Import 2.3.26pre2

[davej-history.git] / fs / udf / super.c

/*
 * super.c
 *
 * PURPOSE
 *  Super block routines for the OSTA-UDF(tm) filesystem.
 *
 * DESCRIPTION
 *  OSTA-UDF(tm) = Optical Storage Technology Association
 *  Universal Disk Format.
 *
 *  This code is based on version 2.00 of the UDF specification,
 *  and revision 3 of the ECMA 167 standard [equivalent to ISO 13346].
 *    http://www.osta.org/
 *    http://www.ecma.ch/
 *    http://www.iso.org/
 *
 * CONTACTS
 *  E-mail regarding any portion of the Linux UDF file system should be
 *  directed to the development team mailing list (run by majordomo):
 *        linux_udf@hootie.lvld.hp.com
 *
 * COPYRIGHT
 *  This file is distributed under the terms of the GNU General Public
 *  License (GPL). Copies of the GPL can be obtained from:
 *    ftp://prep.ai.mit.edu/pub/gnu/GPL
 *  Each contributing author retains all rights to their own work.
 *
 *  (C) 1998 Dave Boynton
 *  (C) 1998-1999 Ben Fennema
 *
 * HISTORY
 *
 *  09/24/98 dgb  changed to allow compiling outside of kernel, and
 *                added some debugging.
 *  10/01/98 dgb  updated to allow (some) possibility of compiling w/2.0.34
 *  10/16/98      attempting some multi-session support
 *  10/17/98      added freespace count for "df"
 *  11/11/98 gr   added novrs option
 *  11/26/98 dgb  added fileset,anchor mount options
 *  12/06/98 blf  really hosed things royally. vat/sparing support. sequenced vol descs
 *                rewrote option handling based on isofs
 *  12/20/98      find the free space bitmap (if it exists)
 */

#ifndef LINUX_VERSION_CODE
#include <linux/version.h>
#endif

#include "udfdecl.h"    

#include <linux/blkdev.h>
#include <linux/malloc.h>
#include <linux/kernel.h>
#include <linux/locks.h>
#include <linux/module.h>
#include <linux/stat.h>
#include <linux/cdrom.h>
#include <linux/nls.h>
#include <asm/byteorder.h>

#include <linux/udf_fs.h>
#include "udf_sb.h"
#include "udf_i.h"

#include <linux/init.h>
#include <asm/uaccess.h>

static char error_buf[1024];

/* These are the "meat" - everything else is stuffing */
static struct super_block *udf_read_super(struct super_block *, void *, int);
static void udf_put_super(struct super_block *);
static int udf_remount_fs(struct super_block *, int *, char *);
static int udf_check_valid(struct super_block *, int, int);
static int udf_vrs(struct super_block *sb, int silent);
static int udf_load_partition(struct super_block *, lb_addr *);
static int udf_load_logicalvol(struct super_block *, struct buffer_head *, lb_addr *);
static void udf_load_logicalvolint(struct super_block *, extent_ad);
static int udf_find_anchor(struct super_block *, int, int);
static int udf_find_fileset(struct super_block *, lb_addr *, lb_addr *);
static void udf_load_pvoldesc(struct super_block *, struct buffer_head *);
static void udf_load_fileset(struct super_block *, struct buffer_head *, lb_addr *);
static void udf_load_partdesc(struct super_block *, struct buffer_head *);
static void udf_open_lvid(struct super_block *);
static void udf_close_lvid(struct super_block *);
static unsigned int udf_count_free(struct super_block *);

/* version specific functions */
static int udf_statfs(struct super_block *, struct statfs *, int);

/* UDF filesystem type */
static struct file_system_type udf_fstype = {
        "udf",                  /* name */
        FS_REQUIRES_DEV,        /* fs_flags */
        udf_read_super,         /* read_super */
        NULL                    /* next */
};

/* Superblock operations */
static struct super_operations udf_sb_ops =
{
        udf_read_inode,         /* read_inode */
#ifdef CONFIG_UDF_RW
        udf_write_inode,        /* write_inode */
#else
        NULL,                           /* write_inode */
#endif
        udf_put_inode,          /* put_inode */
#ifdef CONFIG_UDF_RW
        udf_delete_inode,       /* delete_inode */
#else
        NULL,                           /* delete_inode */
#endif
        NULL,                           /* notify_change */
        udf_put_super,          /* put_super */
        NULL,                           /* write_super */
        udf_statfs,                     /* statfs */
        udf_remount_fs,         /* remount_fs */
        NULL,                           /* clear_inode */
        NULL,                           /* umount_begin */
};

struct udf_options
{
        unsigned char novrs;
        unsigned char utf8;
        unsigned int blocksize;
        unsigned int session;
        unsigned int lastblock;
        unsigned int anchor;
        unsigned int volume;
        unsigned short partition;
        unsigned int fileset;
        unsigned int rootdir;
        unsigned int flags;
        mode_t umask;
        gid_t gid;
        uid_t uid;
        char *iocharset;
};

#if defined(MODULE)
        
/*
 * cleanup_module
 *
 * PURPOSE
 *      Unregister the UDF filesystem type.
 *
 * DESCRIPTION
 *      Clean-up before the module is unloaded.
 *      This routine only applies when compiled as a module.
 *
 * HISTORY
 *      July 1, 1997 - Andrew E. Mileski
 *      Written, tested, and released.
 */
int
cleanup_module(void)
{
        printk(KERN_NOTICE "udf: unregistering filesystem\n");
        return unregister_filesystem(&udf_fstype);
}

/*
 * init_module / init_udf_fs
 *
 * PURPOSE
 *      Register the UDF filesystem type.
 *
 * HISTORY
 *      July 1, 1997 - Andrew E. Mileski
 *      Written, tested, and released.
 */
int init_module(void)
#else /* if !defined(MODULE) */
int __init init_udf_fs(void)
#endif
{
        printk(KERN_NOTICE "udf: registering filesystem\n");
        {
                struct super_block sb;
                int size;

                size = sizeof(struct super_block) +
                        (long)&sb.u - (long)&sb;
                if ( size < sizeof(struct udf_sb_info) )
                {
                        printk(KERN_ERR "udf: Danger! Kernel was compiled without enough room for udf_sb_info\n");
                        printk(KERN_ERR "udf: Kernel has room for %u bytes, udf needs %u\n",
                                size, sizeof(struct udf_sb_info));
                        return 0;
                }
        }
        return register_filesystem(&udf_fstype);
}

/*
 * udf_parse_options
 *
 * PURPOSE
 *      Parse mount options.
 *
 * DESCRIPTION
 *      The following mount options are supported:
 *
 *      gid=            Set the default group.
 *      umask=          Set the default umask.
 *      uid=            Set the default user.
 *      unhide          Show otherwise hidden files.
 *      undelete        Show deleted files in lists.
 *      strict          Set strict conformance (unused)
 *      utf8            (unused)
 *      iocharset       (unused)
 *
 *      The remaining are for debugging and disaster recovery:
 *
 *      bs=             Set the block size. (may not work unless 2048)
 *      novrs           Skip volume sequence recognition 
 *
 *      The following expect a offset from 0.
 *
 *      session=        Set the CDROM session (default= last session)
 *      anchor=         Override standard anchor location. (default= 256)
 *      volume=         Override the VolumeDesc location. (unused)
 *      partition=      Override the PartitionDesc location. (unused)
 *      lastblock=      Set the last block of the filesystem/
 *
 *      The following expect a offset from the partition root.
 *
 *      fileset=        Override the fileset block location. (unused)
 *      rootdir=        Override the root directory location. (unused)
 *              WARNING: overriding the rootdir to a non-directory may
 *              yield highly unpredictable results.
 *
 * PRE-CONDITIONS
 *      options         Pointer to mount options string.
 *      uopts           Pointer to mount options variable.
 *
 * POST-CONDITIONS
 *      <return>        0       Mount options parsed okay.
 *      <return>        -1      Error parsing mount options.
 *
 * HISTORY
 *      July 1, 1997 - Andrew E. Mileski
 *      Written, tested, and released.
 */

static int
udf_parse_options(char *options, struct udf_options *uopt)
{
        char *opt, *val;

        uopt->novrs = 0;
        uopt->blocksize = 2048;
        uopt->partition = 0xFFFF;
        uopt->session = 0xFFFFFFFF;
        uopt->lastblock = 0xFFFFFFFF;
        uopt->anchor = 0xFFFFFFFF;
        uopt->volume = 0xFFFFFFFF;
        uopt->rootdir = 0xFFFFFFFF;
        uopt->fileset = 0xFFFFFFFF;
        uopt->iocharset = NULL;

        if (!options)
                return 1;

        for (opt = strtok(options, ","); opt; opt = strtok(NULL, ","))
        {
                /* Make "opt=val" into two strings */
                val = strchr(opt, '=');
                if (val)
                        *(val++) = 0;
                if (!strcmp(opt, "novrs") && !val)
                        uopt->novrs = 1;
                else if (!strcmp(opt, "utf8") && !val)
                        uopt->utf8 = 1;
                else if (!strcmp(opt, "bs") && val)
                        uopt->blocksize = simple_strtoul(val, NULL, 0);
                else if (!strcmp(opt, "unhide") && !val)
                        uopt->flags |= UDF_FLAG_UNHIDE;
                else if (!strcmp(opt, "undelete") && !val)
                        uopt->flags |= UDF_FLAG_UNDELETE;
                else if (!strcmp(opt, "gid") && val)
                        uopt->gid = simple_strtoul(val, NULL, 0);
                else if (!strcmp(opt, "umask") && val)
                        uopt->umask = simple_strtoul(val, NULL, 0);
                else if (!strcmp(opt, "strict") && !val)
                        uopt->flags |= UDF_FLAG_STRICT;
                else if (!strcmp(opt, "uid") && val)
                        uopt->uid = simple_strtoul(val, NULL, 0);
                else if (!strcmp(opt, "session") && val)
                        uopt->session = simple_strtoul(val, NULL, 0);
                else if (!strcmp(opt, "lastblock") && val)
                        uopt->lastblock = simple_strtoul(val, NULL, 0);
                else if (!strcmp(opt, "anchor") && val)
                        uopt->anchor = simple_strtoul(val, NULL, 0);
                else if (!strcmp(opt, "volume") && val)
                        uopt->volume = simple_strtoul(val, NULL, 0);
                else if (!strcmp(opt, "partition") && val)
                        uopt->partition = simple_strtoul(val, NULL, 0);
                else if (!strcmp(opt, "fileset") && val)
                        uopt->fileset = simple_strtoul(val, NULL, 0);
                else if (!strcmp(opt, "rootdir") && val)
                        uopt->rootdir = simple_strtoul(val, NULL, 0);
                else if (!strcmp(opt, "iocharset") && val)
                {
                        uopt->iocharset = val;
                        while (*val && *val != ',')
                                val ++;
                        if (val == uopt->iocharset)
                                return 0;
                        *val = 0;
                }
                else if (val)
                {
                        printk(KERN_ERR "udf: bad mount option \"%s=%s\"\n",
                                opt, val);
                        return 0;
                }
                else
                {
                        printk(KERN_ERR "udf: bad mount option \"%s\"\n",
                                opt);
                        return 0;
                }
        }
        return 1;
}

static int
udf_remount_fs(struct super_block *sb, int *flags, char *options)
{
        struct udf_options uopt;

        uopt.flags =    UDF_SB(sb)->s_flags ;
        uopt.uid =      UDF_SB(sb)->s_uid ;
        uopt.gid =      UDF_SB(sb)->s_gid ;
        uopt.umask =    UDF_SB(sb)->s_umask ;
        uopt.utf8 =     UDF_SB(sb)->s_utf8 ;

        if ( !udf_parse_options(options, &uopt) )
                return -EINVAL;

        UDF_SB(sb)->s_flags =   uopt.flags;
        UDF_SB(sb)->s_uid =     uopt.uid;
        UDF_SB(sb)->s_gid =     uopt.gid;
        UDF_SB(sb)->s_umask =   uopt.umask;
        UDF_SB(sb)->s_utf8 =    uopt.utf8;

        if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
                return 0;
        if (*flags & MS_RDONLY)
                udf_close_lvid(sb);
        else
                udf_open_lvid(sb);

        return 0;
}

/*
 * udf_set_blocksize
 *
 * PURPOSE
 *      Set the block size to be used in all transfers.
 *
 * DESCRIPTION
 *      To allow room for a DMA transfer, it is best to guess big when unsure.
 *      This routine picks 2048 bytes as the blocksize when guessing. This
 *      should be adequate until devices with larger block sizes become common.
 *
 *      Note that the Linux kernel can currently only deal with blocksizes of
 *      512, 1024, 2048, 4096, and 8192 bytes.
 *
 * PRE-CONDITIONS
 *      sb                      Pointer to _locked_ superblock.
 *
 * POST-CONDITIONS
 *      sb->s_blocksize         Blocksize.
 *      sb->s_blocksize_bits    log2 of blocksize.
 *      <return>        0       Blocksize is valid.
 *      <return>        1       Blocksize is invalid.
 *
 * HISTORY
 *      July 1, 1997 - Andrew E. Mileski
 *      Written, tested, and released.
 */
static  int
udf_set_blocksize(struct super_block *sb, int bsize)
{
        /* Use specified block size if specified */
        sb->s_blocksize = get_hardblocksize(sb->s_dev);
        sb->s_blocksize = sb->s_blocksize ? sb->s_blocksize : 2048;
        if (bsize > sb->s_blocksize)
                sb->s_blocksize = bsize;

        /* Block size must be an even multiple of 512 */
        switch (sb->s_blocksize) {
                case 512: sb->s_blocksize_bits = 9;     break;
                case 1024: sb->s_blocksize_bits = 10; break;
                case 2048: sb->s_blocksize_bits = 11; break;
                case 4096: sb->s_blocksize_bits = 12; break;
                case 8192: sb->s_blocksize_bits = 13; break;
                default:
                {
                        udf_debug("Bad block size (%ld)\n", sb->s_blocksize);
                        printk(KERN_ERR "udf: bad block size (%ld)\n", sb->s_blocksize);
                        return 0;
                }
        }

        /* Set the block size */
        set_blocksize(sb->s_dev, sb->s_blocksize);
        return sb->s_blocksize;
}

static int
udf_vrs(struct super_block *sb, int silent)
{
        struct VolStructDesc *vsd = NULL;
        int sector = 32768;
        struct buffer_head *bh = NULL;
        int iso9660=0;
        int nsr02=0;
        int nsr03=0;

        /* Block size must be a multiple of 512 */
        if (sb->s_blocksize & 511)
                return sector;

        sector += (UDF_SB_SESSION(sb) << sb->s_blocksize_bits);

        udf_debug("Starting at sector %u (%ld byte sectors)\n",
                (sector >> sb->s_blocksize_bits), sb->s_blocksize);
        /* Process the sequence (if applicable) */
        for (;!nsr02 && !nsr03; sector += 2048)
        {
                /* Read a block */
                bh = udf_tread(sb, sector >> sb->s_blocksize_bits, 2048);
                if (!bh)
                        break;

                /* Look for ISO  descriptors */
                vsd = (struct VolStructDesc *)(bh->b_data +
                        (sector & (sb->s_blocksize - 1)));

                if (vsd->stdIdent[0] == 0)
                {
                        udf_release_data(bh);
                        break;
                }
                else if (!strncmp(vsd->stdIdent, STD_ID_CD001, STD_ID_LEN))
                {
                        iso9660 = sector;
                        switch (vsd->structType)
                        {
                                case 0: 
                                        udf_debug("ISO9660 Boot Record found\n");
                                        break;
                                case 1: 
                                        udf_debug("ISO9660 Primary Volume Descriptor found\n");
                                        break;
                                case 2: 
                                        udf_debug("ISO9660 Supplementary Volume Descriptor found\n");
                                        break;
                                case 3: 
                                        udf_debug("ISO9660 Volume Partition Descriptor found\n");
                                        break;
                                case 255: 
                                        udf_debug("ISO9660 Volume Descriptor Set Terminator found\n");
                                        break;
                                default: 
                                        udf_debug("ISO9660 VRS (%u) found\n", vsd->structType);
                                        break;
                        }
                }
                else if (!strncmp(vsd->stdIdent, STD_ID_BEA01, STD_ID_LEN))
                {
                }
                else if (!strncmp(vsd->stdIdent, STD_ID_TEA01, STD_ID_LEN))
                {
                        udf_release_data(bh);
                        break;
                }
                else if (!strncmp(vsd->stdIdent, STD_ID_NSR02, STD_ID_LEN))
                {
                        nsr02 = sector;
                }
                else if (!strncmp(vsd->stdIdent, STD_ID_NSR03, STD_ID_LEN))
                {
                        nsr03 = sector;
                }
                udf_release_data(bh);
        }

        if (nsr03)
                return nsr03;
        else if (nsr02)
                return nsr02;
        else if (sector - (UDF_SB_SESSION(sb) << sb->s_blocksize_bits) == 32768)
                return -1;
        else
                return 0;
}

/*
 * udf_find_anchor
 *
 * PURPOSE
 *      Find an anchor volume descriptor.
 *
 * PRE-CONDITIONS
 *      sb                      Pointer to _locked_ superblock.
 *      lastblock               Last block on media.
 *
 * POST-CONDITIONS
 *      <return>                1 if not found, 0 if ok
 *
 * HISTORY
 *      July 1, 1997 - Andrew E. Mileski
 *      Written, tested, and released.
 */
static int
udf_find_anchor(struct super_block *sb, int useranchor, int lastblock)
{
        int varlastblock = udf_variable_to_fixed(lastblock);
        int last[] =  { lastblock, lastblock - 2,
                                        lastblock - 150, lastblock - 152,
                                        varlastblock, varlastblock - 2,
                                        varlastblock - 150, varlastblock - 152 };
        struct buffer_head *bh = NULL;
        Uint16 ident;
        Uint32 location;
        int i;

        UDF_SB_ANCHOR(sb)[0] = 0;
        UDF_SB_ANCHOR(sb)[1] = 0;
        UDF_SB_ANCHOR(sb)[2] = 0;
        UDF_SB_ANCHOR(sb)[3] = 256 + UDF_SB_SESSION(sb);

        lastblock = 0;

        /* Search for an anchor volume descriptor pointer */

        /*  according to spec, anchor is in either:
         *     block 256
         *     lastblock-256
         *     lastblock
         *  however, if the disc isn't closed, it could be 512 */

        for (i=0; (!lastblock && i<sizeof(last)/sizeof(int)); i++)
        {
                if (!(bh = bread(sb->s_dev, last[i], sb->s_blocksize)))
                {
                        ident = location = 0;
                }
                else
                {
                        ident = le16_to_cpu(((tag *)bh->b_data)->tagIdent);
                        location = le32_to_cpu(((tag *)bh->b_data)->tagLocation);
                        udf_release_data(bh);
                }

                if (ident == TID_ANCHOR_VOL_DESC_PTR)
                {
                        if (location == last[i] - UDF_SB_SESSION(sb))
                        {
                                lastblock = UDF_SB_ANCHOR(sb)[0] = last[i];
                                UDF_SB_ANCHOR(sb)[1] = last[i] - 256;
                        }
                        else if (location == udf_variable_to_fixed(last[i]) - UDF_SB_SESSION(sb))
                        {
                                UDF_SB(sb)->s_flags |= UDF_FLAG_VARCONV;
                                lastblock = UDF_SB_ANCHOR(sb)[0] = udf_variable_to_fixed(last[i]);
                                UDF_SB_ANCHOR(sb)[1] = lastblock - 256;
                        }
                        else
                                udf_debug("Anchor found at block %d, location mismatch %d.\n",
                                        last[i], location);
                }
                else if (ident == TID_FILE_ENTRY || ident == TID_EXTENDED_FILE_ENTRY)
                {
                        lastblock = last[i];
                        UDF_SB_ANCHOR(sb)[2] = 512 + UDF_SB_SESSION(sb);
                }
                else
                {
                        if (!(bh = bread(sb->s_dev, last[i] - 256, sb->s_blocksize)))
                        {
                                ident = location = 0;
                        }
                        else
                        {
                                ident = le16_to_cpu(((tag *)bh->b_data)->tagIdent);
                                location = le32_to_cpu(((tag *)bh->b_data)->tagLocation);
                                udf_release_data(bh);
                        }

                        if (ident == TID_ANCHOR_VOL_DESC_PTR &&
                                location == last[i] - 256 - UDF_SB_SESSION(sb))
                        {
                                lastblock = last[i];
                                UDF_SB_ANCHOR(sb)[1] = last[i] - 256;
                        }
                        else
                        {
                                if (!(bh = bread(sb->s_dev, last[i] - 312 - UDF_SB_SESSION(sb),
                                        sb->s_blocksize)))
                                {
                                        ident = location = 0;
                                }
                                else
                                {
                                        ident = le16_to_cpu(((tag *)bh->b_data)->tagIdent);
                                        location = le32_to_cpu(((tag *)bh->b_data)->tagLocation);
                                        udf_release_data(bh);
                                }

                                if (ident == TID_ANCHOR_VOL_DESC_PTR &&
                                        location == udf_variable_to_fixed(last[i]) - 256)
                                {
                                        UDF_SB(sb)->s_flags |= UDF_FLAG_VARCONV;
                                        lastblock = udf_variable_to_fixed(last[i]);
                                        UDF_SB_ANCHOR(sb)[1] = lastblock - 256;
                                }
                        }
                }
        }

        if (!lastblock)
        {
                /* We havn't found the lastblock. check 312 */
                if ((bh = bread(sb->s_dev, 312 + UDF_SB_SESSION(sb), sb->s_blocksize)))
                {
                        ident = le16_to_cpu(((tag *)bh->b_data)->tagIdent);
                        location = le32_to_cpu(((tag *)bh->b_data)->tagLocation);
                        udf_release_data(bh);

                        if (ident == TID_ANCHOR_VOL_DESC_PTR && location == 256)
                                UDF_SB(sb)->s_flags |= UDF_FLAG_VARCONV;
                }
        }

        for (i=0; i<sizeof(UDF_SB_ANCHOR(sb))/sizeof(int); i++)
        {
                if (UDF_SB_ANCHOR(sb)[i])
                {
                        if (!(bh = udf_read_tagged(sb,
                                UDF_SB_ANCHOR(sb)[i], UDF_SB_ANCHOR(sb)[i], &ident)))
                        {
                                UDF_SB_ANCHOR(sb)[i] = 0;
                        }
                        else
                        {
                                udf_release_data(bh);
                                if ((ident != TID_ANCHOR_VOL_DESC_PTR) && (i ||
                                        (ident != TID_FILE_ENTRY && ident != TID_EXTENDED_FILE_ENTRY)))
                                {
                                        UDF_SB_ANCHOR(sb)[i] = 0;
                                }
                        }
                }
                else if (useranchor != 0xFFFFFFFF)
                {
                        UDF_SB_ANCHOR(sb)[i] = useranchor;
                        useranchor = 0xFFFFFFFF;
                        i --;
                }
        }

        return lastblock;
}

static int 
udf_find_fileset(struct super_block *sb, lb_addr *fileset, lb_addr *root)
{
        struct buffer_head *bh = NULL;
        long lastblock;
        Uint16 ident;

        if (fileset->logicalBlockNum != 0xFFFFFFFF ||
                fileset->partitionReferenceNum != 0xFFFF)
        {
                bh = udf_read_ptagged(sb, *fileset, 0, &ident);

                if (!bh)
                        return 1;
                else if (ident != TID_FILE_SET_DESC)
                {
                        udf_release_data(bh);
                        return 1;
                }
                        
        }

        if (!bh) /* Search backwards through the partitions */
        {
                lb_addr newfileset;

                return 1;
                
                for (newfileset.partitionReferenceNum=UDF_SB_NUMPARTS(sb)-1;
                        (newfileset.partitionReferenceNum != 0xFFFF &&
                                fileset->logicalBlockNum == 0xFFFFFFFF &&
                                fileset->partitionReferenceNum == 0xFFFF);
                        newfileset.partitionReferenceNum--)
                {
                        lastblock = UDF_SB_PARTLEN(sb, newfileset.partitionReferenceNum);
                        newfileset.logicalBlockNum = 0;

                        do
                        {
                                bh = udf_read_ptagged(sb, newfileset, 0, &ident);
                                if (!bh)
                                {
                                        newfileset.logicalBlockNum ++;
                                        continue;
                                }

                                switch (ident)
                                {
                                        case TID_SPACE_BITMAP_DESC:
                                        {
                                                struct SpaceBitmapDesc *sp;
                                                sp = (struct SpaceBitmapDesc *)bh->b_data;
                                                newfileset.logicalBlockNum += 1 +
                                                        ((le32_to_cpu(sp->numOfBytes) + sizeof(struct SpaceBitmapDesc) - 1)
                                                                >> sb->s_blocksize_bits);
                                                udf_release_data(bh);
                                                break;
                                        }
                                        case TID_FILE_SET_DESC:
                                        {
                                                *fileset = newfileset;
                                                break;
                                        }
                                        default:
                                        {
                                                newfileset.logicalBlockNum ++;
                                                udf_release_data(bh);
                                                bh = NULL;
                                                break;
                                        }
                                }
                        }
                        while (newfileset.logicalBlockNum < lastblock &&
                                fileset->logicalBlockNum == 0xFFFFFFFF &&
                                fileset->partitionReferenceNum == 0xFFFF);
                }
        }

        if ((fileset->logicalBlockNum != 0xFFFFFFFF ||
                fileset->partitionReferenceNum != 0xFFFF) && bh)
        {
                udf_debug("Fileset at block=%d, partition=%d\n",
                        fileset->logicalBlockNum, fileset->partitionReferenceNum);

                UDF_SB_PARTITION(sb) = fileset->partitionReferenceNum;
                udf_load_fileset(sb, bh, root);
                udf_release_data(bh);
                return 0;
        }
        return 1;
}

static void 
udf_load_pvoldesc(struct super_block *sb, struct buffer_head *bh)
{
        struct PrimaryVolDesc *pvoldesc;
        time_t recording;
        long recording_usec;
        struct ustr instr;
        struct ustr outstr;

        pvoldesc = (struct PrimaryVolDesc *)bh->b_data;

        if ( udf_stamp_to_time(&recording, &recording_usec,
                lets_to_cpu(pvoldesc->recordingDateAndTime)) )
        {
            timestamp ts;
            ts = lets_to_cpu(pvoldesc->recordingDateAndTime);
                udf_debug("recording time %ld/%ld, %04u/%02u/%02u %02u:%02u (%x)\n",
                        recording, recording_usec,
                        ts.year, ts.month, ts.day, ts.hour, ts.minute, ts.typeAndTimezone);
            UDF_SB_RECORDTIME(sb) = recording;
        }

        if ( !udf_build_ustr(&instr, pvoldesc->volIdent, 32) )
        {
                if (!udf_CS0toUTF8(&outstr, &instr))
                {
                        udf_debug("volIdent[] = '%s'\n", outstr.u_name);
                        strncpy( UDF_SB_VOLIDENT(sb), outstr.u_name, outstr.u_len);
                }
        }

        if ( !udf_build_ustr(&instr, pvoldesc->volSetIdent, 128) )
        {
                if (!udf_CS0toUTF8(&outstr, &instr))
                        udf_debug("volSetIdent[] = '%s'\n", outstr.u_name);
        }
}

static void 
udf_load_fileset(struct super_block *sb, struct buffer_head *bh, lb_addr *root)
{
        struct FileSetDesc *fset;

        fset = (struct FileSetDesc *)bh->b_data;

        *root = lelb_to_cpu(fset->rootDirectoryICB.extLocation);

        UDF_SB_SERIALNUM(sb) = le16_to_cpu(fset->descTag.tagSerialNum);

        udf_debug("Rootdir at block=%d, partition=%d\n", 
                root->logicalBlockNum, root->partitionReferenceNum);
}

static void 
udf_load_partdesc(struct super_block *sb, struct buffer_head *bh)
{
        struct PartitionDesc *p;
        int i;

        p=(struct PartitionDesc *)bh->b_data;

        for (i=0; i<UDF_SB_NUMPARTS(sb); i++)
        {
                udf_debug("Searching map: (%d == %d)\n", 
                        UDF_SB_PARTMAPS(sb)[i].s_partition_num, le16_to_cpu(p->partitionNumber));
                if (UDF_SB_PARTMAPS(sb)[i].s_partition_num == le16_to_cpu(p->partitionNumber))
                {
                        UDF_SB_PARTLEN(sb,i) = le32_to_cpu(p->partitionLength); /* blocks */
                        UDF_SB_PARTROOT(sb,i) = le32_to_cpu(p->partitionStartingLocation) + UDF_SB_SESSION(sb);
                        UDF_SB_PARTMAPS(sb)[i].s_uspace_bitmap = 0xFFFFFFFF;

                        if (!strcmp(p->partitionContents.ident, PARTITION_CONTENTS_NSR02) ||
                                !strcmp(p->partitionContents.ident, PARTITION_CONTENTS_NSR03))
                        {
                                struct PartitionHeaderDesc *phd;

                                phd = (struct PartitionHeaderDesc *)(p->partitionContentsUse);
                                if (phd->unallocatedSpaceTable.extLength)
                                        udf_debug("unallocatedSpaceTable (part %d)\n", i);
                                if (phd->unallocatedSpaceBitmap.extLength)
                                {
                                        UDF_SB_PARTMAPS(sb)[i].s_uspace_bitmap =
                                                le32_to_cpu(phd->unallocatedSpaceBitmap.extPosition);
                                        udf_debug("unallocatedSpaceBitmap (part %d) @ %d\n",
                                                i, UDF_SB_PARTMAPS(sb)[i].s_uspace_bitmap);
                                }
                                if (phd->partitionIntegrityTable.extLength)
                                        udf_debug("partitionIntegrityTable (part %d)\n", i);
                                if (phd->freedSpaceTable.extLength)
                                        udf_debug("freedSpaceTable (part %d)\n", i);
                                if (phd->freedSpaceBitmap.extLength)
                                        udf_debug("freedSpaceBitmap (part %d\n", i);
                        }
                        break;
                }
        }
        if (i == UDF_SB_NUMPARTS(sb))
        {
                udf_debug("Partition (%d) not found in partition map\n", le16_to_cpu(p->partitionNumber));
        }
        else
        {
                udf_debug("Partition (%d:%d type %x) starts at physical %d, block length %d\n",
                        le16_to_cpu(p->partitionNumber), i, UDF_SB_PARTTYPE(sb,i),
                        UDF_SB_PARTROOT(sb,i), UDF_SB_PARTLEN(sb,i));
        }
}

static int 
udf_load_logicalvol(struct super_block *sb, struct buffer_head * bh, lb_addr *fileset)
{
        struct LogicalVolDesc *lvd;
        int i, offset;
        Uint8 type;

        lvd = (struct LogicalVolDesc *)bh->b_data;

        UDF_SB_NUMPARTS(sb) = le32_to_cpu(lvd->numPartitionMaps);
        UDF_SB_ALLOC_PARTMAPS(sb, UDF_SB_NUMPARTS(sb));

        for (i=0,offset=0;
                 i<UDF_SB_NUMPARTS(sb) && offset<le32_to_cpu(lvd->mapTableLength);
                 i++,offset+=((struct GenericPartitionMap *)&(lvd->partitionMaps[offset]))->partitionMapLength)
        {
                type = ((struct GenericPartitionMap *)&(lvd->partitionMaps[offset]))->partitionMapType;
                udf_debug("Partition (%d) type %d\n", i, type);
                if (type == 1)
                {
                        struct GenericPartitionMap1 *gpm1 = (struct GenericPartitionMap1 *)&(lvd->partitionMaps[offset]);
                        UDF_SB_PARTTYPE(sb,i) = UDF_TYPE1_MAP15;
                        UDF_SB_PARTVSN(sb,i) = le16_to_cpu(gpm1->volSeqNum);
                        UDF_SB_PARTNUM(sb,i) = le16_to_cpu(gpm1->partitionNum);
                }
                else if (type == 2)
                {
                        struct UdfPartitionMap2 *upm2 = (struct UdfPartitionMap2 *)&(lvd->partitionMaps[offset]);
                        if (!strncmp(upm2->partIdent.ident, UDF_ID_VIRTUAL, strlen(UDF_ID_VIRTUAL)))
                        {
                                if (le16_to_cpu(((Uint16 *)upm2->partIdent.identSuffix)[0]) == 0x0150)
                                        UDF_SB_PARTTYPE(sb,i) = UDF_VIRTUAL_MAP15;
                                else if (le16_to_cpu(((Uint16 *)upm2->partIdent.identSuffix)[0]) == 0x0200)
                                        UDF_SB_PARTTYPE(sb,i) = UDF_VIRTUAL_MAP20;
                        }
                        else if (!strncmp(upm2->partIdent.ident, UDF_ID_SPARABLE, strlen(UDF_ID_SPARABLE)))
                        {
                                struct SparablePartitionMap *spm = (struct SparablePartitionMap *)&(lvd->partitionMaps[offset]);
                                UDF_SB_PARTTYPE(sb,i) = UDF_SPARABLE_MAP15;
                                UDF_SB_TYPESPAR(sb,i).s_spar_plen = le16_to_cpu(spm->packetLength);
                                UDF_SB_TYPESPAR(sb,i).s_spar_loc = le32_to_cpu(spm->locSparingTable[0]);
                        }
                        else
                        {
                                udf_debug("Unknown ident: %s\n", upm2->partIdent.ident);
                                continue;
                        }
                        UDF_SB_PARTVSN(sb,i) = le16_to_cpu(upm2->volSeqNum);
                        UDF_SB_PARTNUM(sb,i) = le16_to_cpu(upm2->partitionNum);
                }
        }

        if (fileset)
        {
                long_ad *la = (long_ad *)&(lvd->logicalVolContentsUse[0]);

                *fileset = lelb_to_cpu(la->extLocation);
                udf_debug("FileSet found in LogicalVolDesc at block=%d, partition=%d\n",
                        fileset->logicalBlockNum,
                        fileset->partitionReferenceNum);
        }
        if (lvd->integritySeqExt.extLength)
                udf_load_logicalvolint(sb, leea_to_cpu(lvd->integritySeqExt));
        return 0;
}

/*
 * udf_load_logicalvolint
 *
 */
static void
udf_load_logicalvolint(struct super_block *sb, extent_ad loc)
{
        struct buffer_head *bh = NULL;
        Uint16 ident;

        while ((bh = udf_read_tagged(sb, loc.extLocation, loc.extLocation, &ident)) &&
                ident == TID_LOGICAL_VOL_INTEGRITY_DESC && loc.extLength > 0)
        {
                UDF_SB_LVIDBH(sb) = bh;
                
                if (UDF_SB_LVID(sb)->nextIntegrityExt.extLength)
                        udf_load_logicalvolint(sb, leea_to_cpu(UDF_SB_LVID(sb)->nextIntegrityExt));
                
                if (UDF_SB_LVIDBH(sb) != bh)
                        udf_release_data(bh);
                loc.extLength -= sb->s_blocksize;
                loc.extLocation ++;
        }
        if (UDF_SB_LVIDBH(sb) != bh)
                udf_release_data(bh);
}

/*
 * udf_process_sequence
 *
 * PURPOSE
 *      Process a main/reserve volume descriptor sequence.
 *
 * PRE-CONDITIONS
 *      sb                      Pointer to _locked_ superblock.
 *      block                   First block of first extent of the sequence.
 *      lastblock               Lastblock of first extent of the sequence.
 *
 * HISTORY
 *      July 1, 1997 - Andrew E. Mileski
 *      Written, tested, and released.
 */
static  int
udf_process_sequence(struct super_block *sb, long block, long lastblock, lb_addr *fileset)
{
        struct buffer_head *bh = NULL;
        struct udf_vds_record vds[VDS_POS_LENGTH];
        struct GenericDesc *gd;
        int done=0;
        int i,j;
        Uint32 vdsn;
        Uint16 ident;

        memset(vds, 0, sizeof(struct udf_vds_record) * VDS_POS_LENGTH);

        /* Read the main descriptor sequence */
        for (;(!done && block <= lastblock); block++)
        {

                bh = udf_read_tagged(sb, block, block, &ident);
                if (!bh) 
                        break;

                /* Process each descriptor (ISO 13346 3/8.3-8.4) */
                gd = (struct GenericDesc *)bh->b_data;
                vdsn = le32_to_cpu(gd->volDescSeqNum);
                switch (ident)
                {
                        case TID_PRIMARY_VOL_DESC: /* ISO 13346 3/10.1 */
                                if (vdsn >= vds[VDS_POS_PRIMARY_VOL_DESC].volDescSeqNum)
                                {
                                        vds[VDS_POS_PRIMARY_VOL_DESC].volDescSeqNum = vdsn;
                                        vds[VDS_POS_PRIMARY_VOL_DESC].block = block;
                                }
                                break;
                        case TID_VOL_DESC_PTR: /* ISO 13346 3/10.3 */
                                if (vdsn >= vds[VDS_POS_VOL_DESC_PTR].volDescSeqNum)
                                {
                                        vds[VDS_POS_VOL_DESC_PTR].volDescSeqNum = vdsn;
                                        vds[VDS_POS_VOL_DESC_PTR].block = block;
                                }
                                break;
                        case TID_IMP_USE_VOL_DESC: /* ISO 13346 3/10.4 */
                                if (vdsn >= vds[VDS_POS_IMP_USE_VOL_DESC].volDescSeqNum)
                                {
                                        vds[VDS_POS_IMP_USE_VOL_DESC].volDescSeqNum = vdsn;
                                        vds[VDS_POS_IMP_USE_VOL_DESC].block = block;
                                }
                                break;
                        case TID_PARTITION_DESC: /* ISO 13346 3/10.5 */
                                if (!vds[VDS_POS_PARTITION_DESC].block)
                                        vds[VDS_POS_PARTITION_DESC].block = block;
                                break;
                        case TID_LOGICAL_VOL_DESC: /* ISO 13346 3/10.6 */
                                if (vdsn >= vds[VDS_POS_LOGICAL_VOL_DESC].volDescSeqNum)
                                {
                                        vds[VDS_POS_LOGICAL_VOL_DESC].volDescSeqNum = vdsn;
                                        vds[VDS_POS_LOGICAL_VOL_DESC].block = block;
                                }
                                break;
                        case TID_UNALLOC_SPACE_DESC: /* ISO 13346 3/10.8 */
                                if (vdsn >= vds[VDS_POS_UNALLOC_SPACE_DESC].volDescSeqNum)
                                {
                                        vds[VDS_POS_UNALLOC_SPACE_DESC].volDescSeqNum = vdsn;
                                        vds[VDS_POS_UNALLOC_SPACE_DESC].block = block;
                                }
                                break;
                        case TID_TERMINATING_DESC: /* ISO 13346 3/10.9 */
                                vds[VDS_POS_TERMINATING_DESC].block = block;
                                done = 1;
                                break;
                }
                udf_release_data(bh);
        }
        for (i=0; i<VDS_POS_LENGTH; i++)
        {
                if (vds[i].block)
                {
                        bh = udf_read_tagged(sb, vds[i].block, vds[i].block, &ident);

                        if (i == VDS_POS_PRIMARY_VOL_DESC)
                                udf_load_pvoldesc(sb, bh);
                        else if (i == VDS_POS_LOGICAL_VOL_DESC)
                                udf_load_logicalvol(sb, bh, fileset);
                        else if (i == VDS_POS_PARTITION_DESC)
                        {
                                struct buffer_head *bh2 = NULL;
                                udf_load_partdesc(sb, bh);
                                for (j=vds[i].block+1; j<vds[VDS_POS_TERMINATING_DESC].block; j++)
                                {
                                        bh2 = udf_read_tagged(sb, j, j, &ident);
                                        gd = (struct GenericDesc *)bh2->b_data;
                                        if (ident == TID_PARTITION_DESC)
                                                udf_load_partdesc(sb, bh2);
                                        udf_release_data(bh2);
                                }
                        }
                        udf_release_data(bh);
                }
        }

        return 0;
}

/*
 * udf_check_valid()
 */
static int
udf_check_valid(struct super_block *sb, int novrs, int silent)
{
        long block;

        if (novrs)
        {
                udf_debug("Validity check skipped because of novrs option\n");
                return 0;
        }
        /* Check that it is NSR02 compliant */
        /* Process any "CD-ROM Volume Descriptor Set" (ECMA 167 2/8.3.1) */
        else if ((block = udf_vrs(sb, silent)) == -1)
        {
                udf_debug("Failed to read byte 32768. Assuming open disc. Skipping validity check\n");
                return 0;
        }
        else 
                return !block;
}

static int
udf_load_partition(struct super_block *sb, lb_addr *fileset)
{
        struct AnchorVolDescPtr *anchor;
        Uint16 ident;
        struct buffer_head *bh;
        long main_s, main_e, reserve_s, reserve_e;
        int i;

        if (!sb)
            return 1;

        for (i=0; i<sizeof(UDF_SB_ANCHOR(sb))/sizeof(int); i++)
        {
                if (UDF_SB_ANCHOR(sb)[i] && (bh = udf_read_tagged(sb,
                        UDF_SB_ANCHOR(sb)[i], UDF_SB_ANCHOR(sb)[i] - UDF_SB_SESSION(sb), &ident)))
                {
                        anchor = (struct AnchorVolDescPtr *)bh->b_data;

                        /* Locate the main sequence */
                        main_s = le32_to_cpu( anchor->mainVolDescSeqExt.extLocation );
                        main_e = le32_to_cpu( anchor->mainVolDescSeqExt.extLength );
                        main_e = main_e >> sb->s_blocksize_bits;
                        main_e += main_s;
        
                        /* Locate the reserve sequence */
                        reserve_s = le32_to_cpu(anchor->reserveVolDescSeqExt.extLocation);
                        reserve_e = le32_to_cpu(anchor->reserveVolDescSeqExt.extLength);
                        reserve_e = reserve_e >> sb->s_blocksize_bits;
                        reserve_e += reserve_s;

                        udf_release_data(bh);

                        /* Process the main & reserve sequences */
                        /* responsible for finding the PartitionDesc(s) */
                        if (!(udf_process_sequence(sb, main_s, main_e, fileset) &&
                                udf_process_sequence(sb, reserve_s, reserve_e, fileset)))
                        {
                                break;
                        }
                }
        }

        if (i == sizeof(UDF_SB_ANCHOR(sb))/sizeof(int))
        {
                udf_debug("No Anchor block found\n");
                return 1;
        }
        else
                udf_debug("Using anchor in block %d\n", UDF_SB_ANCHOR(sb)[i]);

        for (i=0; i<UDF_SB_NUMPARTS(sb); i++)
        {
                switch UDF_SB_PARTTYPE(sb, i)
                {
                        case UDF_VIRTUAL_MAP15:
                        case UDF_VIRTUAL_MAP20:
                        {
                                lb_addr ino;

                                if (!UDF_SB_LASTBLOCK(sb))
                                {
                                        udf_debug("Unable to determine Lastblock (For Virtual Partition)\n");
                                        return 1;
                                }

                                if (i == 0)
                                        ino.partitionReferenceNum = i+1;
                                else
                                        ino.partitionReferenceNum = i-1;

                                ino.logicalBlockNum = UDF_SB_LASTBLOCK(sb) - UDF_SB_PARTROOT(sb,ino.partitionReferenceNum);

                                if (!(UDF_SB_VAT(sb) = udf_iget(sb, ino)))
                                        return 1;

                                if (UDF_SB_PARTTYPE(sb,i) == UDF_VIRTUAL_MAP15)
                                {
                                        UDF_SB_TYPEVIRT(sb,i).s_start_offset = UDF_I_EXT0OFFS(UDF_SB_VAT(sb));
                                        UDF_SB_TYPEVIRT(sb,i).s_num_entries = (UDF_SB_VAT(sb)->i_size - 36) / sizeof(Uint32);
                                }
                                else if (UDF_SB_PARTTYPE(sb,i) == UDF_VIRTUAL_MAP20)
                                {
                                        struct buffer_head *bh = NULL;
                                        Uint32 pos;

                                        pos = udf_block_map(UDF_SB_VAT(sb), 0);
                                        bh = bread(sb->s_dev, pos, sb->s_blocksize);
                                        UDF_SB_TYPEVIRT(sb,i).s_start_offset =
                                                le16_to_cpu(((struct VirtualAllocationTable20 *)bh->b_data + UDF_I_EXT0OFFS(UDF_SB_VAT(sb)))->lengthHeader) +
                                                        UDF_I_EXT0OFFS(UDF_SB_VAT(sb));
                                        UDF_SB_TYPEVIRT(sb,i).s_num_entries = (UDF_SB_VAT(sb)->i_size -
                                                UDF_SB_TYPEVIRT(sb,i).s_start_offset) / sizeof(Uint32);
                                        udf_release_data(bh);
                                }
                                UDF_SB_PARTROOT(sb,i) = udf_get_pblock(sb, 0, i, 0);
                                UDF_SB_PARTLEN(sb,i) = UDF_SB_PARTLEN(sb,ino.partitionReferenceNum);
                                UDF_SB_PARTMAPS(sb)[i].s_uspace_bitmap = 0xFFFFFFFF;
                        }
                }
        }
        return 0;
}

static void udf_open_lvid(struct super_block *sb)
{
#ifdef CONFIG_UDF_RW
        if (UDF_SB_LVIDBH(sb))
        {
                int i;
                timestamp cpu_time;

                UDF_SB_LVIDIU(sb)->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
                UDF_SB_LVIDIU(sb)->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
                if (udf_time_to_stamp(&cpu_time, CURRENT_TIME, CURRENT_UTIME))
                        UDF_SB_LVID(sb)->recordingDateAndTime = cpu_to_lets(cpu_time);
                UDF_SB_LVID(sb)->integrityType = INTEGRITY_TYPE_OPEN;

                UDF_SB_LVID(sb)->descTag.descCRC =
                        cpu_to_le16(udf_crc((char *)UDF_SB_LVID(sb) + sizeof(tag),
                        le16_to_cpu(UDF_SB_LVID(sb)->descTag.descCRCLength), 0));

                UDF_SB_LVID(sb)->descTag.tagChecksum = 0;
                for (i=0; i<16; i++)
                        if (i != 4)
                                UDF_SB_LVID(sb)->descTag.tagChecksum +=
                                        ((Uint8 *)&(UDF_SB_LVID(sb)->descTag))[i];

                mark_buffer_dirty(UDF_SB_LVIDBH(sb), 1);
        }
#endif
}

static void udf_close_lvid(struct super_block *sb)
{
#ifdef CONFIG_UDF_RW
        if (UDF_SB_LVIDBH(sb) &&
                UDF_SB_LVID(sb)->integrityType == INTEGRITY_TYPE_OPEN)
        {
                int i;
                timestamp cpu_time;

                UDF_SB_LVIDIU(sb)->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
                UDF_SB_LVIDIU(sb)->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
                if (udf_time_to_stamp(&cpu_time, CURRENT_TIME, CURRENT_UTIME))
                        UDF_SB_LVID(sb)->recordingDateAndTime = cpu_to_lets(cpu_time);
                
                UDF_SB_LVID(sb)->integrityType = INTEGRITY_TYPE_CLOSE;

                UDF_SB_LVID(sb)->descTag.descCRC =
                        cpu_to_le16(udf_crc((char *)UDF_SB_LVID(sb) + sizeof(tag),
                        le16_to_cpu(UDF_SB_LVID(sb)->descTag.descCRCLength), 0));

                UDF_SB_LVID(sb)->descTag.tagChecksum = 0;
                for (i=0; i<16; i++)
                        if (i != 4)
                                UDF_SB_LVID(sb)->descTag.tagChecksum +=
                                        ((Uint8 *)&(UDF_SB_LVID(sb)->descTag))[i];

                mark_buffer_dirty(UDF_SB_LVIDBH(sb), 1);
        }
#endif
}

/*
 * udf_read_super
 *
 * PURPOSE
 *      Complete the specified super block.
 *
 * PRE-CONDITIONS
 *      sb                      Pointer to superblock to complete - never NULL.
 *      sb->s_dev               Device to read suberblock from.
 *      options                 Pointer to mount options.
 *      silent                  Silent flag.
 *
 * HISTORY
 *      July 1, 1997 - Andrew E. Mileski
 *      Written, tested, and released.
 */
static struct super_block *
udf_read_super(struct super_block *sb, void *options, int silent)
{
        struct inode *inode=NULL;
        struct udf_options uopt;
        lb_addr rootdir, fileset;
        int i;

        uopt.flags = 0;
        uopt.uid = 0;
        uopt.gid = 0;
        uopt.umask = 0;
        uopt.utf8 = 0;

        /* Lock the module in memory (if applicable) */
        MOD_INC_USE_COUNT;

        lock_super(sb);

        UDF_SB_PARTMAPS(sb) = NULL;
        UDF_SB_LVIDBH(sb) = NULL;
        UDF_SB_VAT(sb) = NULL;

        if (!udf_parse_options((char *)options, &uopt))
                goto error_out;

        memset(UDF_SB_ANCHOR(sb), 0x00, sizeof(UDF_SB_ANCHOR(sb)));
        fileset.logicalBlockNum = 0xFFFFFFFF;
        fileset.partitionReferenceNum = 0xFFFF;
        UDF_SB_RECORDTIME(sb)=0;
        UDF_SB_VOLIDENT(sb)[0]=0;

        UDF_SB(sb)->s_flags = uopt.flags;
        UDF_SB(sb)->s_uid = uopt.uid;
        UDF_SB(sb)->s_gid = uopt.gid;
        UDF_SB(sb)->s_umask = uopt.umask;
        UDF_SB(sb)->s_utf8 = uopt.utf8;

        /* Set the block size for all transfers */
        if (!udf_set_blocksize(sb, uopt.blocksize))
                goto error_out;

        if ( uopt.session == 0xFFFFFFFF )
                UDF_SB_SESSION(sb) = udf_get_last_session(sb->s_dev);
        else
                UDF_SB_SESSION(sb) = uopt.session;

        udf_debug("Multi-session=%d\n", UDF_SB_SESSION(sb));

        if ( uopt.lastblock == 0xFFFFFFFF )
                UDF_SB_LASTBLOCK(sb) = udf_get_last_block(sb->s_dev, &(UDF_SB(sb)->s_flags));
        else
                UDF_SB_LASTBLOCK(sb) = uopt.lastblock;

        UDF_SB_LASTBLOCK(sb) = udf_find_anchor(sb, uopt.anchor, UDF_SB_LASTBLOCK(sb));

        udf_debug("Lastblock=%d\n", UDF_SB_LASTBLOCK(sb));

        if (udf_check_valid(sb, uopt.novrs, silent)) /* read volume recognition sequences */
        {
                udf_debug("No VRS found\n");
                goto error_out;
        }

        UDF_SB_CHARSET(sb) = NULL;

#ifdef CONFIG_NLS
        if (uopt.utf8 == 0)
        {
                char *p = uopt.iocharset ? uopt.iocharset : "iso8859-1";
                UDF_SB_CHARSET(sb) = load_nls(p);
                if (!UDF_SB_CHARSET(sb))
                        if (uopt.iocharset)
                                goto error_out;
                UDF_SB_CHARSET(sb) = load_nls_default();
        }
#endif

        /* Fill in the rest of the superblock */
        sb->s_op = &udf_sb_ops;
        sb->s_time = 0;
        sb->dq_op = NULL;
        sb->s_dirt = 0;
        sb->s_magic = UDF_SUPER_MAGIC;

        for (i=0; i<UDF_MAX_BLOCK_LOADED; i++)
        {
                UDF_SB_BLOCK_BITMAP_NUMBER(sb,i) = 0;
                UDF_SB_BLOCK_BITMAP(sb,i) = NULL;
        }
        UDF_SB_LOADED_BLOCK_BITMAPS(sb) = 0;

        if (udf_load_partition(sb, &fileset))
        {
                udf_debug("No partition found (1)\n");
                goto error_out;
        }

        if ( !UDF_SB_NUMPARTS(sb) )
        {
                udf_debug("No partition found (2)\n");
                goto error_out;
        }

        if ( udf_find_fileset(sb, &fileset, &rootdir) )
        {
                udf_debug("No fileset found\n");
                goto error_out;
        }

        if (!silent)
        {
                timestamp ts;
                udf_time_to_stamp(&ts, UDF_SB_RECORDTIME(sb), 0);
                udf_info("Mounting volume '%s', timestamp %04u/%02u/%02u %02u:%02u (%x)\n",
                        UDF_SB_VOLIDENT(sb), ts.year, ts.month, ts.day, ts.hour, ts.minute,
                        ts.typeAndTimezone);
        }
        if (!(sb->s_flags & MS_RDONLY))
                udf_open_lvid(sb);
        unlock_super(sb);

        /* Assign the root inode */
        /* assign inodes by physical block number */
        /* perhaps it's not extensible enough, but for now ... */
        inode = udf_iget(sb, rootdir); 
        if (!inode)
        {
                udf_debug("Error in udf_iget, block=%d, partition=%d\n",
                        rootdir.logicalBlockNum, rootdir.partitionReferenceNum);
                goto error_out;
        }

        /* Allocate a dentry for the root inode */
        sb->s_root = d_alloc_root(inode);
        if (!sb->s_root)
        {
                iput(inode);
                udf_debug("Couldn't allocate root dentry\n");
                goto error_out;
        }

        return sb;

error_out:
        sb->s_dev = NODEV;
        if (UDF_SB_VAT(sb))
                iput(UDF_SB_VAT(sb));
        if (!(sb->s_flags & MS_RDONLY))
                udf_close_lvid(sb);
        udf_release_data(UDF_SB_LVIDBH(sb));
        UDF_SB_FREE(sb);
        unlock_super(sb);
        MOD_DEC_USE_COUNT;
        return NULL;
}

void udf_error(struct super_block *sb, const char *function,
        const char *fmt, ...)
{
        va_list args;

        if (!(sb->s_flags & MS_RDONLY))
        {
                /* mark sb error */
                sb->s_dirt = 1;
        }
        va_start(args, fmt);
        vsprintf(error_buf, fmt, args);
        va_end(args);
        printk (KERN_CRIT "UDF-fs error (device %s): %s: %s\n",
                bdevname(sb->s_dev), function, error_buf);
}

void udf_warning(struct super_block *sb, const char *function,
        const char *fmt, ...)
{
        va_list args;

        va_start (args, fmt);
        vsprintf(error_buf, fmt, args);
        va_end(args);
        printk(KERN_WARNING "UDF-fs warning (device %s): %s: %s\n",
                bdevname(sb->s_dev), function, error_buf);
}

/*
 * udf_put_super
 *
 * PURPOSE
 *      Prepare for destruction of the superblock.
 *
 * DESCRIPTION
 *      Called before the filesystem is unmounted.
 *
 * HISTORY
 *      July 1, 1997 - Andrew E. Mileski
 *      Written, tested, and released.
 */
static void
udf_put_super(struct super_block *sb)
{
        int i;

        if (UDF_SB_VAT(sb))
                iput(UDF_SB_VAT(sb));
        if (!(sb->s_flags & MS_RDONLY))
                udf_close_lvid(sb);
        udf_release_data(UDF_SB_LVIDBH(sb));
        for (i=0; i<UDF_MAX_BLOCK_LOADED; i++)
                udf_release_data(UDF_SB_BLOCK_BITMAP(sb, i));
        UDF_SB_FREE(sb);

        MOD_DEC_USE_COUNT;
}

/*
 * udf_stat_fs
 *
 * PURPOSE
 *      Return info about the filesystem.
 *
 * DESCRIPTION
 *      Called by sys_statfs()
 *
 * HISTORY
 *      July 1, 1997 - Andrew E. Mileski
 *      Written, tested, and released.
 */
static int
udf_statfs(struct super_block *sb, struct statfs *buf, int bufsize)
{
        int size;
        struct statfs tmp;
        int rc;

        size = (bufsize < sizeof(tmp)) ? bufsize: sizeof(tmp);

        memset(&tmp, 0, sizeof(tmp));
        tmp.f_type = UDF_SUPER_MAGIC;
        tmp.f_bsize = sb->s_blocksize;
        tmp.f_blocks = UDF_SB_PARTLEN(sb, UDF_SB_PARTITION(sb));
        tmp.f_bfree = udf_count_free(sb);
        tmp.f_bavail = tmp.f_bfree;
        tmp.f_files = (UDF_SB_LVIDBH(sb) ?
                (le32_to_cpu(UDF_SB_LVIDIU(sb)->numFiles) +
                le32_to_cpu(UDF_SB_LVIDIU(sb)->numDirs)) : 0) + tmp.f_bfree;
        tmp.f_ffree = tmp.f_bfree;
        /* __kernel_fsid_t f_fsid */
        tmp.f_namelen = UDF_NAME_LEN;

        rc= copy_to_user(buf, &tmp, size) ? -EFAULT: 0;
        return rc;
}

static unsigned char udf_bitmap_lookup[16] = {
        0, 1, 1, 2, 1, 2, 2, 3, 1, 2, 2, 3, 2, 3, 3, 4
};
        
static unsigned int
udf_count_free(struct super_block *sb)
{
        struct buffer_head *bh = NULL;
        unsigned int accum=0;
        int index;
        int block=0, newblock;
        lb_addr loc;
        Uint32  bytes;
        Uint8   value;
        Uint8 * ptr;
        Uint16 ident;

        if (UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_uspace_bitmap == 0xFFFFFFFF)
        {
                if (UDF_SB_LVIDBH(sb))
                {
                        if (le32_to_cpu(UDF_SB_LVID(sb)->numOfPartitions) > UDF_SB_PARTITION(sb))
                                accum = le32_to_cpu(UDF_SB_LVID(sb)->freeSpaceTable[UDF_SB_PARTITION(sb)]);

                        if (accum == 0xFFFFFFFF)
                                accum = 0;

                        return accum;
                }
                else
                        return 0;
        }
        else
        {
                struct SpaceBitmapDesc *bm;
                loc.logicalBlockNum = UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_uspace_bitmap;
                loc.partitionReferenceNum = UDF_SB_PARTITION(sb);
                bh = udf_read_ptagged(sb, loc, 0, &ident);

                if (!bh)
                {
                        printk(KERN_ERR "udf: udf_count_free failed\n");
                        return 0;
                }
                else if (ident != TID_SPACE_BITMAP_DESC)
                {
                        udf_release_data(bh);
                        printk(KERN_ERR "udf: udf_count_free failed\n");
                        return 0;
                }

                bm = (struct SpaceBitmapDesc *)bh->b_data;
                bytes = bm->numOfBytes;
                index = sizeof(struct SpaceBitmapDesc); /* offset in first block only */
                ptr = (Uint8 *)bh->b_data;

                while ( bytes > 0 )
                {
                        while ((bytes > 0) && (index < sb->s_blocksize))
                        {
                                value = ptr[index];
                                accum += udf_bitmap_lookup[ value & 0x0f ];
                                accum += udf_bitmap_lookup[ value >> 4 ];
                                index++;
                                bytes--;
                        }
                        if ( bytes )
                        {
                                udf_release_data(bh);
                                newblock = udf_get_lb_pblock(sb, loc, ++block);
                                bh = udf_tread(sb, newblock, sb->s_blocksize);
                                if (!bh)
                                {
                                        udf_debug("read failed\n");
                                        return accum;
                                }
                                index = 0;
                                ptr = (Uint8 *)bh->b_data;
                        }
                }
                udf_release_data(bh);
                return accum;
        }
}