readufs.h revision 1.10 
1/*	$NetBSD: readufs.h,v 1.10 2011/02/21 02:31:58 itohy Exp $	*/
2/*	from Id: readufs.h,v 1.9 2003/10/15 14:16:58 itohy Exp 	*/
3
4/*
5 * Written in 1999, 2002, 2003 by ITOH Yasufumi.
6 * Public domain.
7 */
8
9#include <sys/types.h>
10#include <sys/param.h>
11#include <ufs/ufs/dinode.h>
12#include <ufs/ufs/dir.h>
13
14/*
15 * UFS1 / UFS2
16 */
17union ufs_dinode {
18#ifdef USE_UFS1
19	struct ufs1_dinode di1;
20#endif
21#ifdef USE_UFS2
22	struct ufs2_dinode di2;
23#endif
24};
25
26/* For more compact code and independence on 64-bit types and ops */
27typedef uint32_t	ino32_t;
28
29/* short-cut for common fields (di_mode, di_nlink) */
30#ifdef USE_UFS1
31# define di_common	di1
32#elif defined USE_UFS2
33# define di_common	di2
34#endif
35
36/* for fields of same names and different locations */
37#if !(defined(USE_UFS1) && defined(USE_UFS2))
38# ifdef USE_UFS1
39#  define di_thisver	di1
40# endif
41# ifdef USE_UFS2
42#  define di_thisver	di2
43# endif
44#endif
45
46/* this is a size hack */
47#if defined(USE_UFS1) && defined(USE_UFS2)
48# define DI_SIZE(di)	((di)->di1.di_size)
49#else
50# define DI_SIZE(di)	((di)->di_thisver.di_size)
51#endif
52/* and may break following fields on UFS2 */
53#define di_gid		di_gid__is_not_available
54#define di_blksize	di_blksize__is_not_available
55
56/*
57 * filesystem information
58 */
59struct ufs_info {
60	enum ufs_fstype {
61		UFSTYPE_UNKNOWN
62#ifdef USE_FFS
63		, UFSTYPE_FFS
64#endif
65#ifdef USE_LFS
66		, UFSTYPE_LFS
67#endif
68	} fstype;
69#if defined(USE_UFS1) && defined(USE_UFS2)
70	enum ufs_ufstype {
71		UFSTYPE_UFS1, UFSTYPE_UFS2
72	} ufstype;
73#endif
74	int (*get_inode)(ino32_t ino, union ufs_dinode *dibuf);
75
76	/* superblock information */
77	u_int32_t bsize;	/* fs block size */
78	u_int32_t nindir;	/* # indirect per block */
79	u_int32_t fsbtodb;	/* block -> sector shift count */
80	union {
81#ifdef USE_FFS
82		struct {
83			daddr_t iblkno;		/* inode-block offset */
84			int32_t old_cgoffset;	/* cylinder group offset */
85			int32_t old_cgmask;	/* cylinder group mask */
86			int32_t fragshift;	/* block to fragmentation */
87			int32_t inopb;		/* # inodes per block */
88			int32_t ipg;		/* # inodes per group */
89			int32_t fpg;		/* # inodes per group * frag */
90			int32_t magic;		/* FS_UFSx_MAGIC */
91		} u_ffs;
92#endif
93#ifdef USE_LFS
94		struct {
95			u_int32_t version;	/* LFS version # */
96			daddr_t idaddr;		/* ifile inode disk address */
97			u_int32_t inopb;	/* inodes per block (v1) */
98						/* inodes per frag (v2) */
99			u_int32_t ifpb;		/* inode addrs / ifile block */
100			u_int32_t ioffset;	/* start of inode in ifile */
101						/* (in sector) */
102			u_int32_t ibsize;	/* size of inode block */
103		} u_lfs;
104#endif
105	} fs_u;
106};
107
108extern struct ufs_info	ufs_info;
109#define ufs_get_inode(ino, di)	((*ufs_info.get_inode)((ino), (di)))
110
111void RAW_READ(void *buf, daddr_t blkpos, size_t bytelen);
112
113size_t ufs_read(union ufs_dinode *di, void *buf, unsigned off,
114    size_t count);
115ino32_t ufs_lookup(ino32_t dirino, const char *fn);
116ino32_t ufs_lookup_path(const char *path);
117size_t ufs_load_file(void *buf, ino32_t dirino, const char *fn);
118int ufs_init(void);
119
120#ifdef USE_FFS
121int try_ffs(void);
122#endif
123
124#ifdef USE_LFS
125int try_lfs(void);
126#endif
127
128#ifdef DEBUG_WITH_STDIO
129#include <fcntl.h>
130#include <err.h>
131#include <stdio.h>
132#include <unistd.h>
133#include <stdlib.h>
134#endif
135
136#ifdef __GNUC__
137# ifndef alloca
138#  define alloca(n)	__builtin_alloca(n)
139# endif
140# ifndef strcmp
141#  define strcmp(p, q)	__builtin_strcmp(p, q)
142# endif
143#endif
144