[net-next-2.6.git] / fs / isofs / isofs.h

#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_fmode;
	mode_t s_dmode;
	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 get_unaligned_le16(p);
}
static inline unsigned int isonum_722(char *p)
{
	return get_unaligned_be16(p);
}
static inline unsigned int isonum_723(char *p)
{
	/* Ignore bigendian datum due to broken mastering programs */
	return get_unaligned_le16(p);
}
static inline unsigned int isonum_731(char *p)
{
	return get_unaligned_le32(p);
}
static inline unsigned int isonum_732(char *p)
{
	return get_unaligned_be32(p);
}
static inline unsigned int isonum_733(char *p)
{
	/* Ignore bigendian datum due to broken mastering programs */
	return 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;
Commit	Line	Data
94f2f715 AV	1	#include <linux/fs.h>
94f2f715 AV	2	#include <linux/buffer_head.h>
a5694255	3	#include <linux/exportfs.h>
94f2f715 AV	4	#include <linux/iso_fs.h>
	5	#include <asm/unaligned.h>
	6
	7	enum isofs_file_format {
	8	isofs_file_normal = 0,
	9	isofs_file_sparse = 1,
	10	isofs_file_compressed = 2,
	11	};
	12
	13	/*
	14	* iso fs inode data in memory
	15	*/
	16	struct iso_inode_info {
	17	unsigned long i_iget5_block;
	18	unsigned long i_iget5_offset;
	19	unsigned int i_first_extent;
	20	unsigned char i_file_format;
	21	unsigned char i_format_parm[3];
	22	unsigned long i_next_section_block;
	23	unsigned long i_next_section_offset;
	24	off_t i_section_size;
	25	struct inode vfs_inode;
	26	};
	27
	28	/*
	29	* iso9660 super-block data in memory
	30	*/
	31	struct isofs_sb_info {
	32	unsigned long s_ninodes;
	33	unsigned long s_nzones;
	34	unsigned long s_firstdatazone;
	35	unsigned long s_log_zone_size;
	36	unsigned long s_max_size;
	37
	38	unsigned char s_high_sierra; /* A simple flag */
	39	unsigned char s_mapping;
	40	int s_rock_offset; /* offset of SUSP fields within SU area */
	41	unsigned char s_rock;
	42	unsigned char s_joliet_level;
	43	unsigned char s_utf8;
	44	unsigned char s_cruft; /* Broken disks with high
	45	byte of length containing
	46	junk */
	47	unsigned char s_unhide;
	48	unsigned char s_nosuid;
	49	unsigned char s_nodev;
	50	unsigned char s_nocompress;
9769f4eb JW	51	unsigned char s_hide;
9769f4eb JW	52	unsigned char s_showassoc;
94f2f715	53
9b7880e7 JK	54	mode_t s_fmode;
9b7880e7 JK	55	mode_t s_dmode;
94f2f715 AV	56	gid_t s_gid;
	57	uid_t s_uid;
	58	struct nls_table s_nls_iocharset; / Native language support table */
	59	};
	60
	61	static inline struct isofs_sb_info ISOFS_SB(struct super_block sb)
	62	{
	63	return sb->s_fs_info;
	64	}
	65
	66	static inline struct iso_inode_info ISOFS_I(struct inode inode)
	67	{
	68	return container_of(inode, struct iso_inode_info, vfs_inode);
	69	}
	70
	71	static inline int isonum_711(char *p)
	72	{
	73	return (u8 )p;
	74	}
	75	static inline int isonum_712(char *p)
	76	{
	77	return (s8 )p;
	78	}
	79	static inline unsigned int isonum_721(char *p)
	80	{
58d485d4	81	return get_unaligned_le16(p);
94f2f715 AV	82	}
	83	static inline unsigned int isonum_722(char *p)
	84	{
58d485d4	85	return get_unaligned_be16(p);
94f2f715 AV	86	}
	87	static inline unsigned int isonum_723(char *p)
	88	{
	89	/* Ignore bigendian datum due to broken mastering programs */
58d485d4	90	return get_unaligned_le16(p);
94f2f715 AV	91	}
	92	static inline unsigned int isonum_731(char *p)
	93	{
58d485d4	94	return get_unaligned_le32(p);
94f2f715 AV	95	}
	96	static inline unsigned int isonum_732(char *p)
	97	{
58d485d4	98	return get_unaligned_be32(p);
94f2f715 AV	99	}
	100	static inline unsigned int isonum_733(char *p)
	101	{
	102	/* Ignore bigendian datum due to broken mastering programs */
58d485d4	103	return get_unaligned_le32(p);
94f2f715 AV	104	}
	105	extern int iso_date(char *, int);
	106
	107	struct inode; /* To make gcc happy */
	108
	109	extern int parse_rock_ridge_inode(struct iso_directory_record , struct inode );
	110	extern int get_rock_ridge_filename(struct iso_directory_record , char , struct inode *);
	111	extern int isofs_name_translate(struct iso_directory_record , char , struct inode *);
	112
	113	int get_joliet_filename(struct iso_directory_record , unsigned char , struct inode *);
	114	int get_acorn_filename(struct iso_directory_record , char , struct inode *);
	115
	116	extern struct dentry isofs_lookup(struct inode , struct dentry , struct nameidata );
	117	extern struct buffer_head isofs_bread(struct inode , sector_t);
	118	extern int isofs_get_blocks(struct inode , sector_t, struct buffer_head *, unsigned long);
	119
	120	extern struct inode isofs_iget(struct super_block sb,
	121	unsigned long block,
	122	unsigned long offset);
	123
	124	/* Because the inode number is no longer relevant to finding the
	125	* underlying meta-data for an inode, we are free to choose a more
	126	* convenient 32-bit number as the inode number. The inode numbering
	127	* scheme was recommended by Sergey Vlasov and Eric Lammerts. */
	128	static inline unsigned long isofs_get_ino(unsigned long block,
	129	unsigned long offset,
	130	unsigned long bufbits)
	131	{
	132	return (block << (bufbits - 5)) \| (offset >> 5);
	133	}
	134
	135	/* Every directory can have many redundant directory entries scattered
	136	* throughout the directory tree. First there is the directory entry
	137	* with the name of the directory stored in the parent directory.
	138	* Then, there is the "." directory entry stored in the directory
	139	* itself. Finally, there are possibly many ".." directory entries
	140	* stored in all the subdirectories.
	141	*
	142	* In order for the NFS get_parent() method to work and for the
	143	* general consistency of the dcache, we need to make sure the
	144	* "i_iget5_block" and "i_iget5_offset" all point to exactly one of
	145	* the many redundant entries for each directory. We normalize the
	146	* block and offset by always making them point to the "." directory.
	147	*
	148	* Notice that we do not use the entry for the directory with the name
	149	* that is located in the parent directory. Even though choosing this
	150	* first directory is more natural, it is much easier to find the "."
	151	* entry in the NFS get_parent() method because it is implicitly
	152	* encoded in the "extent + ext_attr_length" fields of _all_ the
	153	* redundant entries for the directory. Thus, it can always be
	154	* reached regardless of which directory entry you have in hand.
	155	*
	156	* This works because the "." entry is simply the first directory
	157	* record when you start reading the file that holds all the directory
	158	* records, and this file starts at "extent + ext_attr_length" blocks.
	159	* Because the "." entry is always the first entry listed in the
	160	* directories file, the normalized "offset" value is always 0.
	161	*
	162	* You should pass the directory entry in "de". On return, "block"
	163	* and "offset" will hold normalized values. Only directories are
	164	* affected making it safe to call even for non-directory file
	165	* types. */
	166	static inline void
	167	isofs_normalize_block_and_offset(struct iso_directory_record* de,
168	unsigned long *block,
169	unsigned long *offset)
170	{
171	/* Only directories are normalized. */
172	if (de->flags[0] & 2) {
173	*offset = 0;
174	*block = (unsigned long)isonum_733(de->extent)
175	+ (unsigned long)isonum_711(de->ext_attr_length);
176	}
177	}
178
92e1d5be	179	extern const struct inode_operations isofs_dir_inode_operations;
4b6f5d20	180	extern const struct file_operations isofs_dir_operations;
f5e54d6e	181	extern const struct address_space_operations isofs_symlink_aops;
39655164	182	extern const struct export_operations isofs_export_ops;