/* $NetBSD: readufs.h,v 1.13 2015/08/21 15:33:04 christos Exp $ */

/* $NetBSD: readufs.h,v 1.13 2015/08/21 15:33:04 christos Exp $ */
/* from Id: readufs.h,v 1.9 2003/10/15 14:16:58 itohy Exp */

/*
* Written in 1999, 2002, 2003 by ITOH Yasufumi.
* Public domain.
*/

#include <sys/types.h>
#include <sys/param.h>
#ifdef USE_LFS
#include <ufs/lfs/lfs.h>
#endif
#include <ufs/ufs/dinode.h>
#include <ufs/lfs/lfs.h>
#include <ufs/ufs/dir.h>

/*
* UFS1 / UFS2
*/
union ufs_dinode {
#ifdef USE_UFS1
struct ufs1_dinode di1;
#endif
#ifdef USE_UFS2
struct ufs2_dinode di2;
#endif
#ifdef USE_LFS
struct lfs32_dinode dil32;
#endif
};

/* For more compact code and independence on 64-bit types and ops */
typedef uint32_t ino32_t;

/* short-cut for common fields (di_mode, di_nlink) */
#ifdef USE_UFS1
# define di_common di1
#elif defined USE_UFS2
# define di_common di2
#endif

/* for fields of same names and different locations */
#if !(defined(USE_UFS1) && defined(USE_UFS2))
# ifdef USE_UFS1
# define di_thisver di1
# endif
# ifdef USE_UFS2
# define di_thisver di2
# endif
#endif

/* this is a size hack */
#if defined(USE_UFS1) && defined(USE_UFS2)
# define DI_SIZE(di) ((di)->di1.di_size)
#else
# define DI_SIZE(di) ((di)->di_thisver.di_size)
#endif
/* and may break following fields on UFS2 */
#define di_gid di_gid__is_not_available
#define di_blksize di_blksize__is_not_available

/*
* filesystem information
*/
struct ufs_info {
enum ufs_fstype {
UFSTYPE_UNKNOWN
#ifdef USE_FFS
, UFSTYPE_FFS
#endif
#ifdef USE_LFS
, UFSTYPE_LFS
#endif
} fstype;
#if defined(USE_UFS1) && defined(USE_UFS2)
enum ufs_ufstype {
UFSTYPE_UFS1, UFSTYPE_UFS2
} ufstype;
#endif
int (*get_inode)(ino32_t ino, union ufs_dinode *dibuf);

/* superblock information */
u_int32_t bsize; /* fs block size */
u_int32_t nindir; /* # indirect per block */
u_int32_t fsbtodb; /* block -> sector shift count */
union {
#ifdef USE_FFS
struct {
daddr_t iblkno; /* inode-block offset */
int32_t old_cgoffset; /* cylinder group offset */
int32_t old_cgmask; /* cylinder group mask */
int32_t fragshift; /* block to fragmentation */
int32_t inopb; /* # inodes per block */
int32_t ipg; /* # inodes per group */
int32_t fpg; /* # inodes per group * frag */
int32_t magic; /* FS_UFSx_MAGIC */
} u_ffs;
#endif
#ifdef USE_LFS
struct {
u_int32_t version; /* LFS version # */
daddr_t idaddr; /* ifile inode disk address */
u_int32_t inopb; /* inodes per block (v1) */
/* inodes per frag (v2) */
u_int32_t ifpb; /* inode addrs / ifile block */
u_int32_t ioffset; /* start of inode in ifile */
/* (in sector) */
u_int32_t ibsize; /* size of inode block */
} u_lfs;
#endif
} fs_u;
};

extern struct ufs_info ufs_info;
#define ufs_get_inode(ino, di) ((*ufs_info.get_inode)((ino), (di)))

void RAW_READ(void *buf, daddr_t blkpos, size_t bytelen);

size_t ufs_read(union ufs_dinode *di, void *buf, unsigned off,
size_t count);
ino32_t ufs_lookup(ino32_t dirino, const char *fn);
ino32_t ufs_lookup_path(const char *path);
size_t ufs_load_file(void *buf, ino32_t dirino, const char *fn);
int ufs_init(void);

#ifdef USE_FFS
int try_ffs(void);
#endif

#ifdef USE_LFS
int try_lfs(void);
#endif

#ifdef DEBUG_WITH_STDIO
#include <fcntl.h>
#include <err.h>
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#endif

#ifdef __GNUC__
# ifndef alloca
# define alloca(n) __builtin_alloca(n)
# endif
# ifndef strcmp
# define strcmp(p, q) __builtin_strcmp(p, q)
# endif
#endif