mirror of
https://github.com/reactos/reactos.git
synced 2024-09-04 01:29:31 +00:00
698 lines
28 KiB
C
698 lines
28 KiB
C
![]() |
/* $NetBSD: fs.h,v 1.43 2004/03/21 18:48:24 dsl Exp $ */
|
||
|
|
||
|
/*
|
||
|
* 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.
|
||
|
* 3. 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
|
||
|
*/
|
||
|
|
||
|
#ifndef _UFS_FFS_FS_H_
|
||
|
#define _UFS_FFS_FS_H_
|
||
|
|
||
|
#include "type.h"
|
||
|
|
||
|
/*
|
||
|
* Each disk drive contains some number of file systems.
|
||
|
* A file system consists of a number of cylinder groups.
|
||
|
* Each cylinder group has inodes and data.
|
||
|
*
|
||
|
* A file system is described by its super-block, which in turn
|
||
|
* describes the cylinder groups. The super-block is critical
|
||
|
* data and is replicated in each cylinder group to protect against
|
||
|
* catastrophic loss. This is done at `newfs' time and the critical
|
||
|
* super-block data does not change, so the copies need not be
|
||
|
* referenced further unless disaster strikes.
|
||
|
*
|
||
|
* For file system fs, the offsets of the various blocks of interest
|
||
|
* are given in the super block as:
|
||
|
* [fs->fs_sblkno] Super-block
|
||
|
* [fs->fs_cblkno] Cylinder group block
|
||
|
* [fs->fs_iblkno] Inode blocks
|
||
|
* [fs->fs_dblkno] Data blocks
|
||
|
* The beginning of cylinder group cg in fs, is given by
|
||
|
* the ``cgbase(fs, cg)'' macro.
|
||
|
*
|
||
|
* 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.
|
||
|
*
|
||
|
* Unfortunately the UFS2/FFSv2 change was done without adequate consideration
|
||
|
* of backward compatibility. In particular 'newfs' for a FFSv2 partition
|
||
|
* must overwrite any old FFSv1 superblock at 8k, and preferrably as many
|
||
|
* of the alternates as it can find - otherwise attempting to mount on a
|
||
|
* system that only supports FFSv1 is likely to succeed!.
|
||
|
* For a small FFSv1 filesystem, an old FFSv2 superblock can be left on
|
||
|
* the disk, and a system that tries to find an FFSv2 filesystem in preference
|
||
|
* to and FFSv1 one (as NetBSD does) can mount the old FFSv2 filesystem.
|
||
|
* As a added bonus, the 'first alternate' superblock of a FFSv1 filesystem
|
||
|
* with 64k blocks is at 64k - just where the code looks first when playing
|
||
|
* 'hunt the superblock'.
|
||
|
*
|
||
|
* The ffsv2 superblock layout (which might contain an ffsv1 filesystem)
|
||
|
* can be detected by checking for sb->fs_old_flags & FS_FLAGS_UPDATED.
|
||
|
* This is the default suberblock type for NetBSD since ffsv2 support was added.
|
||
|
*/
|
||
|
#define BBSIZE 8192
|
||
|
#define BBOFF ((off_t)(0))
|
||
|
#define BBLOCK ((daddr_t)(0))
|
||
|
|
||
|
#define SBLOCK_FLOPPY 0
|
||
|
#define SBLOCK_UFS1 8192
|
||
|
#define SBLOCK_UFS2 65536
|
||
|
#define SBLOCK_PIGGY 262144
|
||
|
#define SBLOCKSIZE 8192
|
||
|
/*
|
||
|
* NB: Do not, under any circumstances, look for an ffsv1 filesystem at
|
||
|
* SBLOCK_UFS2. Doing so will find the wrong superblock for filesystems
|
||
|
* with a 64k block size.
|
||
|
*/
|
||
|
#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 file system format retains only a single pointer
|
||
|
* to such a fragment, which is a piece of a single large block that
|
||
|
* has been divided. The size of such a fragment is determinable from
|
||
|
* information in the inode, using the ``blksize(fs, ip, lbn)'' macro.
|
||
|
*
|
||
|
* The file system records space availability at the fragment level;
|
||
|
* to determine block availability, aligned fragments are examined.
|
||
|
*/
|
||
|
|
||
|
/*
|
||
|
* MINBSIZE is the smallest allowable block size.
|
||
|
* In order to insure that it is possible to create files of size
|
||
|
* 2^32 with only two levels of indirection, MINBSIZE is set to 4096.
|
||
|
* MINBSIZE must be big enough to hold a cylinder group block,
|
||
|
* thus changes to (struct cg) must keep its size within MINBSIZE.
|
||
|
* Note that super blocks are always of size SBSIZE,
|
||
|
* and that both SBSIZE and MAXBSIZE must be >= MINBSIZE.
|
||
|
*/
|
||
|
#define MINBSIZE 4096
|
||
|
|
||
|
/*
|
||
|
* The path name on which the file system is mounted is maintained
|
||
|
* in fs_fsmnt. MAXMNTLEN defines the amount of space allocated in
|
||
|
* the super block for this name.
|
||
|
*/
|
||
|
#define MAXMNTLEN 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
|
||
|
|
||
|
/*
|
||
|
* 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)
|
||
|
|
||
|
/*
|
||
|
* 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
|
||
|
|
||
|
/*
|
||
|
* Unused value currently, FreeBSD compat.
|
||
|
*/
|
||
|
#define FSMAXSNAP 20
|
||
|
|
||
|
/*
|
||
|
* MINFREE gives the minimum acceptable percentage of file system
|
||
|
* blocks which may be free. If the freelist drops below this level
|
||
|
* only the superuser may continue to allocate blocks. This may
|
||
|
* be set to 0 if no reserve of free blocks is deemed necessary,
|
||
|
* however throughput drops by fifty percent if the file system
|
||
|
* is run at between 95% and 100% full; thus the minimum default
|
||
|
* value of fs_minfree is 5%. However, to get good clustering
|
||
|
* performance, 10% is a better choice. hence we use 10% as our
|
||
|
* default value. With 10% free space, fragmentation is not a
|
||
|
* problem, so we choose to optimize for time.
|
||
|
*/
|
||
|
#define MINFREE 5
|
||
|
#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 */
|
||
|
|
||
|
/*
|
||
|
* 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_spare[4]; /* future expansion */
|
||
|
};
|
||
|
|
||
|
|
||
|
/*
|
||
|
* Super block for an FFS file system in memory.
|
||
|
*/
|
||
|
struct fs {
|
||
|
int32_t fs_firstfield; /* historic file system linked list, */
|
||
|
int32_t fs_unused_1; /* used for incore super blocks */
|
||
|
int32_t fs_sblkno; /* addr 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 */
|
||
|
/* these fields are derived from the hardware */
|
||
|
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 */
|
||
|
/* fs_id takes the space of the unused fs_headswitch and fs_trkseek fields */
|
||
|
int32_t fs_id[2]; /* unique file system 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 */
|
||
|
/* these fields are derived from the hardware */
|
||
|
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 file system */
|
||
|
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; /* file system is clean flag */
|
||
|
int8_t fs_ronly; /* mounted read-only flag */
|
||
|
uint8_t fs_old_flags; /* see FS_ flags below */
|
||
|
u_char fs_fsmnt[MAXMNTLEN]; /* name mounted on */
|
||
|
u_char fs_volname[MAXVOLLEN]; /* volume name */
|
||
|
uint64_t fs_swuid; /* system-wide uid */
|
||
|
int32_t fs_pad;
|
||
|
/* these fields retain the current block allocation info */
|
||
|
int32_t fs_cgrotor; /* last cg searched (UNUSED) */
|
||
|
void *fs_ocsp[NOCSPTRS]; /* padding; was list of fs_cs buffers */
|
||
|
u_int8_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 */
|
||
|
u_int *fs_active; /* used by snapshots to track fs */
|
||
|
int32_t fs_old_cpc; /* cyl per cycle in postbl */
|
||
|
/* this area is otherwise allocated unless fs_old_flags & FS_FLAGS_UPDATED */
|
||
|
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 */
|
||
|
int64_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 */
|
||
|
int64_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 */
|
||
|
/* back to stuff that has been around a while */
|
||
|
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 */
|
||
|
uint32_t fs_flags; /* see FS_ flags below */
|
||
|
/* back to stuff that has been around a while (again) */
|
||
|
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 (UNUSED) */
|
||
|
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 */
|
||
|
};
|
||
|
|
||
|
#define fs_old_postbloff fs_spare5[0]
|
||
|
#define fs_old_rotbloff fs_spare5[1]
|
||
|
#define fs_old_postbl_start fs_maxbsize
|
||
|
#define fs_old_headswitch fs_id[0]
|
||
|
#define fs_old_trkseek fs_id[1]
|
||
|
#define fs_old_csmask fs_spare1[0]
|
||
|
#define fs_old_csshift fs_spare1[1]
|
||
|
|
||
|
#define FS_42POSTBLFMT -1 /* 4.2BSD rotational table format */
|
||
|
#define FS_DYNAMICPOSTBLFMT 1 /* dynamic rotational table format */
|
||
|
|
||
|
#define old_fs_postbl(fs_, cylno, opostblsave) \
|
||
|
((((fs_)->fs_old_postblformat == FS_42POSTBLFMT) || \
|
||
|
((fs_)->fs_old_postbloff == offsetof(struct fs, fs_old_postbl_start))) \
|
||
|
? ((int16_t *)(opostblsave) + (cylno) * (fs_)->fs_old_nrpos) \
|
||
|
: ((int16_t *)((uint8_t *)(fs_) + \
|
||
|
(fs_)->fs_old_postbloff) + (cylno) * (fs_)->fs_old_nrpos))
|
||
|
#define old_fs_rotbl(fs) \
|
||
|
(((fs)->fs_old_postblformat == FS_42POSTBLFMT) \
|
||
|
? ((uint8_t *)(&(fs)->fs_magic+1)) \
|
||
|
: ((uint8_t *)((uint8_t *)(fs) + (fs)->fs_old_rotbloff)))
|
||
|
|
||
|
/*
|
||
|
* 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 FS_UFS1_MAGIC_SWAPPED 0x54190100
|
||
|
#define FS_UFS2_MAGIC_SWAPPED 0x19015419
|
||
|
#define FS_OKAY 0x7c269d38 /* superblock checksum */
|
||
|
#define FS_42INODEFMT -1 /* 4.2BSD inode format */
|
||
|
#define FS_44INODEFMT 2 /* 4.4BSD inode format */
|
||
|
|
||
|
/*
|
||
|
* File system clean flags
|
||
|
*/
|
||
|
#define FS_ISCLEAN 0x01
|
||
|
#define FS_WASCLEAN 0x02
|
||
|
|
||
|
/*
|
||
|
* Preference for optimization.
|
||
|
*/
|
||
|
#define FS_OPTTIME 0 /* minimize allocation time */
|
||
|
#define FS_OPTSPACE 1 /* minimize disk fragmentation */
|
||
|
|
||
|
/*
|
||
|
* File system flags
|
||
|
*/
|
||
|
#define FS_UNCLEAN 0x01 /* file system not clean at mount (unused) */
|
||
|
#define FS_DOSOFTDEP 0x02 /* file system using soft dependencies */
|
||
|
#define FS_NEEDSFSCK 0x04 /* needs sync fsck (FreeBSD compat, unused) */
|
||
|
#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 */
|
||
|
|
||
|
/*
|
||
|
* File system internal flags, also in fs_flags.
|
||
|
* (Pick highest number to avoid conflicts with others)
|
||
|
*/
|
||
|
#define FS_SWAPPED 0x80000000 /* file system is endian swapped */
|
||
|
#define FS_INTERNAL 0x80000000 /* mask for internal flags */
|
||
|
|
||
|
/*
|
||
|
* 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_IF(fs, ipg, fpg) \
|
||
|
/* base cg */ (sizeof(struct cg) + sizeof(int32_t) + \
|
||
|
/* old btotoff */ (fs)->fs_old_cpg * sizeof(int32_t) + \
|
||
|
/* old boff */ (fs)->fs_old_cpg * sizeof(u_int16_t) + \
|
||
|
/* inode map */ howmany((ipg), NBBY) + \
|
||
|
/* block map */ howmany((fpg), NBBY) +\
|
||
|
/* if present */ ((fs)->fs_contigsumsize <= 0 ? 0 : \
|
||
|
/* cluster sum */ (fs)->fs_contigsumsize * sizeof(int32_t) + \
|
||
|
/* cluster map */ howmany(fragstoblks(fs, (fpg)), NBBY)))
|
||
|
|
||
|
#define CGSIZE(fs) CGSIZE_IF((fs), (fs)->fs_ipg, (fs)->fs_fpg)
|
||
|
|
||
|
/*
|
||
|
* 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 file system.
|
||
|
*/
|
||
|
#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; /* (u_int16) free block positions */
|
||
|
int32_t cg_iusedoff; /* (u_int8) used inode map */
|
||
|
int32_t cg_freeoff; /* (u_int8) free block map */
|
||
|
int32_t cg_nextfreeoff; /* (u_int8) next available space */
|
||
|
int32_t cg_clustersumoff; /* (u_int32) counts of avail clusters */
|
||
|
int32_t cg_clusteroff; /* (u_int8) free cluster map */
|
||
|
int32_t cg_nclusterblks; /* number of clusters this cg */
|
||
|
int32_t cg_niblk; /* number of inode blocks this cg */
|
||
|
int32_t cg_initediblk; /* last initialized inode */
|
||
|
int32_t cg_sparecon32[3]; /* reserved for future use */
|
||
|
int64_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 */
|
||
|
};
|
||
|
|
||
|
/*
|
||
|
* The following structure is defined
|
||
|
* for compatibility with old file systems.
|
||
|
*/
|
||
|
struct ocg {
|
||
|
int32_t cg_firstfield; /* historic linked list of cyl groups */
|
||
|
int32_t cg_unused_1; /* used for incore cyl groups */
|
||
|
int32_t cg_time; /* time last written */
|
||
|
int32_t cg_cgx; /* we are the cgx'th cylinder group */
|
||
|
int16_t cg_ncyl; /* number of cyl's this cg */
|
||
|
int16_t cg_niblk; /* number of inode blocks this cg */
|
||
|
int32_t cg_ndblk; /* number of data blocks this cg */
|
||
|
struct csum cg_cs; /* cylinder summary information */
|
||
|
int32_t cg_rotor; /* position of last used block */
|
||
|
int32_t cg_frotor; /* position of last used frag */
|
||
|
int32_t cg_irotor; /* position of last used inode */
|
||
|
int32_t cg_frsum[8]; /* counts of available frags */
|
||
|
int32_t cg_btot[32]; /* block totals per cylinder */
|
||
|
int16_t cg_b[32][8]; /* positions of free blocks */
|
||
|
u_int8_t cg_iused[256]; /* used inode map */
|
||
|
int32_t cg_magic; /* magic number */
|
||
|
u_int8_t cg_free[1]; /* free block map */
|
||
|
/* actually longer */
|
||
|
};
|
||
|
|
||
|
|
||
|
/*
|
||
|
* Macros for access to cylinder group array structures.
|
||
|
*/
|
||
|
#define old_cg_blktot_old(cgp, ns) \
|
||
|
(((struct ocg *)(cgp))->cg_btot)
|
||
|
#define old_cg_blks_old(fs, cgp, cylno, ns) \
|
||
|
(((struct ocg *)(cgp))->cg_b[cylno])
|
||
|
|
||
|
#define old_cg_blktot_new(cgp, ns) \
|
||
|
((int32_t *)((u_int8_t *)(cgp) + \
|
||
|
ufs_rw32((cgp)->cg_old_btotoff, (ns))))
|
||
|
#define old_cg_blks_new(fs, cgp, cylno, ns) \
|
||
|
((int16_t *)((u_int8_t *)(cgp) + \
|
||
|
ufs_rw32((cgp)->cg_old_boff, (ns))) + (cylno) * (fs)->fs_old_nrpos)
|
||
|
|
||
|
#define old_cg_blktot(cgp, ns) \
|
||
|
((ufs_rw32((cgp)->cg_magic, (ns)) != CG_MAGIC) ? \
|
||
|
old_cg_blktot_old(cgp, ns) : old_cg_blktot_new(cgp, ns))
|
||
|
#define old_cg_blks(fs, cgp, cylno, ns) \
|
||
|
((ufs_rw32((cgp)->cg_magic, (ns)) != CG_MAGIC) ? \
|
||
|
old_cg_blks_old(fs, cgp, cylno, ns) : old_cg_blks_new(fs, cgp, cylno, ns))
|
||
|
|
||
|
#define cg_inosused_new(cgp, ns) \
|
||
|
((u_int8_t *)((u_int8_t *)(cgp) + \
|
||
|
ufs_rw32((cgp)->cg_iusedoff, (ns))))
|
||
|
#define cg_blksfree_new(cgp, ns) \
|
||
|
((u_int8_t *)((u_int8_t *)(cgp) + \
|
||
|
ufs_rw32((cgp)->cg_freeoff, (ns))))
|
||
|
#define cg_chkmagic_new(cgp, ns) \
|
||
|
(ufs_rw32((cgp)->cg_magic, (ns)) == CG_MAGIC)
|
||
|
|
||
|
#define cg_inosused_old(cgp, ns) \
|
||
|
(((struct ocg *)(cgp))->cg_iused)
|
||
|
#define cg_blksfree_old(cgp, ns) \
|
||
|
(((struct ocg *)(cgp))->cg_free)
|
||
|
#define cg_chkmagic_old(cgp, ns) \
|
||
|
(ufs_rw32(((struct ocg *)(cgp))->cg_magic, (ns)) == CG_MAGIC)
|
||
|
|
||
|
#define cg_inosused(cgp, ns) \
|
||
|
((ufs_rw32((cgp)->cg_magic, (ns)) != CG_MAGIC) ? \
|
||
|
cg_inosused_old(cgp, ns) : cg_inosused_new(cgp, ns))
|
||
|
#define cg_blksfree(cgp, ns) \
|
||
|
((ufs_rw32((cgp)->cg_magic, (ns)) != CG_MAGIC) ? \
|
||
|
cg_blksfree_old(cgp, ns) : cg_blksfree_new(cgp, ns))
|
||
|
#define cg_chkmagic(cgp, ns) \
|
||
|
(cg_chkmagic_new(cgp, ns) || cg_chkmagic_old(cgp, ns))
|
||
|
|
||
|
#define cg_clustersfree(cgp, ns) \
|
||
|
((u_int8_t *)((u_int8_t *)(cgp) + \
|
||
|
ufs_rw32((cgp)->cg_clusteroff, (ns))))
|
||
|
#define cg_clustersum(cgp, ns) \
|
||
|
((int32_t *)((u_int8_t *)(cgp) + \
|
||
|
ufs_rw32((cgp)->cg_clustersumoff, (ns))))
|
||
|
|
||
|
|
||
|
/*
|
||
|
* Turn file system block numbers into disk block addresses.
|
||
|
* This maps file system blocks to device size blocks.
|
||
|
*/
|
||
|
#define fsbtodb(fs, b) ((b) << (fs)->fs_fsbtodb)
|
||
|
#define dbtofsb(fs, b) ((b) >> (fs)->fs_fsbtodb)
|
||
|
|
||
|
/*
|
||
|
* Cylinder group macros to locate things in cylinder groups.
|
||
|
* They calc file system addresses of cylinder group data structures.
|
||
|
*/
|
||
|
#define cgbase(fs, c) (((daddr_t)(fs)->fs_fpg) * (c))
|
||
|
#define cgstart_ufs1(fs, c) \
|
||
|
(cgbase(fs, c) + (fs)->fs_old_cgoffset * ((c) & ~((fs)->fs_old_cgmask)))
|
||
|
#define cgstart_ufs2(fs, c) cgbase((fs), (c))
|
||
|
#define cgstart(fs, c) ((fs)->fs_magic == FS_UFS2_MAGIC \
|
||
|
? cgstart_ufs2((fs), (c)) : cgstart_ufs1((fs), (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 */
|
||
|
|
||
|
/*
|
||
|
* Macros for handling inode numbers:
|
||
|
* inode number to file system block offset.
|
||
|
* inode number to cylinder group number.
|
||
|
* inode number to file system block address.
|
||
|
*/
|
||
|
#define ino_to_cg(fs, x) ((x) / (fs)->fs_ipg)
|
||
|
#define ino_to_fsba(fs, x) \
|
||
|
((daddr_t)(cgimin(fs, ino_to_cg(fs, x)) + \
|
||
|
(blkstofrags((fs), (((x) % (fs)->fs_ipg) / INOPB(fs))))))
|
||
|
#define ino_to_fsbo(fs, x) ((x) % INOPB(fs))
|
||
|
|
||
|
/*
|
||
|
* Give cylinder group number for a file system block.
|
||
|
* Give cylinder group block number for a file system block.
|
||
|
*/
|
||
|
#define dtog(fs, d) ((d) / (fs)->fs_fpg)
|
||
|
#define dtogd(fs, d) ((d) % (fs)->fs_fpg)
|
||
|
|
||
|
/*
|
||
|
* Extract the bits for a block from a map.
|
||
|
* Compute the cylinder and rotational position of a cyl block addr.
|
||
|
*/
|
||
|
#define blkmap(fs, map, loc) \
|
||
|
(((map)[(loc) / NBBY] >> ((loc) % NBBY)) & (0xff >> (NBBY - (fs)->fs_frag)))
|
||
|
#define old_cbtocylno(fs, bno) \
|
||
|
(fsbtodb(fs, bno) / (fs)->fs_old_spc)
|
||
|
#define old_cbtorpos(fs, bno) \
|
||
|
((fs)->fs_old_nrpos <= 1 ? 0 : \
|
||
|
(fsbtodb(fs, bno) % (fs)->fs_old_spc / (fs)->fs_old_nsect * (fs)->fs_old_trackskew + \
|
||
|
fsbtodb(fs, bno) % (fs)->fs_old_spc % (fs)->fs_old_nsect * (fs)->fs_old_interleave) % \
|
||
|
(fs)->fs_old_nsect * (fs)->fs_old_nrpos / (fs)->fs_old_npsect)
|
||
|
|
||
|
/*
|
||
|
* The following macros optimize certain frequently calculated
|
||
|
* quantities by using shifts and masks in place of divisions
|
||
|
* modulos and multiplications.
|
||
|
*/
|
||
|
#define blkoff(fs, loc) /* calculates (loc % fs->fs_bsize) */ \
|
||
|
((loc) & (fs)->fs_qbmask)
|
||
|
#define fragoff(fs, loc) /* calculates (loc % fs->fs_fsize) */ \
|
||
|
((loc) & (fs)->fs_qfmask)
|
||
|
#define 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)
|
||
|
#define lblkno(fs, loc) /* calculates (loc / fs->fs_bsize) */ \
|
||
|
((loc) >> (fs)->fs_bshift)
|
||
|
#define numfrags(fs, loc) /* calculates (loc / fs->fs_fsize) */ \
|
||
|
((loc) >> (fs)->fs_fshift)
|
||
|
#define blkroundup(fs, size) /* calculates roundup(size, fs->fs_bsize) */ \
|
||
|
(((size) + (fs)->fs_qbmask) & (fs)->fs_bmask)
|
||
|
#define fragroundup(fs, size) /* calculates roundup(size, fs->fs_fsize) */ \
|
||
|
(((size) + (fs)->fs_qfmask) & (fs)->fs_fmask)
|
||
|
#define fragstoblks(fs, frags) /* calculates (frags / fs->fs_frag) */ \
|
||
|
((frags) >> (fs)->fs_fragshift)
|
||
|
#define blkstofrags(fs, blks) /* calculates (blks * fs->fs_frag) */ \
|
||
|
((blks) << (fs)->fs_fragshift)
|
||
|
#define fragnum(fs, fsb) /* calculates (fsb % fs->fs_frag) */ \
|
||
|
((fsb) & ((fs)->fs_frag - 1))
|
||
|
#define blknum(fs, fsb) /* calculates rounddown(fsb, fs->fs_frag) */ \
|
||
|
((fsb) &~ ((fs)->fs_frag - 1))
|
||
|
|
||
|
/*
|
||
|
* Determine the number of available frags given a
|
||
|
* percentage to hold in reserve.
|
||
|
*/
|
||
|
#define freespace(fs, percentreserved) \
|
||
|
(blkstofrags((fs), (fs)->fs_cstotal.cs_nbfree) + \
|
||
|
(fs)->fs_cstotal.cs_nffree - \
|
||
|
(((off_t)((fs)->fs_dsize)) * (percentreserved) / 100))
|
||
|
|
||
|
/*
|
||
|
* Determining the size of a file block in the file system.
|
||
|
*/
|
||
|
#define blksize(fs, ip, lbn) \
|
||
|
(((lbn) >= NDADDR || (ip)->i_size >= lblktosize(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 file system block.
|
||
|
*/
|
||
|
#define NINDIR(fs) ((fs)->fs_nindir)
|
||
|
|
||
|
/*
|
||
|
* Apple UFS Label:
|
||
|
* We check for this to decide to use APPLEUFS_DIRBLKSIZ
|
||
|
*/
|
||
|
#define APPLEUFS_LABEL_MAGIC 0x4c41424c /* LABL */
|
||
|
#define APPLEUFS_LABEL_SIZE 1024
|
||
|
#define APPLEUFS_LABEL_OFFSET (BBSIZE - APPLEUFS_LABEL_SIZE) /* located at 7k */
|
||
|
#define APPLEUFS_LABEL_VERSION 1
|
||
|
#define APPLEUFS_MAX_LABEL_NAME 512
|
||
|
|
||
|
#if 0
|
||
|
struct appleufslabel {
|
||
|
u_int32_t ul_magic;
|
||
|
u_int16_t ul_checksum;
|
||
|
u_int16_t ul_unused0;
|
||
|
u_int32_t ul_version;
|
||
|
u_int32_t ul_time;
|
||
|
u_int16_t ul_namelen;
|
||
|
u_char ul_name[APPLEUFS_MAX_LABEL_NAME]; /* Warning: may not be null terminated */
|
||
|
u_int16_t ul_unused1;
|
||
|
u_int64_t ul_uuid; /* Note this is only 4 byte aligned */
|
||
|
u_char ul_reserved[24];
|
||
|
u_char ul_unused[460];
|
||
|
} __attribute__((__packed__));
|
||
|
#endif
|
||
|
|
||
|
|
||
|
#endif /* !_UFS_FFS_FS_H_ */
|