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#include <linux/fs.h>

#include <linux/buffer_head.h>

#include <linux/exportfs.h>

#include <linux/iso_fs.h>

#include <asm/unaligned.h>

enum isofs_file_format {

        isofs_file_normal = 0,

        isofs_file_sparse = 1,

        isofs_file_compressed = 2,

};

/*

 * iso fs inode data in memory

 */

struct iso_inode_info {

        unsigned long i_iget5_block;

        unsigned long i_iget5_offset;

        unsigned int i_first_extent;

        unsigned char i_file_format;

        unsigned char i_format_parm[3];

        unsigned long i_next_section_block;

        unsigned long i_next_section_offset;

        off_t i_section_size;

        struct inode vfs_inode;

};

/*

 * iso9660 super-block data in memory

 */

struct isofs_sb_info {

        unsigned long s_ninodes;

        unsigned long s_nzones;

        unsigned long s_firstdatazone;

        unsigned long s_log_zone_size;

        unsigned long s_max_size;

        unsigned char s_high_sierra; /* A simple flag */

        unsigned char s_mapping;

        int           s_rock_offset; /* offset of SUSP fields within SU area */

        unsigned char s_rock;

        unsigned char s_joliet_level;

        unsigned char s_utf8;

        unsigned char s_cruft; /* Broken disks with high

                                  byte of length containing

                                  junk */

        unsigned char s_unhide;

        unsigned char s_nosuid;

        unsigned char s_nodev;

        unsigned char s_nocompress;

        unsigned char s_hide;

        unsigned char s_showassoc;

        mode_t s_mode;

        gid_t s_gid;

        uid_t s_uid;

        struct nls_table *s_nls_iocharset; /* Native language support table */

};

static inline struct isofs_sb_info *ISOFS_SB(struct super_block *sb)

{

        return sb->s_fs_info;

}

static inline struct iso_inode_info *ISOFS_I(struct inode *inode)

{

        return container_of(inode, struct iso_inode_info, vfs_inode);

}

static inline int isonum_711(char *p)

{

        return *(u8 *)p;

}

static inline int isonum_712(char *p)

{

        return *(s8 *)p;

}

static inline unsigned int isonum_721(char *p)

{

        return le16_to_cpu(get_unaligned((__le16 *)p));

}

static inline unsigned int isonum_722(char *p)

{

        return be16_to_cpu(get_unaligned((__le16 *)p));

}

static inline unsigned int isonum_723(char *p)

{

        /* Ignore bigendian datum due to broken mastering programs */

        return le16_to_cpu(get_unaligned((__le16 *)p));

}

static inline unsigned int isonum_731(char *p)

{

        return le32_to_cpu(get_unaligned((__le32 *)p));

}

static inline unsigned int isonum_732(char *p)

{

        return be32_to_cpu(get_unaligned((__le32 *)p));

}

static inline unsigned int isonum_733(char *p)

{

        /* Ignore bigendian datum due to broken mastering programs */

        return le32_to_cpu(get_unaligned((__le32 *)p));

}

extern int iso_date(char *, int);

struct inode;           /* To make gcc happy */

extern int parse_rock_ridge_inode(struct iso_directory_record *, struct inode *);

extern int get_rock_ridge_filename(struct iso_directory_record *, char *, struct inode *);

extern int isofs_name_translate(struct iso_directory_record *, char *, struct inode *);

int get_joliet_filename(struct iso_directory_record *, unsigned char *, struct inode *);

int get_acorn_filename(struct iso_directory_record *, char *, struct inode *);

extern struct dentry *isofs_lookup(struct inode *, struct dentry *, struct nameidata *);

extern struct buffer_head *isofs_bread(struct inode *, sector_t);

extern int isofs_get_blocks(struct inode *, sector_t, struct buffer_head **, unsigned long);

extern struct inode *isofs_iget(struct super_block *sb,

                                unsigned long block,

                                unsigned long offset);

/* Because the inode number is no longer relevant to finding the

 * underlying meta-data for an inode, we are free to choose a more

 * convenient 32-bit number as the inode number.  The inode numbering

 * scheme was recommended by Sergey Vlasov and Eric Lammerts. */

static inline unsigned long isofs_get_ino(unsigned long block,

                                          unsigned long offset,

                                          unsigned long bufbits)

{

        return (block << (bufbits - 5)) | (offset >> 5);

}

/* Every directory can have many redundant directory entries scattered

 * throughout the directory tree.  First there is the directory entry

 * with the name of the directory stored in the parent directory.

 * Then, there is the "." directory entry stored in the directory

 * itself.  Finally, there are possibly many ".." directory entries

 * stored in all the subdirectories.

 *

 * In order for the NFS get_parent() method to work and for the

 * general consistency of the dcache, we need to make sure the

 * "i_iget5_block" and "i_iget5_offset" all point to exactly one of

 * the many redundant entries for each directory.  We normalize the

 * block and offset by always making them point to the "."  directory.

 *

 * Notice that we do not use the entry for the directory with the name

 * that is located in the parent directory.  Even though choosing this

 * first directory is more natural, it is much easier to find the "."

 * entry in the NFS get_parent() method because it is implicitly

 * encoded in the "extent + ext_attr_length" fields of _all_ the

 * redundant entries for the directory.  Thus, it can always be

 * reached regardless of which directory entry you have in hand.

 *

 * This works because the "." entry is simply the first directory

 * record when you start reading the file that holds all the directory

 * records, and this file starts at "extent + ext_attr_length" blocks.

 * Because the "." entry is always the first entry listed in the

 * directories file, the normalized "offset" value is always 0.

 *

 * You should pass the directory entry in "de".  On return, "block"

 * and "offset" will hold normalized values.  Only directories are

 * affected making it safe to call even for non-directory file

 * types. */

static inline void

isofs_normalize_block_and_offset(struct iso_directory_record* de,

                                 unsigned long *block,

                                 unsigned long *offset)

{

        /* Only directories are normalized. */

        if (de->flags[0] & 2) {

                *offset = 0;

                *block = (unsigned long)isonum_733(de->extent)

                        + (unsigned long)isonum_711(de->ext_attr_length);

        }

}

extern const struct inode_operations isofs_dir_inode_operations;

extern const struct file_operations isofs_dir_operations;

extern const struct address_space_operations isofs_symlink_aops;

extern const struct export_operations isofs_export_ops;