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hellwig |
/* $NetBSD: fs.h,v 1.56 2011/03/06 17:08:38 bouyer Exp $ */
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/*
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* Copyright (c) 1982, 1986, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)fs.h 8.13 (Berkeley) 3/21/95
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*/
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/*
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* NOTE: COORDINATE ON-DISK FORMAT CHANGES WITH THE FREEBSD PROJECT.
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*/
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#ifndef _UFS_FFS_FS_H_
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#define _UFS_FFS_FS_H_
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/*
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* Each disk drive contains some number of file systems.
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* A file system consists of a number of cylinder groups.
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* Each cylinder group has inodes and data.
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*
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* A file system is described by its super-block, which in turn
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* describes the cylinder groups. The super-block is critical
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* data and is replicated in each cylinder group to protect against
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* catastrophic loss. This is done at `newfs' time and the critical
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* super-block data does not change, so the copies need not be
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* referenced further unless disaster strikes.
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*
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* For file system fs, the offsets of the various blocks of interest
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* are given in the super block as:
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* [fs->fs_sblkno] Super-block
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* [fs->fs_cblkno] Cylinder group block
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* [fs->fs_iblkno] Inode blocks
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* [fs->fs_dblkno] Data blocks
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* The beginning of cylinder group cg in fs, is given by
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* the ``cgbase(fs, cg)'' macro.
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*
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* Depending on the architecture and the media, the superblock may
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* reside in any one of four places. For tiny media where every block
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* counts, it is placed at the very front of the partition. Historically,
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* UFS1 placed it 8K from the front to leave room for the disk label and
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* a small bootstrap. For UFS2 it got moved to 64K from the front to leave
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* room for the disk label and a bigger bootstrap, and for really piggy
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* systems we check at 256K from the front if the first three fail. In
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* all cases the size of the superblock will be SBLOCKSIZE. All values are
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* given in byte-offset form, so they do not imply a sector size. The
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* SBLOCKSEARCH specifies the order in which the locations should be searched.
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*
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* Unfortunately the UFS2/FFSv2 change was done without adequate consideration
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* of backward compatibility. In particular 'newfs' for a FFSv2 partition
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* must overwrite any old FFSv1 superblock at 8k, and preferrably as many
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* of the alternates as it can find - otherwise attempting to mount on a
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* system that only supports FFSv1 is likely to succeed!.
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* For a small FFSv1 filesystem, an old FFSv2 superblock can be left on
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* the disk, and a system that tries to find an FFSv2 filesystem in preference
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* to and FFSv1 one (as NetBSD does) can mount the old FFSv2 filesystem.
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* As a added bonus, the 'first alternate' superblock of a FFSv1 filesystem
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* with 64k blocks is at 64k - just where the code looks first when playing
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* 'hunt the superblock'.
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*
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* The ffsv2 superblock layout (which might contain an ffsv1 filesystem)
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* can be detected by checking for sb->fs_old_flags & FS_FLAGS_UPDATED.
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* This is the default superblock type for NetBSD since ffsv2 support was added.
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*/
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#define BBSIZE 8192
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#define BBOFF ((off_t)(0))
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#define BBLOCK ((daddr_t)(0))
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#define SBLOCK_FLOPPY 0
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#define SBLOCK_UFS1 8192
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#define SBLOCK_UFS2 65536
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#define SBLOCK_PIGGY 262144
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#define SBLOCKSIZE 8192
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/*
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* NB: Do not, under any circumstances, look for an ffsv1 filesystem at
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* SBLOCK_UFS2. Doing so will find the wrong superblock for filesystems
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* with a 64k block size.
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*/
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#define SBLOCKSEARCH \
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{ SBLOCK_UFS2, SBLOCK_UFS1, SBLOCK_FLOPPY, SBLOCK_PIGGY, -1 }
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/*
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* Max number of fragments per block. This value is NOT tweakable.
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*/
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#define MAXFRAG 8
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/*
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* Addresses stored in inodes are capable of addressing fragments
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* of `blocks'. File system blocks of at most size MAXBSIZE can
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* be optionally broken into 2, 4, or 8 pieces, each of which is
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* addressable; these pieces may be DEV_BSIZE, or some multiple of
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* a DEV_BSIZE unit.
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*
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* Large files consist of exclusively large data blocks. To avoid
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* undue wasted disk space, the last data block of a small file may be
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* allocated as only as many fragments of a large block as are
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* necessary. The file system format retains only a single pointer
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* to such a fragment, which is a piece of a single large block that
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* has been divided. The size of such a fragment is determinable from
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* information in the inode, using the ``blksize(fs, ip, lbn)'' macro.
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*
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* The file system records space availability at the fragment level;
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* to determine block availability, aligned fragments are examined.
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*/
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/*
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* MINBSIZE is the smallest allowable block size.
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* In order to insure that it is possible to create files of size
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* 2^32 with only two levels of indirection, MINBSIZE is set to 4096.
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* MINBSIZE must be big enough to hold a cylinder group block,
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* thus changes to (struct cg) must keep its size within MINBSIZE.
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* Note that super blocks are always of size SBSIZE,
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* and that both SBSIZE and MAXBSIZE must be >= MINBSIZE.
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*/
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#define MINBSIZE 4096
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/*
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* The path name on which the file system is mounted is maintained
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* in fs_fsmnt. MAXMNTLEN defines the amount of space allocated in
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* the super block for this name.
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*/
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#define MAXMNTLEN 468
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/*
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* The volume name for this filesystem is maintained in fs_volname.
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* MAXVOLLEN defines the length of the buffer allocated.
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* This space used to be part of of fs_fsmnt.
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*/
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#define MAXVOLLEN 32
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/*
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* There is a 128-byte region in the superblock reserved for in-core
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* pointers to summary information. Originally this included an array
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* of pointers to blocks of struct csum; now there are just four
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* pointers and the remaining space is padded with fs_ocsp[].
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* NOCSPTRS determines the size of this padding. One pointer (fs_csp)
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* is taken away to point to a contiguous array of struct csum for
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* all cylinder groups; a second (fs_maxcluster) points to an array
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* of cluster sizes that is computed as cylinder groups are inspected;
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* the third (fs_contigdirs) points to an array that tracks the
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* creation of new directories; and the fourth (fs_active) is used
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* by snapshots.
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*/
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#define NOCSPTRS ((128 / sizeof(void *)) - 4)
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/*
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* A summary of contiguous blocks of various sizes is maintained
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* in each cylinder group. Normally this is set by the initial
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* value of fs_maxcontig. To conserve space, a maximum summary size
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* is set by FS_MAXCONTIG.
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*/
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#define FS_MAXCONTIG 16
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/*
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* The maximum number of snapshot nodes that can be associated
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* with each filesystem. This limit affects only the number of
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* snapshot files that can be recorded within the superblock so
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* that they can be found when the filesystem is mounted. However,
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* maintaining too many will slow the filesystem performance, so
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* having this limit is a good idea.
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*/
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#define FSMAXSNAP 20
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/*
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* Used to identify special blocks in snapshots:
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*
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* BLK_NOCOPY - A block that was unallocated at the time the snapshot
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* was taken, hence does not need to be copied when written.
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* BLK_SNAP - A block held by another snapshot that is not needed by this
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* snapshot. When the other snapshot is freed, the BLK_SNAP entries
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* are converted to BLK_NOCOPY. These are needed to allow fsck to
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* identify blocks that are in use by other snapshots (which are
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* expunged from this snapshot).
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*/
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#define BLK_NOCOPY ((daddr_t)(1))
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#define BLK_SNAP ((daddr_t)(2))
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/*
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* MINFREE gives the minimum acceptable percentage of file system
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* blocks which may be free. If the freelist drops below this level
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* only the superuser may continue to allocate blocks. This may
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* be set to 0 if no reserve of free blocks is deemed necessary,
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* however throughput drops by fifty percent if the file system
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* is run at between 95% and 100% full; thus the minimum default
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* value of fs_minfree is 5%. However, to get good clustering
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* performance, 10% is a better choice. This value is used only
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* when creating a file system and can be overriden from the
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* command line. By default we choose to optimize for time.
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*/
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#define MINFREE 5
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#define DEFAULTOPT FS_OPTTIME
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/*
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* Grigoriy Orlov <gluk@ptci.ru> has done some extensive work to fine
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* tune the layout preferences for directories within a filesystem.
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* His algorithm can be tuned by adjusting the following parameters
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* which tell the system the average file size and the average number
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* of files per directory. These defaults are well selected for typical
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* filesystems, but may need to be tuned for odd cases like filesystems
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* being used for squid caches or news spools.
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*/
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#define AVFILESIZ 16384 /* expected average file size */
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#define AFPDIR 64 /* expected number of files per directory */
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/*
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* Per cylinder group information; summarized in blocks allocated
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* from first cylinder group data blocks. These blocks have to be
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* read in from fs_csaddr (size fs_cssize) in addition to the
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* super block.
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*/
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struct csum {
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int32_t cs_ndir; /* number of directories */
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int32_t cs_nbfree; /* number of free blocks */
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int32_t cs_nifree; /* number of free inodes */
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int32_t cs_nffree; /* number of free frags */
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};
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struct csum_total {
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int64_t cs_ndir; /* number of directories */
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int64_t cs_nbfree; /* number of free blocks */
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int64_t cs_nifree; /* number of free inodes */
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int64_t cs_nffree; /* number of free frags */
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int64_t cs_spare[4]; /* future expansion */
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};
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/*
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* Super block for an FFS file system in memory.
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*/
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struct fs {
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int32_t fs_firstfield; /* historic file system linked list, */
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int32_t fs_unused_1; /* used for incore super blocks */
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int32_t fs_sblkno; /* addr of super-block in filesys */
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int32_t fs_cblkno; /* offset of cyl-block in filesys */
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int32_t fs_iblkno; /* offset of inode-blocks in filesys */
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int32_t fs_dblkno; /* offset of first data after cg */
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int32_t fs_old_cgoffset; /* cylinder group offset in cylinder */
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int32_t fs_old_cgmask; /* used to calc mod fs_ntrak */
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int32_t fs_old_time; /* last time written */
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int32_t fs_old_size; /* number of blocks in fs */
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int32_t fs_old_dsize; /* number of data blocks in fs */
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int32_t fs_ncg; /* number of cylinder groups */
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int32_t fs_bsize; /* size of basic blocks in fs */
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int32_t fs_fsize; /* size of frag blocks in fs */
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int32_t fs_frag; /* number of frags in a block in fs */
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/* these are configuration parameters */
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int32_t fs_minfree; /* minimum percentage of free blocks */
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int32_t fs_old_rotdelay; /* num of ms for optimal next block */
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int32_t fs_old_rps; /* disk revolutions per second */
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/* these fields can be computed from the others */
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int32_t fs_bmask; /* ``blkoff'' calc of blk offsets */
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int32_t fs_fmask; /* ``fragoff'' calc of frag offsets */
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int32_t fs_bshift; /* ``lblkno'' calc of logical blkno */
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int32_t fs_fshift; /* ``numfrags'' calc number of frags */
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/* these are configuration parameters */
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int32_t fs_maxcontig; /* max number of contiguous blks */
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int32_t fs_maxbpg; /* max number of blks per cyl group */
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/* these fields can be computed from the others */
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int32_t fs_fragshift; /* block to frag shift */
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int32_t fs_fsbtodb; /* fsbtodb and dbtofsb shift constant */
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int32_t fs_sbsize; /* actual size of super block */
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int32_t fs_spare1[2]; /* old fs_csmask */
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/* old fs_csshift */
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int32_t fs_nindir; /* value of NINDIR */
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int32_t fs_inopb; /* value of INOPB */
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int32_t fs_old_nspf; /* value of NSPF */
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/* yet another configuration parameter */
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int32_t fs_optim; /* optimization preference, see below */
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/* these fields are derived from the hardware */
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int32_t fs_old_npsect; /* # sectors/track including spares */
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int32_t fs_old_interleave; /* hardware sector interleave */
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int32_t fs_old_trackskew; /* sector 0 skew, per track */
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/* fs_id takes the space of the unused fs_headswitch and fs_trkseek fields */
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int32_t fs_id[2]; /* unique file system id */
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/* sizes determined by number of cylinder groups and their sizes */
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int32_t fs_old_csaddr; /* blk addr of cyl grp summary area */
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int32_t fs_cssize; /* size of cyl grp summary area */
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int32_t fs_cgsize; /* cylinder group size */
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/* these fields are derived from the hardware */
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int32_t fs_spare2; /* old fs_ntrak */
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int32_t fs_old_nsect; /* sectors per track */
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int32_t fs_old_spc; /* sectors per cylinder */
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int32_t fs_old_ncyl; /* cylinders in file system */
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int32_t fs_old_cpg; /* cylinders per group */
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|
|
int32_t fs_ipg; /* inodes per group */
|
312 |
|
|
int32_t fs_fpg; /* blocks per group * fs_frag */
|
313 |
|
|
/* this data must be re-computed after crashes */
|
314 |
|
|
struct csum fs_old_cstotal; /* cylinder summary information */
|
315 |
|
|
/* these fields are cleared at mount time */
|
316 |
|
|
int8_t fs_fmod; /* super block modified flag */
|
317 |
|
|
uint8_t fs_clean; /* file system is clean flag */
|
318 |
|
|
int8_t fs_ronly; /* mounted read-only flag */
|
319 |
|
|
uint8_t fs_old_flags; /* see FS_ flags below */
|
320 |
|
|
u_char fs_fsmnt[MAXMNTLEN]; /* name mounted on */
|
321 |
|
|
u_char fs_volname[MAXVOLLEN]; /* volume name */
|
322 |
|
|
uint64_t fs_swuid; /* system-wide uid */
|
323 |
|
|
int32_t fs_pad;
|
324 |
|
|
/* these fields retain the current block allocation info */
|
325 |
|
|
int32_t fs_cgrotor; /* last cg searched (UNUSED) */
|
326 |
|
|
void *fs_ocsp[NOCSPTRS]; /* padding; was list of fs_cs buffers */
|
327 |
|
|
u_int8_t *fs_contigdirs; /* # of contiguously allocated dirs */
|
328 |
|
|
struct csum *fs_csp; /* cg summary info buffer for fs_cs */
|
329 |
|
|
int32_t *fs_maxcluster; /* max cluster in each cyl group */
|
330 |
|
|
u_char *fs_active; /* used by snapshots to track fs */
|
331 |
|
|
int32_t fs_old_cpc; /* cyl per cycle in postbl */
|
332 |
|
|
/* this area is otherwise allocated unless fs_old_flags & FS_FLAGS_UPDATED */
|
333 |
|
|
int32_t fs_maxbsize; /* maximum blocking factor permitted */
|
334 |
|
|
uint8_t fs_journal_version; /* journal format version */
|
335 |
|
|
uint8_t fs_journal_location; /* journal location type */
|
336 |
|
|
uint8_t fs_journal_reserved[2];/* reserved for future use */
|
337 |
|
|
uint32_t fs_journal_flags; /* journal flags */
|
338 |
|
|
uint64_t fs_journallocs[4]; /* location info for journal */
|
339 |
|
|
uint32_t fs_quota_magic; /* see quota2.h */
|
340 |
|
|
uint8_t fs_quota_flags; /* see quota2.h */
|
341 |
|
|
uint8_t fs_quota_reserved[3];
|
342 |
|
|
uint64_t fs_quotafile[2]; /* pointer to quota inodes */
|
343 |
|
|
int64_t fs_sparecon64[9]; /* reserved for future use */
|
344 |
|
|
int64_t fs_sblockloc; /* byte offset of standard superblock */
|
345 |
|
|
struct csum_total fs_cstotal; /* cylinder summary information */
|
346 |
|
|
int64_t fs_time; /* last time written */
|
347 |
|
|
int64_t fs_size; /* number of blocks in fs */
|
348 |
|
|
int64_t fs_dsize; /* number of data blocks in fs */
|
349 |
|
|
int64_t fs_csaddr; /* blk addr of cyl grp summary area */
|
350 |
|
|
int64_t fs_pendingblocks; /* blocks in process of being freed */
|
351 |
|
|
int32_t fs_pendinginodes; /* inodes in process of being freed */
|
352 |
|
|
int32_t fs_snapinum[FSMAXSNAP];/* list of snapshot inode numbers */
|
353 |
|
|
/* back to stuff that has been around a while */
|
354 |
|
|
int32_t fs_avgfilesize; /* expected average file size */
|
355 |
|
|
int32_t fs_avgfpdir; /* expected # of files per directory */
|
356 |
|
|
int32_t fs_save_cgsize; /* save real cg size to use fs_bsize */
|
357 |
|
|
int32_t fs_sparecon32[26]; /* reserved for future constants */
|
358 |
|
|
uint32_t fs_flags; /* see FS_ flags below */
|
359 |
|
|
/* back to stuff that has been around a while (again) */
|
360 |
|
|
int32_t fs_contigsumsize; /* size of cluster summary array */
|
361 |
|
|
int32_t fs_maxsymlinklen; /* max length of an internal symlink */
|
362 |
|
|
int32_t fs_old_inodefmt; /* format of on-disk inodes */
|
363 |
|
|
u_int64_t fs_maxfilesize; /* maximum representable file size */
|
364 |
|
|
int64_t fs_qbmask; /* ~fs_bmask for use with 64-bit size */
|
365 |
|
|
int64_t fs_qfmask; /* ~fs_fmask for use with 64-bit size */
|
366 |
|
|
int32_t fs_state; /* validate fs_clean field (UNUSED) */
|
367 |
|
|
int32_t fs_old_postblformat; /* format of positional layout tables */
|
368 |
|
|
int32_t fs_old_nrpos; /* number of rotational positions */
|
369 |
|
|
int32_t fs_spare5[2]; /* old fs_postbloff */
|
370 |
|
|
/* old fs_rotbloff */
|
371 |
|
|
int32_t fs_magic; /* magic number */
|
372 |
|
|
};
|
373 |
|
|
|
374 |
|
|
#define fs_old_postbloff fs_spare5[0]
|
375 |
|
|
#define fs_old_rotbloff fs_spare5[1]
|
376 |
|
|
#define fs_old_postbl_start fs_maxbsize
|
377 |
|
|
#define fs_old_headswitch fs_id[0]
|
378 |
|
|
#define fs_old_trkseek fs_id[1]
|
379 |
|
|
#define fs_old_csmask fs_spare1[0]
|
380 |
|
|
#define fs_old_csshift fs_spare1[1]
|
381 |
|
|
|
382 |
|
|
#define FS_42POSTBLFMT -1 /* 4.2BSD rotational table format */
|
383 |
|
|
#define FS_DYNAMICPOSTBLFMT 1 /* dynamic rotational table format */
|
384 |
|
|
|
385 |
|
|
#define old_fs_postbl(fs_, cylno, opostblsave) \
|
386 |
|
|
((((fs_)->fs_old_postblformat == FS_42POSTBLFMT) || \
|
387 |
|
|
((fs_)->fs_old_postbloff == offsetof(struct fs, fs_old_postbl_start))) \
|
388 |
|
|
? ((int16_t *)(opostblsave) + (cylno) * (fs_)->fs_old_nrpos) \
|
389 |
|
|
: ((int16_t *)((uint8_t *)(fs_) + \
|
390 |
|
|
(fs_)->fs_old_postbloff) + (cylno) * (fs_)->fs_old_nrpos))
|
391 |
|
|
#define old_fs_rotbl(fs) \
|
392 |
|
|
(((fs)->fs_old_postblformat == FS_42POSTBLFMT) \
|
393 |
|
|
? ((uint8_t *)(&(fs)->fs_magic+1)) \
|
394 |
|
|
: ((uint8_t *)((uint8_t *)(fs) + (fs)->fs_old_rotbloff)))
|
395 |
|
|
|
396 |
|
|
/*
|
397 |
|
|
* File system identification
|
398 |
|
|
*/
|
399 |
|
|
#define FS_UFS1_MAGIC 0x011954 /* UFS1 fast file system magic number */
|
400 |
|
|
#define FS_UFS2_MAGIC 0x19540119 /* UFS2 fast file system magic number */
|
401 |
|
|
#define FS_UFS1_MAGIC_SWAPPED 0x54190100
|
402 |
|
|
#define FS_UFS2_MAGIC_SWAPPED 0x19015419
|
403 |
|
|
#define FS_OKAY 0x7c269d38 /* superblock checksum */
|
404 |
|
|
#define FS_42INODEFMT -1 /* 4.2BSD inode format */
|
405 |
|
|
#define FS_44INODEFMT 2 /* 4.4BSD inode format */
|
406 |
|
|
|
407 |
|
|
/*
|
408 |
|
|
* File system clean flags
|
409 |
|
|
*/
|
410 |
|
|
#define FS_ISCLEAN 0x01
|
411 |
|
|
#define FS_WASCLEAN 0x02
|
412 |
|
|
|
413 |
|
|
/*
|
414 |
|
|
* Preference for optimization.
|
415 |
|
|
*/
|
416 |
|
|
#define FS_OPTTIME 0 /* minimize allocation time */
|
417 |
|
|
#define FS_OPTSPACE 1 /* minimize disk fragmentation */
|
418 |
|
|
|
419 |
|
|
/*
|
420 |
|
|
* File system flags
|
421 |
|
|
*/
|
422 |
|
|
#define FS_UNCLEAN 0x001 /* file system not clean at mount (unused) */
|
423 |
|
|
#define FS_DOSOFTDEP 0x002 /* file system using soft dependencies */
|
424 |
|
|
#define FS_NEEDSFSCK 0x004 /* needs sync fsck (FreeBSD compat, unused) */
|
425 |
|
|
#define FS_INDEXDIRS 0x008 /* kernel supports indexed directories */
|
426 |
|
|
#define FS_ACLS 0x010 /* file system has ACLs enabled */
|
427 |
|
|
#define FS_MULTILABEL 0x020 /* file system is MAC multi-label */
|
428 |
|
|
#define FS_GJOURNAL 0x40 /* gjournaled file system */
|
429 |
|
|
#define FS_FLAGS_UPDATED 0x80 /* flags have been moved to new location */
|
430 |
|
|
#define FS_DOWAPBL 0x100 /* Write ahead physical block logging */
|
431 |
|
|
#define FS_DOQUOTA2 0x200 /* in-filesystem quotas */
|
432 |
|
|
|
433 |
|
|
/* File system flags that are ok for NetBSD if set in fs_flags */
|
434 |
|
|
#define FS_KNOWN_FLAGS (FS_DOSOFTDEP | FS_DOWAPBL | FS_DOQUOTA2)
|
435 |
|
|
|
436 |
|
|
/*
|
437 |
|
|
* File system internal flags, also in fs_flags.
|
438 |
|
|
* (Pick highest number to avoid conflicts with others)
|
439 |
|
|
*/
|
440 |
|
|
#define FS_SWAPPED 0x80000000 /* file system is endian swapped */
|
441 |
|
|
#define FS_INTERNAL 0x80000000 /* mask for internal flags */
|
442 |
|
|
|
443 |
|
|
/*
|
444 |
|
|
* Macros to access bits in the fs_active array.
|
445 |
|
|
*/
|
446 |
|
|
#define ACTIVECG_SET(fs, cg) \
|
447 |
|
|
do { \
|
448 |
|
|
if ((fs)->fs_active != NULL) \
|
449 |
|
|
setbit((fs)->fs_active, (cg)); \
|
450 |
|
|
} while (/*CONSTCOND*/ 0)
|
451 |
|
|
#define ACTIVECG_CLR(fs, cg) \
|
452 |
|
|
do { \
|
453 |
|
|
if ((fs)->fs_active != NULL) \
|
454 |
|
|
clrbit((fs)->fs_active, (cg)); \
|
455 |
|
|
} while (/*CONSTCOND*/ 0)
|
456 |
|
|
#define ACTIVECG_ISSET(fs, cg) \
|
457 |
|
|
((fs)->fs_active != NULL && isset((fs)->fs_active, (cg)))
|
458 |
|
|
|
459 |
|
|
/*
|
460 |
|
|
* The size of a cylinder group is calculated by CGSIZE. The maximum size
|
461 |
|
|
* is limited by the fact that cylinder groups are at most one block.
|
462 |
|
|
* Its size is derived from the size of the maps maintained in the
|
463 |
|
|
* cylinder group and the (struct cg) size.
|
464 |
|
|
*/
|
465 |
|
|
#define CGSIZE_IF(fs, ipg, fpg) \
|
466 |
|
|
/* base cg */ (sizeof(struct cg) + sizeof(int32_t) + \
|
467 |
|
|
/* old btotoff */ (fs)->fs_old_cpg * sizeof(int32_t) + \
|
468 |
|
|
/* old boff */ (fs)->fs_old_cpg * sizeof(u_int16_t) + \
|
469 |
|
|
/* inode map */ howmany((ipg), NBBY) + \
|
470 |
|
|
/* block map */ howmany((fpg), NBBY) +\
|
471 |
|
|
/* if present */ ((fs)->fs_contigsumsize <= 0 ? 0 : \
|
472 |
|
|
/* cluster sum */ (fs)->fs_contigsumsize * sizeof(int32_t) + \
|
473 |
|
|
/* cluster map */ howmany(fragstoblks(fs, (fpg)), NBBY)))
|
474 |
|
|
|
475 |
|
|
#define CGSIZE(fs) CGSIZE_IF((fs), (fs)->fs_ipg, (fs)->fs_fpg)
|
476 |
|
|
|
477 |
|
|
/*
|
478 |
|
|
* The minimal number of cylinder groups that should be created.
|
479 |
|
|
*/
|
480 |
|
|
#define MINCYLGRPS 4
|
481 |
|
|
|
482 |
|
|
|
483 |
|
|
/*
|
484 |
|
|
* Convert cylinder group to base address of its global summary info.
|
485 |
|
|
*/
|
486 |
|
|
#define fs_cs(fs, indx) fs_csp[indx]
|
487 |
|
|
|
488 |
|
|
/*
|
489 |
|
|
* Cylinder group block for a file system.
|
490 |
|
|
*/
|
491 |
|
|
#define CG_MAGIC 0x090255
|
492 |
|
|
struct cg {
|
493 |
|
|
int32_t cg_firstfield; /* historic cyl groups linked list */
|
494 |
|
|
int32_t cg_magic; /* magic number */
|
495 |
|
|
int32_t cg_old_time; /* time last written */
|
496 |
|
|
int32_t cg_cgx; /* we are the cgx'th cylinder group */
|
497 |
|
|
int16_t cg_old_ncyl; /* number of cyl's this cg */
|
498 |
|
|
int16_t cg_old_niblk; /* number of inode blocks this cg */
|
499 |
|
|
int32_t cg_ndblk; /* number of data blocks this cg */
|
500 |
|
|
struct csum cg_cs; /* cylinder summary information */
|
501 |
|
|
int32_t cg_rotor; /* position of last used block */
|
502 |
|
|
int32_t cg_frotor; /* position of last used frag */
|
503 |
|
|
int32_t cg_irotor; /* position of last used inode */
|
504 |
|
|
int32_t cg_frsum[MAXFRAG]; /* counts of available frags */
|
505 |
|
|
int32_t cg_old_btotoff; /* (int32) block totals per cylinder */
|
506 |
|
|
int32_t cg_old_boff; /* (u_int16) free block positions */
|
507 |
|
|
int32_t cg_iusedoff; /* (u_int8) used inode map */
|
508 |
|
|
int32_t cg_freeoff; /* (u_int8) free block map */
|
509 |
|
|
int32_t cg_nextfreeoff; /* (u_int8) next available space */
|
510 |
|
|
int32_t cg_clustersumoff; /* (u_int32) counts of avail clusters */
|
511 |
|
|
int32_t cg_clusteroff; /* (u_int8) free cluster map */
|
512 |
|
|
int32_t cg_nclusterblks; /* number of clusters this cg */
|
513 |
|
|
int32_t cg_niblk; /* number of inode blocks this cg */
|
514 |
|
|
int32_t cg_initediblk; /* last initialized inode */
|
515 |
|
|
int32_t cg_sparecon32[3]; /* reserved for future use */
|
516 |
|
|
int64_t cg_time; /* time last written */
|
517 |
|
|
int64_t cg_sparecon64[3]; /* reserved for future use */
|
518 |
|
|
u_int8_t cg_space[1]; /* space for cylinder group maps */
|
519 |
|
|
/* actually longer */
|
520 |
|
|
};
|
521 |
|
|
|
522 |
|
|
/*
|
523 |
|
|
* The following structure is defined
|
524 |
|
|
* for compatibility with old file systems.
|
525 |
|
|
*/
|
526 |
|
|
struct ocg {
|
527 |
|
|
int32_t cg_firstfield; /* historic linked list of cyl groups */
|
528 |
|
|
int32_t cg_unused_1; /* used for incore cyl groups */
|
529 |
|
|
int32_t cg_time; /* time last written */
|
530 |
|
|
int32_t cg_cgx; /* we are the cgx'th cylinder group */
|
531 |
|
|
int16_t cg_ncyl; /* number of cyl's this cg */
|
532 |
|
|
int16_t cg_niblk; /* number of inode blocks this cg */
|
533 |
|
|
int32_t cg_ndblk; /* number of data blocks this cg */
|
534 |
|
|
struct csum cg_cs; /* cylinder summary information */
|
535 |
|
|
int32_t cg_rotor; /* position of last used block */
|
536 |
|
|
int32_t cg_frotor; /* position of last used frag */
|
537 |
|
|
int32_t cg_irotor; /* position of last used inode */
|
538 |
|
|
int32_t cg_frsum[8]; /* counts of available frags */
|
539 |
|
|
int32_t cg_btot[32]; /* block totals per cylinder */
|
540 |
|
|
int16_t cg_b[32][8]; /* positions of free blocks */
|
541 |
|
|
u_int8_t cg_iused[256]; /* used inode map */
|
542 |
|
|
int32_t cg_magic; /* magic number */
|
543 |
|
|
u_int8_t cg_free[1]; /* free block map */
|
544 |
|
|
/* actually longer */
|
545 |
|
|
};
|
546 |
|
|
|
547 |
|
|
|
548 |
|
|
/*
|
549 |
|
|
* Macros for access to cylinder group array structures.
|
550 |
|
|
*/
|
551 |
|
|
#define old_cg_blktot_old(cgp, ns) \
|
552 |
|
|
(((struct ocg *)(cgp))->cg_btot)
|
553 |
|
|
#define old_cg_blks_old(fs, cgp, cylno, ns) \
|
554 |
|
|
(((struct ocg *)(cgp))->cg_b[cylno])
|
555 |
|
|
|
556 |
|
|
#define old_cg_blktot_new(cgp, ns) \
|
557 |
|
|
((int32_t *)((u_int8_t *)(cgp) + \
|
558 |
|
|
ufs_rw32((cgp)->cg_old_btotoff, (ns))))
|
559 |
|
|
#define old_cg_blks_new(fs, cgp, cylno, ns) \
|
560 |
|
|
((int16_t *)((u_int8_t *)(cgp) + \
|
561 |
|
|
ufs_rw32((cgp)->cg_old_boff, (ns))) + (cylno) * (fs)->fs_old_nrpos)
|
562 |
|
|
|
563 |
|
|
#define old_cg_blktot(cgp, ns) \
|
564 |
|
|
((ufs_rw32((cgp)->cg_magic, (ns)) != CG_MAGIC) ? \
|
565 |
|
|
old_cg_blktot_old(cgp, ns) : old_cg_blktot_new(cgp, ns))
|
566 |
|
|
#define old_cg_blks(fs, cgp, cylno, ns) \
|
567 |
|
|
((ufs_rw32((cgp)->cg_magic, (ns)) != CG_MAGIC) ? \
|
568 |
|
|
old_cg_blks_old(fs, cgp, cylno, ns) : old_cg_blks_new(fs, cgp, cylno, ns))
|
569 |
|
|
|
570 |
|
|
#define cg_inosused_new(cgp, ns) \
|
571 |
|
|
((u_int8_t *)((u_int8_t *)(cgp) + \
|
572 |
|
|
ufs_rw32((cgp)->cg_iusedoff, (ns))))
|
573 |
|
|
#define cg_blksfree_new(cgp, ns) \
|
574 |
|
|
((u_int8_t *)((u_int8_t *)(cgp) + \
|
575 |
|
|
ufs_rw32((cgp)->cg_freeoff, (ns))))
|
576 |
|
|
#define cg_chkmagic_new(cgp, ns) \
|
577 |
|
|
(ufs_rw32((cgp)->cg_magic, (ns)) == CG_MAGIC)
|
578 |
|
|
|
579 |
|
|
#define cg_inosused_old(cgp, ns) \
|
580 |
|
|
(((struct ocg *)(cgp))->cg_iused)
|
581 |
|
|
#define cg_blksfree_old(cgp, ns) \
|
582 |
|
|
(((struct ocg *)(cgp))->cg_free)
|
583 |
|
|
#define cg_chkmagic_old(cgp, ns) \
|
584 |
|
|
(ufs_rw32(((struct ocg *)(cgp))->cg_magic, (ns)) == CG_MAGIC)
|
585 |
|
|
|
586 |
|
|
#define cg_inosused(cgp, ns) \
|
587 |
|
|
((ufs_rw32((cgp)->cg_magic, (ns)) != CG_MAGIC) ? \
|
588 |
|
|
cg_inosused_old(cgp, ns) : cg_inosused_new(cgp, ns))
|
589 |
|
|
#define cg_blksfree(cgp, ns) \
|
590 |
|
|
((ufs_rw32((cgp)->cg_magic, (ns)) != CG_MAGIC) ? \
|
591 |
|
|
cg_blksfree_old(cgp, ns) : cg_blksfree_new(cgp, ns))
|
592 |
|
|
#define cg_chkmagic(cgp, ns) \
|
593 |
|
|
(cg_chkmagic_new(cgp, ns) || cg_chkmagic_old(cgp, ns))
|
594 |
|
|
|
595 |
|
|
#define cg_clustersfree(cgp, ns) \
|
596 |
|
|
((u_int8_t *)((u_int8_t *)(cgp) + \
|
597 |
|
|
ufs_rw32((cgp)->cg_clusteroff, (ns))))
|
598 |
|
|
#define cg_clustersum(cgp, ns) \
|
599 |
|
|
((int32_t *)((u_int8_t *)(cgp) + \
|
600 |
|
|
ufs_rw32((cgp)->cg_clustersumoff, (ns))))
|
601 |
|
|
|
602 |
|
|
|
603 |
|
|
/*
|
604 |
|
|
* Turn file system block numbers into disk block addresses.
|
605 |
|
|
* This maps file system blocks to device size blocks.
|
606 |
|
|
*/
|
607 |
|
|
#if defined (_KERNEL)
|
608 |
|
|
#define fsbtodb(fs, b) ((b) << ((fs)->fs_fshift - DEV_BSHIFT))
|
609 |
|
|
#define dbtofsb(fs, b) ((b) >> ((fs)->fs_fshift - DEV_BSHIFT))
|
610 |
|
|
#else
|
611 |
|
|
#define fsbtodb(fs, b) ((b) << (fs)->fs_fsbtodb)
|
612 |
|
|
#define dbtofsb(fs, b) ((b) >> (fs)->fs_fsbtodb)
|
613 |
|
|
#endif
|
614 |
|
|
|
615 |
|
|
/*
|
616 |
|
|
* Cylinder group macros to locate things in cylinder groups.
|
617 |
|
|
* They calc file system addresses of cylinder group data structures.
|
618 |
|
|
*/
|
619 |
|
|
#define cgbase(fs, c) (((daddr_t)(fs)->fs_fpg) * (c))
|
620 |
|
|
#define cgstart_ufs1(fs, c) \
|
621 |
|
|
(cgbase(fs, c) + (fs)->fs_old_cgoffset * ((c) & ~((fs)->fs_old_cgmask)))
|
622 |
|
|
#define cgstart_ufs2(fs, c) cgbase((fs), (c))
|
623 |
|
|
#define cgstart(fs, c) ((fs)->fs_magic == FS_UFS2_MAGIC \
|
624 |
|
|
? cgstart_ufs2((fs), (c)) : cgstart_ufs1((fs), (c)))
|
625 |
|
|
#define cgdmin(fs, c) (cgstart(fs, c) + (fs)->fs_dblkno) /* 1st data */
|
626 |
|
|
#define cgimin(fs, c) (cgstart(fs, c) + (fs)->fs_iblkno) /* inode blk */
|
627 |
|
|
#define cgsblock(fs, c) (cgstart(fs, c) + (fs)->fs_sblkno) /* super blk */
|
628 |
|
|
#define cgtod(fs, c) (cgstart(fs, c) + (fs)->fs_cblkno) /* cg block */
|
629 |
|
|
|
630 |
|
|
/*
|
631 |
|
|
* Macros for handling inode numbers:
|
632 |
|
|
* inode number to file system block offset.
|
633 |
|
|
* inode number to cylinder group number.
|
634 |
|
|
* inode number to file system block address.
|
635 |
|
|
*/
|
636 |
|
|
#define ino_to_cg(fs, x) ((x) / (fs)->fs_ipg)
|
637 |
|
|
#define ino_to_fsba(fs, x) \
|
638 |
|
|
((daddr_t)(cgimin(fs, ino_to_cg(fs, x)) + \
|
639 |
|
|
(blkstofrags((fs), (((x) % (fs)->fs_ipg) / INOPB(fs))))))
|
640 |
|
|
#define ino_to_fsbo(fs, x) ((x) % INOPB(fs))
|
641 |
|
|
|
642 |
|
|
/*
|
643 |
|
|
* Give cylinder group number for a file system block.
|
644 |
|
|
* Give cylinder group block number for a file system block.
|
645 |
|
|
*/
|
646 |
|
|
#define dtog(fs, d) ((d) / (fs)->fs_fpg)
|
647 |
|
|
#define dtogd(fs, d) ((d) % (fs)->fs_fpg)
|
648 |
|
|
|
649 |
|
|
/*
|
650 |
|
|
* Extract the bits for a block from a map.
|
651 |
|
|
* Compute the cylinder and rotational position of a cyl block addr.
|
652 |
|
|
*/
|
653 |
|
|
#define blkmap(fs, map, loc) \
|
654 |
|
|
(((map)[(loc) / NBBY] >> ((loc) % NBBY)) & (0xff >> (NBBY - (fs)->fs_frag)))
|
655 |
|
|
#define old_cbtocylno(fs, bno) \
|
656 |
|
|
(fsbtodb(fs, bno) / (fs)->fs_old_spc)
|
657 |
|
|
#define old_cbtorpos(fs, bno) \
|
658 |
|
|
((fs)->fs_old_nrpos <= 1 ? 0 : \
|
659 |
|
|
(fsbtodb(fs, bno) % (fs)->fs_old_spc / (fs)->fs_old_nsect * (fs)->fs_old_trackskew + \
|
660 |
|
|
fsbtodb(fs, bno) % (fs)->fs_old_spc % (fs)->fs_old_nsect * (fs)->fs_old_interleave) % \
|
661 |
|
|
(fs)->fs_old_nsect * (fs)->fs_old_nrpos / (fs)->fs_old_npsect)
|
662 |
|
|
|
663 |
|
|
/*
|
664 |
|
|
* The following macros optimize certain frequently calculated
|
665 |
|
|
* quantities by using shifts and masks in place of divisions
|
666 |
|
|
* modulos and multiplications.
|
667 |
|
|
*/
|
668 |
|
|
#define blkoff(fs, loc) /* calculates (loc % fs->fs_bsize) */ \
|
669 |
|
|
((loc) & (fs)->fs_qbmask)
|
670 |
|
|
#define fragoff(fs, loc) /* calculates (loc % fs->fs_fsize) */ \
|
671 |
|
|
((loc) & (fs)->fs_qfmask)
|
672 |
|
|
#define lfragtosize(fs, frag) /* calculates ((off_t)frag * fs->fs_fsize) */ \
|
673 |
|
|
(((off_t)(frag)) << (fs)->fs_fshift)
|
674 |
|
|
#define lblktosize(fs, blk) /* calculates ((off_t)blk * fs->fs_bsize) */ \
|
675 |
|
|
(((off_t)(blk)) << (fs)->fs_bshift)
|
676 |
|
|
#define lblkno(fs, loc) /* calculates (loc / fs->fs_bsize) */ \
|
677 |
|
|
((loc) >> (fs)->fs_bshift)
|
678 |
|
|
#define numfrags(fs, loc) /* calculates (loc / fs->fs_fsize) */ \
|
679 |
|
|
((loc) >> (fs)->fs_fshift)
|
680 |
|
|
#define blkroundup(fs, size) /* calculates roundup(size, fs->fs_bsize) */ \
|
681 |
|
|
(((size) + (fs)->fs_qbmask) & (fs)->fs_bmask)
|
682 |
|
|
#define fragroundup(fs, size) /* calculates roundup(size, fs->fs_fsize) */ \
|
683 |
|
|
(((size) + (fs)->fs_qfmask) & (fs)->fs_fmask)
|
684 |
|
|
#define fragstoblks(fs, frags) /* calculates (frags / fs->fs_frag) */ \
|
685 |
|
|
((frags) >> (fs)->fs_fragshift)
|
686 |
|
|
#define blkstofrags(fs, blks) /* calculates (blks * fs->fs_frag) */ \
|
687 |
|
|
((blks) << (fs)->fs_fragshift)
|
688 |
|
|
#define fragnum(fs, fsb) /* calculates (fsb % fs->fs_frag) */ \
|
689 |
|
|
((fsb) & ((fs)->fs_frag - 1))
|
690 |
|
|
#define blknum(fs, fsb) /* calculates rounddown(fsb, fs->fs_frag) */ \
|
691 |
|
|
((fsb) &~ ((fs)->fs_frag - 1))
|
692 |
|
|
|
693 |
|
|
/*
|
694 |
|
|
* Determine the number of available frags given a
|
695 |
|
|
* percentage to hold in reserve.
|
696 |
|
|
*/
|
697 |
|
|
#define freespace(fs, percentreserved) \
|
698 |
|
|
(blkstofrags((fs), (fs)->fs_cstotal.cs_nbfree) + \
|
699 |
|
|
(fs)->fs_cstotal.cs_nffree - \
|
700 |
|
|
(((off_t)((fs)->fs_dsize)) * (percentreserved) / 100))
|
701 |
|
|
|
702 |
|
|
/*
|
703 |
|
|
* Determining the size of a file block in the file system.
|
704 |
|
|
*/
|
705 |
|
|
#define blksize(fs, ip, lbn) \
|
706 |
|
|
(((lbn) >= NDADDR || (ip)->i_size >= lblktosize(fs, (lbn) + 1)) \
|
707 |
|
|
? (fs)->fs_bsize \
|
708 |
|
|
: (fragroundup(fs, blkoff(fs, (ip)->i_size))))
|
709 |
|
|
|
710 |
|
|
#define sblksize(fs, size, lbn) \
|
711 |
|
|
(((lbn) >= NDADDR || (size) >= ((lbn) + 1) << (fs)->fs_bshift) \
|
712 |
|
|
? (fs)->fs_bsize \
|
713 |
|
|
: (fragroundup(fs, blkoff(fs, (size)))))
|
714 |
|
|
|
715 |
|
|
|
716 |
|
|
/*
|
717 |
|
|
* Number of inodes in a secondary storage block/fragment.
|
718 |
|
|
*/
|
719 |
|
|
#define INOPB(fs) ((fs)->fs_inopb)
|
720 |
|
|
#define INOPF(fs) ((fs)->fs_inopb >> (fs)->fs_fragshift)
|
721 |
|
|
|
722 |
|
|
/*
|
723 |
|
|
* Number of indirects in a file system block.
|
724 |
|
|
*/
|
725 |
|
|
#define NINDIR(fs) ((fs)->fs_nindir)
|
726 |
|
|
|
727 |
|
|
/*
|
728 |
|
|
* Apple UFS Label:
|
729 |
|
|
* We check for this to decide to use APPLEUFS_DIRBLKSIZ
|
730 |
|
|
*/
|
731 |
|
|
#define APPLEUFS_LABEL_MAGIC 0x4c41424c /* LABL */
|
732 |
|
|
#define APPLEUFS_LABEL_SIZE 1024
|
733 |
|
|
#define APPLEUFS_LABEL_OFFSET (BBSIZE - APPLEUFS_LABEL_SIZE) /* located at 7k */
|
734 |
|
|
#define APPLEUFS_LABEL_VERSION 1
|
735 |
|
|
#define APPLEUFS_MAX_LABEL_NAME 512
|
736 |
|
|
|
737 |
|
|
struct appleufslabel {
|
738 |
|
|
u_int32_t ul_magic;
|
739 |
|
|
u_int16_t ul_checksum;
|
740 |
|
|
u_int16_t ul_unused0;
|
741 |
|
|
u_int32_t ul_version;
|
742 |
|
|
u_int32_t ul_time;
|
743 |
|
|
u_int16_t ul_namelen;
|
744 |
|
|
u_char ul_name[APPLEUFS_MAX_LABEL_NAME]; /* Warning: may not be null terminated */
|
745 |
|
|
u_int16_t ul_unused1;
|
746 |
|
|
u_int64_t ul_uuid; /* Note this is only 4 byte aligned */
|
747 |
|
|
u_char ul_reserved[24];
|
748 |
|
|
u_char ul_unused[460];
|
749 |
|
|
} __packed;
|
750 |
|
|
|
751 |
|
|
|
752 |
|
|
#endif /* !_UFS_FFS_FS_H_ */
|