readufs.h revision 1.2 
1/*	from Id: readufs.h,v 1.7 2002/01/26 15:55:51 itohy Exp 	*/
2
3/*
4 * Written by ITOH, Yasufumi (itohy@netbsd.org)
5 * Public domain.
6 */
7
8#include <ufs/ufs/dir.h>
9
10/*
11 * filesystem information
12 */
13struct ufs_info {
14	enum ufs_fstype {
15		UFSTYPE_UNKNOWN
16#ifdef USE_FFS
17		, UFSTYPE_FFS
18#endif
19#ifdef USE_LFS
20		, UFSTYPE_LFS
21#endif
22	} fstype;
23	int (*get_inode) __P((ino_t ino, struct dinode *dibuf));
24
25	/* superblock information */
26	u_int32_t bsize;	/* fs block size */
27	u_int32_t nindir;	/* # indirect per block */
28	u_int32_t fsbtodb;	/* block -> sector shift count */
29	union {
30#ifdef USE_FFS
31		struct {
32			ufs_daddr_t iblkno;	/* inode-block offset */
33			int32_t cgoffset;	/* cylinder group offset */
34			int32_t cgmask;		/* cylinder group mask */
35			int32_t fragshift;	/* block to fragmentation */
36			int32_t inopb;		/* # inodes per block */
37			int32_t ipg;		/* # inodes per group */
38			int32_t fpg;		/* # inodes per group * frag */
39		} u_ffs;
40#endif
41#ifdef USE_LFS
42		struct {
43			u_int32_t version;	/* LFS version # */
44			ufs_daddr_t idaddr;	/* ifile inode disk address */
45			u_int32_t inopb;	/* inodes per block (v1) */
46						/* inodes per frag (v2) */
47			u_int32_t ifpb;		/* inode addrs / ifile block */
48			u_int32_t ioffset;	/* start of inode in ifile */
49						/* (in sector) */
50			u_int32_t ibsize;	/* size of inode block */
51		} u_lfs;
52#endif
53	} fs_u;
54};
55
56extern struct ufs_info	ufs_info;
57#define ufs_get_inode(ino, di)	((*ufs_info.get_inode)((ino), (di)))
58
59void RAW_READ __P((void *buf, ufs_daddr_t blkpos, size_t bytelen));
60
61size_t ufs_read __P((struct dinode *di, void *buf, unsigned off, size_t count));
62ino_t ufs_lookup __P((ino_t dirino, const char *fn));
63ino_t ufs_lookup_path __P((const char *path));
64size_t ufs_load_file __P((void *buf, ino_t dirino, const char *fn));
65int ufs_init __P((void));
66
67#ifdef USE_FFS
68int try_ffs __P((void));
69#endif
70
71#ifdef USE_LFS
72int try_lfs __P((void));
73#endif
74
75#ifdef DEBUG_WITH_STDIO
76#include <fcntl.h>
77#include <err.h>
78#include <stdio.h>
79#include <unistd.h>
80#include <stdlib.h>
81#endif
82