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

#include <linux/fs.h>
#include <linux/buffer_head.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 struct inode_operations isofs_dir_inode_operations;
extern struct file_operations isofs_dir_operations;
extern struct address_space_operations isofs_symlink_aops;
extern struct export_operations isofs_export_ops;
Commit	Line	Data
94f2f715 AV	1	#include <linux/fs.h>
	2	#include <linux/buffer_head.h>
	3	#include <linux/iso_fs.h>
	4	#include <asm/unaligned.h>
	5
	6	enum isofs_file_format {
	7	isofs_file_normal = 0,
	8	isofs_file_sparse = 1,
	9	isofs_file_compressed = 2,
	10	};
	11
	12	/*
	13	* iso fs inode data in memory
	14	*/
	15	struct iso_inode_info {
	16	unsigned long i_iget5_block;
	17	unsigned long i_iget5_offset;
	18	unsigned int i_first_extent;
	19	unsigned char i_file_format;
	20	unsigned char i_format_parm[3];
	21	unsigned long i_next_section_block;
	22	unsigned long i_next_section_offset;
	23	off_t i_section_size;
	24	struct inode vfs_inode;
	25	};
	26
	27	/*
	28	* iso9660 super-block data in memory
	29	*/
	30	struct isofs_sb_info {
	31	unsigned long s_ninodes;
	32	unsigned long s_nzones;
	33	unsigned long s_firstdatazone;
	34	unsigned long s_log_zone_size;
	35	unsigned long s_max_size;
	36
	37	unsigned char s_high_sierra; /* A simple flag */
	38	unsigned char s_mapping;
	39	int s_rock_offset; /* offset of SUSP fields within SU area */
	40	unsigned char s_rock;
	41	unsigned char s_joliet_level;
	42	unsigned char s_utf8;
	43	unsigned char s_cruft; /* Broken disks with high
	44	byte of length containing
	45	junk */
	46	unsigned char s_unhide;
	47	unsigned char s_nosuid;
	48	unsigned char s_nodev;
	49	unsigned char s_nocompress;
9769f4eb JW	50	unsigned char s_hide;
9769f4eb JW	51	unsigned char s_showassoc;
94f2f715 AV	52
	53	mode_t s_mode;
	54	gid_t s_gid;
	55	uid_t s_uid;
	56	struct nls_table s_nls_iocharset; / Native language support table */
	57	};
	58
	59	static inline struct isofs_sb_info ISOFS_SB(struct super_block sb)
	60	{
	61	return sb->s_fs_info;
	62	}
	63
	64	static inline struct iso_inode_info ISOFS_I(struct inode inode)
	65	{
	66	return container_of(inode, struct iso_inode_info, vfs_inode);
	67	}
	68
	69	static inline int isonum_711(char *p)
	70	{
	71	return (u8 )p;
	72	}
	73	static inline int isonum_712(char *p)
	74	{
	75	return (s8 )p;
	76	}
	77	static inline unsigned int isonum_721(char *p)
	78	{
	79	return le16_to_cpu(get_unaligned((__le16 *)p));
	80	}
	81	static inline unsigned int isonum_722(char *p)
	82	{
	83	return be16_to_cpu(get_unaligned((__le16 *)p));
	84	}
	85	static inline unsigned int isonum_723(char *p)
	86	{
	87	/* Ignore bigendian datum due to broken mastering programs */
	88	return le16_to_cpu(get_unaligned((__le16 *)p));
	89	}
	90	static inline unsigned int isonum_731(char *p)
	91	{
	92	return le32_to_cpu(get_unaligned((__le32 *)p));
	93	}
	94	static inline unsigned int isonum_732(char *p)
	95	{
	96	return be32_to_cpu(get_unaligned((__le32 *)p));
	97	}
	98	static inline unsigned int isonum_733(char *p)
	99	{
	100	/* Ignore bigendian datum due to broken mastering programs */
	101	return le32_to_cpu(get_unaligned((__le32 *)p));
	102	}
	103	extern int iso_date(char *, int);
	104
	105	struct inode; /* To make gcc happy */
	106
	107	extern int parse_rock_ridge_inode(struct iso_directory_record , struct inode );
	108	extern int get_rock_ridge_filename(struct iso_directory_record , char , struct inode *);
	109	extern int isofs_name_translate(struct iso_directory_record , char , struct inode *);
	110
	111	int get_joliet_filename(struct iso_directory_record , unsigned char , struct inode *);
	112	int get_acorn_filename(struct iso_directory_record , char , struct inode *);
	113
	114	extern struct dentry isofs_lookup(struct inode , struct dentry , struct nameidata );
	115	extern struct buffer_head isofs_bread(struct inode , sector_t);
116	extern int isofs_get_blocks(struct inode , sector_t, struct buffer_head *, unsigned long);
117
118	extern struct inode isofs_iget(struct super_block sb,
119	unsigned long block,
120	unsigned long offset);
121
122	/* Because the inode number is no longer relevant to finding the
123	* underlying meta-data for an inode, we are free to choose a more
124	* convenient 32-bit number as the inode number. The inode numbering
125	* scheme was recommended by Sergey Vlasov and Eric Lammerts. */
126	static inline unsigned long isofs_get_ino(unsigned long block,
127	unsigned long offset,
128	unsigned long bufbits)
129	{
130	return (block << (bufbits - 5)) \| (offset >> 5);
131	}
132
133	/* Every directory can have many redundant directory entries scattered
134	* throughout the directory tree. First there is the directory entry
135	* with the name of the directory stored in the parent directory.
136	* Then, there is the "." directory entry stored in the directory
137	* itself. Finally, there are possibly many ".." directory entries
138	* stored in all the subdirectories.
139	*
140	* In order for the NFS get_parent() method to work and for the
141	* general consistency of the dcache, we need to make sure the
142	* "i_iget5_block" and "i_iget5_offset" all point to exactly one of
143	* the many redundant entries for each directory. We normalize the
144	* block and offset by always making them point to the "." directory.
145	*
146	* Notice that we do not use the entry for the directory with the name
147	* that is located in the parent directory. Even though choosing this
148	* first directory is more natural, it is much easier to find the "."
149	* entry in the NFS get_parent() method because it is implicitly
150	* encoded in the "extent + ext_attr_length" fields of _all_ the
151	* redundant entries for the directory. Thus, it can always be
152	* reached regardless of which directory entry you have in hand.
153	*
154	* This works because the "." entry is simply the first directory
155	* record when you start reading the file that holds all the directory
156	* records, and this file starts at "extent + ext_attr_length" blocks.
157	* Because the "." entry is always the first entry listed in the
158	* directories file, the normalized "offset" value is always 0.
159	*
160	* You should pass the directory entry in "de". On return, "block"
161	* and "offset" will hold normalized values. Only directories are
162	* affected making it safe to call even for non-directory file
163	* types. */
164	static inline void
165	isofs_normalize_block_and_offset(struct iso_directory_record* de,
166	unsigned long *block,
167	unsigned long *offset)
168	{
169	/* Only directories are normalized. */
170	if (de->flags[0] & 2) {
171	*offset = 0;
172	*block = (unsigned long)isonum_733(de->extent)
173	+ (unsigned long)isonum_711(de->ext_attr_length);
174	}
175	}
176
177	extern struct inode_operations isofs_dir_inode_operations;
178	extern struct file_operations isofs_dir_operations;
179	extern struct address_space_operations isofs_symlink_aops;
180	extern struct export_operations isofs_export_ops;