");
        if (errs == 0) printk("HPFS: Proceeding, but your filesystem could be corrupted if you delete files or directories\n");
    }
    if (chk) {
        unsigned a;
        if (le32_to_cpu(superblock->dir_band_end) - le32_to_cpu(superblock->dir_band_start) + 1 != le32_to_cpu(superblock->n_dir_band) ||
            le32_to_cpu(superblock->dir_band_end) < le32_to_cpu(superblock->dir_band_start) || le32_to_cpu(superblock->n_dir_band) > 0x4000) {
            hpfs_error(s, "dir band size mismatch: dir_band_start==%08x, dir_band_end==%08x, n_dir_band==%08x",
                le32_to_cpu(superblock->dir_band_start), le32_to_cpu(superblock->dir_band_end), le32_to_cpu(superblock->n_dir_band));
            goto bail4;
        }
        a = sbi->sb_dirband_size;
        sbi->sb_dirband_size = 0;
        if (hpfs_chk_sectors(s, le32_to_cpu(superblock->dir_band_start), le32_to_cpu(superblock->n_dir_band), "dir_band") ||
            hpfs_chk_sectors(s, le32_to_cpu(superblock->dir_band_bitmap), 4, "dir_band_bitmap") ||
            hpfs_chk_sectors(s, le32_to_cpu(superblock->bitmaps), 4, "bitmaps")) {
            mark_dirty(s, 0);
            goto bail4;
        }
        sbi->sb_dirband_size = a;
    } else printk("HPFS: You really don't want any checks? You are crazy...\n");

    /* Load code page table */
    if (le32_to_cpu(spareblock->n_code_pages))
        if (!(sbi->sb_cp_table = hpfs_load_code_page(s, le32_to_cpu(spareblock->code_page_dir))))
            printk("HPFS: Warning: code page support is disabled\n");

    brelse(bh2);
    brelse(bh1);
    brelse(bh0);

    root = iget_locked(s, sbi->sb_root);
    if (!root)
        goto bail0;
    hpfs_init_inode(root);
    hpfs_read_inode(root);
    unlock_new_inode(root);
    s->s_root = d_make_root(root);
    if (!s->s_root)
        goto bail0;

    /*
     * find the root directory's . pointer & finish filling in the inode
     */

    root_dno = hpfs_fnode_dno(s, sbi->sb_root);
    if (root_dno)
        de = map_dirent(root, root_dno, "\001\001", 2, NULL, &qbh);
    if (!de)
        hpfs_error(s, "unable to find root dir");
    else {
        root->i_atime.tv_sec = local_to_gmt(s, le32_to_cpu(de->read_date));
        root->i_atime.tv_nsec = 0;
        root->i_mtime.tv_sec = local_to_gmt(s, le32_to_cpu(de->write_date));
        root->i_mtime.tv_nsec = 0;
        root->i_ctime.tv_sec = local_to_gmt(s, le32_to_cpu(de->creation_date));
        root->i_ctime.tv_nsec = 0;
        hpfs_i(root)->i_ea_size = le32_to_cpu(de->ea_size);
        hpfs_i(root)->i_parent_dir = root->i_ino;
        if (root->i_size == -1)
            root->i_size = 2048;
        if (root->i_blocks == -1)
            root->i_blocks = 5;
        hpfs_brelse4(&qbh);
    }
    hpfs_unlock(s);
    return 0;

bail4:  brelse(bh2);
bail3:  brelse(bh1);
bail2:  brelse(bh0);
bail1:
bail0:
    hpfs_unlock(s);
    kfree(sbi->sb_bmp_dir);
    kfree(sbi->sb_cp_table);
    s->s_fs_info = NULL;
    kfree(sbi);
    return -EINVAL;
}

static struct dentry *hpfs_mount(struct file_system_type *fs_type,
    int flags, const char *dev_name, void *data)
{
    return mount_bdev(fs_type, flags, dev_name, data, hpfs_fill_super);
}

static struct file_system_type hpfs_fs_type = {
    .owner      = THIS_MODULE,
    .name       = "hpfs",
    .mount      = hpfs_mount,
    .kill_sb    = kill_block_super,
    .fs_flags   = FS_REQUIRES_DEV,
};

static int __init init_hpfs_fs(void)
{
    int err = init_inodecache();
    if (err)
        goto out1;
    err = register_filesystem(&hpfs_fs_type);
    if (err)
        goto out;
    return 0;
out:
    destroy_inodecache();
out1:
    return err;
}

static void __exit exit_hpfs_fs(void)
{
    unregister_filesystem(&hpfs_fs_type);
    destroy_inodecache();
}

module_init(init_hpfs_fs)
module_exit(exit_hpfs_fs)
MODULE_LICENSE("GPL");