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/*

 *  linux/include/linux/ufs_fs.h

 *

 * Copyright (C) 1996

 * Adrian Rodriguez (adrian@franklins-tower.rutgers.edu)

 * Laboratory for Computer Science Research Computing Facility

 * Rutgers, The State University of New Jersey

 *

 * Clean swab support by Fare <fare@tunes.org>

 * just hope no one is using NNUUXXI on __?64 structure elements

 * 64-bit clean thanks to Maciej W. Rozycki <macro@ds2.pg.gda.pl>

 *

 * 4.4BSD (FreeBSD) support added on February 1st 1998 by

 * Niels Kristian Bech Jensen <nkbj@image.dk> partially based

 * on code by Martin von Loewis <martin@mira.isdn.cs.tu-berlin.de>.

 *

 * NeXTstep support added on February 5th 1998 by

 * Niels Kristian Bech Jensen <nkbj@image.dk>.

 *

 * Write support by Daniel Pirkl <daniel.pirkl@email.cz>

 *

 * HP/UX hfs filesystem support added by

 * Martin K. Petersen <mkp@mkp.net>, August 1999

 *

 * UFS2 (of FreeBSD 5.x) support added by

 * Niraj Kumar <niraj17@iitbombay.org>  , Jan 2004

 *

 */

#ifndef __LINUX_UFS_FS_H

#define __LINUX_UFS_FS_H

#include <linux/types.h>

#include <linux/kernel.h>

#include <linux/stat.h>

#include <linux/fs.h>

#ifndef __KERNEL__

typedef __u64 __fs64;

typedef __u32 __fs32;

typedef __u16 __fs16;

#else

#include <asm/div64.h>

typedef __u64 __bitwise __fs64;

typedef __u32 __bitwise __fs32;

typedef __u16 __bitwise __fs16;

#endif

#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

#define UFS_MAGIC  0x00011954

#define UFS2_MAGIC 0x19540119

#define UFS_CIGAM  0x54190100 /* byteswapped MAGIC */

/* Copied from FreeBSD */

/*

 * Each disk drive contains some number of filesystems.

 * A filesystem consists of a number of cylinder groups.

 * Each cylinder group has inodes and data.

 *

 * A filesystem 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 filesystem 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.

 *

 * Depending on the architecture and the media, the superblock may

 * reside in any one of four places. For tiny media where every block

 * counts, it is placed at the very front of the partition. Historically,

 * UFS1 placed it 8K from the front to leave room for the disk label and

 * a small bootstrap. For UFS2 it got moved to 64K from the front to leave

 * room for the disk label and a bigger bootstrap, and for really piggy

 * systems we check at 256K from the front if the first three fail. In

 * all cases the size of the superblock will be SBLOCKSIZE. All values are

 * given in byte-offset form, so they do not imply a sector size. The

 * SBLOCKSEARCH specifies the order in which the locations should be searched.

 */

#define SBLOCK_FLOPPY        0

#define SBLOCK_UFS1       8192

#define SBLOCK_UFS2      65536

#define SBLOCK_PIGGY    262144

#define SBLOCKSIZE        8192

#define SBLOCKSEARCH \

        { SBLOCK_UFS2, SBLOCK_UFS1, SBLOCK_FLOPPY, SBLOCK_PIGGY, -1 }

/* HP specific MAGIC values */

#define UFS_MAGIC_LFN   0x00095014 /* fs supports filenames > 14 chars */

#define UFS_CIGAM_LFN   0x14500900 /* srahc 41 < semanelif stroppus sf */

#define UFS_MAGIC_SEC   0x00612195 /* B1 security fs */

#define UFS_CIGAM_SEC   0x95216100

#define UFS_MAGIC_FEA   0x00195612 /* fs_featurebits supported */

#define UFS_CIGAM_FEA   0x12561900

#define UFS_MAGIC_4GB   0x05231994 /* fs > 4 GB && fs_featurebits */

#define UFS_CIGAM_4GB   0x94192305

/* Seems somebody at HP goofed here. B1 and lfs are both 0x2 !?! */

#define UFS_FSF_LFN     0x00000001 /* long file names */

#define UFS_FSF_B1      0x00000002 /* B1 security */

#define UFS_FSF_LFS     0x00000002 /* large files */

#define UFS_FSF_LUID    0x00000004 /* large UIDs */

/* End of HP stuff */

#define UFS_BSIZE       8192

#define UFS_MINBSIZE    4096

#define UFS_FSIZE       1024

#define UFS_MAXFRAG     (UFS_BSIZE / UFS_FSIZE)

#define UFS_NDADDR 12

#define UFS_NINDIR 3

#define UFS_IND_BLOCK   (UFS_NDADDR + 0)

#define UFS_DIND_BLOCK  (UFS_NDADDR + 1)

#define UFS_TIND_BLOCK  (UFS_NDADDR + 2)

#define UFS_NDIR_FRAGMENT (UFS_NDADDR << uspi->s_fpbshift)

#define UFS_IND_FRAGMENT (UFS_IND_BLOCK << uspi->s_fpbshift)

#define UFS_DIND_FRAGMENT (UFS_DIND_BLOCK << uspi->s_fpbshift)

#define UFS_TIND_FRAGMENT (UFS_TIND_BLOCK << uspi->s_fpbshift)

#define UFS_ROOTINO 2

#define UFS_FIRST_INO (UFS_ROOTINO + 1)

#define UFS_USEEFT  ((__u16)65535)

#define UFS_FSOK      0x7c269d38

#define UFS_FSACTIVE  ((__s8)0x00)

#define UFS_FSCLEAN   ((__s8)0x01)

#define UFS_FSSTABLE  ((__s8)0x02)

#define UFS_FSOSF1    ((__s8)0x03)      /* is this correct for DEC OSF/1? */

#define UFS_FSBAD     ((__s8)0xff)

/* From here to next blank line, s_flags for ufs_sb_info */

/* directory entry encoding */

#define UFS_DE_MASK             0x00000010      /* mask for the following */

#define UFS_DE_OLD              0x00000000

#define UFS_DE_44BSD            0x00000010

/* uid encoding */

#define UFS_UID_MASK            0x00000060      /* mask for the following */

#define UFS_UID_OLD             0x00000000

#define UFS_UID_44BSD           0x00000020

#define UFS_UID_EFT             0x00000040

/* superblock state encoding */

#define UFS_ST_MASK             0x00000700      /* mask for the following */

#define UFS_ST_OLD              0x00000000

#define UFS_ST_44BSD            0x00000100

#define UFS_ST_SUN              0x00000200 /* Solaris */

#define UFS_ST_SUNOS            0x00000300

#define UFS_ST_SUNx86           0x00000400 /* Solaris x86 */

/*cylinder group encoding */

#define UFS_CG_MASK             0x00003000      /* mask for the following */

#define UFS_CG_OLD              0x00000000

#define UFS_CG_44BSD            0x00002000

#define UFS_CG_SUN              0x00001000

/* filesystem type encoding */

#define UFS_TYPE_MASK           0x00010000      /* mask for the following */

#define UFS_TYPE_UFS1           0x00000000

#define UFS_TYPE_UFS2           0x00010000

/* fs_inodefmt options */

#define UFS_42INODEFMT  -1

#define UFS_44INODEFMT  2

/*

 * 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 UFS_MINFREE         5

#define UFS_DEFAULTOPT      UFS_OPTTIME

/*

 * Turn file system block numbers into disk block addresses.

 * This maps file system blocks to device size blocks.

 */

#define ufs_fsbtodb(uspi, b)    ((b) << (uspi)->s_fsbtodb)

#define ufs_dbtofsb(uspi, b)    ((b) >> (uspi)->s_fsbtodb)

/*

 * Cylinder group macros to locate things in cylinder groups.

 * They calc file system addresses of cylinder group data structures.

 */

#define ufs_cgbase(c)   (uspi->s_fpg * (c))

#define ufs_cgstart(c)  ((uspi)->fs_magic == UFS2_MAGIC ?  ufs_cgbase(c) : \

        (ufs_cgbase(c)  + uspi->s_cgoffset * ((c) & ~uspi->s_cgmask)))

#define ufs_cgsblock(c) (ufs_cgstart(c) + uspi->s_sblkno)       /* super blk */

#define ufs_cgcmin(c)   (ufs_cgstart(c) + uspi->s_cblkno)       /* cg block */

#define ufs_cgimin(c)   (ufs_cgstart(c) + uspi->s_iblkno)       /* inode blk */

#define ufs_cgdmin(c)   (ufs_cgstart(c) + uspi->s_dblkno)       /* 1st data */

/*

 * 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 ufs_inotocg(x)          ((x) / uspi->s_ipg)

#define ufs_inotocgoff(x)       ((x) % uspi->s_ipg)

#define ufs_inotofsba(x)        (((u64)ufs_cgimin(ufs_inotocg(x))) + ufs_inotocgoff(x) / uspi->s_inopf)

#define ufs_inotofsbo(x)        ((x) % uspi->s_inopf)

/*

 * Compute the cylinder and rotational position of a cyl block addr.

 */

#define ufs_cbtocylno(bno) \

        ((bno) * uspi->s_nspf / uspi->s_spc)

#define ufs_cbtorpos(bno) \

        ((((bno) * uspi->s_nspf % uspi->s_spc / uspi->s_nsect \

        * uspi->s_trackskew + (bno) * uspi->s_nspf % uspi->s_spc \

        % uspi->s_nsect * uspi->s_interleave) % uspi->s_nsect \

        * uspi->s_nrpos) / uspi->s_npsect)

/*

 * The following macros optimize certain frequently calculated

 * quantities by using shifts and masks in place of divisions

 * modulos and multiplications.

 */

#define ufs_blkoff(loc)         ((loc) & uspi->s_qbmask)

#define ufs_fragoff(loc)        ((loc) & uspi->s_qfmask)

#define ufs_lblktosize(blk)     ((blk) << uspi->s_bshift)

#define ufs_lblkno(loc)         ((loc) >> uspi->s_bshift)

#define ufs_numfrags(loc)       ((loc) >> uspi->s_fshift)

#define ufs_blkroundup(size)    (((size) + uspi->s_qbmask) & uspi->s_bmask)

#define ufs_fragroundup(size)   (((size) + uspi->s_qfmask) & uspi->s_fmask)

#define ufs_fragstoblks(frags)  ((frags) >> uspi->s_fpbshift)

#define ufs_blkstofrags(blks)   ((blks) << uspi->s_fpbshift)

#define ufs_fragnum(fsb)        ((fsb) & uspi->s_fpbmask)

#define ufs_blknum(fsb)         ((fsb) & ~uspi->s_fpbmask)

#define UFS_MAXNAMLEN 255

#define UFS_MAXMNTLEN 512

#define UFS2_MAXMNTLEN 468

#define UFS2_MAXVOLLEN 32

#define UFS_MAXCSBUFS 31

#define UFS_LINK_MAX 32000

/*

#define UFS2_NOCSPTRS   ((128 / sizeof(void *)) - 4)

*/

#define UFS2_NOCSPTRS   28

/*

 * UFS_DIR_PAD defines the directory entries boundaries

 * (must be a multiple of 4)

 */

#define UFS_DIR_PAD                     4

#define UFS_DIR_ROUND                   (UFS_DIR_PAD - 1)

#define UFS_DIR_REC_LEN(name_len)       (((name_len) + 1 + 8 + UFS_DIR_ROUND) & ~UFS_DIR_ROUND)

struct ufs_timeval {

        __fs32  tv_sec;

        __fs32  tv_usec;

};

struct ufs_dir_entry {

        __fs32  d_ino;                  /* inode number of this entry */

        __fs16  d_reclen;               /* length of this entry */

        union {

                __fs16  d_namlen;               /* actual length of d_name */

                struct {

                        __u8    d_type;         /* file type */

                        __u8    d_namlen;       /* length of string in d_name */

                } d_44;

        } d_u;

        __u8    d_name[UFS_MAXNAMLEN + 1];      /* file name */

};

struct ufs_csum {

        __fs32  cs_ndir;        /* number of directories */

        __fs32  cs_nbfree;      /* number of free blocks */

        __fs32  cs_nifree;      /* number of free inodes */

        __fs32  cs_nffree;      /* number of free frags */

};

struct ufs2_csum_total {

        __fs64  cs_ndir;        /* number of directories */

        __fs64  cs_nbfree;      /* number of free blocks */

        __fs64  cs_nifree;      /* number of free inodes */

        __fs64  cs_nffree;      /* number of free frags */

        __fs64   cs_numclusters;        /* number of free clusters */

        __fs64   cs_spare[3];   /* future expansion */

};

struct ufs_csum_core {

        __u64   cs_ndir;        /* number of directories */

        __u64   cs_nbfree;      /* number of free blocks */

        __u64   cs_nifree;      /* number of free inodes */

        __u64   cs_nffree;      /* number of free frags */

        __u64   cs_numclusters; /* number of free clusters */

};

/*

 * File system flags

 */

#define UFS_UNCLEAN      0x01    /* file system not clean at mount (unused) */

#define UFS_DOSOFTDEP    0x02    /* file system using soft dependencies */

#define UFS_NEEDSFSCK    0x04    /* needs sync fsck (FreeBSD compat, unused) */

#define UFS_INDEXDIRS    0x08    /* kernel supports indexed directories */

#define UFS_ACLS         0x10    /* file system has ACLs enabled */

#define UFS_MULTILABEL   0x20    /* file system is MAC multi-label */

#define UFS_FLAGS_UPDATED 0x80   /* flags have been moved to new location */

#if 0

/*

 * This is the actual superblock, as it is laid out on the disk.

 * Do NOT use this structure, because of sizeof(ufs_super_block) > 512 and

 * it may occupy several blocks, use

 * struct ufs_super_block_(first,second,third) instead.

 */

struct ufs_super_block {

        union {

                struct {

                        __fs32  fs_link;        /* UNUSED */

                } fs_42;

                struct {

                        __fs32  fs_state;       /* file system state flag */

                } fs_sun;

        } fs_u0;

        __fs32  fs_rlink;       /* UNUSED */

        __fs32  fs_sblkno;      /* addr of super-block in filesys */

        __fs32  fs_cblkno;      /* offset of cyl-block in filesys */

        __fs32  fs_iblkno;      /* offset of inode-blocks in filesys */

        __fs32  fs_dblkno;      /* offset of first data after cg */

        __fs32  fs_cgoffset;    /* cylinder group offset in cylinder */

        __fs32  fs_cgmask;      /* used to calc mod fs_ntrak */

        __fs32  fs_time;        /* last time written -- time_t */

        __fs32  fs_size;        /* number of blocks in fs */

        __fs32  fs_dsize;       /* number of data blocks in fs */

        __fs32  fs_ncg;         /* number of cylinder groups */

        __fs32  fs_bsize;       /* size of basic blocks in fs */

        __fs32  fs_fsize;       /* size of frag blocks in fs */

        __fs32  fs_frag;        /* number of frags in a block in fs */

/* these are configuration parameters */

        __fs32  fs_minfree;     /* minimum percentage of free blocks */

        __fs32  fs_rotdelay;    /* num of ms for optimal next block */

        __fs32  fs_rps;         /* disk revolutions per second */

/* these fields can be computed from the others */

        __fs32  fs_bmask;       /* ``blkoff'' calc of blk offsets */

        __fs32  fs_fmask;       /* ``fragoff'' calc of frag offsets */

        __fs32  fs_bshift;      /* ``lblkno'' calc of logical blkno */

        __fs32  fs_fshift;      /* ``numfrags'' calc number of frags */

/* these are configuration parameters */

        __fs32  fs_maxcontig;   /* max number of contiguous blks */

        __fs32  fs_maxbpg;      /* max number of blks per cyl group */

/* these fields can be computed from the others */

        __fs32  fs_fragshift;   /* block to frag shift */

        __fs32  fs_fsbtodb;     /* fsbtodb and dbtofsb shift constant */

        __fs32  fs_sbsize;      /* actual size of super block */

        __fs32  fs_csmask;      /* csum block offset */

        __fs32  fs_csshift;     /* csum block number */

        __fs32  fs_nindir;      /* value of NINDIR */

        __fs32  fs_inopb;       /* value of INOPB */

        __fs32  fs_nspf;        /* value of NSPF */

/* yet another configuration parameter */

        __fs32  fs_optim;       /* optimization preference, see below */

/* these fields are derived from the hardware */

        union {

                struct {

                        __fs32  fs_npsect;      /* # sectors/track including spares */

                } fs_sun;

                struct {

                        __fs32  fs_state;       /* file system state time stamp */

                } fs_sunx86;

        } fs_u1;

        __fs32  fs_interleave;  /* hardware sector interleave */

        __fs32  fs_trackskew;   /* sector 0 skew, per track */

/* a unique id for this filesystem (currently unused and unmaintained) */

/* In 4.3 Tahoe this space is used by fs_headswitch and fs_trkseek */

/* Neither of those fields is used in the Tahoe code right now but */

/* there could be problems if they are.                            */

        __fs32  fs_id[2];       /* file system id */

/* sizes determined by number of cylinder groups and their sizes */

        __fs32  fs_csaddr;      /* blk addr of cyl grp summary area */

        __fs32  fs_cssize;      /* size of cyl grp summary area */

        __fs32  fs_cgsize;      /* cylinder group size */

/* these fields are derived from the hardware */

        __fs32  fs_ntrak;       /* tracks per cylinder */

        __fs32  fs_nsect;       /* sectors per track */

        __fs32  fs_spc;         /* sectors per cylinder */

/* this comes from the disk driver partitioning */

        __fs32  fs_ncyl;        /* cylinders in file system */

/* these fields can be computed from the others */

        __fs32  fs_cpg;         /* cylinders per group */

        __fs32  fs_ipg;         /* inodes per cylinder group */

        __fs32  fs_fpg;         /* blocks per group * fs_frag */

/* this data must be re-computed after crashes */

        struct ufs_csum fs_cstotal;     /* cylinder summary information */

/* these fields are cleared at mount time */

        __s8    fs_fmod;        /* super block modified flag */

        __s8    fs_clean;       /* file system is clean flag */

        __s8    fs_ronly;       /* mounted read-only flag */

        __s8    fs_flags;

        union {

                struct {

                        __s8    fs_fsmnt[UFS_MAXMNTLEN];/* name mounted on */

                        __fs32  fs_cgrotor;     /* last cg searched */

                        __fs32  fs_csp[UFS_MAXCSBUFS];/*list of fs_cs info buffers */

                        __fs32  fs_maxcluster;

                        __fs32  fs_cpc;         /* cyl per cycle in postbl */

                        __fs16  fs_opostbl[16][8]; /* old rotation block list head */

                } fs_u1;

                struct {

                        __s8  fs_fsmnt[UFS2_MAXMNTLEN]; /* name mounted on */

                        __u8   fs_volname[UFS2_MAXVOLLEN]; /* volume name */

                        __fs64  fs_swuid;               /* system-wide uid */

                        __fs32  fs_pad; /* due to alignment of fs_swuid */

                        __fs32   fs_cgrotor;     /* last cg searched */

                        __fs32   fs_ocsp[UFS2_NOCSPTRS]; /*list of fs_cs info buffers */

                        __fs32   fs_contigdirs;/*# of contiguously allocated dirs */

                        __fs32   fs_csp;        /* cg summary info buffer for fs_cs */

                        __fs32   fs_maxcluster;

                        __fs32   fs_active;/* used by snapshots to track fs */

                        __fs32   fs_old_cpc;    /* cyl per cycle in postbl */

                        __fs32   fs_maxbsize;/*maximum blocking factor permitted */

                        __fs64   fs_sparecon64[17];/*old rotation block list head */

                        __fs64   fs_sblockloc; /* byte offset of standard superblock */

                        struct  ufs2_csum_total fs_cstotal;/*cylinder summary information*/

                        struct  ufs_timeval    fs_time;         /* last time written */

                        __fs64    fs_size;              /* number of blocks in fs */

                        __fs64    fs_dsize;     /* number of data blocks in fs */

                        __fs64   fs_csaddr;     /* blk addr of cyl grp summary area */

                        __fs64    fs_pendingblocks;/* blocks in process of being freed */

                        __fs32    fs_pendinginodes;/*inodes in process of being freed */

                } fs_u2;

        }  fs_u11;

        union {

                struct {

                        __fs32  fs_sparecon[53];/* reserved for future constants */

                        __fs32  fs_reclaim;

                        __fs32  fs_sparecon2[1];

                        __fs32  fs_state;       /* file system state time stamp */

                        __fs32  fs_qbmask[2];   /* ~usb_bmask */

                        __fs32  fs_qfmask[2];   /* ~usb_fmask */

                } fs_sun;

                struct {

                        __fs32  fs_sparecon[53];/* reserved for future constants */

                        __fs32  fs_reclaim;

                        __fs32  fs_sparecon2[1];

                        __fs32  fs_npsect;      /* # sectors/track including spares */

                        __fs32  fs_qbmask[2];   /* ~usb_bmask */

                        __fs32  fs_qfmask[2];   /* ~usb_fmask */

                } fs_sunx86;

                struct {

                        __fs32  fs_sparecon[50];/* reserved for future constants */

                        __fs32  fs_contigsumsize;/* size of cluster summary array */

                        __fs32  fs_maxsymlinklen;/* max length of an internal symlink */

                        __fs32  fs_inodefmt;    /* format of on-disk inodes */

                        __fs32  fs_maxfilesize[2];      /* max representable file size */

                        __fs32  fs_qbmask[2];   /* ~usb_bmask */

                        __fs32  fs_qfmask[2];   /* ~usb_fmask */

                        __fs32  fs_state;       /* file system state time stamp */

                } fs_44;

        } fs_u2;

        __fs32  fs_postblformat;        /* format of positional layout tables */

        __fs32  fs_nrpos;               /* number of rotational positions */

        __fs32  fs_postbloff;           /* (__s16) rotation block list head */

        __fs32  fs_rotbloff;            /* (__u8) blocks for each rotation */

        __fs32  fs_magic;               /* magic number */

        __u8    fs_space[1];            /* list of blocks for each rotation */

};

#endif/*struct ufs_super_block*/

/*

 * Preference for optimization.

 */

#define UFS_OPTTIME     0        /* minimize allocation time */

#define UFS_OPTSPACE    1       /* minimize disk fragmentation */

/*

 * Rotational layout table format types

 */

#define UFS_42POSTBLFMT         -1      /* 4.2BSD rotational table format */

#define UFS_DYNAMICPOSTBLFMT    1       /* dynamic rotational table format */

/*

 * Convert cylinder group to base address of its global summary info.

 */

#define fs_cs(indx) s_csp[(indx)]

/*

 * Cylinder group block for a file system.

 *

 * Writable fields in the cylinder group are protected by the associated

 * super block lock fs->fs_lock.

 */

#define CG_MAGIC        0x090255

#define ufs_cg_chkmagic(sb, ucg) \

        (fs32_to_cpu((sb), (ucg)->cg_magic) == CG_MAGIC)

/*

 * Macros for access to old cylinder group array structures

 */

#define ufs_ocg_blktot(sb, ucg)      fs32_to_cpu((sb), ((struct ufs_old_cylinder_group *)(ucg))->cg_btot)

#define ufs_ocg_blks(sb, ucg, cylno) fs32_to_cpu((sb), ((struct ufs_old_cylinder_group *)(ucg))->cg_b[cylno])

#define ufs_ocg_inosused(sb, ucg)    fs32_to_cpu((sb), ((struct ufs_old_cylinder_group *)(ucg))->cg_iused)

#define ufs_ocg_blksfree(sb, ucg)    fs32_to_cpu((sb), ((struct ufs_old_cylinder_group *)(ucg))->cg_free)

#define ufs_ocg_chkmagic(sb, ucg) \

        (fs32_to_cpu((sb), ((struct ufs_old_cylinder_group *)(ucg))->cg_magic) == CG_MAGIC)

/*

 * size of this structure is 172 B

 */

struct  ufs_cylinder_group {

        __fs32  cg_link;                /* linked list of cyl groups */

        __fs32  cg_magic;               /* magic number */

        __fs32  cg_time;                /* time last written */

        __fs32  cg_cgx;                 /* we are the cgx'th cylinder group */

        __fs16  cg_ncyl;                /* number of cyl's this cg */

        __fs16  cg_niblk;               /* number of inode blocks this cg */

        __fs32  cg_ndblk;               /* number of data blocks this cg */

        struct  ufs_csum cg_cs;         /* cylinder summary information */

        __fs32  cg_rotor;               /* position of last used block */

        __fs32  cg_frotor;              /* position of last used frag */

        __fs32  cg_irotor;              /* position of last used inode */

        __fs32  cg_frsum[UFS_MAXFRAG];  /* counts of available frags */

        __fs32  cg_btotoff;             /* (__u32) block totals per cylinder */

        __fs32  cg_boff;                /* (short) free block positions */

        __fs32  cg_iusedoff;            /* (char) used inode map */

        __fs32  cg_freeoff;             /* (u_char) free block map */

        __fs32  cg_nextfreeoff;         /* (u_char) next available space */

        union {

                struct {

                        __fs32  cg_clustersumoff;       /* (u_int32) counts of avail clusters */

                        __fs32  cg_clusteroff;          /* (u_int8) free cluster map */

                        __fs32  cg_nclusterblks;        /* number of clusters this cg */

                        __fs32  cg_sparecon[13];        /* reserved for future use */

                } cg_44;

                struct {

                        __fs32  cg_clustersumoff;/* (u_int32) counts of avail clusters */

                        __fs32  cg_clusteroff;  /* (u_int8) free cluster map */

                        __fs32  cg_nclusterblks;/* number of clusters this cg */

                        __fs32   cg_niblk; /* number of inode blocks this cg */

                        __fs32   cg_initediblk; /* last initialized inode */

                        __fs32   cg_sparecon32[3];/* reserved for future use */

                        __fs64   cg_time;       /* time last written */

                        __fs64  cg_sparecon[3]; /* reserved for future use */

                } cg_u2;

                __fs32  cg_sparecon[16];        /* reserved for future use */

        } cg_u;

        __u8    cg_space[1];            /* space for cylinder group maps */

/* actually longer */

};

/* Historic Cylinder group info */

struct ufs_old_cylinder_group {

        __fs32  cg_link;                /* linked list of cyl groups */

        __fs32  cg_rlink;               /* for incore cyl groups     */

        __fs32  cg_time;                /* time last written */

        __fs32  cg_cgx;                 /* we are the cgx'th cylinder group */

        __fs16  cg_ncyl;                /* number of cyl's this cg */

        __fs16  cg_niblk;               /* number of inode blocks this cg */

        __fs32  cg_ndblk;               /* number of data blocks this cg */

        struct  ufs_csum cg_cs;         /* cylinder summary information */

        __fs32  cg_rotor;               /* position of last used block */

        __fs32  cg_frotor;              /* position of last used frag */

        __fs32  cg_irotor;              /* position of last used inode */

        __fs32  cg_frsum[8];            /* counts of available frags */

        __fs32  cg_btot[32];            /* block totals per cylinder */

        __fs16  cg_b[32][8];            /* positions of free blocks */

        __u8    cg_iused[256];          /* used inode map */

        __fs32  cg_magic;               /* magic number */

        __u8    cg_free[1];             /* free block map */

/* actually longer */

};

/*

 * structure of an on-disk inode

 */

struct ufs_inode {

        __fs16  ui_mode;                /*  0x0 */

        __fs16  ui_nlink;               /*  0x2 */

        union {

                struct {

                        __fs16  ui_suid;        /*  0x4 */

                        __fs16  ui_sgid;        /*  0x6 */

                } oldids;

                __fs32  ui_inumber;             /*  0x4 lsf: inode number */

                __fs32  ui_author;              /*  0x4 GNU HURD: author */

        } ui_u1;

        __fs64  ui_size;                /*  0x8 */

        struct ufs_timeval ui_atime;    /* 0x10 access */

        struct ufs_timeval ui_mtime;    /* 0x18 modification */

        struct ufs_timeval ui_ctime;    /* 0x20 creation */

        union {

                struct {

                        __fs32  ui_db[UFS_NDADDR];/* 0x28 data blocks */

                        __fs32  ui_ib[UFS_NINDIR];/* 0x58 indirect blocks */

                } ui_addr;

                __u8    ui_symlink[4*(UFS_NDADDR+UFS_NINDIR)];/* 0x28 fast symlink */

        } ui_u2;

        __fs32  ui_flags;               /* 0x64 immutable, append-only... */

        __fs32  ui_blocks;              /* 0x68 blocks in use */

        __fs32  ui_gen;                 /* 0x6c like ext2 i_version, for NFS support */

        union {

                struct {

                        __fs32  ui_shadow;      /* 0x70 shadow inode with security data */

                        __fs32  ui_uid;         /* 0x74 long EFT version of uid */

                        __fs32  ui_gid;         /* 0x78 long EFT version of gid */

                        __fs32  ui_oeftflag;    /* 0x7c reserved */

                } ui_sun;

                struct {

                        __fs32  ui_uid;         /* 0x70 File owner */

                        __fs32  ui_gid;         /* 0x74 File group */

                        __fs32  ui_spare[2];    /* 0x78 reserved */

                } ui_44;

                struct {

                        __fs32  ui_uid;         /* 0x70 */

                        __fs32  ui_gid;         /* 0x74 */

                        __fs16  ui_modeh;       /* 0x78 mode high bits */

                        __fs16  ui_spare;       /* 0x7A unused */

                        __fs32  ui_trans;       /* 0x7c filesystem translator */

                } ui_hurd;

        } ui_u3;

};

#define UFS_NXADDR  2            /* External addresses in inode. */

struct ufs2_inode {

        __fs16     ui_mode;        /*   0: IFMT, permissions; see below. */

        __fs16     ui_nlink;       /*   2: File link count. */

        __fs32     ui_uid;         /*   4: File owner. */

        __fs32     ui_gid;         /*   8: File group. */

        __fs32     ui_blksize;     /*  12: Inode blocksize. */

        __fs64     ui_size;        /*  16: File byte count. */

        __fs64     ui_blocks;      /*  24: Bytes actually held. */

        __fs64   ui_atime;       /*  32: Last access time. */

        __fs64   ui_mtime;       /*  40: Last modified time. */

        __fs64   ui_ctime;       /*  48: Last inode change time. */

        __fs64   ui_birthtime;   /*  56: Inode creation time. */

        __fs32     ui_mtimensec;   /*  64: Last modified time. */

        __fs32     ui_atimensec;   /*  68: Last access time. */

        __fs32     ui_ctimensec;   /*  72: Last inode change time. */

        __fs32     ui_birthnsec;   /*  76: Inode creation time. */

        __fs32     ui_gen;         /*  80: Generation number. */

        __fs32     ui_kernflags;   /*  84: Kernel flags. */

        __fs32     ui_flags;       /*  88: Status flags (chflags). */

        __fs32     ui_extsize;     /*  92: External attributes block. */

        __fs64     ui_extb[UFS_NXADDR];/*  96: External attributes block. */

        union {

                struct {

                        __fs64     ui_db[UFS_NDADDR]; /* 112: Direct disk blocks. */

                        __fs64     ui_ib[UFS_NINDIR];/* 208: Indirect disk blocks.*/

                } ui_addr;

        __u8    ui_symlink[2*4*(UFS_NDADDR+UFS_NINDIR)];/* 0x28 fast symlink */

        } ui_u2;

        __fs64     ui_spare[3];    /* 232: Reserved; currently unused */

};

/* FreeBSD has these in sys/stat.h */

/* ui_flags that can be set by a file owner */

#define UFS_UF_SETTABLE   0x0000ffff

#define UFS_UF_NODUMP     0x00000001  /* do not dump */

#define UFS_UF_IMMUTABLE  0x00000002  /* immutable (can't "change") */

#define UFS_UF_APPEND     0x00000004  /* append-only */

#define UFS_UF_OPAQUE     0x00000008  /* directory is opaque (unionfs) */

#define UFS_UF_NOUNLINK   0x00000010  /* can't be removed or renamed */

/* ui_flags that only root can set */

#define UFS_SF_SETTABLE   0xffff0000

#define UFS_SF_ARCHIVED   0x00010000  /* archived */

#define UFS_SF_IMMUTABLE  0x00020000  /* immutable (can't "change") */

#define UFS_SF_APPEND     0x00040000  /* append-only */

#define UFS_SF_NOUNLINK   0x00100000  /* can't be removed or renamed */

/*

 * This structure is used for reading disk structures larger

 * than the size of fragment.

 */

struct ufs_buffer_head {

        __u64 fragment;                 /* first fragment */

        __u64 count;                            /* number of fragments */

        struct buffer_head * bh[UFS_MAXFRAG];   /* buffers */

};

struct ufs_cg_private_info {

        struct ufs_buffer_head c_ubh;

        __u32   c_cgx;          /* number of cylidner group */

        __u16   c_ncyl;         /* number of cyl's this cg */

        __u16   c_niblk;        /* number of inode blocks this cg */

        __u32   c_ndblk;        /* number of data blocks this cg */

        __u32   c_rotor;        /* position of last used block */

        __u32   c_frotor;       /* position of last used frag */

        __u32   c_irotor;       /* position of last used inode */

        __u32   c_btotoff;      /* (__u32) block totals per cylinder */

        __u32   c_boff;         /* (short) free block positions */

        __u32   c_iusedoff;     /* (char) used inode map */

        __u32   c_freeoff;      /* (u_char) free block map */

        __u32   c_nextfreeoff;  /* (u_char) next available space */

        __u32   c_clustersumoff;/* (u_int32) counts of avail clusters */

        __u32   c_clusteroff;   /* (u_int8) free cluster map */

        __u32   c_nclusterblks; /* number of clusters this cg */

};

struct ufs_sb_private_info {

        struct ufs_buffer_head s_ubh; /* buffer containing super block */

        struct ufs_csum_core cs_total;

        __u32   s_sblkno;       /* offset of super-blocks in filesys */

        __u32   s_cblkno;       /* offset of cg-block in filesys */

        __u32   s_iblkno;       /* offset of inode-blocks in filesys */

        __u32   s_dblkno;       /* offset of first data after cg */

        __u32   s_cgoffset;     /* cylinder group offset in cylinder */

        __u32   s_cgmask;       /* used to calc mod fs_ntrak */

        __u32   s_size;         /* number of blocks (fragments) in fs */

        __u32   s_dsize;        /* number of data blocks in fs */

        __u64   s_u2_size;      /* ufs2: number of blocks (fragments) in fs */

        __u64   s_u2_dsize;     /*ufs2:  number of data blocks in fs */

        __u32   s_ncg;          /* number of cylinder groups */

        __u32   s_bsize;        /* size of basic blocks */

        __u32   s_fsize;        /* size of fragments */

        __u32   s_fpb;          /* fragments per block */

        __u32   s_minfree;      /* minimum percentage of free blocks */

        __u32   s_bmask;        /* `blkoff'' calc of blk offsets */

        __u32   s_fmask;        /* s_fsize mask */

        __u32   s_bshift;       /* `lblkno'' calc of logical blkno */

        __u32   s_fshift;       /* s_fsize shift */

        __u32   s_fpbshift;     /* fragments per block shift */

        __u32   s_fsbtodb;      /* fsbtodb and dbtofsb shift constant */

        __u32   s_sbsize;       /* actual size of super block */

        __u32   s_csmask;       /* csum block offset */

        __u32   s_csshift;      /* csum block number */

        __u32   s_nindir;       /* value of NINDIR */

        __u32   s_inopb;        /* value of INOPB */

        __u32   s_nspf;         /* value of NSPF */

        __u32   s_npsect;       /* # sectors/track including spares */

        __u32   s_interleave;   /* hardware sector interleave */

        __u32   s_trackskew;    /* sector 0 skew, per track */

        __u64   s_csaddr;       /* blk addr of cyl grp summary area */

        __u32   s_cssize;       /* size of cyl grp summary area */

        __u32   s_cgsize;       /* cylinder group size */

        __u32   s_ntrak;        /* tracks per cylinder */

        __u32   s_nsect;        /* sectors per track */

        __u32   s_spc;          /* sectors per cylinder */

        __u32   s_ipg;          /* inodes per cylinder group */

        __u32   s_fpg;          /* fragments per group */

        __u32   s_cpc;          /* cyl per cycle in postbl */

        __s32   s_contigsumsize;/* size of cluster summary array, 44bsd */

        __s64   s_qbmask;       /* ~usb_bmask */

        __s64   s_qfmask;       /* ~usb_fmask */

        __s32   s_postblformat; /* format of positional layout tables */

        __s32   s_nrpos;        /* number of rotational positions */

        __s32   s_postbloff;    /* (__s16) rotation block list head */