inode.c

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/*
 *  linux/fs/isofs/inode.c
 *
 *  (C) 1991  Linus Torvalds - minix filesystem
 *      1992, 1993, 1994  Eric Youngdale Modified for ISO 9660 filesystem.
 *      1994  Eberhard Mönkeberg - multi session handling.
 *      1995  Mark Dobie - allow mounting of some weird VideoCDs and PhotoCDs.
 *  1997  Gordon Chaffee - Joliet CDs
 *  1998  Eric Lammerts - ISO 9660 Level 3
 *  2004  Paul Serice - Inode Support pushed out from 4GB to 128GB
 *  2004  Paul Serice - NFS Export Operations
 */

#include <linux/init.h>
#include <linux/module.h>

#include <linux/slab.h>
#include <linux/nls.h>
#include <linux/ctype.h>
#include <linux/statfs.h>
#include <linux/cdrom.h>
#include <linux/parser.h>
#include <linux/mpage.h>
#include <linux/user_namespace.h>

#include "isofs.h"
#include "zisofs.h"

#define BEQUIET

static int isofs_hashi(const struct dentry *parent, const struct inode *inode,
        struct qstr *qstr);
static int isofs_hash(const struct dentry *parent, const struct inode *inode,
        struct qstr *qstr);
static int isofs_dentry_cmpi(const struct dentry *parent,
        const struct inode *pinode,
        const struct dentry *dentry, const struct inode *inode,
        unsigned int len, const char *str, const struct qstr *name);
static int isofs_dentry_cmp(const struct dentry *parent,
        const struct inode *pinode,
        const struct dentry *dentry, const struct inode *inode,
        unsigned int len, const char *str, const struct qstr *name);

#ifdef CONFIG_JOLIET
static int isofs_hashi_ms(const struct dentry *parent, const struct inode *inode,
        struct qstr *qstr);
static int isofs_hash_ms(const struct dentry *parent, const struct inode *inode,
        struct qstr *qstr);
static int isofs_dentry_cmpi_ms(const struct dentry *parent,
        const struct inode *pinode,
        const struct dentry *dentry, const struct inode *inode,
        unsigned int len, const char *str, const struct qstr *name);
static int isofs_dentry_cmp_ms(const struct dentry *parent,
        const struct inode *pinode,
        const struct dentry *dentry, const struct inode *inode,
        unsigned int len, const char *str, const struct qstr *name);
#endif

static void isofs_put_super(struct super_block *sb)
{
    struct isofs_sb_info *sbi = ISOFS_SB(sb);

#ifdef CONFIG_JOLIET
    unload_nls(sbi->s_nls_iocharset);
#endif

    kfree(sbi);
    sb->s_fs_info = NULL;
    return;
}

static int isofs_read_inode(struct inode *);
static int isofs_statfs (struct dentry *, struct kstatfs *);

static struct kmem_cache *isofs_inode_cachep;

static struct inode *isofs_alloc_inode(struct super_block *sb)
{
    struct iso_inode_info *ei;
    ei = kmem_cache_alloc(isofs_inode_cachep, GFP_KERNEL);
    if (!ei)
        return NULL;
    return &ei->vfs_inode;
}

static void isofs_i_callback(struct rcu_head *head)
{
    struct inode *inode = container_of(head, struct inode, i_rcu);
    kmem_cache_free(isofs_inode_cachep, ISOFS_I(inode));
}

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

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

    inode_init_once(&ei->vfs_inode);
}

static int init_inodecache(void)
{
    isofs_inode_cachep = kmem_cache_create("isofs_inode_cache",
                    sizeof(struct iso_inode_info),
                    0, (SLAB_RECLAIM_ACCOUNT|
                    SLAB_MEM_SPREAD),
                    init_once);
    if (isofs_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(isofs_inode_cachep);
}

static int isofs_remount(struct super_block *sb, int *flags, char *data)
{
    /* we probably want a lot more here */
    *flags |= MS_RDONLY;
    return 0;
}

static const struct super_operations isofs_sops = {
    .alloc_inode    = isofs_alloc_inode,
    .destroy_inode  = isofs_destroy_inode,
    .put_super  = isofs_put_super,
    .statfs     = isofs_statfs,
    .remount_fs = isofs_remount,
    .show_options   = generic_show_options,
};


static const struct dentry_operations isofs_dentry_ops[] = {
    {
        .d_hash     = isofs_hash,
        .d_compare  = isofs_dentry_cmp,
    },
    {
        .d_hash     = isofs_hashi,
        .d_compare  = isofs_dentry_cmpi,
    },
#ifdef CONFIG_JOLIET
    {
        .d_hash     = isofs_hash_ms,
        .d_compare  = isofs_dentry_cmp_ms,
    },
    {
        .d_hash     = isofs_hashi_ms,
        .d_compare  = isofs_dentry_cmpi_ms,
    },
#endif
};

struct iso9660_options{
    unsigned int rock:1;
    unsigned int joliet:1;
    unsigned int cruft:1;
    unsigned int hide:1;
    unsigned int showassoc:1;
    unsigned int nocompress:1;
    unsigned int overriderockperm:1;
    unsigned int uid_set:1;
    unsigned int gid_set:1;
    unsigned int utf8:1;
    unsigned char map;
    unsigned char check;
    unsigned int blocksize;
    umode_t fmode;
    umode_t dmode;
    kgid_t gid;
    kuid_t uid;
    char *iocharset;
    /* LVE */
    s32 session;
    s32 sbsector;
};

/*
 * Compute the hash for the isofs name corresponding to the dentry.
 */
static int
isofs_hash_common(const struct dentry *dentry, struct qstr *qstr, int ms)
{
    const char *name;
    int len;

    len = qstr->len;
    name = qstr->name;
    if (ms) {
        while (len && name[len-1] == '.')
            len--;
    }

    qstr->hash = full_name_hash(name, len);

    return 0;
}

/*
 * Compute the hash for the isofs name corresponding to the dentry.
 */
static int
isofs_hashi_common(const struct dentry *dentry, struct qstr *qstr, int ms)
{
    const char *name;
    int len;
    char c;
    unsigned long hash;

    len = qstr->len;
    name = qstr->name;
    if (ms) {
        while (len && name[len-1] == '.')
            len--;
    }

    hash = init_name_hash();
    while (len--) {
        c = tolower(*name++);
        hash = partial_name_hash(c, hash);
    }
    qstr->hash = end_name_hash(hash);

    return 0;
}

/*
 * Compare of two isofs names.
 */
static int isofs_dentry_cmp_common(
        unsigned int len, const char *str,
        const struct qstr *name, int ms, int ci)
{
    int alen, blen;

    /* A filename cannot end in '.' or we treat it like it has none */
    alen = name->len;
    blen = len;
    if (ms) {
        while (alen && name->name[alen-1] == '.')
            alen--;
        while (blen && str[blen-1] == '.')
            blen--;
    }
    if (alen == blen) {
        if (ci) {
            if (strnicmp(name->name, str, alen) == 0)
                return 0;
        } else {
            if (strncmp(name->name, str, alen) == 0)
                return 0;
        }
    }
    return 1;
}

static int
isofs_hash(const struct dentry *dentry, const struct inode *inode,
        struct qstr *qstr)
{
    return isofs_hash_common(dentry, qstr, 0);
}

static int
isofs_hashi(const struct dentry *dentry, const struct inode *inode,
        struct qstr *qstr)
{
    return isofs_hashi_common(dentry, qstr, 0);
}

static int
isofs_dentry_cmp(const struct dentry *parent, const struct inode *pinode,
        const struct dentry *dentry, const struct inode *inode,
        unsigned int len, const char *str, const struct qstr *name)
{
    return isofs_dentry_cmp_common(len, str, name, 0, 0);
}

static int
isofs_dentry_cmpi(const struct dentry *parent, const struct inode *pinode,
        const struct dentry *dentry, const struct inode *inode,
        unsigned int len, const char *str, const struct qstr *name)
{
    return isofs_dentry_cmp_common(len, str, name, 0, 1);
}

#ifdef CONFIG_JOLIET
static int
isofs_hash_ms(const struct dentry *dentry, const struct inode *inode,
        struct qstr *qstr)
{
    return isofs_hash_common(dentry, qstr, 1);
}

static int
isofs_hashi_ms(const struct dentry *dentry, const struct inode *inode,
        struct qstr *qstr)
{
    return isofs_hashi_common(dentry, qstr, 1);
}

static int
isofs_dentry_cmp_ms(const struct dentry *parent, const struct inode *pinode,
        const struct dentry *dentry, const struct inode *inode,
        unsigned int len, const char *str, const struct qstr *name)
{
    return isofs_dentry_cmp_common(len, str, name, 1, 0);
}

static int
isofs_dentry_cmpi_ms(const struct dentry *parent, const struct inode *pinode,
        const struct dentry *dentry, const struct inode *inode,
        unsigned int len, const char *str, const struct qstr *name)
{
    return isofs_dentry_cmp_common(len, str, name, 1, 1);
}
#endif

enum {
    Opt_block, Opt_check_r, Opt_check_s, Opt_cruft, Opt_gid, Opt_ignore,
    Opt_iocharset, Opt_map_a, Opt_map_n, Opt_map_o, Opt_mode, Opt_nojoliet,
    Opt_norock, Opt_sb, Opt_session, Opt_uid, Opt_unhide, Opt_utf8, Opt_err,
    Opt_nocompress, Opt_hide, Opt_showassoc, Opt_dmode, Opt_overriderockperm,
};

static const match_table_t tokens = {
    {Opt_norock, "norock"},
    {Opt_nojoliet, "nojoliet"},
    {Opt_unhide, "unhide"},
    {Opt_hide, "hide"},
    {Opt_showassoc, "showassoc"},
    {Opt_cruft, "cruft"},
    {Opt_utf8, "utf8"},
    {Opt_iocharset, "iocharset=%s"},
    {Opt_map_a, "map=acorn"},
    {Opt_map_a, "map=a"},
    {Opt_map_n, "map=normal"},
    {Opt_map_n, "map=n"},
    {Opt_map_o, "map=off"},
    {Opt_map_o, "map=o"},
    {Opt_session, "session=%u"},
    {Opt_sb, "sbsector=%u"},
    {Opt_check_r, "check=relaxed"},
    {Opt_check_r, "check=r"},
    {Opt_check_s, "check=strict"},
    {Opt_check_s, "check=s"},
    {Opt_uid, "uid=%u"},
    {Opt_gid, "gid=%u"},
    {Opt_mode, "mode=%u"},
    {Opt_dmode, "dmode=%u"},
    {Opt_overriderockperm, "overriderockperm"},
    {Opt_block, "block=%u"},
    {Opt_ignore, "conv=binary"},
    {Opt_ignore, "conv=b"},
    {Opt_ignore, "conv=text"},
    {Opt_ignore, "conv=t"},
    {Opt_ignore, "conv=mtext"},
    {Opt_ignore, "conv=m"},
    {Opt_ignore, "conv=auto"},
    {Opt_ignore, "conv=a"},
    {Opt_nocompress, "nocompress"},
    {Opt_err, NULL}
};

static int parse_options(char *options, struct iso9660_options *popt)
{
    char *p;
    int option;

    popt->map = 'n';
    popt->rock = 1;
    popt->joliet = 1;
    popt->cruft = 0;
    popt->hide = 0;
    popt->showassoc = 0;
    popt->check = 'u';      /* unset */
    popt->nocompress = 0;
    popt->blocksize = 1024;
    popt->fmode = popt->dmode = ISOFS_INVALID_MODE;
    popt->uid_set = 0;
    popt->gid_set = 0;
    popt->gid = GLOBAL_ROOT_GID;
    popt->uid = GLOBAL_ROOT_UID;
    popt->iocharset = NULL;
    popt->utf8 = 0;
    popt->overriderockperm = 0;
    popt->session=-1;
    popt->sbsector=-1;
    if (!options)
        return 1;

    while ((p = strsep(&options, ",")) != NULL) {
        int token;
        substring_t args[MAX_OPT_ARGS];
        unsigned n;

        if (!*p)
            continue;

        token = match_token(p, tokens, args);
        switch (token) {
        case Opt_norock:
            popt->rock = 0;
            break;
        case Opt_nojoliet:
            popt->joliet = 0;
            break;
        case Opt_hide:
            popt->hide = 1;
            break;
        case Opt_unhide:
        case Opt_showassoc:
            popt->showassoc = 1;
            break;
        case Opt_cruft:
            popt->cruft = 1;
            break;
        case Opt_utf8:
            popt->utf8 = 1;
            break;
#ifdef CONFIG_JOLIET
        case Opt_iocharset:
            popt->iocharset = match_strdup(&args[0]);
            break;
#endif
        case Opt_map_a:
            popt->map = 'a';
            break;
        case Opt_map_o:
            popt->map = 'o';
            break;
        case Opt_map_n:
            popt->map = 'n';
            break;
        case Opt_session:
            if (match_int(&args[0], &option))
                return 0;
            n = option;
            if (n > 99)
                return 0;
            popt->session = n + 1;
            break;
        case Opt_sb:
            if (match_int(&args[0], &option))
                return 0;
            popt->sbsector = option;
            break;
        case Opt_check_r:
            popt->check = 'r';
            break;
        case Opt_check_s:
            popt->check = 's';
            break;
        case Opt_ignore:
            break;
        case Opt_uid:
            if (match_int(&args[0], &option))
                return 0;
            popt->uid = make_kuid(current_user_ns(), option);
            if (!uid_valid(popt->uid))
                return 0;
            popt->uid_set = 1;
            break;
        case Opt_gid:
            if (match_int(&args[0], &option))
                return 0;
            popt->gid = make_kgid(current_user_ns(), option);
            if (!gid_valid(popt->gid))
                return 0;
            popt->gid_set = 1;
            break;
        case Opt_mode:
            if (match_int(&args[0], &option))
                return 0;
            popt->fmode = option;
            break;
        case Opt_dmode:
            if (match_int(&args[0], &option))
                return 0;
            popt->dmode = option;
            break;
        case Opt_overriderockperm:
            popt->overriderockperm = 1;
            break;
        case Opt_block:
            if (match_int(&args[0], &option))
                return 0;
            n = option;
            if (n != 512 && n != 1024 && n != 2048)
                return 0;
            popt->blocksize = n;
            break;
        case Opt_nocompress:
            popt->nocompress = 1;
            break;
        default:
            return 0;
        }
    }
    return 1;
}

/*
 * look if the driver can tell the multi session redirection value
 *
 * don't change this if you don't know what you do, please!
 * Multisession is legal only with XA disks.
 * A non-XA disk with more than one volume descriptor may do it right, but
 * usually is written in a nowhere standardized "multi-partition" manner.
 * Multisession uses absolute addressing (solely the first frame of the whole
 * track is #0), multi-partition uses relative addressing (each first frame of
 * each track is #0), and a track is not a session.
 *
 * A broken CDwriter software or drive firmware does not set new standards,
 * at least not if conflicting with the existing ones.
 *
 * [email protected]
 */
#define WE_OBEY_THE_WRITTEN_STANDARDS 1

static unsigned int isofs_get_last_session(struct super_block *sb, s32 session)
{
    struct cdrom_multisession ms_info;
    unsigned int vol_desc_start;
    struct block_device *bdev = sb->s_bdev;
    int i;

    vol_desc_start=0;
    ms_info.addr_format=CDROM_LBA;
    if(session >= 0 && session <= 99) {
        struct cdrom_tocentry Te;
        Te.cdte_track=session;
        Te.cdte_format=CDROM_LBA;
        i = ioctl_by_bdev(bdev, CDROMREADTOCENTRY, (unsigned long) &Te);
        if (!i) {
            printk(KERN_DEBUG "ISOFS: Session %d start %d type %d\n",
                session, Te.cdte_addr.lba,
                Te.cdte_ctrl&CDROM_DATA_TRACK);
            if ((Te.cdte_ctrl&CDROM_DATA_TRACK) == 4)
                return Te.cdte_addr.lba;
        }

        printk(KERN_ERR "ISOFS: Invalid session number or type of track\n");
    }
    i = ioctl_by_bdev(bdev, CDROMMULTISESSION, (unsigned long) &ms_info);
    if (session > 0)
        printk(KERN_ERR "ISOFS: Invalid session number\n");
#if 0
    printk(KERN_DEBUG "isofs.inode: CDROMMULTISESSION: rc=%d\n",i);
    if (i==0) {
        printk(KERN_DEBUG "isofs.inode: XA disk: %s\n",ms_info.xa_flag?"yes":"no");
        printk(KERN_DEBUG "isofs.inode: vol_desc_start = %d\n", ms_info.addr.lba);
    }
#endif
    if (i==0)
#if WE_OBEY_THE_WRITTEN_STANDARDS
        if (ms_info.xa_flag) /* necessary for a valid ms_info.addr */
#endif
            vol_desc_start=ms_info.addr.lba;
    return vol_desc_start;
}

/*
 * Check if root directory is empty (has less than 3 files).
 *
 * Used to detect broken CDs where ISO root directory is empty but Joliet root
 * directory is OK. If such CD has Rock Ridge extensions, they will be disabled
 * (and Joliet used instead) or else no files would be visible.
 */
static bool rootdir_empty(struct super_block *sb, unsigned long block)
{
    int offset = 0, files = 0, de_len;
    struct iso_directory_record *de;
    struct buffer_head *bh;

    bh = sb_bread(sb, block);
    if (!bh)
        return true;
    while (files < 3) {
        de = (struct iso_directory_record *) (bh->b_data + offset);
        de_len = *(unsigned char *) de;
        if (de_len == 0)
            break;
        files++;
        offset += de_len;
    }
    brelse(bh);
    return files < 3;
}

/*
 * Initialize the superblock and read the root inode.
 *
 * Note: a check_disk_change() has been done immediately prior
 * to this call, so we don't need to check again.
 */
static int isofs_fill_super(struct super_block *s, void *data, int silent)
{
    struct buffer_head *bh = NULL, *pri_bh = NULL;
    struct hs_primary_descriptor *h_pri = NULL;
    struct iso_primary_descriptor *pri = NULL;
    struct iso_supplementary_descriptor *sec = NULL;
    struct iso_directory_record *rootp;
    struct inode *inode;
    struct iso9660_options opt;
    struct isofs_sb_info *sbi;
    unsigned long first_data_zone;
    int joliet_level = 0;
    int iso_blknum, block;
    int orig_zonesize;
    int table, error = -EINVAL;
    unsigned int vol_desc_start;

    save_mount_options(s, data);

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

    if (!parse_options((char *)data, &opt))
        goto out_freesbi;

    /*
     * First of all, get the hardware blocksize for this device.
     * If we don't know what it is, or the hardware blocksize is
     * larger than the blocksize the user specified, then use
     * that value.
     */
    /*
     * What if bugger tells us to go beyond page size?
     */
    opt.blocksize = sb_min_blocksize(s, opt.blocksize);

    sbi->s_high_sierra = 0; /* default is iso9660 */

    vol_desc_start = (opt.sbsector != -1) ?
        opt.sbsector : isofs_get_last_session(s,opt.session);

    for (iso_blknum = vol_desc_start+16;
        iso_blknum < vol_desc_start+100; iso_blknum++) {
        struct hs_volume_descriptor *hdp;
        struct iso_volume_descriptor  *vdp;

        block = iso_blknum << (ISOFS_BLOCK_BITS - s->s_blocksize_bits);
        if (!(bh = sb_bread(s, block)))
            goto out_no_read;

        vdp = (struct iso_volume_descriptor *)bh->b_data;
        hdp = (struct hs_volume_descriptor *)bh->b_data;

        /*
         * Due to the overlapping physical location of the descriptors,
         * ISO CDs can match hdp->id==HS_STANDARD_ID as well. To ensure
         * proper identification in this case, we first check for ISO.
         */
        if (strncmp (vdp->id, ISO_STANDARD_ID, sizeof vdp->id) == 0) {
            if (isonum_711(vdp->type) == ISO_VD_END)
                break;
            if (isonum_711(vdp->type) == ISO_VD_PRIMARY) {
                if (pri == NULL) {
                    pri = (struct iso_primary_descriptor *)vdp;
                    /* Save the buffer in case we need it ... */
                    pri_bh = bh;
                    bh = NULL;
                }
            }
#ifdef CONFIG_JOLIET
            else if (isonum_711(vdp->type) == ISO_VD_SUPPLEMENTARY) {
                sec = (struct iso_supplementary_descriptor *)vdp;
                if (sec->escape[0] == 0x25 && sec->escape[1] == 0x2f) {
                    if (opt.joliet) {
                        if (sec->escape[2] == 0x40)
                            joliet_level = 1;
                        else if (sec->escape[2] == 0x43)
                            joliet_level = 2;
                        else if (sec->escape[2] == 0x45)
                            joliet_level = 3;

                        printk(KERN_DEBUG "ISO 9660 Extensions: "
                            "Microsoft Joliet Level %d\n",
                            joliet_level);
                    }
                    goto root_found;
                } else {
                /* Unknown supplementary volume descriptor */
                sec = NULL;
                }
            }
#endif
        } else {
            if (strncmp (hdp->id, HS_STANDARD_ID, sizeof hdp->id) == 0) {
                if (isonum_711(hdp->type) != ISO_VD_PRIMARY)
                    goto out_freebh;

                sbi->s_high_sierra = 1;
                opt.rock = 0;
                h_pri = (struct hs_primary_descriptor *)vdp;
                goto root_found;
            }
        }

        /* Just skip any volume descriptors we don't recognize */

        brelse(bh);
        bh = NULL;
    }
    /*
     * If we fall through, either no volume descriptor was found,
     * or else we passed a primary descriptor looking for others.
     */
    if (!pri)
        goto out_unknown_format;
    brelse(bh);
    bh = pri_bh;
    pri_bh = NULL;

root_found:

    if (joliet_level && (pri == NULL || !opt.rock)) {
        /* This is the case of Joliet with the norock mount flag.
         * A disc with both Joliet and Rock Ridge is handled later
         */
        pri = (struct iso_primary_descriptor *) sec;
    }

    if(sbi->s_high_sierra){
        rootp = (struct iso_directory_record *) h_pri->root_directory_record;
        sbi->s_nzones = isonum_733(h_pri->volume_space_size);
        sbi->s_log_zone_size = isonum_723(h_pri->logical_block_size);
        sbi->s_max_size = isonum_733(h_pri->volume_space_size);
    } else {
        if (!pri)
            goto out_freebh;
        rootp = (struct iso_directory_record *) pri->root_directory_record;
        sbi->s_nzones = isonum_733(pri->volume_space_size);
        sbi->s_log_zone_size = isonum_723(pri->logical_block_size);
        sbi->s_max_size = isonum_733(pri->volume_space_size);
    }

    sbi->s_ninodes = 0; /* No way to figure this out easily */

    orig_zonesize = sbi->s_log_zone_size;
    /*
     * If the zone size is smaller than the hardware sector size,
     * this is a fatal error.  This would occur if the disc drive
     * had sectors that were 2048 bytes, but the filesystem had
     * blocks that were 512 bytes (which should only very rarely
     * happen.)
     */
    if (orig_zonesize < opt.blocksize)
        goto out_bad_size;

    /* RDE: convert log zone size to bit shift */
    switch (sbi->s_log_zone_size) {
    case  512: sbi->s_log_zone_size =  9; break;
    case 1024: sbi->s_log_zone_size = 10; break;
    case 2048: sbi->s_log_zone_size = 11; break;

    default:
        goto out_bad_zone_size;
    }

    s->s_magic = ISOFS_SUPER_MAGIC;

    /*
     * With multi-extent files, file size is only limited by the maximum
     * size of a file system, which is 8 TB.
     */
    s->s_maxbytes = 0x80000000000LL;

    /*
     * The CDROM is read-only, has no nodes (devices) on it, and since
     * all of the files appear to be owned by root, we really do not want
     * to allow suid.  (suid or devices will not show up unless we have
     * Rock Ridge extensions)
     */

    s->s_flags |= MS_RDONLY /* | MS_NODEV | MS_NOSUID */;

    /* Set this for reference. Its not currently used except on write
       which we don't have .. */

    first_data_zone = isonum_733(rootp->extent) +
              isonum_711(rootp->ext_attr_length);
    sbi->s_firstdatazone = first_data_zone;
#ifndef BEQUIET
    printk(KERN_DEBUG "ISOFS: Max size:%ld   Log zone size:%ld\n",
        sbi->s_max_size, 1UL << sbi->s_log_zone_size);
    printk(KERN_DEBUG "ISOFS: First datazone:%ld\n", sbi->s_firstdatazone);
    if(sbi->s_high_sierra)
        printk(KERN_DEBUG "ISOFS: Disc in High Sierra format.\n");
#endif

    /*
     * If the Joliet level is set, we _may_ decide to use the
     * secondary descriptor, but can't be sure until after we
     * read the root inode. But before reading the root inode
     * we may need to change the device blocksize, and would
     * rather release the old buffer first. So, we cache the
     * first_data_zone value from the secondary descriptor.
     */
    if (joliet_level) {
        pri = (struct iso_primary_descriptor *) sec;
        rootp = (struct iso_directory_record *)
            pri->root_directory_record;
        first_data_zone = isonum_733(rootp->extent) +
                isonum_711(rootp->ext_attr_length);
    }

    /*
     * We're all done using the volume descriptor, and may need
     * to change the device blocksize, so release the buffer now.
     */
    brelse(pri_bh);
    brelse(bh);

    /*
     * Force the blocksize to 512 for 512 byte sectors.  The file
     * read primitives really get it wrong in a bad way if we don't
     * do this.
     *
     * Note - we should never be setting the blocksize to something
     * less than the hardware sector size for the device.  If we
     * do, we would end up having to read larger buffers and split
     * out portions to satisfy requests.
     *
     * Note2- the idea here is that we want to deal with the optimal
     * zonesize in the filesystem.  If we have it set to something less,
     * then we have horrible problems with trying to piece together
     * bits of adjacent blocks in order to properly read directory
     * entries.  By forcing the blocksize in this way, we ensure
     * that we will never be required to do this.
     */
    sb_set_blocksize(s, orig_zonesize);

    sbi->s_nls_iocharset = NULL;

#ifdef CONFIG_JOLIET
    if (joliet_level && opt.utf8 == 0) {
        char *p = opt.iocharset ? opt.iocharset : CONFIG_NLS_DEFAULT;
        sbi->s_nls_iocharset = load_nls(p);
        if (! sbi->s_nls_iocharset) {
            /* Fail only if explicit charset specified */
            if (opt.iocharset)
                goto out_freesbi;
            sbi->s_nls_iocharset = load_nls_default();
        }
    }
#endif
    s->s_op = &isofs_sops;
    s->s_export_op = &isofs_export_ops;
    sbi->s_mapping = opt.map;
    sbi->s_rock = (opt.rock ? 2 : 0);
    sbi->s_rock_offset = -1; /* initial offset, will guess until SP is found*/
    sbi->s_cruft = opt.cruft;
    sbi->s_hide = opt.hide;
    sbi->s_showassoc = opt.showassoc;
    sbi->s_uid = opt.uid;
    sbi->s_gid = opt.gid;
    sbi->s_uid_set = opt.uid_set;
    sbi->s_gid_set = opt.gid_set;
    sbi->s_utf8 = opt.utf8;
    sbi->s_nocompress = opt.nocompress;
    sbi->s_overriderockperm = opt.overriderockperm;
    /*
     * It would be incredibly stupid to allow people to mark every file
     * on the disk as suid, so we merely allow them to set the default
     * permissions.
     */
    if (opt.fmode != ISOFS_INVALID_MODE)
        sbi->s_fmode = opt.fmode & 0777;
    else
        sbi->s_fmode = ISOFS_INVALID_MODE;
    if (opt.dmode != ISOFS_INVALID_MODE)
        sbi->s_dmode = opt.dmode & 0777;
    else
        sbi->s_dmode = ISOFS_INVALID_MODE;

    /*
     * Read the root inode, which _may_ result in changing
     * the s_rock flag. Once we have the final s_rock value,
     * we then decide whether to use the Joliet descriptor.
     */
    inode = isofs_iget(s, sbi->s_firstdatazone, 0);
    if (IS_ERR(inode))
        goto out_no_root;

    /*
     * Fix for broken CDs with Rock Ridge and empty ISO root directory but
     * correct Joliet root directory.
     */
    if (sbi->s_rock == 1 && joliet_level &&
                rootdir_empty(s, sbi->s_firstdatazone)) {
        printk(KERN_NOTICE
            "ISOFS: primary root directory is empty. "
            "Disabling Rock Ridge and switching to Joliet.");
        sbi->s_rock = 0;
    }

    /*
     * If this disk has both Rock Ridge and Joliet on it, then we
     * want to use Rock Ridge by default.  This can be overridden
     * by using the norock mount option.  There is still one other
     * possibility that is not taken into account: a Rock Ridge
     * CD with Unicode names.  Until someone sees such a beast, it
     * will not be supported.
     */
    if (sbi->s_rock == 1) {
        joliet_level = 0;
    } else if (joliet_level) {
        sbi->s_rock = 0;
        if (sbi->s_firstdatazone != first_data_zone) {
            sbi->s_firstdatazone = first_data_zone;
            printk(KERN_DEBUG
                "ISOFS: changing to secondary root\n");
            iput(inode);
            inode = isofs_iget(s, sbi->s_firstdatazone, 0);
            if (IS_ERR(inode))
                goto out_no_root;
        }
    }

    if (opt.check == 'u') {
        /* Only Joliet is case insensitive by default */
        if (joliet_level)
            opt.check = 'r';
        else
            opt.check = 's';
    }
    sbi->s_joliet_level = joliet_level;

    /* Make sure the root inode is a directory */
    if (!S_ISDIR(inode->i_mode)) {
        printk(KERN_WARNING
            "isofs_fill_super: root inode is not a directory. "
            "Corrupted media?\n");
        goto out_iput;
    }

    table = 0;
    if (joliet_level)
        table += 2;
    if (opt.check == 'r')
        table++;

    s->s_d_op = &isofs_dentry_ops[table];

    /* get the root dentry */
    s->s_root = d_make_root(inode);
    if (!(s->s_root)) {
        error = -ENOMEM;
        goto out_no_inode;
    }

    kfree(opt.iocharset);

    return 0;

    /*
     * Display error messages and free resources.
     */
out_iput:
    iput(inode);
    goto out_no_inode;
out_no_root:
    error = PTR_ERR(inode);
    if (error != -ENOMEM)
        printk(KERN_WARNING "%s: get root inode failed\n", __func__);
out_no_inode:
#ifdef CONFIG_JOLIET
    unload_nls(sbi->s_nls_iocharset);
#endif
    goto out_freesbi;
out_no_read:
    printk(KERN_WARNING "%s: bread failed, dev=%s, iso_blknum=%d, block=%d\n",
        __func__, s->s_id, iso_blknum, block);
    goto out_freebh;
out_bad_zone_size:
    printk(KERN_WARNING "ISOFS: Bad logical zone size %ld\n",
        sbi->s_log_zone_size);
    goto out_freebh;
out_bad_size:
    printk(KERN_WARNING "ISOFS: Logical zone size(%d) < hardware blocksize(%u)\n",
        orig_zonesize, opt.blocksize);
    goto out_freebh;
out_unknown_format:
    if (!silent)
        printk(KERN_WARNING "ISOFS: Unable to identify CD-ROM format.\n");

out_freebh:
    brelse(bh);
    brelse(pri_bh);
out_freesbi:
    kfree(opt.iocharset);
    kfree(sbi);
    s->s_fs_info = NULL;
    return error;
}

static int isofs_statfs (struct dentry *dentry, struct kstatfs *buf)
{
    struct super_block *sb = dentry->d_sb;
    u64 id = huge_encode_dev(sb->s_bdev->bd_dev);

    buf->f_type = ISOFS_SUPER_MAGIC;
    buf->f_bsize = sb->s_blocksize;
    buf->f_blocks = (ISOFS_SB(sb)->s_nzones
        << (ISOFS_SB(sb)->s_log_zone_size - sb->s_blocksize_bits));
    buf->f_bfree = 0;
    buf->f_bavail = 0;
    buf->f_files = ISOFS_SB(sb)->s_ninodes;
    buf->f_ffree = 0;
    buf->f_fsid.val[0] = (u32)id;
    buf->f_fsid.val[1] = (u32)(id >> 32);
    buf->f_namelen = NAME_MAX;
    return 0;
}

/*
 * Get a set of blocks; filling in buffer_heads if already allocated
 * or getblk() if they are not.  Returns the number of blocks inserted
 * (-ve == error.)
 */
int isofs_get_blocks(struct inode *inode, sector_t iblock,
             struct buffer_head **bh, unsigned long nblocks)
{
    unsigned long b_off = iblock;
    unsigned offset, sect_size;
    unsigned int firstext;
    unsigned long nextblk, nextoff;
    int section, rv, error;
    struct iso_inode_info *ei = ISOFS_I(inode);

    error = -EIO;
    rv = 0;
    if (iblock != b_off) {
        printk(KERN_DEBUG "%s: block number too large\n", __func__);
        goto abort;
    }


    offset = 0;
    firstext = ei->i_first_extent;
    sect_size = ei->i_section_size >> ISOFS_BUFFER_BITS(inode);
    nextblk = ei->i_next_section_block;
    nextoff = ei->i_next_section_offset;
    section = 0;

    while (nblocks) {
        /* If we are *way* beyond the end of the file, print a message.
         * Access beyond the end of the file up to the next page boundary
         * is normal, however because of the way the page cache works.
         * In this case, we just return 0 so that we can properly fill
         * the page with useless information without generating any
         * I/O errors.
         */
        if (b_off > ((inode->i_size + PAGE_CACHE_SIZE - 1) >> ISOFS_BUFFER_BITS(inode))) {
            printk(KERN_DEBUG "%s: block >= EOF (%lu, %llu)\n",
                __func__, b_off,
                (unsigned long long)inode->i_size);
            goto abort;
        }

        /* On the last section, nextblk == 0, section size is likely to
         * exceed sect_size by a partial block, and access beyond the
         * end of the file will reach beyond the section size, too.
         */
        while (nextblk && (b_off >= (offset + sect_size))) {
            struct inode *ninode;

            offset += sect_size;
            ninode = isofs_iget(inode->i_sb, nextblk, nextoff);
            if (IS_ERR(ninode)) {
                error = PTR_ERR(ninode);
                goto abort;
            }
            firstext  = ISOFS_I(ninode)->i_first_extent;
            sect_size = ISOFS_I(ninode)->i_section_size >> ISOFS_BUFFER_BITS(ninode);
            nextblk   = ISOFS_I(ninode)->i_next_section_block;
            nextoff   = ISOFS_I(ninode)->i_next_section_offset;
            iput(ninode);

            if (++section > 100) {
                printk(KERN_DEBUG "%s: More than 100 file sections ?!?"
                    " aborting...\n", __func__);
                printk(KERN_DEBUG "%s: block=%lu firstext=%u sect_size=%u "
                    "nextblk=%lu nextoff=%lu\n", __func__,
                    b_off, firstext, (unsigned) sect_size,
                    nextblk, nextoff);
                goto abort;
            }
        }

        if (*bh) {
            map_bh(*bh, inode->i_sb, firstext + b_off - offset);
        } else {
            *bh = sb_getblk(inode->i_sb, firstext+b_off-offset);
            if (!*bh)
                goto abort;
        }
        bh++;   /* Next buffer head */
        b_off++;    /* Next buffer offset */
        nblocks--;
        rv++;
    }

    error = 0;
abort:
    return rv != 0 ? rv : error;
}

/*
 * Used by the standard interfaces.
 */
static int isofs_get_block(struct inode *inode, sector_t iblock,
            struct buffer_head *bh_result, int create)
{
    int ret;

    if (create) {
        printk(KERN_DEBUG "%s: Kernel tries to allocate a block\n", __func__);
        return -EROFS;
    }

    ret = isofs_get_blocks(inode, iblock, &bh_result, 1);
    return ret < 0 ? ret : 0;
}

static int isofs_bmap(struct inode *inode, sector_t block)
{
    struct buffer_head dummy;
    int error;

    dummy.b_state = 0;
    dummy.b_blocknr = -1000;
    error = isofs_get_block(inode, block, &dummy, 0);
    if (!error)
        return dummy.b_blocknr;
    return 0;
}

struct buffer_head *isofs_bread(struct inode *inode, sector_t block)
{
    sector_t blknr = isofs_bmap(inode, block);
    if (!blknr)
        return NULL;
    return sb_bread(inode->i_sb, blknr);
}

static int isofs_readpage(struct file *file, struct page *page)
{
    return mpage_readpage(page, isofs_get_block);
}

static int isofs_readpages(struct file *file, struct address_space *mapping,
            struct list_head *pages, unsigned nr_pages)
{
    return mpage_readpages(mapping, pages, nr_pages, isofs_get_block);
}

static sector_t _isofs_bmap(struct address_space *mapping, sector_t block)
{
    return generic_block_bmap(mapping,block,isofs_get_block);
}

static const struct address_space_operations isofs_aops = {
    .readpage = isofs_readpage,
    .readpages = isofs_readpages,
    .bmap = _isofs_bmap
};

static int isofs_read_level3_size(struct inode *inode)
{
    unsigned long bufsize = ISOFS_BUFFER_SIZE(inode);
    int high_sierra = ISOFS_SB(inode->i_sb)->s_high_sierra;
    struct buffer_head *bh = NULL;
    unsigned long block, offset, block_saved, offset_saved;
    int i = 0;
    int more_entries = 0;
    struct iso_directory_record *tmpde = NULL;
    struct iso_inode_info *ei = ISOFS_I(inode);

    inode->i_size = 0;

    /* The first 16 blocks are reserved as the System Area.  Thus,
     * no inodes can appear in block 0.  We use this to flag that
     * this is the last section. */
    ei->i_next_section_block = 0;
    ei->i_next_section_offset = 0;

    block = ei->i_iget5_block;
    offset = ei->i_iget5_offset;

    do {
        struct iso_directory_record *de;
        unsigned int de_len;

        if (!bh) {
            bh = sb_bread(inode->i_sb, block);
            if (!bh)
                goto out_noread;
        }
        de = (struct iso_directory_record *) (bh->b_data + offset);
        de_len = *(unsigned char *) de;

        if (de_len == 0) {
            brelse(bh);
            bh = NULL;
            ++block;
            offset = 0;
            continue;
        }

        block_saved = block;
        offset_saved = offset;
        offset += de_len;

        /* Make sure we have a full directory entry */
        if (offset >= bufsize) {
            int slop = bufsize - offset + de_len;
            if (!tmpde) {
                tmpde = kmalloc(256, GFP_KERNEL);
                if (!tmpde)
                    goto out_nomem;
            }
            memcpy(tmpde, de, slop);
            offset &= bufsize - 1;
            block++;
            brelse(bh);
            bh = NULL;
            if (offset) {
                bh = sb_bread(inode->i_sb, block);
                if (!bh)
                    goto out_noread;
                memcpy((void *)tmpde+slop, bh->b_data, offset);
            }
            de = tmpde;
        }

        inode->i_size += isonum_733(de->size);
        if (i == 1) {
            ei->i_next_section_block = block_saved;
            ei->i_next_section_offset = offset_saved;
        }

        more_entries = de->flags[-high_sierra] & 0x80;

        i++;
        if (i > 100)
            goto out_toomany;
    } while (more_entries);
out:
    kfree(tmpde);
    if (bh)
        brelse(bh);
    return 0;

out_nomem:
    if (bh)
        brelse(bh);
    return -ENOMEM;

out_noread:
    printk(KERN_INFO "ISOFS: unable to read i-node block %lu\n", block);
    kfree(tmpde);
    return -EIO;

out_toomany:
    printk(KERN_INFO "%s: More than 100 file sections ?!?, aborting...\n"
        "isofs_read_level3_size: inode=%lu\n",
        __func__, inode->i_ino);
    goto out;
}

static int isofs_read_inode(struct inode *inode)
{
    struct super_block *sb = inode->i_sb;
    struct isofs_sb_info *sbi = ISOFS_SB(sb);
    unsigned long bufsize = ISOFS_BUFFER_SIZE(inode);
    unsigned long block;
    int high_sierra = sbi->s_high_sierra;
    struct buffer_head *bh = NULL;
    struct iso_directory_record *de;
    struct iso_directory_record *tmpde = NULL;
    unsigned int de_len;
    unsigned long offset;
    struct iso_inode_info *ei = ISOFS_I(inode);
    int ret = -EIO;

    block = ei->i_iget5_block;
    bh = sb_bread(inode->i_sb, block);
    if (!bh)
        goto out_badread;

    offset = ei->i_iget5_offset;

    de = (struct iso_directory_record *) (bh->b_data + offset);
    de_len = *(unsigned char *) de;

    if (offset + de_len > bufsize) {
        int frag1 = bufsize - offset;

        tmpde = kmalloc(de_len, GFP_KERNEL);
        if (tmpde == NULL) {
            printk(KERN_INFO "%s: out of memory\n", __func__);
            ret = -ENOMEM;
            goto fail;
        }
        memcpy(tmpde, bh->b_data + offset, frag1);
        brelse(bh);
        bh = sb_bread(inode->i_sb, ++block);
        if (!bh)
            goto out_badread;
        memcpy((char *)tmpde+frag1, bh->b_data, de_len - frag1);
        de = tmpde;
    }

    inode->i_ino = isofs_get_ino(ei->i_iget5_block,
                    ei->i_iget5_offset,
                    ISOFS_BUFFER_BITS(inode));

    /* Assume it is a normal-format file unless told otherwise */
    ei->i_file_format = isofs_file_normal;

    if (de->flags[-high_sierra] & 2) {
        if (sbi->s_dmode != ISOFS_INVALID_MODE)
            inode->i_mode = S_IFDIR | sbi->s_dmode;
        else
            inode->i_mode = S_IFDIR | S_IRUGO | S_IXUGO;
        set_nlink(inode, 1);    /*
                     * Set to 1.  We know there are 2, but
                     * the find utility tries to optimize
                     * if it is 2, and it screws up.  It is
                     * easier to give 1 which tells find to
                     * do it the hard way.
                     */
    } else {
        if (sbi->s_fmode != ISOFS_INVALID_MODE) {
            inode->i_mode = S_IFREG | sbi->s_fmode;
        } else {
            /*
             * Set default permissions: r-x for all.  The disc
             * could be shared with DOS machines so virtually
             * anything could be a valid executable.
             */
            inode->i_mode = S_IFREG | S_IRUGO | S_IXUGO;
        }
        set_nlink(inode, 1);
    }
    inode->i_uid = sbi->s_uid;
    inode->i_gid = sbi->s_gid;
    inode->i_blocks = 0;

    ei->i_format_parm[0] = 0;
    ei->i_format_parm[1] = 0;
    ei->i_format_parm[2] = 0;

    ei->i_section_size = isonum_733(de->size);
    if (de->flags[-high_sierra] & 0x80) {
        ret = isofs_read_level3_size(inode);
        if (ret < 0)
            goto fail;
        ret = -EIO;
    } else {
        ei->i_next_section_block = 0;
        ei->i_next_section_offset = 0;
        inode->i_size = isonum_733(de->size);
    }

    /*
     * Some dipshit decided to store some other bit of information
     * in the high byte of the file length.  Truncate size in case
     * this CDROM was mounted with the cruft option.
     */

    if (sbi->s_cruft)
        inode->i_size &= 0x00ffffff;

    if (de->interleave[0]) {
        printk(KERN_DEBUG "ISOFS: Interleaved files not (yet) supported.\n");
        inode->i_size = 0;
    }

    /* I have no idea what file_unit_size is used for, so
       we will flag it for now */
    if (de->file_unit_size[0] != 0) {
        printk(KERN_DEBUG "ISOFS: File unit size != 0 for ISO file (%ld).\n",
            inode->i_ino);
    }

    /* I have no idea what other flag bits are used for, so
       we will flag it for now */
#ifdef DEBUG
    if((de->flags[-high_sierra] & ~2)!= 0){
        printk(KERN_DEBUG "ISOFS: Unusual flag settings for ISO file "
                "(%ld %x).\n",
            inode->i_ino, de->flags[-high_sierra]);
    }
#endif

    inode->i_mtime.tv_sec =
    inode->i_atime.tv_sec =
    inode->i_ctime.tv_sec = iso_date(de->date, high_sierra);
    inode->i_mtime.tv_nsec =
    inode->i_atime.tv_nsec =
    inode->i_ctime.tv_nsec = 0;

    ei->i_first_extent = (isonum_733(de->extent) +
            isonum_711(de->ext_attr_length));

    /* Set the number of blocks for stat() - should be done before RR */
    inode->i_blocks = (inode->i_size + 511) >> 9;

    /*
     * Now test for possible Rock Ridge extensions which will override
     * some of these numbers in the inode structure.
     */

    if (!high_sierra) {
        parse_rock_ridge_inode(de, inode);
        /* if we want uid/gid set, override the rock ridge setting */
        if (sbi->s_uid_set)
            inode->i_uid = sbi->s_uid;
        if (sbi->s_gid_set)
            inode->i_gid = sbi->s_gid;
    }
    /* Now set final access rights if overriding rock ridge setting */
    if (S_ISDIR(inode->i_mode) && sbi->s_overriderockperm &&
        sbi->s_dmode != ISOFS_INVALID_MODE)
        inode->i_mode = S_IFDIR | sbi->s_dmode;
    if (S_ISREG(inode->i_mode) && sbi->s_overriderockperm &&
        sbi->s_fmode != ISOFS_INVALID_MODE)
        inode->i_mode = S_IFREG | sbi->s_fmode;

    /* Install the inode operations vector */
    if (S_ISREG(inode->i_mode)) {
        inode->i_fop = &generic_ro_fops;
        switch (ei->i_file_format) {
#ifdef CONFIG_ZISOFS
        case isofs_file_compressed:
            inode->i_data.a_ops = &zisofs_aops;
            break;
#endif
        default:
            inode->i_data.a_ops = &isofs_aops;
            break;
        }
    } else if (S_ISDIR(inode->i_mode)) {
        inode->i_op = &isofs_dir_inode_operations;
        inode->i_fop = &isofs_dir_operations;
    } else if (S_ISLNK(inode->i_mode)) {
        inode->i_op = &page_symlink_inode_operations;
        inode->i_data.a_ops = &isofs_symlink_aops;
    } else
        /* XXX - parse_rock_ridge_inode() had already set i_rdev. */
        init_special_inode(inode, inode->i_mode, inode->i_rdev);

    ret = 0;
out:
    kfree(tmpde);
    if (bh)
        brelse(bh);
    return ret;

out_badread:
    printk(KERN_WARNING "ISOFS: unable to read i-node block\n");
fail:
    goto out;
}

struct isofs_iget5_callback_data {
    unsigned long block;
    unsigned long offset;
};

static int isofs_iget5_test(struct inode *ino, void *data)
{
    struct iso_inode_info *i = ISOFS_I(ino);
    struct isofs_iget5_callback_data *d =
        (struct isofs_iget5_callback_data*)data;
    return (i->i_iget5_block == d->block)
        && (i->i_iget5_offset == d->offset);
}

static int isofs_iget5_set(struct inode *ino, void *data)
{
    struct iso_inode_info *i = ISOFS_I(ino);
    struct isofs_iget5_callback_data *d =
        (struct isofs_iget5_callback_data*)data;
    i->i_iget5_block = d->block;
    i->i_iget5_offset = d->offset;
    return 0;
}

/* Store, in the inode's containing structure, the block and block
 * offset that point to the underlying meta-data for the inode.  The
 * code below is otherwise similar to the iget() code in
 * include/linux/fs.h */
struct inode *isofs_iget(struct super_block *sb,
             unsigned long block,
             unsigned long offset)
{
    unsigned long hashval;
    struct inode *inode;
    struct isofs_iget5_callback_data data;
    long ret;

    if (offset >= 1ul << sb->s_blocksize_bits)
        return ERR_PTR(-EINVAL);

    data.block = block;
    data.offset = offset;

    hashval = (block << sb->s_blocksize_bits) | offset;

    inode = iget5_locked(sb, hashval, &isofs_iget5_test,
                &isofs_iget5_set, &data);

    if (!inode)
        return ERR_PTR(-ENOMEM);

    if (inode->i_state & I_NEW) {
        ret = isofs_read_inode(inode);
        if (ret < 0) {
            iget_failed(inode);
            inode = ERR_PTR(ret);
        } else {
            unlock_new_inode(inode);
        }
    }

    return inode;
}

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

static struct file_system_type iso9660_fs_type = {
    .owner      = THIS_MODULE,
    .name       = "iso9660",
    .mount      = isofs_mount,
    .kill_sb    = kill_block_super,
    .fs_flags   = FS_REQUIRES_DEV,
};

static int __init init_iso9660_fs(void)
{
    int err = init_inodecache();
    if (err)
        goto out;
#ifdef CONFIG_ZISOFS
    err = zisofs_init();
    if (err)
        goto out1;
#endif
    err = register_filesystem(&iso9660_fs_type);
    if (err)
        goto out2;
    return 0;
out2:
#ifdef CONFIG_ZISOFS
    zisofs_cleanup();
out1:
#endif
    destroy_inodecache();
out:
    return err;
}

static void __exit exit_iso9660_fs(void)
{
        unregister_filesystem(&iso9660_fs_type);
#ifdef CONFIG_ZISOFS
    zisofs_cleanup();
#endif
    destroy_inodecache();
}

module_init(init_iso9660_fs)
module_exit(exit_iso9660_fs)
MODULE_LICENSE("GPL");
/* Actual filesystem name is iso9660, as requested in filesystems.c */
MODULE_ALIAS("iso9660");