"""
typedef uint8 u_int8_t;
typedef uint16 u_int16_t;
typedef uint32 u_int32_t;
typedef uint64 u_int64_t;
typedef uchar u_char;
typedef uint32 u_int;
/*
* The size of physical and logical block numbers and time fields in UFS.
*/
typedef int32_t ufs1_daddr_t;
typedef int64_t ufs2_daddr_t;
typedef int64_t ufs_lbn_t;
typedef int64_t ufs_time_t;
/*
* The root inode is the root of the filesystem. Inode 0 can't be used for
* normal purposes and historically bad blocks were linked to inode 1, thus
* the root inode is 2. (Inode 1 is no longer used for this purpose, however
* numerous dump tapes make this assumption, so we are stuck with it).
*/
#define UFS_ROOTINO 2
/*
* 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
/*
* Max number of fragments per block. This value is NOT tweakable.
*/
#define MAXFRAG 8
/*
* 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 filesystem 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 filesystem 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 SBLOCKSIZE,
* and that both SBLOCKSIZE and MAXBSIZE must be >= MINBSIZE.
*/
#define MINBSIZE 4096
#define MAXBSIZE 65536
/*
* The path name on which the filesystem 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.
*/
#define MAXVOLLEN 32
/*
* 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
/*
* The maximum number of snapshot nodes that can be associated
* with each filesystem. This limit affects only the number of
* snapshot files that can be recorded within the superblock so
* that they can be found when the filesystem is mounted. However,
* maintaining too many will slow the filesystem performance, so
* having this limit is a good idea.
*/
#define FSMAXSNAP 20
/*
* 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 */
};
struct csum_total {
int64_t cs_ndir; /* number of directories */
int64_t cs_nbfree; /* number of free blocks */
int64_t cs_nifree; /* number of free inodes */
int64_t cs_nffree; /* number of free frags */
int64_t cs_numclusters; /* number of free clusters */
int64_t cs_spare[3]; /* future expansion */
};
/*
* Pointers to super block summary information. Placed in a separate
* structure so there is just one pointer in the superblock.
*
* The pointers in this structure are used as follows:
* fs_contigdirs references an array that tracks the creation of new
* directories
* fs_csp references a contiguous array of struct csum for
* all cylinder groups
* fs_maxcluster references an array of cluster sizes that is computed
* as cylinder groups are inspected
* fs_active is used when creating snapshots; it points to a bitmap
* of cylinder groups for which the free-block bitmap has changed
* since the snapshot operation began.
*/
struct fs_summary_info {
uint8_t *si_contigdirs; /* (u) # of contig. allocated dirs */
struct csum *si_csp; /* (u) cg summary info buffer */
int32_t *si_maxcluster; /* (u) max cluster in each cyl group */
u_int *si_active; /* (u) used by snapshots to track fs */
};
/*
* Super block for an FFS filesystem.
*/
struct fs {
int32_t fs_firstfield; /* historic filesystem linked list, */
int32_t fs_unused_1; /* used for incore super blocks */
int32_t fs_sblkno; /* offset of super-block in filesys */
int32_t fs_cblkno; /* offset of cyl-block in filesys */
int32_t fs_iblkno; /* offset of inode-blocks in filesys */
int32_t fs_dblkno; /* offset of first data after cg */
int32_t fs_old_cgoffset; /* cylinder group offset in cylinder */
int32_t fs_old_cgmask; /* used to calc mod fs_ntrak */
int32_t fs_old_time; /* last time written */
int32_t fs_old_size; /* number of blocks in fs */
int32_t fs_old_dsize; /* number of data blocks in fs */
u_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_old_rotdelay; /* num of ms for optimal next block */
int32_t fs_old_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_spare1[2]; /* old fs_csmask */
/* old fs_csshift */
int32_t fs_nindir; /* value of NINDIR */
u_int32_t fs_inopb; /* value of INOPB */
int32_t fs_old_nspf; /* value of NSPF */
/* yet another configuration parameter */
int32_t fs_optim; /* optimization preference, see below */
int32_t fs_old_npsect; /* # sectors/track including spares */
int32_t fs_old_interleave; /* hardware sector interleave */
int32_t fs_old_trackskew; /* sector 0 skew, per track */
int32_t fs_id[2]; /* unique filesystem id */
/* sizes determined by number of cylinder groups and their sizes */
int32_t fs_old_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 */
int32_t fs_spare2; /* old fs_ntrak */
int32_t fs_old_nsect; /* sectors per track */
int32_t fs_old_spc; /* sectors per cylinder */
int32_t fs_old_ncyl; /* cylinders in filesystem */
int32_t fs_old_cpg; /* cylinders per group */
u_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_old_cstotal; /* cylinder summary information */
/* these fields are cleared at mount time */
int8_t fs_fmod; /* super block modified flag */
int8_t fs_clean; /* filesystem is clean flag */
int8_t fs_ronly; /* mounted read-only flag */
int8_t fs_old_flags; /* old FS_ flags */
u_char fs_fsmnt[MAXMNTLEN]; /* name mounted on */
u_char fs_volname[MAXVOLLEN]; /* volume name */
u_int64_t fs_swuid; /* system-wide uid */
int32_t fs_pad; /* due to alignment of fs_swuid */
/* these fields retain the current block allocation info */
int32_t fs_cgrotor; /* last cg searched */
uint8 fs_ocsp[120]; /* padding; was list of fs_cs buffers */
struct fs_summary_info *fs_si; /* In-core pointer to summary info */
int32_t fs_old_cpc; /* cyl per cycle in postbl */
int32_t fs_maxbsize; /* maximum blocking factor permitted */
int64_t fs_unrefs; /* number of unreferenced inodes */
int64_t fs_providersize; /* size of underlying GEOM provider */
int64_t fs_metaspace; /* size of area reserved for metadata */
int64_t fs_sparecon64[13]; /* old rotation block list head */
int64_t fs_sblockactualloc; /* byte offset of this superblock */
int64_t fs_sblockloc; /* byte offset of standard superblock */
struct csum_total fs_cstotal; /* (u) cylinder summary information */
ufs_time_t fs_time; /* last time written */
int64_t fs_size; /* number of blocks in fs */
int64_t fs_dsize; /* number of data blocks in fs */
ufs2_daddr_t fs_csaddr; /* blk addr of cyl grp summary area */
int64_t fs_pendingblocks; /* (u) blocks being freed */
u_int32_t fs_pendinginodes; /* (u) inodes being freed */
uint32_t fs_snapinum[FSMAXSNAP]; /* list of snapshot inode numbers */
u_int32_t fs_avgfilesize; /* expected average file size */
u_int32_t fs_avgfpdir; /* expected # of files per directory */
int32_t fs_save_cgsize; /* save real cg size to use fs_bsize */
ufs_time_t fs_mtime; /* Last mount or fsck time. */
int32_t fs_sujfree; /* SUJ free list */
int32_t fs_sparecon32[21]; /* reserved for future constants */
u_int32_t fs_ckhash; /* if CK_SUPERBLOCK, its check-hash */
u_int32_t fs_metackhash; /* metadata check-hash, see CK_ below */
int32_t fs_flags; /* see FS_ flags below */
int32_t fs_contigsumsize; /* size of cluster summary array */
int32_t fs_maxsymlinklen; /* max length of an internal symlink */
int32_t fs_old_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_old_postblformat; /* format of positional layout tables */
int32_t fs_old_nrpos; /* number of rotational positions */
int32_t fs_spare5[2]; /* old fs_postbloff */
/* old fs_rotbloff */
int32_t fs_magic; /* magic number */
};
/*
* Filesystem identification
*/
#define FS_UFS1_MAGIC 0x011954 /* UFS1 fast filesystem magic number */
#define FS_UFS2_MAGIC 0x19540119 /* UFS2 fast filesystem magic number */
#define FS_BAD_MAGIC 0x19960408 /* UFS incomplete newfs magic number */
#define FS_42INODEFMT -1 /* 4.2BSD inode format */
#define FS_44INODEFMT 2 /* 4.4BSD inode format */
/*
* Filesystem flags.
*
* The FS_UNCLEAN flag is set by the kernel when the filesystem was
* mounted with fs_clean set to zero. The FS_DOSOFTDEP flag indicates
* that the filesystem should be managed by the soft updates code.
* Note that the FS_NEEDSFSCK flag is set and cleared by the fsck
* utility. It is set when background fsck finds an unexpected
* inconsistency which requires a traditional foreground fsck to be
* run. Such inconsistencies should only be found after an uncorrectable
* disk error. The FS_NEEDSFSCK can also be set when a mounted filesystem
* discovers an internal inconsistency such as freeing a freed inode.
* A foreground fsck will clear the FS_NEEDSFSCK flag when it has
* successfully cleaned up the filesystem. The kernel uses this
* flag to enforce that inconsistent filesystems be mounted read-only.
*
* The FS_METACKHASH flag when set indicates that the kernel maintains
* one or more check hashes. The actual set of supported check hashes
* is stored in the fs_metackhash field. Kernels that do not support
* check hashes clear the FS_METACKHASH flag to indicate that the
* check hashes need to be rebuilt (by fsck) before they can be used.
*
* When a filesystem is mounted, any flags not included in FS_SUPPORTED
* are cleared. This lets newer features know that the filesystem has
* been run on an older version of the filesystem and thus that data
* structures associated with those features are out-of-date and need
* to be rebuilt.
*
* FS_ACLS indicates that POSIX.1e ACLs are administratively enabled
* for the file system, so they should be loaded from extended attributes,
* observed for access control purposes, and be administered by object
* owners. FS_NFS4ACLS indicates that NFSv4 ACLs are administratively
* enabled. This flag is mutually exclusive with FS_ACLS. FS_MULTILABEL
* indicates that the TrustedBSD MAC Framework should attempt to back MAC
* labels into extended attributes on the file system rather than maintain
* a single mount label for all objects.
*/
#define FS_UNCLEAN 0x00000001 /* filesystem not clean at mount */
#define FS_DOSOFTDEP 0x00000002 /* filesystem using soft dependencies */
#define FS_NEEDSFSCK 0x00000004 /* filesystem needs sync fsck before mount */
#define FS_SUJ 0x00000008 /* Filesystem using softupdate journal */
#define FS_ACLS 0x00000010 /* file system has POSIX.1e ACLs enabled */
#define FS_MULTILABEL 0x00000020 /* file system is MAC multi-label */
#define FS_GJOURNAL 0x00000040 /* gjournaled file system */
#define FS_FLAGS_UPDATED 0x0000080 /* flags have been moved to new location */
#define FS_NFS4ACLS 0x00000100 /* file system has NFSv4 ACLs enabled */
#define FS_METACKHASH 0x00000200 /* kernel supports metadata check hashes */
#define FS_TRIM 0x00000400 /* issue BIO_DELETE for deleted blocks */
#define FS_SUPPORTED 0x00FFFFFF /* supported flags, others cleared at mount*/
/*
* Cylinder group block for a filesystem.
*/
#define CG_MAGIC 0x090255
struct cg {
int32_t cg_firstfield; /* historic cyl groups linked list */
int32_t cg_magic; /* magic number */
int32_t cg_old_time; /* time last written */
u_int32_t cg_cgx; /* we are the cgx'th cylinder group */
int16_t cg_old_ncyl; /* number of cyl's this cg */
int16_t cg_old_niblk; /* number of inode blocks this cg */
u_int32_t cg_ndblk; /* number of data blocks this cg */
struct csum cg_cs; /* cylinder summary information */
u_int32_t cg_rotor; /* position of last used block */
u_int32_t cg_frotor; /* position of last used frag */
u_int32_t cg_irotor; /* position of last used inode */
u_int32_t cg_frsum[MAXFRAG]; /* counts of available frags */
int32_t cg_old_btotoff; /* (int32) block totals per cylinder */
int32_t cg_old_boff; /* (u_int16) free block positions */
u_int32_t cg_iusedoff; /* (u_int8) used inode map */
u_int32_t cg_freeoff; /* (u_int8) free block map */
u_int32_t cg_nextfreeoff; /* (u_int8) next available space */
u_int32_t cg_clustersumoff; /* (u_int32) counts of avail clusters */
u_int32_t cg_clusteroff; /* (u_int8) free cluster map */
u_int32_t cg_nclusterblks; /* number of clusters this cg */
u_int32_t cg_niblk; /* number of inode blocks this cg */
u_int32_t cg_initediblk; /* last initialized inode */
u_int32_t cg_unrefs; /* number of unreferenced inodes */
int32_t cg_sparecon32[1]; /* reserved for future use */
u_int32_t cg_ckhash; /* check-hash of this cg */
ufs_time_t cg_time; /* time last written */
int64_t cg_sparecon64[3]; /* reserved for future use */
u_int8_t cg_space[1]; /* space for cylinder group maps */
/* actually longer */
};
/*
* A dinode contains all the meta-data associated with a UFS2 file.
* This structure defines the on-disk format of a dinode. Since
* this structure describes an on-disk structure, all its fields
* are defined by types with precise widths.
*/
#define UFS_NXADDR 2 /* External addresses in inode. */
#define UFS_NDADDR 12 /* Direct addresses in inode. */
#define UFS_NIADDR 3 /* Indirect addresses in inode. */
struct ufs2_dinode {
u_int16_t di_mode; /* 0: IFMT, permissions; see below. */
int16_t di_nlink; /* 2: File link count. */
u_int32_t di_uid; /* 4: File owner. */
u_int32_t di_gid; /* 8: File group. */
u_int32_t di_blksize; /* 12: Inode blocksize. */
u_int64_t di_size; /* 16: File byte count. */
u_int64_t di_blocks; /* 24: Blocks actually held. */
ufs_time_t di_atime; /* 32: Last access time. */
ufs_time_t di_mtime; /* 40: Last modified time. */
ufs_time_t di_ctime; /* 48: Last inode change time. */
ufs_time_t di_birthtime; /* 56: Inode creation time. */
int32_t di_mtimensec; /* 64: Last modified time. */
int32_t di_atimensec; /* 68: Last access time. */
int32_t di_ctimensec; /* 72: Last inode change time. */
int32_t di_birthnsec; /* 76: Inode creation time. */
u_int32_t di_gen; /* 80: Generation number. */
u_int32_t di_kernflags; /* 84: Kernel flags. */
u_int32_t di_flags; /* 88: Status flags (chflags). */
u_int32_t di_extsize; /* 92: External attributes size. */
ufs2_daddr_t di_extb[UFS_NXADDR]; /* 96: External attributes block. */
ufs2_daddr_t di_db[UFS_NDADDR]; /* 112: Direct disk blocks. */
ufs2_daddr_t di_ib[UFS_NIADDR]; /* 208: Indirect disk blocks. */
u_int64_t di_modrev; /* 232: i_modrev for NFSv4 */
uint32_t di_freelink; /* 240: SUJ: Next unlinked inode. */
uint32_t di_ckhash; /* 244: if CK_INODE, its check-hash */
uint32_t di_spare[2]; /* 248: Reserved; currently unused */
};
/*
* A UFS1 dinode contains all the meta-data associated with a UFS1 file.
* This structure defines the on-disk format of a UFS1 dinode. Since
* this structure describes an on-disk structure, all its fields
* are defined by types with precise widths.
*/
struct ufs1_dinode {
u_int16_t di_mode; /* 0: IFMT, permissions; see below. */
int16_t di_nlink; /* 2: File link count. */
uint32_t di_freelink; /* 4: SUJ: Next unlinked inode. */
u_int64_t di_size; /* 8: File byte count. */
int32_t di_atime; /* 16: Last access time. */
int32_t di_atimensec; /* 20: Last access time. */
int32_t di_mtime; /* 24: Last modified time. */
int32_t di_mtimensec; /* 28: Last modified time. */
int32_t di_ctime; /* 32: Last inode change time. */
int32_t di_ctimensec; /* 36: Last inode change time. */
ufs1_daddr_t di_db[UFS_NDADDR]; /* 40: Direct disk blocks. */
ufs1_daddr_t di_ib[UFS_NIADDR]; /* 88: Indirect disk blocks. */
u_int32_t di_flags; /* 100: Status flags (chflags). */
u_int32_t di_blocks; /* 104: Blocks actually held. */
u_int32_t di_gen; /* 108: Generation number. */
u_int32_t di_uid; /* 112: File owner. */
u_int32_t di_gid; /* 116: File group. */
u_int64_t di_modrev; /* 120: i_modrev for NFSv4 */
};
#define UFS_LINK_MAX 32767
#define UFS_MAXNAMLEN 255
struct direct {
u_int32_t d_ino; /* inode number of entry */
u_int16_t d_reclen; /* length of this record */
u_int8_t d_type; /* file type, see below */
u_int8_t d_namlen; /* length of string in d_name */
char d_name[0]; /* name with length <= UFS_MAXNAMLEN */
};
"""