busybox/util-linux/minix.h

/*
 * This is the original minix inode layout on disk.
 * Note the 8-bit gid and atime and ctime.
 */
struct minix1_inode {
	uint16_t i_mode;
	uint16_t i_uid;
	uint32_t i_size;
	uint32_t i_time;
	uint8_t  i_gid;
	uint8_t  i_nlinks;
	uint16_t i_zone[9];
};

/*
 * The new minix inode has all the time entries, as well as
 * long block numbers and a third indirect block (7+1+1+1
 * instead of 7+1+1). Also, some previously 8-bit values are
 * now 16-bit. The inode is now 64 bytes instead of 32.
 */
struct minix2_inode {
	uint16_t i_mode;
	uint16_t i_nlinks;
	uint16_t i_uid;
	uint16_t i_gid;
	uint32_t i_size;
	uint32_t i_atime;
	uint32_t i_mtime;
	uint32_t i_ctime;
	uint32_t i_zone[10];
};

/*
 * minix superblock data on disk
 */
struct minix_superblock {
	uint16_t s_ninodes;
	uint16_t s_nzones;
	uint16_t s_imap_blocks;
	uint16_t s_zmap_blocks;
	uint16_t s_firstdatazone;
	uint16_t s_log_zone_size;
	uint32_t s_max_size;
	uint16_t s_magic;
	uint16_t s_state;
	uint32_t s_zones;
};

struct minix_dir_entry {
	uint16_t inode;
	char name[0];
};

/* Believe it or not, but mount.h has this one #defined */
#undef BLOCK_SIZE

enum {
	BLOCK_SIZE              = 1024,
	BITS_PER_BLOCK          = BLOCK_SIZE << 3,

	MINIX_ROOT_INO          = 1,
	MINIX_BAD_INO           = 2,

	MINIX1_SUPER_MAGIC      = 0x137F,       /* original minix fs */
	MINIX1_SUPER_MAGIC2     = 0x138F,       /* minix fs, 30 char names */
	MINIX2_SUPER_MAGIC      = 0x2468,       /* minix V2 fs */
	MINIX2_SUPER_MAGIC2     = 0x2478,       /* minix V2 fs, 30 char names */
	MINIX_VALID_FS          = 0x0001,       /* clean fs */
	MINIX_ERROR_FS          = 0x0002,       /* fs has errors */

	INODE_SIZE1             = sizeof(struct minix1_inode),
	INODE_SIZE2             = sizeof(struct minix2_inode),
	MINIX1_INODES_PER_BLOCK = BLOCK_SIZE / sizeof(struct minix1_inode),
	MINIX2_INODES_PER_BLOCK = BLOCK_SIZE / sizeof(struct minix2_inode),
};

/*
Basic test script for regressions in mkfs/fsck.
Copies current dir into image (typically bbox build tree).

#!/bin/sh
tmpdir=/tmp/minixtest-$$
tmpimg=/tmp/minix-img-$$

mkdir $tmpdir
dd if=/dev/zero of=$tmpimg bs=1M count=20 || exit
./busybox mkfs.minix $tmpimg || exit
mount -o loop $tmpimg $tmpdir || exit
cp -a "$PWD" $tmpdir
umount $tmpdir || exit
./busybox fsck.minix -vfm $tmpimg || exit
echo "Continue?"
read junk
./busybox fsck.minix -vfml $tmpimg || exit
rmdir $tmpdir
rm $tmpimg

*/
1	niro	532	/*
2			* This is the original minix inode layout on disk.
3			* Note the 8-bit gid and atime and ctime.
4			*/
5			struct minix1_inode {
6			uint16_t i_mode;
7			uint16_t i_uid;
8			uint32_t i_size;
9			uint32_t i_time;
10			uint8_t i_gid;
11			uint8_t i_nlinks;
12			uint16_t i_zone[9];
13			};
14
15			/*
16			* The new minix inode has all the time entries, as well as
17			* long block numbers and a third indirect block (7+1+1+1
18			* instead of 7+1+1). Also, some previously 8-bit values are
19			* now 16-bit. The inode is now 64 bytes instead of 32.
20			*/
21			struct minix2_inode {
22			uint16_t i_mode;
23			uint16_t i_nlinks;
24			uint16_t i_uid;
25			uint16_t i_gid;
26			uint32_t i_size;
27			uint32_t i_atime;
28			uint32_t i_mtime;
29			uint32_t i_ctime;
30			uint32_t i_zone[10];
31			};
32
33			/*
34	niro	816	* minix superblock data on disk
35	niro	532	*/
36	niro	816	struct minix_superblock {
37	niro	532	uint16_t s_ninodes;
38			uint16_t s_nzones;
39			uint16_t s_imap_blocks;
40			uint16_t s_zmap_blocks;
41			uint16_t s_firstdatazone;
42			uint16_t s_log_zone_size;
43			uint32_t s_max_size;
44			uint16_t s_magic;
45			uint16_t s_state;
46			uint32_t s_zones;
47			};
48
49			struct minix_dir_entry {
50			uint16_t inode;
51			char name[0];
52			};
53
54			/* Believe it or not, but mount.h has this one #defined */
55			#undef BLOCK_SIZE
56
57			enum {
58			BLOCK_SIZE = 1024,
59			BITS_PER_BLOCK = BLOCK_SIZE << 3,
60
61			MINIX_ROOT_INO = 1,
62			MINIX_BAD_INO = 2,
63
64			MINIX1_SUPER_MAGIC = 0x137F, /* original minix fs */
65			MINIX1_SUPER_MAGIC2 = 0x138F, /* minix fs, 30 char names */
66			MINIX2_SUPER_MAGIC = 0x2468, /* minix V2 fs */
67			MINIX2_SUPER_MAGIC2 = 0x2478, /* minix V2 fs, 30 char names */
68			MINIX_VALID_FS = 0x0001, /* clean fs */
69			MINIX_ERROR_FS = 0x0002, /* fs has errors */
70
71			INODE_SIZE1 = sizeof(struct minix1_inode),
72			INODE_SIZE2 = sizeof(struct minix2_inode),
73			MINIX1_INODES_PER_BLOCK = BLOCK_SIZE / sizeof(struct minix1_inode),
74			MINIX2_INODES_PER_BLOCK = BLOCK_SIZE / sizeof(struct minix2_inode),
75			};
76
77	niro	816	/*
78			Basic test script for regressions in mkfs/fsck.
79			Copies current dir into image (typically bbox build tree).
80
81			#!/bin/sh
82			tmpdir=/tmp/minixtest-$$
83			tmpimg=/tmp/minix-img-$$
84
85			mkdir $tmpdir
86			dd if=/dev/zero of=$tmpimg bs=1M count=20 \|\| exit
87			./busybox mkfs.minix $tmpimg \|\| exit
88			mount -o loop $tmpimg $tmpdir \|\| exit
89			cp -a "$PWD" $tmpdir
90			umount $tmpdir \|\| exit
91			./busybox fsck.minix -vfm $tmpimg \|\| exit
92			echo "Continue?"
93			read junk
94			./busybox fsck.minix -vfml $tmpimg \|\| exit
95			rmdir $tmpdir
96			rm $tmpimg
97
98			*/