[linux.git] / fs / isofs / rock.h

/*
 * These structs are used by the system-use-sharing protocol, in which the
 * Rock Ridge extensions are embedded.  It is quite possible that other
 * extensions are present on the disk, and this is fine as long as they
 * all use SUSP
 */

struct SU_SP_s {
	unsigned char magic[2];
	unsigned char skip;
} __attribute__ ((packed));

struct SU_CE_s {
	char extent[8];
	char offset[8];
	char size[8];
};

struct SU_ER_s {
	unsigned char len_id;
	unsigned char len_des;
	unsigned char len_src;
	unsigned char ext_ver;
	char data[0];
} __attribute__ ((packed));

struct RR_RR_s {
	char flags[1];
} __attribute__ ((packed));

struct RR_PX_s {
	char mode[8];
	char n_links[8];
	char uid[8];
	char gid[8];
};

struct RR_PN_s {
	char dev_high[8];
	char dev_low[8];
};

struct SL_component {
	unsigned char flags;
	unsigned char len;
	char text[0];
} __attribute__ ((packed));

struct RR_SL_s {
	unsigned char flags;
	struct SL_component link;
} __attribute__ ((packed));

struct RR_NM_s {
	unsigned char flags;
	char name[0];
} __attribute__ ((packed));

struct RR_CL_s {
	char location[8];
};

struct RR_PL_s {
	char location[8];
};

struct stamp {
	char time[7];
} __attribute__ ((packed));

struct RR_TF_s {
	char flags;
	struct stamp times[0];	/* Variable number of these beasts */
} __attribute__ ((packed));

/* Linux-specific extension for transparent decompression */
struct RR_ZF_s {
	char algorithm[2];
	char parms[2];
	char real_size[8];
};

/*
 * These are the bits and their meanings for flags in the TF structure.
 */
#define TF_CREATE 1
#define TF_MODIFY 2
#define TF_ACCESS 4
#define TF_ATTRIBUTES 8
#define TF_BACKUP 16
#define TF_EXPIRATION 32
#define TF_EFFECTIVE 64
#define TF_LONG_FORM 128

struct rock_ridge {
	char signature[2];
	unsigned char len;
	unsigned char version;
	union {
		struct SU_SP_s SP;
		struct SU_CE_s CE;
		struct SU_ER_s ER;
		struct RR_RR_s RR;
		struct RR_PX_s PX;
		struct RR_PN_s PN;
		struct RR_SL_s SL;
		struct RR_NM_s NM;
		struct RR_CL_s CL;
		struct RR_PL_s PL;
		struct RR_TF_s TF;
		struct RR_ZF_s ZF;
	} u;
};

#define RR_PX 1			/* POSIX attributes */
#define RR_PN 2			/* POSIX devices */
#define RR_SL 4			/* Symbolic link */
#define RR_NM 8			/* Alternate Name */
#define RR_CL 16		/* Child link */
#define RR_PL 32		/* Parent link */
#define RR_RE 64		/* Relocation directory */
#define RR_TF 128		/* Timestamps */
Commit	Line	Data
a089221c AM	1	/*
	2	* These structs are used by the system-use-sharing protocol, in which the
	3	* Rock Ridge extensions are embedded. It is quite possible that other
	4	* extensions are present on the disk, and this is fine as long as they
	5	* all use SUSP
	6	*/
	7
642217c1	8	struct SU_SP_s {
a089221c AM	9	unsigned char magic[2];
	10	unsigned char skip;
	11	} __attribute__ ((packed));
	12
642217c1	13	struct SU_CE_s {
a089221c AM	14	char extent[8];
	15	char offset[8];
	16	char size[8];
1da177e4 LT	17	};
1da177e4 LT	18
642217c1	19	struct SU_ER_s {
a089221c AM	20	unsigned char len_id;
	21	unsigned char len_des;
	22	unsigned char len_src;
	23	unsigned char ext_ver;
	24	char data[0];
	25	} __attribute__ ((packed));
	26
642217c1	27	struct RR_RR_s {
a089221c AM	28	char flags[1];
	29	} __attribute__ ((packed));
	30
642217c1	31	struct RR_PX_s {
a089221c AM	32	char mode[8];
	33	char n_links[8];
	34	char uid[8];
	35	char gid[8];
1da177e4 LT	36	};
1da177e4 LT	37
642217c1	38	struct RR_PN_s {
a089221c AM	39	char dev_high[8];
a089221c AM	40	char dev_low[8];
1da177e4 LT	41	};
1da177e4 LT	42
a089221c AM	43	struct SL_component {
	44	unsigned char flags;
	45	unsigned char len;
	46	char text[0];
	47	} __attribute__ ((packed));
1da177e4	48
642217c1	49	struct RR_SL_s {
a089221c AM	50	unsigned char flags;
	51	struct SL_component link;
	52	} __attribute__ ((packed));
1da177e4	53
642217c1	54	struct RR_NM_s {
a089221c AM	55	unsigned char flags;
	56	char name[0];
	57	} __attribute__ ((packed));
1da177e4	58
642217c1	59	struct RR_CL_s {
a089221c	60	char location[8];
1da177e4 LT	61	};
1da177e4 LT	62
642217c1	63	struct RR_PL_s {
a089221c	64	char location[8];
1da177e4 LT	65	};
1da177e4 LT	66
a089221c AM	67	struct stamp {
	68	char time[7];
	69	} __attribute__ ((packed));
1da177e4	70
642217c1	71	struct RR_TF_s {
a089221c AM	72	char flags;
	73	struct stamp times[0]; /* Variable number of these beasts */
	74	} __attribute__ ((packed));
1da177e4 LT	75
1da177e4 LT	76	/* Linux-specific extension for transparent decompression */
642217c1	77	struct RR_ZF_s {
a089221c AM	78	char algorithm[2];
	79	char parms[2];
	80	char real_size[8];
1da177e4 LT	81	};
1da177e4 LT	82
a089221c AM	83	/*
	84	* These are the bits and their meanings for flags in the TF structure.
	85	*/
1da177e4 LT	86	#define TF_CREATE 1
	87	#define TF_MODIFY 2
	88	#define TF_ACCESS 4
	89	#define TF_ATTRIBUTES 8
	90	#define TF_BACKUP 16
	91	#define TF_EXPIRATION 32
	92	#define TF_EFFECTIVE 64
	93	#define TF_LONG_FORM 128
	94
a089221c AM	95	struct rock_ridge {
	96	char signature[2];
	97	unsigned char len;
	98	unsigned char version;
	99	union {
642217c1 AM	100	struct SU_SP_s SP;
	101	struct SU_CE_s CE;
	102	struct SU_ER_s ER;
	103	struct RR_RR_s RR;
	104	struct RR_PX_s PX;
	105	struct RR_PN_s PN;
	106	struct RR_SL_s SL;
	107	struct RR_NM_s NM;
	108	struct RR_CL_s CL;
	109	struct RR_PL_s PL;
	110	struct RR_TF_s TF;
	111	struct RR_ZF_s ZF;
a089221c	112	} u;
1da177e4 LT	113	};
1da177e4 LT	114
a089221c AM	115	#define RR_PX 1 /* POSIX attributes */
	116	#define RR_PN 2 /* POSIX devices */
	117	#define RR_SL 4 /* Symbolic link */
	118	#define RR_NM 8 /* Alternate Name */
	119	#define RR_CL 16 /* Child link */
	120	#define RR_PL 32 /* Parent link */
	121	#define RR_RE 64 /* Relocation directory */
	122	#define RR_TF 128 /* Timestamps */