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reactos/drivers/filesystems/fs_rec/ffs.h

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/*
* COPYRIGHT: See COPYING in the top level directory
* PROJECT: ReactOS File System Recognizer
* FILE: drivers/filesystems/fs_rec/ffs.h
* PURPOSE: FFS Header File
* PROGRAMMER: Peter Hater
* Pierre Schweitzer (pierre@reactos.org)
*/
#include <pshpack1.h>
/*
* 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 468
/*
* The volume name for this filesystem is maintained in fs_volname.
* MAXVOLLEN defines the length of the buffer allocated.
* This space used to be part of of fs_fsmnt.
*/
#define MAXVOLLEN 32
/*
* Unused value currently, FreeBSD compat.
*/
#define FSMAXSNAP 20
/*
* 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 four
* 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;
* the third (fs_contigdirs) points to an array that tracks the
* creation of new directories; and the fourth (fs_active) is used
* by snapshots.
*/
#define NOCSPTRS ((128 / sizeof(void *)) - 4)
/*
* 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 cs_ndir; /* number of directories */
INT32 cs_nbfree; /* number of free blocks */
INT32 cs_nifree; /* number of free inodes */
INT32 cs_nffree; /* number of free frags */
};
struct csum_total {
INT64 cs_ndir; /* number of directories */
INT64 cs_nbfree; /* number of free blocks */
INT64 cs_nifree; /* number of free inodes */
INT64 cs_nffree; /* number of free frags */
INT64 cs_spare[4]; /* future expansion */
};
/*
* Super block for an FFS file system in memory.
*/
typedef struct fs {
INT32 fs_firstfield; /* historic file system linked list, */
INT32 fs_unused_1; /* used for incore super blocks */
INT32 fs_sblkno; /* addr of super-block in filesys */
INT32 fs_cblkno; /* offset of cyl-block in filesys */
INT32 fs_iblkno; /* offset of inode-blocks in filesys */
INT32 fs_dblkno; /* offset of first data after cg */
INT32 fs_old_cgoffset; /* cylinder group offset in cylinder */
INT32 fs_old_cgmask; /* used to calc mod fs_ntrak */
INT32 fs_old_time; /* last time written */
INT32 fs_old_size; /* number of blocks in fs */
INT32 fs_old_dsize; /* number of data blocks in fs */
INT32 fs_ncg; /* number of cylinder groups */
INT32 fs_bsize; /* size of basic blocks in fs */
INT32 fs_fsize; /* size of frag blocks in fs */
INT32 fs_frag; /* number of frags in a block in fs */
/* these are configuration parameters */
INT32 fs_minfree; /* minimum percentage of free blocks */
INT32 fs_old_rotdelay; /* num of ms for optimal next block */
INT32 fs_old_rps; /* disk revolutions per second */
/* these fields can be computed from the others */
INT32 fs_bmask; /* ``blkoff'' calc of blk offsets */
INT32 fs_fmask; /* ``fragoff'' calc of frag offsets */
INT32 fs_bshift; /* ``lblkno'' calc of logical blkno */
INT32 fs_fshift; /* ``numfrags'' calc number of frags */
/* these are configuration parameters */
INT32 fs_maxcontig; /* max number of contiguous blks */
INT32 fs_maxbpg; /* max number of blks per cyl group */
/* these fields can be computed from the others */
INT32 fs_fragshift; /* block to frag shift */
INT32 fs_fsbtodb; /* fsbtodb and dbtofsb shift constant */
INT32 fs_sbsize; /* actual size of super block */
INT32 fs_spare1[2]; /* old fs_csmask */
/* old fs_csshift */
INT32 fs_nindir; /* value of NINDIR */
INT32 fs_inopb; /* value of INOPB */
INT32 fs_old_nspf; /* value of NSPF */
/* yet another configuration parameter */
INT32 fs_optim; /* optimization preference, see below */
/* these fields are derived from the hardware */
INT32 fs_old_npsect; /* # sectors/track including spares */
INT32 fs_old_interleave; /* hardware sector interleave */
INT32 fs_old_trackskew; /* sector 0 skew, per track */
/* fs_id takes the space of the unused fs_headswitch and fs_trkseek fields */
INT32 fs_id[2]; /* unique file system id */
/* sizes determined by number of cylinder groups and their sizes */
INT32 fs_old_csaddr; /* blk addr of cyl grp summary area */
INT32 fs_cssize; /* size of cyl grp summary area */
INT32 fs_cgsize; /* cylinder group size */
/* these fields are derived from the hardware */
INT32 fs_spare2; /* old fs_ntrak */
INT32 fs_old_nsect; /* sectors per track */
INT32 fs_old_spc; /* sectors per cylinder */
INT32 fs_old_ncyl; /* cylinders in file system */
INT32 fs_old_cpg; /* cylinders per group */
INT32 fs_ipg; /* inodes per group */
INT32 fs_fpg; /* blocks per group * fs_frag */
/* this data must be re-computed after crashes */
struct csum fs_old_cstotal; /* cylinder summary information */
/* these fields are cleared at mount time */
INT8 fs_fmod; /* super block modified flag */
INT8 fs_clean; /* file system is clean flag */
INT8 fs_ronly; /* mounted read-only flag */
UINT8 fs_old_flags; /* see FS_ flags below */
UCHAR fs_fsmnt[MAXMNTLEN]; /* name mounted on */
UCHAR fs_volname[MAXVOLLEN]; /* volume name */
UINT64 fs_swuid; /* system-wide uid */
INT32 fs_pad;
/* these fields retain the current block allocation info */
INT32 fs_cgrotor; /* last cg searched (UNUSED) */
void *fs_ocsp[NOCSPTRS]; /* padding; was list of fs_cs buffers */
UINT8 *fs_contigdirs; /* # of contiguously allocated dirs */
struct csum *fs_csp; /* cg summary info buffer for fs_cs */
INT32 *fs_maxcluster; /* max cluster in each cyl group */
INT32 *fs_active; /* used by snapshots to track fs */
INT32 fs_old_cpc; /* cyl per cycle in postbl */
/* this area is otherwise allocated unless fs_old_flags & FS_FLAGS_UPDATED */
INT32 fs_maxbsize; /* maximum blocking factor permitted */
INT64 fs_sparecon64[17]; /* old rotation block list head */
INT64 fs_sblockloc; /* byte offset of standard superblock */
struct csum_total fs_cstotal; /* cylinder summary information */
INT64 fs_time; /* last time written */
INT64 fs_size; /* number of blocks in fs */
INT64 fs_dsize; /* number of data blocks in fs */
INT64 fs_csaddr; /* blk addr of cyl grp summary area */
INT64 fs_pendingblocks; /* blocks in process of being freed */
INT32 fs_pendinginodes; /* inodes in process of being freed */
INT32 fs_snapinum[FSMAXSNAP];/* list of snapshot inode numbers */
/* back to stuff that has been around a while */
INT32 fs_avgfilesize; /* expected average file size */
INT32 fs_avgfpdir; /* expected # of files per directory */
INT32 fs_save_cgsize; /* save real cg size to use fs_bsize */
INT32 fs_sparecon32[26]; /* reserved for future constants */
INT32 fs_flags; /* see FS_ flags below */
/* back to stuff that has been around a while (again) */
INT32 fs_contigsumsize; /* size of cluster summary array */
INT32 fs_maxsymlinklen; /* max length of an internal symlink */
INT32 fs_old_inodefmt; /* format of on-disk inodes */
UINT64 fs_maxfilesize; /* maximum representable file size */
INT64 fs_qbmask; /* ~fs_bmask for use with 64-bit size */
INT64 fs_qfmask; /* ~fs_fmask for use with 64-bit size */
INT32 fs_state; /* validate fs_clean field (UNUSED) */
INT32 fs_old_postblformat; /* format of positional layout tables */
INT32 fs_old_nrpos; /* number of rotational positions */
INT32 fs_spare5[2]; /* old fs_postbloff */
/* old fs_rotbloff */
INT32 fs_magic; /* magic number */
} FFSD_SUPER_BLOCK, *PFFSD_SUPER_BLOCK;
#define MAXPARTITIONS 16 /* number of partitions */
#define NDDATA 5
#define NSPARE 5
typedef struct disklabel {
UINT32 d_magic; /* the magic number */
UINT16 d_type; /* drive type */
UINT16 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;
/* disk geometry: */
UINT32 d_secsize; /* # of bytes per sector */
UINT32 d_nsectors; /* # of data sectors per track */
UINT32 d_ntracks; /* # of tracks per cylinder */
UINT32 d_ncylinders; /* # of data cylinders per unit */
UINT32 d_secpercyl; /* # of data sectors per cylinder */
UINT32 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.
*/
UINT16 d_sparespertrack; /* # of spare sectors per track */
UINT16 d_sparespercyl; /* # of spare sectors per cylinder */
/*
* Alternative cylinders include maintenance, replacement,
* configuration description areas, etc.
*/
UINT32 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.
*/
UINT16 d_rpm; /* rotational speed */
UINT16 d_interleave; /* hardware sector interleave */
UINT16 d_trackskew; /* sector 0 skew, per track */
UINT16 d_cylskew; /* sector 0 skew, per cylinder */
UINT32 d_headswitch; /* head switch time, usec */
UINT32 d_trkseek; /* track-to-track seek, usec */
UINT32 d_flags; /* generic flags */
UINT32 d_drivedata[NDDATA]; /* drive-type specific information */
UINT32 d_spare[NSPARE]; /* reserved for future use */
UINT32 d_magic2; /* the magic number (again) */
UINT16 d_checksum; /* xor of data incl. partitions */
/* filesystem and partition information: */
UINT16 d_npartitions; /* number of partitions in following */
UINT32 d_bbsize; /* size of boot area at sn0, bytes */
UINT32 d_sbsize; /* max size of fs superblock, bytes */
struct partition { /* the partition table */
UINT32 p_size; /* number of sectors in partition */
UINT32 p_offset; /* starting sector */
union {
UINT32 fsize; /* FFS, ADOS:
filesystem basic fragment size */
UINT32 cdsession; /* ISO9660: session offset */
} __partition_u2;
UINT8 p_fstype; /* filesystem type, see below */
UINT8 p_frag; /* filesystem fragments per block */
union {
UINT16 cpg; /* UFS: FS cylinders per group */
UINT16 sgs; /* LFS: FS segment shift */
} __partition_u1;
} d_partitions[MAXPARTITIONS]; /* actually may be more */
} FFSD_DISKLABEL, *PFFSD_DISKLABEL;
#include <poppack.h>
C_ASSERT(FIELD_OFFSET(FFSD_SUPER_BLOCK, fs_cgsize) == 160);
C_ASSERT(FIELD_OFFSET(FFSD_SUPER_BLOCK, fs_fmod) == 208);
C_ASSERT(FIELD_OFFSET(FFSD_SUPER_BLOCK, fs_ocsp) == 728);
#define SBLOCK_UFS1 8192
#define SBLOCK_UFS2 65536
#define SBLOCKSIZE 8192
/*
* File system identification
*/
#define FS_UFS1_MAGIC 0x011954 /* UFS1 fast file system magic number */
#define FS_UFS2_MAGIC 0x19540119 /* UFS2 fast file system magic number */
#define DISKMAGIC ((UINT32)0x82564557) /* The disk magic number */
#define LABELSECTOR 1 /* sector containing label */
#define FS_BSDFFS 7 /* 4.2BSD fast file system */
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