--- /dev/null
+/*-
+ * Copyright (c) 1982, 1986, 1993
+ * The Regents of the University of California. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 4. Neither the name of the University nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * @(#)fs.h 8.13 (Berkeley) 3/21/95
+ * $FreeBSD: src/sys/ufs/ffs/fs.h,v 1.43.2.3 2005/02/28 16:04:53 delphij Exp $
+ */
+
+#ifndef _UFS_FFS_FS_H_
+#define _UFS_FFS_FS_H_
+
+/*
+ * 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 }
+
+/*
+ * 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 SBSIZE,
+ * and that both SBSIZE and MAXBSIZE must be >= MINBSIZE.
+ */
+#define MINBSIZE 4096
+
+/*
+ * 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
+
+/*
+ * 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 a few
+ * 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,
+ * and the third points to an array that tracks the creation of new
+ * directories. A fourth pointer, 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.
+ */
+#define NOCSPTRS ((128 / sizeof(void *)) - 4)
+
+/*
+ * 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 filesystem
+ * 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 filesystem
+ * 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
+
+/*
+ * Grigoriy Orlov <gluk@ptci.ru> has done some extensive work to fine
+ * tune the layout preferences for directories within a filesystem.
+ * His algorithm can be tuned by adjusting the following parameters
+ * which tell the system the average file size and the average number
+ * of files per directory. These defaults are well selected for typical
+ * filesystems, but may need to be tuned for odd cases like filesystems
+ * being used for squid caches or news spools.
+ */
+#define AVFILESIZ 16384 /* expected average file size */
+#define AFPDIR 64 /* expected number of files per directory */
+
+/*
+ * 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
+
+/*
+ * Used to identify special blocks in snapshots:
+ *
+ * BLK_NOCOPY - A block that was unallocated at the time the snapshot
+ * was taken, hence does not need to be copied when written.
+ * BLK_SNAP - A block held by another snapshot that is not needed by this
+ * snapshot. When the other snapshot is freed, the BLK_SNAP entries
+ * are converted to BLK_NOCOPY. These are needed to allow fsck to
+ * identify blocks that are in use by other snapshots (which are
+ * expunged from this snapshot).
+ */
+#define BLK_NOCOPY ((ufs2_daddr_t)(1))
+#define BLK_SNAP ((ufs2_daddr_t)(2))
+
+/*
+ * Sysctl values for the fast filesystem.
+ */
+#define FFS_ADJ_REFCNT 1 /* adjust inode reference count */
+#define FFS_ADJ_BLKCNT 2 /* adjust inode used block count */
+#define FFS_BLK_FREE 3 /* free range of blocks in map */
+#define FFS_DIR_FREE 4 /* free specified dir inodes in map */
+#define FFS_FILE_FREE 5 /* free specified file inodes in map */
+#define FFS_SET_FLAGS 6 /* set filesystem flags */
+#define FFS_ADJ_NDIR 7 /* adjust number of directories */
+#define FFS_ADJ_NBFREE 8 /* adjust number of free blocks */
+#define FFS_ADJ_NIFREE 9 /* adjust number of free inodes */
+#define FFS_ADJ_NFFREE 10 /* adjust number of free frags */
+#define FFS_ADJ_NUMCLUSTERS 11 /* adjust number of free clusters */
+#define FFS_MAXID 12 /* number of valid ffs ids */
+
+/*
+ * Command structure passed in to the filesystem to adjust filesystem values.
+ */
+#define FFS_CMD_VERSION 0x19790518 /* version ID */
+struct fsck_cmd {
+ int32_t version; /* version of command structure */
+ int32_t handle; /* reference to filesystem to be changed */
+ int64_t value; /* inode or block number to be affected */
+ int64_t size; /* amount or range to be adjusted */
+ int64_t spare; /* reserved for future use */
+};
+
+/*
+ * 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 */
+};
+
+/*
+ * 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 */
+ 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 */
+ 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 */
+ 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 */
+ char fs_fsmnt[MAXMNTLEN]; /* name mounted on */
+ char fs_volname[MAXVOLLEN]; /* volume name */
+ uint64_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 */
+ void *fs_ocsp[NOCSPTRS]; /* padding; was list of fs_cs buffers */
+ uint8_t *fs_contigdirs; /* # of contiguously allocated dirs */
+ struct csum *fs_csp; /* cg summary info buffer for fs_cs */
+ int32_t *fs_maxcluster; /* max cluster in each cyl group */
+ unsigned int *fs_active; /* used by snapshots to track fs */
+ int32_t fs_old_cpc; /* cyl per cycle in postbl */
+ int32_t fs_maxbsize; /* maximum blocking factor permitted */
+ int64_t fs_sparecon64[17]; /* old rotation block list head */
+ int64_t fs_sblockloc; /* byte offset of standard superblock */
+ struct csum_total fs_cstotal; /* 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; /* blocks in process of being freed */
+ int32_t fs_pendinginodes; /* inodes in process of being freed */
+ int32_t fs_snapinum[FSMAXSNAP];/* list of snapshot inode numbers */
+ int32_t fs_avgfilesize; /* expected average file size */
+ int32_t fs_avgfpdir; /* expected # of files per directory */
+ int32_t fs_save_cgsize; /* save real cg size to use fs_bsize */
+ int32_t fs_sparecon32[26]; /* reserved for future constants */
+ 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 */
+ uint64_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 */
+};
+
+/* Sanity checking. */
+#ifdef CTASSERT
+CTASSERT(sizeof(struct fs) == 1376);
+#endif
+
+/*
+ * 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_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.
+ *
+ * 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 only 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. 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_INDEXDIRS flag when set indicates that the kernel maintains
+ * on-disk auxiliary indexes (such as B-trees) for speeding directory
+ * accesses. Kernels that do not support auxiliary indicies clear the
+ * flag to indicate that the indicies need to be rebuilt (by fsck) before
+ * they can be used.
+ *
+ * FS_ACLS indicates that 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_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 0x01 /* filesystem not clean at mount */
+#define FS_DOSOFTDEP 0x02 /* filesystem using soft dependencies */
+#define FS_NEEDSFSCK 0x04 /* filesystem needs sync fsck before mount */
+#define FS_INDEXDIRS 0x08 /* kernel supports indexed directories */
+#define FS_ACLS 0x10 /* file system has ACLs enabled */
+#define FS_MULTILABEL 0x20 /* file system is MAC multi-label */
+#define FS_FLAGS_UPDATED 0x80 /* flags have been moved to new location */
+
+/*
+ * Macros to access bits in the fs_active array.
+ */
+#define ACTIVECGNUM(fs, cg) ((fs)->fs_active[(cg) / (NBBY * sizeof(int))])
+#define ACTIVECGOFF(cg) (1 << ((cg) % (NBBY * sizeof(int))))
+
+/*
+ * 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) + \
+ /* old btotoff */ (fs)->fs_old_cpg * sizeof(int32_t) + \
+ /* old boff */ (fs)->fs_old_cpg * sizeof(uint16_t) + \
+ /* inode map */ howmany((fs)->fs_ipg, NBBY) + \
+ /* block map */ howmany((fs)->fs_fpg, NBBY) +\
+ /* if present */ ((fs)->fs_contigsumsize <= 0 ? 0 : \
+ /* cluster sum */ (fs)->fs_contigsumsize * sizeof(int32_t) + \
+ /* cluster map */ howmany(fragstoblks(fs, (fs)->fs_fpg), NBBY)))
+
+/*
+ * The minimal number of cylinder groups that should be created.
+ */
+#define MINCYLGRPS 4
+
+/*
+ * Convert cylinder group to base address of its global summary info.
+ */
+#define fs_cs(fs, indx) fs_csp[indx]
+
+/*
+ * 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 */
+ 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 */
+ 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_old_btotoff; /* (int32) block totals per cylinder */
+ int32_t cg_old_boff; /* (uint16) free block positions */
+ int32_t cg_iusedoff; /* (uint8) used inode map */
+ int32_t cg_freeoff; /* (uint8) free block map */
+ int32_t cg_nextfreeoff; /* (uint8) next available space */
+ int32_t cg_clustersumoff; /* (uint32) counts of avail clusters */
+ int32_t cg_clusteroff; /* (uint8) free cluster map */
+ int32_t cg_nclusterblks; /* number of clusters this cg */
+ int32_t cg_niblk; /* number of inode blocks this cg */
+ int32_t cg_initediblk; /* last initialized inode */
+ int32_t cg_sparecon32[3]; /* reserved for future use */
+ ufs_time_t cg_time; /* time last written */
+ int64_t cg_sparecon64[3]; /* reserved for future use */
+ uint8_t cg_space[1]; /* space for cylinder group maps */
+/* actually longer */
+};
+
+/*
+ * Macros for access to cylinder group array structures
+ */
+#define cg_chkmagic(cgp) ((cgp)->cg_magic == CG_MAGIC)
+#define cg_inosused(cgp) \
+ ((uint8_t *)((uint8_t *)(cgp) + (cgp)->cg_iusedoff))
+#define cg_blksfree(cgp) \
+ ((uint8_t *)((uint8_t *)(cgp) + (cgp)->cg_freeoff))
+#define cg_clustersfree(cgp) \
+ ((uint8_t *)((uint8_t *)(cgp) + (cgp)->cg_clusteroff))
+#define cg_clustersum(cgp) \
+ ((int32_t *)((uintptr_t)(cgp) + (cgp)->cg_clustersumoff))
+
+/*
+ * Turn filesystem block numbers into disk block addresses.
+ * This maps filesystem 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 filesystem addresses of cylinder group data structures.
+ */
+#define cgbase(fs, c) (((ufs2_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) \
+ ((fs)->fs_magic == FS_UFS2_MAGIC ? cgbase(fs, c) : \
+ (cgbase(fs, c) + (fs)->fs_old_cgoffset * ((c) & ~((fs)->fs_old_cgmask))))
+
+/*
+ * Macros for handling inode numbers:
+ * inode number to filesystem block offset.
+ * inode number to cylinder group number.
+ * inode number to filesystem block address.
+ */
+#define ino_to_cg(fs, x) ((x) / (fs)->fs_ipg)
+#define ino_to_fsba(fs, x) \
+ ((ufs2_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 filesystem block.
+ * Give cylinder group block number for a filesystem 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)))
+
+/*
+ * 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 lfragtosize(fs, frag) /* calculates ((off_t)frag * fs->fs_fsize) */ \
+ (((off_t)(frag)) << (fs)->fs_fshift)
+#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 filesystem.
+ */
+#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 sblksize(fs, size, lbn) \
+ (((lbn) >= NDADDR || (size) >= ((lbn) + 1) << (fs)->fs_bshift) \
+ ? (fs)->fs_bsize \
+ : (fragroundup(fs, blkoff(fs, (size)))))
+
+
+/*
+ * 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 filesystem block.
+ */
+#define NINDIR(fs) ((fs)->fs_nindir)
+
+extern int inside[], around[];
+extern char *fragtbl[];
+
+struct ufs_dirent {
+ uint32_t d_fileno; /* file number of entry */
+ uint16_t d_reclen; /* length of this record */
+ uint8_t d_type; /* file type, see below */
+ uint8_t d_namlen; /* length of string in d_name */
+#define MAXNAMLEN 255
+ char d_name[MAXNAMLEN + 1]; /* name must be no longer than this */
+};
+
+/*
+ * File types
+ */
+#define DT_UNKNOWN 0
+#define DT_FIFO 1
+#define DT_CHR 2
+#define DT_DIR 4
+#define DT_BLK 6
+#define DT_REG 8
+#define DT_LNK 10
+#define DT_SOCK 12
+#define DT_WHT 14
+
+/* XXX: We hardcode BSIZE and BSIZE_SHIFT here. fsys_ffs seems to do the same,
+ * so we should get away with it :-) */
+#define DEV_BSIZE 512
+#define DEV_BSHIFT 9 /* 2**9 = 512 */
+#define MAXBSIZE 8192
+
+typedef unsigned int ino_t;
+
+#endif
Code Review / kvmfornfv.git / blobdiff