Subversion Repositories planix.SVN

typedef struct Xfs	Xfs;

typedef struct Xfile	Xfile;

typedef struct Iobuf	Iobuf;

typedef struct Ext2 Ext2;

typedef struct SuperBlock SuperBlock;

typedef struct GroupDesc GroupDesc;

typedef struct Inode Inode;

typedef struct DirEntry DirEntry;

#define SECTORSIZE	512

#define OFFSET_SUPER_BLOCK	1024

#define EXT2_SUPER_MAGIC	0xEF53

#define EXT2_MIN_BLOCK_SIZE  1024

#define EXT2_MAX_BLOCK_SIZE  4096

#define EXT2_ROOT_INODE	2

#define EXT2_FIRST_INO		11

#define EXT2_VALID_FS	0x0001

#define EXT2_ERROR_FS	0x0002

/*

 * Structure of the super block

 */

struct SuperBlock {

	uint	s_inodes_count;		/* Inodes count */

	uint	s_blocks_count;		/* Blocks count */

	uint	s_r_blocks_count;	/* Reserved blocks count */

	uint	s_free_blocks_count;	/* Free blocks count */

	uint	s_free_inodes_count;	/* Free inodes count */

	uint	s_first_data_block;	/* First Data Block */

	uint	s_log_block_size;	/* Block size */

	int	s_log_frag_size;	/* Fragment size */

	uint	s_blocks_per_group;	/* # Blocks per group */

	uint	s_frags_per_group;	/* # Fragments per group */

	uint	s_inodes_per_group;	/* # Inodes per group */

	uint	s_mtime;		/* Mount time */

	uint	s_wtime;		/* Write time */

	ushort	s_mnt_count;		/* Mount count */

	short	s_max_mnt_count;	/* Maximal mount count */

	ushort	s_magic;		/* Magic signature */

	ushort	s_state;		/* File system state */

	ushort	s_errors;		/* Behaviour when detecting errors */

	ushort	s_pad;

	uint	s_lastcheck;		/* time of last check */

	uint	s_checkinterval;	/* max. time between checks */

	uint	s_creator_os;		/* OS */

	uint	s_rev_level;		/* Revision level */

	ushort	s_def_resuid;		/* Default uid for reserved blocks */

	ushort	s_def_resgid;		/* Default gid for reserved blocks */

	uint	s_reserved[235];	/* Padding to the end of the block */

};

/*

 * Structure of a blocks group descriptor

 */

struct GroupDesc

{

	uint	bg_block_bitmap;		/* Blocks bitmap block */

	uint	bg_inode_bitmap;		/* Inodes bitmap block */

	uint	bg_inode_table;		/* Inodes table block */

	ushort	bg_free_blocks_count;	/* Free blocks count */

	ushort	bg_free_inodes_count;	/* Free inodes count */

	ushort	bg_used_dirs_count;	/* Directories count */

	ushort	bg_pad;

	uint	bg_reserved[3];

};

/*

 * Constants relative to the data blocks

 */

#define	EXT2_NDIR_BLOCKS		12

#define	EXT2_IND_BLOCK			EXT2_NDIR_BLOCKS

#define	EXT2_DIND_BLOCK			(EXT2_IND_BLOCK + 1)

#define	EXT2_TIND_BLOCK			(EXT2_DIND_BLOCK + 1)

#define	EXT2_N_BLOCKS			(EXT2_TIND_BLOCK + 1)

/*

 * Structure of an inode on the disk

 */

struct Inode {

	ushort i_mode;		/* File mode */

	ushort i_uid;		/* Owner Uid */

	uint  i_size;		/* Size in bytes */

	uint  i_atime;		/* Access time */

	uint i_ctime;		/* Creation time */

	uint  i_mtime;		/* Modification time */

	uint  i_dtime;		/* Deletion Time */

	ushort i_gid;		/* Group Id */

	ushort i_links_count;	/* Links count */

	uint  i_blocks;	/* Blocks count */

	uint  i_flags;		/* File flags */

	uint osd1;				

	uint	i_block[EXT2_N_BLOCKS];/* Pointers to blocks */

	uint	i_version;	/* File version (for NFS) */

	uint	i_file_acl;	/* File ACL */

	uint	i_dir_acl;	/* Directory ACL */

	uint	i_faddr;		/* Fragment address */

	uchar osd2[12];

};

/*

 * Structure of a directory entry

 */

#define EXT2_NAME_LEN 255

#define DIR_REC_LEN(name_len)	(((name_len) + 8 + 3) & ~3)

struct DirEntry {

	uint	inode;			/* Inode number */

	ushort	rec_len;		/* Directory entry length */

	uchar	name_len;		/* Name length */

	uchar	reserved;

	char	name[EXT2_NAME_LEN];	/* File name */

};

#define S_IFMT  00170000

#define S_IFLNK	 0120000

#define S_IFREG  0100000

#define S_IFDIR  0040000

#define S_ISLNK(m)	(((m) & S_IFMT) == S_IFLNK)

#define S_ISREG(m)	(((m) & S_IFMT) == S_IFREG)

#define S_ISDIR(m)	(((m) & S_IFMT) == S_IFDIR)

#define DEFAULT_UID	200

#define DEFAULT_GID	100

struct Iobuf

{

	Xfs *dev;

	long	addr;

	Iobuf *next;

	Iobuf *prev;

	Iobuf *hash;

	int busy;

	int dirty;

	char *iobuf;

};

struct Xfs{

	Xfs *next;

	char *name;		/* of file containing external f.s. */

	Qid	qid;		/* of file containing external f.s. */

	long	ref;		/* attach count */

	Qid	rootqid;	/* of plan9 constructed root directory */

	short	dev;

	short	fmt;

	void *ptr; 

	/* data from super block */

	int block_size;

	int desc_per_block;

	int inodes_per_group;

	int inodes_per_block;

	int addr_per_block;

	int blocks_per_group;

	int ngroups;

	int superaddr, superoff;

	int grpaddr;

};

struct Xfile{

	Xfile *next;		/* in hash bucket */

	long	client;

	long	fid;

	Xfs *	xf;

	void *	ptr;

	uint inbr;		/* inode nbr */

	uint pinbr;	/* parrent inode */

	ulong bufaddr;	/* addr of inode block */

	ulong bufoffset;

	int root;		/* true on attach for ref count */

	int dirindex;	/* next dir entry to read */

};

#define EXT2_SUPER		1

#define EXT2_DESC		2

#define EXT2_BBLOCK	3

#define EXT2_BINODE	4

struct Ext2{

	char type;

	union{

		SuperBlock *sb;

		GroupDesc *gd;

		char *bmp;

	}u;

	Iobuf *buf;

};

#define DESC_ADDR(xf,n)		( (xf)->grpaddr + ((n)/(xf)->desc_per_block) )

#define DESC_OFFSET(xf,d,n)	( ((GroupDesc *)(d)) + ((n)%(xf)->desc_per_block) )

enum{

	Asis, Clean, Clunk

};

enum{

	Enevermind,

	Eformat,

	Eio,

	Enomem,

	Enonexist,

	Eexist,

	Eperm,

	Enofilsys,

	Eauth,

	Enospace,

	Elink,

	Elongname,

	Eintern,

	Ecorrupt,

	Enotclean

};

extern int	chatty;

extern int	errno;

extern char	*deffile;

extern int rdonly;