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

/* SPDX-License-Identifier: GPL-2.0 */
/*
 * 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
b2441318	1	/* SPDX-License-Identifier: GPL-2.0 */
a089221c AM	2	/*
	3	* These structs are used by the system-use-sharing protocol, in which the
	4	* Rock Ridge extensions are embedded. It is quite possible that other
	5	* extensions are present on the disk, and this is fine as long as they
	6	* all use SUSP
	7	*/
	8
642217c1	9	struct SU_SP_s {
a089221c AM	10	unsigned char magic[2];
	11	unsigned char skip;
	12	} __attribute__ ((packed));
	13
642217c1	14	struct SU_CE_s {
a089221c AM	15	char extent[8];
	16	char offset[8];
	17	char size[8];
1da177e4 LT	18	};
1da177e4 LT	19
642217c1	20	struct SU_ER_s {
a089221c AM	21	unsigned char len_id;
	22	unsigned char len_des;
	23	unsigned char len_src;
	24	unsigned char ext_ver;
	25	char data[0];
	26	} __attribute__ ((packed));
	27
642217c1	28	struct RR_RR_s {
a089221c AM	29	char flags[1];
	30	} __attribute__ ((packed));
	31
642217c1	32	struct RR_PX_s {
a089221c AM	33	char mode[8];
	34	char n_links[8];
	35	char uid[8];
	36	char gid[8];
1da177e4 LT	37	};
1da177e4 LT	38
642217c1	39	struct RR_PN_s {
a089221c AM	40	char dev_high[8];
a089221c AM	41	char dev_low[8];
1da177e4 LT	42	};
1da177e4 LT	43
a089221c AM	44	struct SL_component {
	45	unsigned char flags;
	46	unsigned char len;
	47	char text[0];
	48	} __attribute__ ((packed));
1da177e4	49
642217c1	50	struct RR_SL_s {
a089221c AM	51	unsigned char flags;
	52	struct SL_component link;
	53	} __attribute__ ((packed));
1da177e4	54
642217c1	55	struct RR_NM_s {
a089221c AM	56	unsigned char flags;
	57	char name[0];
	58	} __attribute__ ((packed));
1da177e4	59
642217c1	60	struct RR_CL_s {
a089221c	61	char location[8];
1da177e4 LT	62	};
1da177e4 LT	63
642217c1	64	struct RR_PL_s {
a089221c	65	char location[8];
1da177e4 LT	66	};
1da177e4 LT	67
a089221c AM	68	struct stamp {
	69	char time[7];
	70	} __attribute__ ((packed));
1da177e4	71
642217c1	72	struct RR_TF_s {
a089221c AM	73	char flags;
	74	struct stamp times[0]; /* Variable number of these beasts */
	75	} __attribute__ ((packed));
1da177e4 LT	76
1da177e4 LT	77	/* Linux-specific extension for transparent decompression */
642217c1	78	struct RR_ZF_s {
a089221c AM	79	char algorithm[2];
	80	char parms[2];
	81	char real_size[8];
1da177e4 LT	82	};
1da177e4 LT	83
a089221c AM	84	/*
	85	* These are the bits and their meanings for flags in the TF structure.
	86	*/
1da177e4 LT	87	#define TF_CREATE 1
	88	#define TF_MODIFY 2
	89	#define TF_ACCESS 4
	90	#define TF_ATTRIBUTES 8
	91	#define TF_BACKUP 16
	92	#define TF_EXPIRATION 32
	93	#define TF_EFFECTIVE 64
	94	#define TF_LONG_FORM 128
	95
a089221c AM	96	struct rock_ridge {
	97	char signature[2];
	98	unsigned char len;
	99	unsigned char version;
	100	union {
642217c1 AM	101	struct SU_SP_s SP;
	102	struct SU_CE_s CE;
	103	struct SU_ER_s ER;
	104	struct RR_RR_s RR;
	105	struct RR_PX_s PX;
	106	struct RR_PN_s PN;
	107	struct RR_SL_s SL;
	108	struct RR_NM_s NM;
	109	struct RR_CL_s CL;
	110	struct RR_PL_s PL;
	111	struct RR_TF_s TF;
	112	struct RR_ZF_s ZF;
a089221c	113	} u;
1da177e4 LT	114	};
1da177e4 LT	115
a089221c AM	116	#define RR_PX 1 /* POSIX attributes */
	117	#define RR_PN 2 /* POSIX devices */
	118	#define RR_SL 4 /* Symbolic link */
	119	#define RR_NM 8 /* Alternate Name */
	120	#define RR_CL 16 /* Child link */
	121	#define RR_PL 32 /* Parent link */
	122	#define RR_RE 64 /* Relocation directory */
	123	#define RR_TF 128 /* Timestamps */