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fs_ufs.h

/***************************************************************************
                          fs_ufs.h  -  description
                             -------------------
    begin                : Thu Jul 13 2000
    copyright            : (C) 2000 by François Dupoux
    email                : fdupoux@partimage.org
 ***************************************************************************/

/***************************************************************************
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 2 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 ***************************************************************************/

#ifndef FS_UFS_H
#define FS_UFS_H

#include "partimage.h"
#include "fs_base.h"

#include <sys/types.h>

// ================================================
// ================================================
// ================================================

/*
 * Cylinder group macros to locate things in cylinder groups.
 * They calc file system addresses of cylinder group data structures.
 */
/*#define   ufs_cgbase(sb,c)        (sb.fs_fpg * (c))
#define ufs_cgstart(sb,c)       (ufs_cgbase(sb,c)  + sb.fs_cgoffset * ((c) & ~sb.fs_cgmask))
#define     ufs_cgsblock(sb,c)      (ufs_cgstart(sb,c) + sb.fs_sblkno)  // super blk 
#define     ufs_cgcmin(sb,c)  (ufs_cgstart(sb,c) + sb.fs_cblkno)  // cg block 
#define     ufs_cgimin(sb,c)  (ufs_cgstart(sb,c) + sb.fs_iblkno)  // inode blk 
#define     ufs_cgdmin(sb,c)  (ufs_cgstart(sb,c) + sb.fs_dblkno)  // 1st data 

#define     ufs_cgcmin(sb,c)  (ufs_cgstart(sb,c) + sb.fs_cblkno)  // cg block 
#define     ufs_cgcmin(sb,c)  ((ufs_cgbase(sb,c)  + sb.fs_cgoffset * ((c) & ~sb.fs_cgmask))  + sb.fs_cblkno)      // cg block */
#define     ufs_cgcmin_sb(sb,c)     (((sb.fs_fpg * (c)) + sb.fs_cgoffset * ((c) & ~sb.fs_cgmask))  + sb.fs_cblkno)      // cg block 
#define     ufs_cgcmin(fs_fpg,fs_cgoffset,fs_cgmask,fs_cblkno,c)  (((fs_fpg * (c)) + fs_cgoffset * ((c) & ~fs_cgmask))  + fs_cblkno)      // cg block 


// ================================================
// ================================================
// ================================================

typedef     int32_t           ufs_daddr_t;
#define MAXFRAG 8

// ================================================
// ===== Headers taken in FreeBSD 4.3 sources =====
// =============== sys/ufs/ffs/fs.h ===============
// ================================================

/*
 * Each disk drive contains some number of file systems.
 * A file system consists of a number of cylinder groups.
 * Each cylinder group has inodes and data.
 *
 * A file system is described by its super-block, which in turn
 * describes the cylinder groups.  The super-block is critical
 * data and is replicated in each cylinder group to protect against
 * catastrophic loss.  This is done at `newfs' time and the critical
 * super-block data does not change, so the copies need not be
 * referenced further unless disaster strikes.
 *
 * For file system fs, the offsets of the various blocks of interest
 * are given in the super block as:
 *    [fs->fs_sblkno]         Super-block
 *    [fs->fs_cblkno]         Cylinder group block
 *    [fs->fs_iblkno]         Inode blocks
 *    [fs->fs_dblkno]         Data blocks
 * The beginning of cylinder group cg in fs, is given by
 * the ``cgbase(fs, cg)'' macro.
 *
 * The first boot and super blocks are given in absolute disk addresses.
 * The byte-offset forms are preferred, as they don't imply a sector size.
 */
#define BBSIZE          8192
#define SBSIZE          8192
#define     BBOFF       ((off_t)(0))
#define     SBOFF       ((off_t)(BBOFF + BBSIZE))
#define     BBLOCK            ((ufs_daddr_t)(0))
#define     SBLOCK            ((ufs_daddr_t)(BBLOCK + BBSIZE / DEV_BSIZE))

/*
 * Addresses stored in inodes are capable of addressing fragments
 * of `blocks'. File system blocks of at most size MAXBSIZE can
 * be optionally broken into 2, 4, or 8 pieces, each of which is
 * addressable; these pieces may be DEV_BSIZE, or some multiple of
 * a DEV_BSIZE unit.
 *
 * Large files consist of exclusively large data blocks.  To avoid
 * undue wasted disk space, the last data block of a small file may be
 * allocated as only as many fragments of a large block as are
 * necessary.  The file system format retains only a single pointer
 * to such a fragment, which is a piece of a single large block that
 * has been divided.  The size of such a fragment is determinable from
 * information in the inode, using the ``blksize(fs, ip, lbn)'' macro.
 *
 * The file system records space availability at the fragment level;
 * to determine block availability, aligned fragments are examined.
 */

/*
 * MINBSIZE is the smallest allowable block size.
 * In order to insure that it is possible to create files of size
 * 2^32 with only two levels of indirection, MINBSIZE is set to 4096.
 * MINBSIZE must be big enough to hold a cylinder group block,
 * thus changes to (struct cg) must keep its size within MINBSIZE.
 * Note that super blocks are always of size SBSIZE,
 * and that both SBSIZE and MAXBSIZE must be >= MINBSIZE.
 */
#define MINBSIZE  4096

/*
 * The path name on which the file system is mounted is maintained
 * in fs_fsmnt. MAXMNTLEN defines the amount of space allocated in
 * the super block for this name.
 */
#define MAXMNTLEN 512

/*
 * There is a 128-byte region in the superblock reserved for in-core
 * pointers to summary information. Originally this included an array
 * of pointers to blocks of struct csum; now there are just two
 * pointers and the remaining space is padded with fs_ocsp[].
 *
 * NOCSPTRS determines the size of this padding. One pointer (fs_csp)
 * is taken away to point to a contiguous array of struct csum for
 * all cylinder groups; a second (fs_maxcluster) points to an array
 * of cluster sizes that is computed as cylinder groups are inspected.
 */
#define     NOCSPTRS    ((128 / sizeof(void *)) - 2)

/*
 * A summary of contiguous blocks of various sizes is maintained
 * in each cylinder group. Normally this is set by the initial
 * value of fs_maxcontig. To conserve space, a maximum summary size
 * is set by FS_MAXCONTIG.
 */
#define FS_MAXCONTIG    16

/*
 * MINFREE gives the minimum acceptable percentage of file system
 * blocks which may be free. If the freelist drops below this level
 * only the superuser may continue to allocate blocks. This may
 * be set to 0 if no reserve of free blocks is deemed necessary,
 * however throughput drops by fifty percent if the file system
 * is run at between 95% and 100% full; thus the minimum default
 * value of fs_minfree is 5%. However, to get good clustering
 * performance, 10% is a better choice. hence we use 10% as our
 * default value. With 10% free space, fragmentation is not a
 * problem, so we choose to optimize for time.
 */
#define MINFREE         8
#define DEFAULTOPT      FS_OPTTIME

/*
 * Per cylinder group information; summarized in blocks allocated
 * from first cylinder group data blocks.  These blocks have to be
 * read in from fs_csaddr (size fs_cssize) in addition to the
 * super block.
 */
struct csum 
{
  int32_t   cs_ndir;          /* number of directories */
  int32_t   cs_nbfree;        /* number of free blocks */
  int32_t   cs_nifree;        /* number of free inodes */
  int32_t   cs_nffree;        /* number of free frags */
};

/*
 * Super block for an FFS file system.
 */
struct ufsSuperBlock 
{
  int32_t    fs_firstfield;         /* historic file system linked list, */
  int32_t    fs_unused_1;           /* used for incore super blocks */
  ufs_daddr_t fs_sblkno;            /* addr of super-block in filesys */
  ufs_daddr_t fs_cblkno;            /* offset of cyl-block in filesys */
  ufs_daddr_t fs_iblkno;            /* offset of inode-blocks in filesys */
  ufs_daddr_t fs_dblkno;            /* offset of first data after cg */
  int32_t    fs_cgoffset;           /* cylinder group offset in cylinder */
  int32_t    fs_cgmask;       /* used to calc mod fs_ntrak */
  time_t     fs_time;         /* last time written */
  int32_t    fs_size;         /* number of blocks in fs */
  int32_t    fs_dsize;        /* number of data blocks in fs */
  int32_t    fs_ncg;          /* number of cylinder groups */
  int32_t    fs_bsize;        /* size of basic blocks in fs */
  int32_t    fs_fsize;        /* size of frag blocks in fs */
  int32_t    fs_frag;         /* number of frags in a block in fs */
  /* these are configuration parameters */
  int32_t    fs_minfree;            /* minimum percentage of free blocks */
  int32_t    fs_rotdelay;           /* num of ms for optimal next block */
  int32_t    fs_rps;          /* disk revolutions per second */
  /* these fields can be computed from the others */
  int32_t    fs_bmask;        /* ``blkoff'' calc of blk offsets */
  int32_t    fs_fmask;        /* ``fragoff'' calc of frag offsets */
  int32_t    fs_bshift;       /* ``lblkno'' calc of logical blkno */
  int32_t    fs_fshift;       /* ``numfrags'' calc number of frags */
  /* these are configuration parameters */
  int32_t    fs_maxcontig;          /* max number of contiguous blks */
  int32_t    fs_maxbpg;       /* max number of blks per cyl group */
  /* these fields can be computed from the others */
  int32_t    fs_fragshift;          /* block to frag shift */
  int32_t    fs_fsbtodb;            /* fsbtodb and dbtofsb shift constant */
  int32_t    fs_sbsize;       /* actual size of super block */
  int32_t    fs_csmask;       /* csum block offset (now unused) */
  int32_t    fs_csshift;            /* csum block number (now unused) */
  int32_t    fs_nindir;       /* value of NINDIR */
  int32_t    fs_inopb;        /* value of INOPB */
  int32_t    fs_nspf;         /* value of NSPF */
  /* yet another configuration parameter */
  int32_t    fs_optim;        /* optimization preference, see below */
  /* these fields are derived from the hardware */
  int32_t    fs_npsect;       /* # sectors/track including spares */
  int32_t    fs_interleave;         /* hardware sector interleave */
  int32_t    fs_trackskew;          /* sector 0 skew, per track */
  /* fs_id takes the space of the unused fs_headswitch and fs_trkseek fields */
  int32_t    fs_id[2];        /* unique filesystem id */
  /* sizes determined by number of cylinder groups and their sizes */
  ufs_daddr_t fs_csaddr;            /* blk addr of cyl grp summary area */
  int32_t    fs_cssize;       /* size of cyl grp summary area */
  int32_t    fs_cgsize;       /* cylinder group size */
  /* these fields are derived from the hardware */
  int32_t    fs_ntrak;        /* tracks per cylinder */
  int32_t    fs_nsect;        /* sectors per track */
  int32_t  fs_spc;                  /* sectors per cylinder */
  /* this comes from the disk driver partitioning */
  int32_t    fs_ncyl;         /* cylinders in file system */
  /* these fields can be computed from the others */
  int32_t    fs_cpg;                /* cylinders per group */
  int32_t    fs_ipg;                /* inodes per group */
  int32_t    fs_fpg;                /* blocks per group * fs_frag */
  /* this data must be re-computed after crashes */
  struct    csum fs_cstotal;  /* cylinder summary information */
  /* these fields are cleared at mount time */
  int8_t   fs_fmod;           /* super block modified flag */
  int8_t   fs_clean;          /* file system is clean flag */
  int8_t     fs_ronly;        /* mounted read-only flag */
  int8_t   fs_flags;          /* see FS_ flags below */
  u_char     fs_fsmnt[MAXMNTLEN];   /* name mounted on */
  /* these fields retain the current block allocation info */
  int32_t    fs_cgrotor;            /* last cg searched */
  void      *fs_ocsp[NOCSPTRS];     /* padding; was list of fs_cs buffers */
  struct csum *fs_csp;        /* cg summary info buffer for fs_cs */
  int32_t   *fs_maxcluster;         /* max cluster in each cyl group */
  int32_t    fs_cpc;          /* cyl per cycle in postbl */
  int16_t    fs_opostbl[16][8];     /* old rotation block list head */
  int32_t    fs_sparecon[50]; /* reserved for future constants */
  int32_t    fs_contigsumsize;      /* size of cluster summary array */ 
  int32_t    fs_maxsymlinklen;      /* max length of an internal symlink */
  int32_t    fs_inodefmt;           /* format of on-disk inodes */
  u_int64_t fs_maxfilesize;   /* maximum representable file size */
  int64_t    fs_qbmask;       /* ~fs_bmask for use with 64-bit size */
  int64_t    fs_qfmask;       /* ~fs_fmask for use with 64-bit size */
  int32_t    fs_state;        /* validate fs_clean field */
  int32_t    fs_postblformat; /* format of positional layout tables */
  int32_t    fs_nrpos;        /* number of rotational positions */
  int32_t    fs_postbloff;          /* (u_int16) rotation block list head */
  int32_t    fs_rotbloff;           /* (u_int8) blocks for each rotation */
  int32_t    fs_magic;        /* magic number */
  u_int8_t fs_space[1];       /* list of blocks for each rotation */
  /* actually longer */
};

/*
 * Filesystem identification
 */
#define     UFS_SUPER_MAGIC   0x011954    /* the fast filesystem magic number */
#define     FS_OKAY           0x7c269d38  /* superblock checksum */
#define FS_42INODEFMT   -1          /* 4.2BSD inode format */
#define FS_44INODEFMT   2           /* 4.4BSD inode format */

/*
 * Preference for optimization.
 */
#define FS_OPTTIME      0     /* minimize allocation time */
#define FS_OPTSPACE     1     /* minimize disk fragmentation */

/*
 * Filesystem flags.
 */
#define FS_UNCLEAN    0x01    /* filesystem not clean at mount */
#define FS_DOSOFTDEP  0x02    /* filesystem using soft dependencies */

/*
 * Rotational layout table format types
 */
#define FS_42POSTBLFMT        -1    /* 4.2BSD rotational table format */
#define FS_DYNAMICPOSTBLFMT   1     /* dynamic rotational table format */
/*
 * Macros for access to superblock array structures
 */
#define fs_postbl(fs, cylno) \
    (((fs)->fs_postblformat == FS_42POSTBLFMT) \
    ? ((fs)->fs_opostbl[cylno]) \
    : ((int16_t *)((u_int8_t *)(fs) + \
      (fs)->fs_postbloff) + (cylno) * (fs)->fs_nrpos))
#define fs_rotbl(fs) \
    (((fs)->fs_postblformat == FS_42POSTBLFMT) \
    ? ((fs)->fs_space) \
    : ((u_int8_t *)((u_int8_t *)(fs) + (fs)->fs_rotbloff)))

/*
 * The size of a cylinder group is calculated by CGSIZE. The maximum size
 * is limited by the fact that cylinder groups are at most one block.
 * Its size is derived from the size of the maps maintained in the
 * cylinder group and the (struct cg) size.
 */
#define CGSIZE(fs) \
    /* base cg */ (sizeof(struct cg) + sizeof(int32_t) + \
    /* blktot size */   (fs)->fs_cpg * sizeof(int32_t) + \
    /* blks size */     (fs)->fs_cpg * (fs)->fs_nrpos * sizeof(int16_t) + \
    /* inode map */     howmany((fs)->fs_ipg, NBBY) + \
    /* block map */     howmany((fs)->fs_cpg * (fs)->fs_spc / NSPF(fs), NBBY) +\
    /* if present */    ((fs)->fs_contigsumsize <= 0 ? 0 : \
    /* cluster sum */   (fs)->fs_contigsumsize * sizeof(int32_t) + \
    /* cluster map */   howmany((fs)->fs_cpg * (fs)->fs_spc / NSPB(fs), NBBY)))

/*
 * Convert cylinder group to base address of its global summary info.
 */
#define fs_cs(fs, indx) fs_csp[indx]

/*
 * Cylinder group block for a file system.
 */
#define     CG_MAGIC    0x090255
struct cylinderGroupHeader 
{
  int32_t    cg_firstfield;         /* historic cyl groups linked list */
  int32_t    cg_magic;        /* magic number */
  time_t     cg_time;         /* time last written */
  int32_t    cg_cgx;          /* we are the cgx'th cylinder group */
  int16_t    cg_ncyl;         /* number of cyl's this cg */
  int16_t    cg_niblk;        /* number of inode blocks this cg */
  int32_t    cg_ndblk;        /* number of data blocks this cg */
  struct     csum cg_cs;            /* cylinder summary information */
  int32_t    cg_rotor;        /* position of last used block */
  int32_t    cg_frotor;       /* position of last used frag */
  int32_t    cg_irotor;       /* position of last used inode */
  int32_t    cg_frsum[MAXFRAG];     /* counts of available frags */
  int32_t    cg_btotoff;            /* (int32) block totals per cylinder */
  int32_t    cg_boff;         /* (u_int16) free block positions */
  int32_t    cg_iusedoff;           /* (u_int8) used inode map */
  int32_t    cg_freeoff;            /* (u_int8) free block map */
  int32_t    cg_nextfreeoff;  /* (u_int8) next available space */
  int32_t    cg_clustersumoff;      /* (u_int32) counts of avail clusters */
  int32_t    cg_clusteroff;         /* (u_int8) free cluster map */
  int32_t    cg_nclusterblks; /* number of clusters this cg */
  int32_t    cg_sparecon[13]; /* reserved for future use */
  u_int8_t cg_space[1];       /* space for cylinder group maps */
  /* actually longer */
};

/*
 * Macros for access to cylinder group array structures
 */
#define cg_blktot(cgp) \
    (((cgp)->cg_magic != CG_MAGIC) \
    ? (((struct ocg *)(cgp))->cg_btot) \
    : ((int32_t *)((u_int8_t *)(cgp) + (cgp)->cg_btotoff)))
#define cg_blks(fs, cgp, cylno) \
    (((cgp)->cg_magic != CG_MAGIC) \
    ? (((struct ocg *)(cgp))->cg_b[cylno]) \
    : ((int16_t *)((u_int8_t *)(cgp) + \
      (cgp)->cg_boff) + (cylno) * (fs)->fs_nrpos))
#define cg_inosused(cgp) \
    (((cgp)->cg_magic != CG_MAGIC) \
    ? (((struct ocg *)(cgp))->cg_iused) \
    : ((u_int8_t *)((u_int8_t *)(cgp) + (cgp)->cg_iusedoff)))
#define cg_blksfree(cgp) \
    (((cgp)->cg_magic != CG_MAGIC) \
    ? (((struct ocg *)(cgp))->cg_free) \
    : ((u_int8_t *)((u_int8_t *)(cgp) + (cgp)->cg_freeoff)))
#define cg_chkmagic(cgp) \
    ((cgp)->cg_magic == CG_MAGIC || ((struct ocg *)(cgp))->cg_magic == CG_MAGIC)
#define cg_clustersfree(cgp) \
    ((u_int8_t *)((u_int8_t *)(cgp) + (cgp)->cg_clusteroff))
#define cg_clustersum(cgp) \
    ((int32_t *)((u_int8_t *)(cgp) + (cgp)->cg_clustersumoff))

/*
 * Turn file system block numbers into disk block addresses.
 * This maps file system blocks to device size blocks.
 */
#define fsbtodb(fs, b)  ((b) << (fs)->fs_fsbtodb)
#define     dbtofsb(fs, b)    ((b) >> (fs)->fs_fsbtodb)

/*
 * Cylinder group macros to locate things in cylinder groups.
 * They calc file system addresses of cylinder group data structures.
 */
#define     cgbase(fs, c)     ((ufs_daddr_t)((fs)->fs_fpg * (c)))
#define     cgdmin(fs, c)     (cgstart(fs, c) + (fs)->fs_dblkno)  /* 1st data */
#define     cgimin(fs, c)     (cgstart(fs, c) + (fs)->fs_iblkno)  /* inode blk */
#define     cgsblock(fs, c)   (cgstart(fs, c) + (fs)->fs_sblkno)  /* super blk */
#define     cgtod(fs, c)      (cgstart(fs, c) + (fs)->fs_cblkno)  /* cg block */
#define cgstart(fs, c)                                      \
      (cgbase(fs, c) + (fs)->fs_cgoffset * ((c) & ~((fs)->fs_cgmask)))

/*
 * Macros for handling inode numbers:
 *     inode number to file system block offset.
 *     inode number to cylinder group number.
 *     inode number to file system block address.
 */
#define     ino_to_cg(fs, x)  ((x) / (fs)->fs_ipg)
#define     ino_to_fsba(fs, x)                                    \
      ((ufs_daddr_t)(cgimin(fs, ino_to_cg(fs, x)) +               \
          (blkstofrags((fs), (((x) % (fs)->fs_ipg) / INOPB(fs))))))
#define     ino_to_fsbo(fs, x)      ((x) % INOPB(fs))

/*
 * Give cylinder group number for a file system block.
 * Give cylinder group block number for a file system block.
 */
#define     dtog(fs, d) ((d) / (fs)->fs_fpg)
#define     dtogd(fs, d)      ((d) % (fs)->fs_fpg)

/*
 * Extract the bits for a block from a map.
 * Compute the cylinder and rotational position of a cyl block addr.
 */
#define blkmap(fs, map, loc) \
    (((map)[(loc) / NBBY] >> ((loc) % NBBY)) & (0xff >> (NBBY - (fs)->fs_frag)))
#define cbtocylno(fs, bno) \
    ((bno) * NSPF(fs) / (fs)->fs_spc)
#define cbtorpos(fs, bno) \
    (((bno) * NSPF(fs) % (fs)->fs_spc / (fs)->fs_nsect * (fs)->fs_trackskew + \
     (bno) * NSPF(fs) % (fs)->fs_spc % (fs)->fs_nsect * (fs)->fs_interleave) % \
     (fs)->fs_nsect * (fs)->fs_nrpos / (fs)->fs_npsect)

/*
 * The following macros optimize certain frequently calculated
 * quantities by using shifts and masks in place of divisions
 * modulos and multiplications.
 */
#define blkoff(fs, loc)       /* calculates (loc % fs->fs_bsize) */ \
      ((loc) & (fs)->fs_qbmask)
#define fragoff(fs, loc)      /* calculates (loc % fs->fs_fsize) */ \
      ((loc) & (fs)->fs_qfmask)
#define lblktosize(fs, blk)   /* calculates ((off_t)blk * fs->fs_bsize) */ \
      ((off_t)(blk) << (fs)->fs_bshift)
/* Use this only when `blk' is known to be small, e.g., < NDADDR. */
#define smalllblktosize(fs, blk)    /* calculates (blk * fs->fs_bsize) */ \
      ((blk) << (fs)->fs_bshift)
#define lblkno(fs, loc)       /* calculates (loc / fs->fs_bsize) */ \
      ((loc) >> (fs)->fs_bshift)
#define numfrags(fs, loc)     /* calculates (loc / fs->fs_fsize) */ \
      ((loc) >> (fs)->fs_fshift)
#define blkroundup(fs, size)  /* calculates roundup(size, fs->fs_bsize) */ \
      (((size) + (fs)->fs_qbmask) & (fs)->fs_bmask)
#define fragroundup(fs, size) /* calculates roundup(size, fs->fs_fsize) */ \
      (((size) + (fs)->fs_qfmask) & (fs)->fs_fmask)
#define fragstoblks(fs, frags)      /* calculates (frags / fs->fs_frag) */ \
      ((frags) >> (fs)->fs_fragshift)
#define blkstofrags(fs, blks) /* calculates (blks * fs->fs_frag) */ \
      ((blks) << (fs)->fs_fragshift)
#define fragnum(fs, fsb)      /* calculates (fsb % fs->fs_frag) */ \
      ((fsb) & ((fs)->fs_frag - 1))
#define blknum(fs, fsb)       /* calculates rounddown(fsb, fs->fs_frag) */ \
      ((fsb) &~ ((fs)->fs_frag - 1))

/*
 * Determine the number of available frags given a
 * percentage to hold in reserve.
 */
#define freespace(fs, percentreserved) \
      (blkstofrags((fs), (fs)->fs_cstotal.cs_nbfree) + \
      (fs)->fs_cstotal.cs_nffree - \
      ((off_t)((fs)->fs_dsize) * (percentreserved) / 100))

/*
 * Determining the size of a file block in the file system.
 */
#define blksize(fs, ip, lbn) \
      (((lbn) >= NDADDR || (ip)->i_size >= smalllblktosize(fs, (lbn) + 1)) \
          ? (fs)->fs_bsize \
          : (fragroundup(fs, blkoff(fs, (ip)->i_size))))
#define dblksize(fs, dip, lbn) \
      (((lbn) >= NDADDR || (dip)->di_size >= smalllblktosize(fs, (lbn) + 1)) \
          ? (fs)->fs_bsize \
          : (fragroundup(fs, blkoff(fs, (dip)->di_size))))
#define sblksize(fs, size, lbn) \
      (((lbn) >= NDADDR || (size) >= ((lbn) + 1) << (fs)->fs_bshift) \
        ? (fs)->fs_bsize \
        : (fragroundup(fs, blkoff(fs, (size)))))


/*
 * Number of disk sectors per block/fragment; assumes DEV_BSIZE byte
 * sector size.
 */
#define     NSPB(fs)    ((fs)->fs_nspf << (fs)->fs_fragshift)
#define     NSPF(fs)    ((fs)->fs_nspf)

/*
 * Number of inodes in a secondary storage block/fragment.
 */
#define     INOPB(fs)   ((fs)->fs_inopb)
#define     INOPF(fs)   ((fs)->fs_inopb >> (fs)->fs_fragshift)

/*
 * Number of indirects in a file system block.
 */
#define     NINDIR(fs)  ((fs)->fs_nindir)


// ================================================
// ================================================
// ================================================

// ================================================
struct CInfoUfsHeader // size must be 16384 (adjust the reserved data)
{
  DWORD dwCylinderGroupsCount;
  DWORD fs_fpg;
  DWORD fs_cgoffset;
  DWORD fs_cgmask;
  DWORD fs_cblkno;
  DWORD dwFragsPerBlock; // number of frags in a block in fs
  DWORD dwCylinderGroupSize; // cylinder group size
  DWORD dwBasicBlockSize;
  QWORD qwDataFrags;
  BYTE cReserved[16344]; // Adjust to fit with total header size
};

// ================================================
class CUfsPart: public CFSBase
{
public:
  CUfsPart(char *szDevice, FILE *fDeviceFile, QWORD qwPartSize);
  ~CUfsPart();
  
  virtual void printfInformations();
  virtual void readBitmap(COptions *options);
  virtual void readSuperBlock();
  virtual void fsck();
  virtual void* getInfos() {return (void*)&m_info;}

 private:
  CInfoUfsHeader m_info;
};

// ================================================
// ================================================
// ================================================

#define     MAXUFSPARTITIONS  22
//#define UFS_MAGIC     ((u_int32_t)0x57455682) // The UFS magic number
#define UFS_MAGIC ((u_int32_t)0x82564557) // The UFS magic number

#ifndef __LINUX_UFS_FS_H
#define UFS_BBLOCK 0
#define UFS_BBSIZE 8192
#define UFS_SBLOCK 8192
#define UFS_SBSIZE 8192

#define UFS_SECTOR_SIZE 512
#define UFS_SECTOR_BITS 9
#endif


// ================================================
struct CUFSPartition // the partition table
{     
  u_int32_t p_size;     // number of sectors in partition   
  u_int32_t p_offset;   // starting sector   
  u_int32_t p_fsize;    // filesystem basic fragment size   
  u_int8_t p_fstype;    // filesystem type, see below   
  u_int8_t p_frag;      // filesystem fragments per block   
  union 
  {
    u_int16_t cpg;      // UFS: FS cylinders per group   
    u_int16_t sgs;      // LFS: FS segment shift   
  };
//#define   p_cpg __partition_u1.cpg
//#define   p_sgs __partition_u1.sgs
};

// ================================================
struct CUFSDiskLabel 
{
  u_int32_t d_magic;          // the magic number 
  u_int16_t d_type;           // drive type 
  u_int16_t d_subtype;        // controller/d_type specific 
  char        d_typename[16]; // type name, e.g. "eagle" 
  
  /*
   * d_packname contains the pack identifier and is returned when
   * the disklabel is read off the disk or in-core copy.
   * d_boot0 and d_boot1 are the (optional) names of the
   * primary (block 0) and secondary (block 1-15) bootstraps
   * as found in /usr/mdec.  These are returned when using
   * getdiskbyname(3) to retrieve the values from /etc/disktab.
   */
  union 
  {
    char un_d_packname[16];   // pack identifier 
    struct 
    {
      char *un_d_boot0; /* primary bootstrap name */
      char *un_d_boot1; /* secondary bootstrap name */
    } un_b;
  } d_un;
#define d_packname      d_un.un_d_packname
#define d_boot0         d_un.un_b.un_d_boot0
#define d_boot1         d_un.un_b.un_d_boot1
  
  /* disk geometry: */
  u_int32_t d_secsize;        /* # of bytes per sector */
  u_int32_t d_nsectors;       /* # of data sectors per track */
  u_int32_t d_ntracks;        /* # of tracks per cylinder */
  u_int32_t d_ncylinders;           /* # of data cylinders per unit */
  u_int32_t d_secpercyl;            /* # of data sectors per cylinder */
  u_int32_t d_secperunit;           /* # of data sectors per unit */
  
  /*
   * Spares (bad sector replacements) below are not counted in
   * d_nsectors or d_secpercyl.  Spare sectors are assumed to
   * be physical sectors which occupy space at the end of each
   * track and/or cylinder.
   */
  u_int16_t d_sparespertrack; /* # of spare sectors per track */
  u_int16_t d_sparespercyl;   /* # of spare sectors per cylinder */
  /*
   * Alternate cylinders include maintenance, replacement, configuration
   * description areas, etc.
   */
  u_int32_t d_acylinders;           /* # of alt. cylinders per unit */
  
  /* hardware characteristics: */
  /*
   * d_interleave, d_trackskew and d_cylskew describe perturbations
   * in the media format used to compensate for a slow controller.
   * Interleave is physical sector interleave, set up by the
   * formatter or controller when formatting.  When interleaving is
   * in use, logically adjacent sectors are not physically
   * contiguous, but instead are separated by some number of
   * sectors.  It is specified as the ratio of physical sectors
   * traversed per logical sector.  Thus an interleave of 1:1
   * implies contiguous layout, while 2:1 implies that logical
   * sector 0 is separated by one sector from logical sector 1.
   * d_trackskew is the offset of sector 0 on track N relative to
   * sector 0 on track N-1 on the same cylinder.  Finally, d_cylskew
   * is the offset of sector 0 on cylinder N relative to sector 0
   * on cylinder N-1.
   */
  u_int16_t d_rpm;            /* rotational speed */
  u_int16_t d_interleave;           /* hardware sector interleave */
  u_int16_t d_trackskew;            /* sector 0 skew, per track */
  u_int16_t d_cylskew;        /* sector 0 skew, per cylinder */
  u_int32_t d_headswitch;           /* head switch time, usec */
  u_int32_t d_trkseek;        /* track-to-track seek, usec */
  u_int32_t d_flags;          /* generic flags */
#define NDDATA 5
  u_int32_t d_drivedata[NDDATA];    /* drive-type specific information */
#define NSPARE 5
  u_int32_t d_spare[NSPARE];  /* reserved for future use */
  u_int32_t d_magic2;         /* the magic number (again) */
  u_int16_t d_checksum;       /* xor of data incl. partitions */
  
  /* filesystem and partition information: */
  u_int16_t d_npartitions;    /* number of partitions in following */
  u_int32_t d_bbsize;         /* size of boot area at sn0, bytes */
  u_int32_t d_sbsize;         /* max size of fs superblock, bytes */
  CUFSPartition d_partitions[MAXUFSPARTITIONS]; /* actually may be more */
};

/*static char *fstypenames[] = 
{
  "unused", "swap", "Version6", "Version7", "SystemV", "4.1BSD", "Eighth-Edition", "4.2BSD",
    "MSDOS", "4.4LFS", "unknown", "HPFS", "ISO9660", "boot", "ADOS", "HFS", "ADFS", "ext2fs",
    "ccd", "RAID", NULL
};*/

#endif // FS_UFS_H

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