1 typedef struct Super Super;
2 typedef struct Group Group;
3 typedef struct Inode Inode;
4 typedef struct Dirent Dirent;
5 typedef struct Ext2 Ext2;
6 
7 enum
8 {
9 	BYTESPERSEC	= 512,
10 
11 	SBOFF = 1024,
12 	SBSIZE = 1024,
13 
14 	SUPERMAGIC = 0xEF53,
15 	MINBLOCKSIZE = 1024,
16 	MAXBLOCKSIZE = 4096,
17 	ROOTINODE = 2,
18 	FIRSTINODE = 11,
19 	VALIDFS = 0x0001,
20 	ERRORFS = 0x0002,
21 
22 	NDIRBLOCKS = 12,
23 	INDBLOCK = NDIRBLOCKS,
24 	DINDBLOCK = INDBLOCK+1,
25 	TINDBLOCK = DINDBLOCK+1,
26 	NBLOCKS = TINDBLOCK+1,
27 
28 	NAMELEN = 255,
29 
30 	/* some systems have these defined */
31 	#undef IEXEC
32 	#undef IWRITE
33 	#undef IREAD
34 	#undef ISVTX
35 	#undef ISGID
36 	#undef ISUID
37 	#undef IFMT
38 	#undef IFIFO
39 	#undef IFCHR
40 	#undef IFDIR
41 	#undef IFBLK
42 	#undef IFREG
43 	#undef IFLNK
44 	#undef IFSOCK
45 	#undef IFWHT
46 
47 	#define IEXEC	EXT2_IEXEC
48 	#define IWRITE	EXT2_IWRITE
49 	#define IREAD	EXT2_IREAD
50 	#define ISVTX	EXT2_ISVTX
51 	#define ISGID	EXT2_ISGID
52 	#define ISUID	EXT2_ISUID
53 	#define IFMT	EXT2_IFMT
54 	#define IFIFO	EXT2_IFIFO
55 	#define IFCHR	EXT2_IFCHR
56 	#define IFDIR	EXT2_IFDIR
57 	#define IFBLK	EXT2_IFBLK
58 	#define IFREG	EXT2_IFREG
59 	#define IFLNK	EXT2_IFLNK
60 	#define IFSOCK	EXT2_IFSOCK
61 	#define IFWHT	EXT2_IFWHT
62 
63 	/* permissions in Inode.mode */
64 	IEXEC = 00100,
65 	IWRITE = 0200,
66 	IREAD = 0400,
67 	ISVTX = 01000,
68 	ISGID = 02000,
69 	ISUID = 04000,
70 
71 	/* type in Inode.mode */
72 	IFMT = 0170000,
73 	IFIFO = 0010000,
74 	IFCHR = 0020000,
75 	IFDIR = 0040000,
76 	IFBLK = 0060000,
77 	IFREG = 0100000,
78 	IFLNK = 0120000,
79 	IFSOCK = 0140000,
80 	IFWHT = 0160000
81 };
82 
83 #define DIRLEN(namlen)	(((namlen)+8+3)&~3)
84 
85 
86 /*
87  * Super block
88  */
89 struct Super
90 {
91 	u32int	ninode;		/* Inodes count */
92 	u32int	nblock;		/* Blocks count */
93 	u32int	rblockcount;	/* Reserved blocks count */
94 	u32int	freeblockcount;	/* Free blocks count */
95 	u32int	freeinodecount;	/* Free inodes count */
96 	u32int	firstdatablock;	/* First Data Block */
97 	u32int	logblocksize;	/* Block size */
98 	u32int	logfragsize;	/* Fragment size */
99 	u32int	blockspergroup;	/* # Blocks per group */
100 	u32int	fragpergroup;	/* # Fragments per group */
101 	u32int	inospergroup;	/* # Inodes per group */
102 	u32int	mtime;		/* Mount time */
103 	u32int	wtime;		/* Write time */
104 	u16int	mntcount;		/* Mount count */
105 	u16int	maxmntcount;	/* Maximal mount count */
106 	u16int	magic;		/* Magic signature */
107 	u16int	state;		/* File system state */
108 	u16int	errors;		/* Behaviour when detecting errors */
109 	u16int	pad;
110 	u32int	lastcheck;		/* time of last check */
111 	u32int	checkinterval;	/* max. time between checks */
112 	u32int	creatoros;		/* OS */
113 	u32int	revlevel;		/* Revision level */
114 	u16int	defresuid;		/* Default uid for reserved blocks */
115 	u16int	defresgid;		/* Default gid for reserved blocks */
116 
117 	/* the following are only available with revlevel = 1 */
118 	u32int	firstino;		/* First non-reserved inode */
119 	u16int	inosize;		/* size of inode structure */
120 	u16int	blockgroupnr;	/* block group # of this super block */
121 	u32int	reserved[233];	/* Padding to the end of the block */
122 };
123 
124 /*
125  * Block group
126  */
127 struct Group
128 {
129 	u32int	bitblock;		/* Blocks bitmap block */
130 	u32int	inodebitblock;		/* Inodes bitmap block */
131 	u32int	inodeaddr;		/* Inodes table block */
132 	u16int	freeblockscount;	/* Free blocks count */
133 	u16int	freeinodescount;	/* Free inodes count */
134 	u16int	useddirscount;	/* Directories count */
135 };
136 enum
137 {
138 	GroupSize = 32
139 };
140 
141 /*
142  * Inode
143  */
144 struct Inode
145 {
146 	u16int	mode;		/* File mode */
147 	u16int	uid;		/* Owner Uid */
148 	u32int	size;		/* Size in bytes */
149 	u32int	atime;		/* Access time */
150 	u32int	ctime;		/* Creation time */
151 	u32int	mtime;		/* Modification time */
152 	u32int	dtime;		/* Deletion Time */
153 	u16int	gid;		/* Group Id */
154 	u16int	nlink;	/* Links count */
155 	u32int	nblock;	/* Blocks count */
156 	u32int	flags;		/* File flags */
157 	u32int	block[NBLOCKS];/* Pointers to blocks */
158 	u32int	version;	/* File version (for NFS) */
159 	u32int	fileacl;	/* File ACL */
160 	u32int	diracl;	/* Directory ACL or high size bits */
161 	u32int	faddr;		/* Fragment address */
162 };
163 
164 /*
165  * Directory entry
166  */
167 struct Dirent
168 {
169 	u32int	ino;			/* Inode number */
170 	u16int	reclen;		/* Directory entry length */
171 	u8int	namlen;		/* Name length */
172 	char	*name;	/* File name */
173 };
174 enum
175 {
176 	MinDirentSize = 4+2+1+1
177 };
178 
179 /*
180  * In-core fs info.
181  */
182 struct Ext2
183 {
184 	uint	blocksize;
185 	uint	nblock;
186 	uint	ngroup;
187 	uint	inospergroup;
188 	uint	blockspergroup;
189 	uint	inosperblock;
190 	uint	inosize;
191 	uint	groupaddr;
192 	uint	descperblock;
193 	uint	firstblock;
194 	Disk *disk;
195 	Fsys *fsys;
196 };