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libufs.h

/*
 * Copyright (c) 2002 Juli Mallett.  All rights reserved.
 *
 * This software was written by Juli Mallett <jmallett@FreeBSD.org> for the
 * FreeBSD project.  Redistribution and use in source and binary forms, with
 * or without modification, are permitted provided that the following
 * conditions are met:
 *
 * 1. Redistribution of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
 * 2. Redistribution in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 *
 * $FreeBSD: src/lib/libufs/libufs.h,v 1.12.8.1 2009/04/15 03:14:26 kensmith Exp $
 */
#define MAXBSIZE 65536 /* must be power of 2 from param.h of ufs*/
#ifndef     __LIBUFS_H__
#define     __LIBUFS_H__

/*
 * libufs macros (internal, non-exported).
 */
#ifdef      _LIBUFS
#ifdef      _LIBUFS_DEBUGGING
/*
 * Trace steps through libufs, to be used at entry and erroneous return.
 */
#define     ERROR(uufsd, str)                         \
do {                                            \
      fprintf(stderr, "libufs in %s", __func__);            \
      if (str != NULL)                          \
            fprintf(stderr, ": %s", str);             \
      if (errno)                                \
            fprintf(stderr, ": %s", strerror(errno)); \
      fprintf(stderr, "\n");                          \
      if ((uufsd) != NULL)                            \
            (uufsd)->d_error = str;                   \
} while (0)
#else /* _LIBUFS_DEBUGGING */
#define     ERROR(uufsd, str)                         \
do {                                            \
      if ((uufsd) != NULL)                            \
            (uufsd)->d_error = str;                   \
} while (0)
#endif      /* _LIBUFS_DEBUGGING */
#endif      /* _LIBUFS */

/*
 * libufs structures.
 */

/*
 * userland ufs disk.
 */
00068 struct uufsd {
      const char *d_name;     /* disk name */
      int d_ufs;        /* decimal UFS version */
      int d_fd;         /* raw device file descriptor */
      long d_bsize;           /* device bsize */
      ufs2_daddr_t d_sblock;  /* superblock location */
      caddr_t d_inoblock;     /* inode block */
      ino_t d_inomin;         /* low inode */
      ino_t d_inomax;         /* high inode */
      union {
            struct fs d_fs;   /* filesystem information */
            char d_sb[MAXBSIZE];
                        /* superblock as buffer */
      } d_sbunion;
      union {
            struct cg d_cg;   /* cylinder group */
            char d_buf[MAXBSIZE];
                        /* cylinder group storage */
      } d_cgunion;
      int d_ccg;        /* current cylinder group */
      int d_lcg;        /* last cylinder group (in d_cg) */
      const char *d_error;    /* human readable disk error */
      int d_mine;       /* internal flags */
#define     d_fs  d_sbunion.d_fs
#define     d_sb  d_sbunion.d_sb
#define     d_cg  d_cgunion.d_cg
};

__BEGIN_DECLS

/*
 * libufs prototypes.
 */

/*
 * block.c
 */
ssize_t bread(struct uufsd *, ufs2_daddr_t, void *, size_t);
ssize_t bwrite(struct uufsd *, ufs2_daddr_t, const void *, size_t);

/*
 * cgroup.c
 */
int cgread(struct uufsd *);
int cgread1(struct uufsd *, int);
int cgwrite1(struct uufsd *, int);

/*
 * inode.c
 */
int getino(struct uufsd *, void **, ino_t, int *);

/*
 * sblock.c
 */
int sbread(struct uufsd *);
int sbwrite(struct uufsd *, int);

/*
 * type.c
 */
int ufs_disk_close(struct uufsd *);
int ufs_disk_fillout(struct uufsd *, const char *);
int ufs_disk_fillout_blank(struct uufsd *, const char *);
int ufs_disk_write(struct uufsd *);

__END_DECLS

#endif      /* __LIBUFS_H__ */

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