/*  * This file is part of the UCB release of Plan 9. It is subject to the license * terms in the LICENSE file found in the top-level directory of this * distribution and at http://akaros.cs.berkeley.edu/files/Plan9License. No * part of the UCB release of Plan 9, including this file, may be copied, * modified, propagated, or distributed except according to the terms contained * in the LICENSE file. */ 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;