rock.h

  1/* SPDX-License-Identifier: GPL-2.0 */
  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
  9struct SU_SP_s {
 10	__u8 magic[2];
 11	__u8 skip;
 12} __attribute__ ((packed));
 13
 14struct SU_CE_s {
 15	__u8 extent[8];
 16	__u8 offset[8];
 17	__u8 size[8];
 18};
 19
 20struct SU_ER_s {
 21	__u8 len_id;
 22	__u8 len_des;
 23	__u8 len_src;
 24	__u8 ext_ver;
 25	__u8 data[];
 26} __attribute__ ((packed));
 27
 28struct RR_RR_s {
 29	__u8 flags[1];
 30} __attribute__ ((packed));
 31
 32struct RR_PX_s {
 33	__u8 mode[8];
 34	__u8 n_links[8];
 35	__u8 uid[8];
 36	__u8 gid[8];
 37};
 38
 39struct RR_PN_s {
 40	__u8 dev_high[8];
 41	__u8 dev_low[8];
 42};
 43
 44struct SL_component {
 45	__u8 flags;
 46	__u8 len;
 47	__u8 text[] __counted_by(len);
 48} __attribute__ ((packed));
 49
 50struct RR_SL_s {
 51	__u8 flags;
 52	struct SL_component link;
 53} __attribute__ ((packed));
 54
 55struct RR_NM_s {
 56	__u8 flags;
 57	char name[];
 58} __attribute__ ((packed));
 59
 60struct RR_CL_s {
 61	__u8 location[8];
 62};
 63
 64struct RR_PL_s {
 65	__u8 location[8];
 66};
 67
 68struct RR_TF_s {
 69	__u8 flags;
 70	__u8 data[];
 71} __attribute__ ((packed));
 72
 73/* Linux-specific extension for transparent decompression */
 74struct RR_ZF_s {
 75	__u8 algorithm[2];
 76	__u8 parms[2];
 77	__u8 real_size[8];
 78};
 79
 80/*
 81 * These are the bits and their meanings for flags in the TF structure.
 82 */
 83#define TF_CREATE 1
 84#define TF_MODIFY 2
 85#define TF_ACCESS 4
 86#define TF_ATTRIBUTES 8
 87#define TF_BACKUP 16
 88#define TF_EXPIRATION 32
 89#define TF_EFFECTIVE 64
 90#define TF_LONG_FORM 128
 91
 92struct rock_ridge {
 93	__u8 signature[2];
 94	__u8 len;
 95	__u8 version;
 96	union {
 97		struct SU_SP_s SP;
 98		struct SU_CE_s CE;
 99		struct SU_ER_s ER;
100		struct RR_RR_s RR;
101		struct RR_PX_s PX;
102		struct RR_PN_s PN;
103		struct RR_SL_s SL;
104		struct RR_NM_s NM;
105		struct RR_CL_s CL;
106		struct RR_PL_s PL;
107		struct RR_TF_s TF;
108		struct RR_ZF_s ZF;
109	} u;
110};
111
112#define RR_PX 1			/* POSIX attributes */
113#define RR_PN 2			/* POSIX devices */
114#define RR_SL 4			/* Symbolic link */
115#define RR_NM 8			/* Alternate Name */
116#define RR_CL 16		/* Child link */
117#define RR_PL 32		/* Parent link */
118#define RR_RE 64		/* Relocation directory */
119#define RR_TF 128		/* Timestamps */