[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_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;
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 AV	53
	54	mode_t s_mode;
	55	gid_t s_gid;
	56	uid_t s_uid;
	57	struct nls_table s_nls_iocharset; / Native language support table */
	58	};
	59
	60	static inline struct isofs_sb_info ISOFS_SB(struct super_block sb)
	61	{
	62	return sb->s_fs_info;
	63	}
	64
	65	static inline struct iso_inode_info ISOFS_I(struct inode inode)
	66	{
	67	return container_of(inode, struct iso_inode_info, vfs_inode);
	68	}
	69
	70	static inline int isonum_711(char *p)
	71	{
	72	return (u8 )p;
	73	}
	74	static inline int isonum_712(char *p)
	75	{
	76	return (s8 )p;
	77	}
	78	static inline unsigned int isonum_721(char *p)
	79	{
	80	return le16_to_cpu(get_unaligned((__le16 *)p));
	81	}
	82	static inline unsigned int isonum_722(char *p)
	83	{
	84	return be16_to_cpu(get_unaligned((__le16 *)p));
	85	}
	86	static inline unsigned int isonum_723(char *p)
	87	{
	88	/* Ignore bigendian datum due to broken mastering programs */
	89	return le16_to_cpu(get_unaligned((__le16 *)p));
	90	}
	91	static inline unsigned int isonum_731(char *p)
	92	{
	93	return le32_to_cpu(get_unaligned((__le32 *)p));
	94	}
	95	static inline unsigned int isonum_732(char *p)
	96	{
	97	return be32_to_cpu(get_unaligned((__le32 *)p));
	98	}
	99	static inline unsigned int isonum_733(char *p)
	100	{
	101	/* Ignore bigendian datum due to broken mastering programs */
	102	return le32_to_cpu(get_unaligned((__le32 *)p));
	103	}
	104	extern int iso_date(char *, int);
	105
	106	struct inode; /* To make gcc happy */
	107
	108	extern int parse_rock_ridge_inode(struct iso_directory_record , struct inode );
	109	extern int get_rock_ridge_filename(struct iso_directory_record , char , struct inode *);
	110	extern int isofs_name_translate(struct iso_directory_record , char , struct inode *);
	111
	112	int get_joliet_filename(struct iso_directory_record , unsigned char , struct inode *);
	113	int get_acorn_filename(struct iso_directory_record , char , struct inode *);
	114
	115	extern struct dentry isofs_lookup(struct inode , struct dentry , struct nameidata );
	116	extern struct buffer_head isofs_bread(struct inode , sector_t);
117	extern int isofs_get_blocks(struct inode , sector_t, struct buffer_head *, unsigned long);
118
119	extern struct inode isofs_iget(struct super_block sb,
120	unsigned long block,
121	unsigned long offset);
122
123	/* Because the inode number is no longer relevant to finding the
124	* underlying meta-data for an inode, we are free to choose a more
125	* convenient 32-bit number as the inode number. The inode numbering
126	* scheme was recommended by Sergey Vlasov and Eric Lammerts. */
127	static inline unsigned long isofs_get_ino(unsigned long block,
128	unsigned long offset,
129	unsigned long bufbits)
130	{
131	return (block << (bufbits - 5)) \| (offset >> 5);
132	}
133
134	/* Every directory can have many redundant directory entries scattered
135	* throughout the directory tree. First there is the directory entry
136	* with the name of the directory stored in the parent directory.
137	* Then, there is the "." directory entry stored in the directory
138	* itself. Finally, there are possibly many ".." directory entries
139	* stored in all the subdirectories.
140	*
141	* In order for the NFS get_parent() method to work and for the
142	* general consistency of the dcache, we need to make sure the
143	* "i_iget5_block" and "i_iget5_offset" all point to exactly one of
144	* the many redundant entries for each directory. We normalize the
145	* block and offset by always making them point to the "." directory.
146	*
147	* Notice that we do not use the entry for the directory with the name
148	* that is located in the parent directory. Even though choosing this
149	* first directory is more natural, it is much easier to find the "."
150	* entry in the NFS get_parent() method because it is implicitly
151	* encoded in the "extent + ext_attr_length" fields of _all_ the
152	* redundant entries for the directory. Thus, it can always be
153	* reached regardless of which directory entry you have in hand.
154	*
155	* This works because the "." entry is simply the first directory
156	* record when you start reading the file that holds all the directory
157	* records, and this file starts at "extent + ext_attr_length" blocks.
158	* Because the "." entry is always the first entry listed in the
159	* directories file, the normalized "offset" value is always 0.
160	*
161	* You should pass the directory entry in "de". On return, "block"
162	* and "offset" will hold normalized values. Only directories are
163	* affected making it safe to call even for non-directory file
164	* types. */
165	static inline void
166	isofs_normalize_block_and_offset(struct iso_directory_record* de,
167	unsigned long *block,
168	unsigned long *offset)
169	{
170	/* Only directories are normalized. */
171	if (de->flags[0] & 2) {
172	*offset = 0;
173	*block = (unsigned long)isonum_733(de->extent)
174	+ (unsigned long)isonum_711(de->ext_attr_length);
175	}
176	}
177
92e1d5be	178	extern const struct inode_operations isofs_dir_inode_operations;
4b6f5d20	179	extern const struct file_operations isofs_dir_operations;
f5e54d6e	180	extern const struct address_space_operations isofs_symlink_aops;
39655164	181	extern const struct export_operations isofs_export_ops;