/*
   *  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 "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)
  {

  	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;

  	gid_t gid;
  	uid_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 = 0;
  	popt->uid = 0;
  	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 = option;

  			popt->uid_set = 1;

  			break;
  		case Opt_gid:
  			if (match_int(&args[0], &option))
  				return 0;
  			popt->gid = option;

  			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.
   *
   * emoenke@gwdg.de
   */
  #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
  ",
  				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
  ");

  	}
  	i = ioctl_by_bdev(bdev, CDROMMULTISESSION, (unsigned long) &ms_info);

  	if (session > 0)

  		printk(KERN_ERR "ISOFS: Invalid session number
  ");

  #if 0

  	printk(KERN_DEBUG "isofs.inode: CDROMMULTISESSION: rc=%d
  ",i);

  	if (i==0) {

  		printk(KERN_DEBUG "isofs.inode: XA disk: %s
  ",ms_info.xa_flag?"yes":"no");
  		printk(KERN_DEBUG "isofs.inode: vol_desc_start = %d
  ", 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
  ",
  							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
  ",
  		sbi->s_max_size, 1UL << sbi->s_log_zone_size);
  	printk(KERN_DEBUG "ISOFS: First datazone:%ld
  ", sbi->s_firstdatazone);

  	if(sbi->s_high_sierra)

  		printk(KERN_DEBUG "ISOFS: Disc in High Sierra format.
  ");

  #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
  ");
  			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?
  ");
  		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_alloc_root(inode);

  	if (!(s->s_root)) {
  		iput(inode);
  		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
  ", __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
  ",
  		__func__, s->s_id, iso_blknum, block);

  	goto out_freebh;

  out_bad_zone_size:

  	printk(KERN_WARNING "ISOFS: Bad logical zone size %ld
  ",

  		sbi->s_log_zone_size);
  	goto out_freebh;
  out_bad_size:

  	printk(KERN_WARNING "ISOFS: Logical zone size(%d) < hardware blocksize(%u)
  ",

  		orig_zonesize, opt.blocksize);
  	goto out_freebh;
  out_unknown_format:
  	if (!silent)

  		printk(KERN_WARNING "ISOFS: Unable to identify CD-ROM format.
  ");

  
  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
  ", __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)
  ",
  				__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...
  ", __func__);

  				printk(KERN_DEBUG "%s: block=%lu firstext=%u sect_size=%u "

  					"nextblk=%lu nextoff=%lu
  ", __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
  ", __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
  ", block);

  	kfree(tmpde);

  	return -EIO;
  
  out_toomany:

  	printk(KERN_INFO "%s: More than 100 file sections ?!?, aborting...
  "
  		"isofs_read_level3_size: inode=%lu
  ",
  		__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
  ", __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.
  ");

  		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).
  ",
  			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).
  ",
  			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
  ");

  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");