1 #ifndef FILE_SUFS_H
2 #define FILE_SUFS_H
3 #include <stdint.h>
4 
5 #define SUFS_MAGIC	0x01020304
6 #define SUFS_BOOTSIZE	65536
7 #define SUFS_NDIRECT	6
8 #define SUFS_NINDIR	3
9 #define SUFS_NBLOCKS	(SUFS_NDIRECT + SUFS_NINDIR)
10 #define SUFS_INO_INVAL	0
11 #define SUFS_INO_ROOT	1
12 
13 typedef uint64_t sufs_ino_t;
14 
15 struct sufs_superblock {
16 	uint32_t magic;		// 0	magic number
17 	uint32_t bsize;		// 4	block size
18 	uint64_t nino;		// 8	number of inodes
19 	uint64_t ndata;		// 16	number of data blocks
20 	uint32_t ibmoff;	// 24	inode bitmap offset
21 	uint32_t dbmoff;	// 28	data bitmap offset
22 	uint32_t ioff;		// 32	inode blocks offset
23 	uint32_t doff;		// 36	data blocks offset
24 	uint8_t clean;		// 40	cleanly umounted?
25 
26 	char spare[512 - 2 * 8 -  6 * 4 - 1];
27 };
28 
29 struct sufs_inode {
30 	uint16_t mode;			// 0	type+perms
31 	uint16_t spare;			// 2	spare
32 	uint32_t uid;			// 4	user ID
33 	uint32_t gid;			// 8	group ID
34 	uint32_t nlink;			// 12	number of links
35 	uint64_t size;			// 16	size
36 	uint64_t blocks;		// 24	number of blocks
37 	int64_t atime;			// 32	access time
38 	int64_t mtime;			// 40	modify time
39 	int64_t ctime;			// 48	change time
40 	uint64_t direct[SUFS_NDIRECT];	// 56	direct blocks
41 	uint64_t indir[SUFS_NINDIR];	// 104	indirect blocks 
42 };
43 
44 struct sufs_dirent {
45 	uint64_t ino;			// 0	inode number
46 	uint16_t size;			// 8	size of entry
47 	uint8_t len;			// 10	name length
48 	char name[];			// 11	name
49 } __attribute__((packed));
50 
51 #define STASSERT(x) _Static_assert(x, #x)
52 
53 STASSERT(sizeof(struct sufs_superblock) == 512);
54 STASSERT(sizeof(struct sufs_inode) == 128);
55 
56 #define sufs_ipb(sb) ((sb).bsize / sizeof (struct sufs_inode))
57 #define sufs_iblk(sb, ino) ((sb).ioff + ((ino) / sufs_ipb (sb)))
58 #define sufs_ioff(sb, ino) (((ino) & (sufs_ipb(sb) - 1)) * sizeof (struct sufs_inode))
59 
60 #endif // FILE_SUFS_H