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/* $NetBSD: fs.h,v 1.66 2015/02/14 09:06:11 maxv 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 preferably 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 ``ffs_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 overridden 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 FFS_NINDIR */
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int32_t fs_inopb; /* value of FFS_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 */
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int32_t fs_fpg; /* blocks per group * fs_frag */
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/* this data must be re-computed after crashes */
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struct csum fs_old_cstotal; /* cylinder summary information */ |
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/* these fields are cleared at mount time */
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int8_t fs_fmod; /* super block modified flag */
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uint8_t fs_clean; /* file system is clean flag */
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int8_t fs_ronly; /* mounted read-only flag */
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uint8_t fs_old_flags; /* see FS_ flags below */
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u_char fs_fsmnt[MAXMNTLEN]; /* name mounted on */
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u_char fs_volname[MAXVOLLEN]; /* volume name */
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uint64_t fs_swuid; /* system-wide uid */
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int32_t fs_pad; |
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/* these fields retain the current block allocation info */
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int32_t fs_cgrotor; /* last cg searched (UNUSED) */
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void *fs_ocsp[NOCSPTRS]; /* padding; was list of fs_cs buffers */ |
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u_int8_t *fs_contigdirs; /* # of contiguously allocated dirs */
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struct csum *fs_csp; /* cg summary info buffer for fs_cs */ |
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int32_t *fs_maxcluster; /* max cluster in each cyl group */
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u_char *fs_active; /* used by snapshots to track fs */
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int32_t fs_old_cpc; /* cyl per cycle in postbl */
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/* this area is otherwise allocated unless fs_old_flags & FS_FLAGS_UPDATED */
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int32_t fs_maxbsize; /* maximum blocking factor permitted */
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uint8_t fs_journal_version; /* journal format version */
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uint8_t fs_journal_location; /* journal location type */
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uint8_t fs_journal_reserved[2];/* reserved for future use */ |
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uint32_t fs_journal_flags; /* journal flags */
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uint64_t fs_journallocs[4]; /* location info for journal */ |
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uint32_t fs_quota_magic; /* see quota2.h */
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uint8_t fs_quota_flags; /* see quota2.h */
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uint8_t fs_quota_reserved[3];
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uint64_t fs_quotafile[2]; /* pointer to quota inodes */ |
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int64_t fs_sparecon64[9]; /* reserved for future use */ |
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int64_t fs_sblockloc; /* byte offset of standard superblock */
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struct csum_total fs_cstotal; /* cylinder summary information */ |
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int64_t fs_time; /* last time written */
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int64_t fs_size; /* number of blocks in fs */
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int64_t fs_dsize; /* number of data blocks in fs */
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int64_t fs_csaddr; /* blk addr of cyl grp summary area */
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int64_t fs_pendingblocks; /* blocks in process of being freed */
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int32_t fs_pendinginodes; /* inodes in process of being freed */
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int32_t fs_snapinum[FSMAXSNAP];/* list of snapshot inode numbers */
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/* back to stuff that has been around a while */
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int32_t fs_avgfilesize; /* expected average file size */
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int32_t fs_avgfpdir; /* expected # of files per directory */
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int32_t fs_save_cgsize; /* save real cg size to use fs_bsize */
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int32_t fs_sparecon32[26]; /* reserved for future constants */ |
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uint32_t fs_flags; /* see FS_ flags below */
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/* back to stuff that has been around a while (again) */
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int32_t fs_contigsumsize; /* size of cluster summary array */
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int32_t fs_maxsymlinklen; /* max length of an internal symlink */
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int32_t fs_old_inodefmt; /* format of on-disk inodes */
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u_int64_t fs_maxfilesize; /* maximum representable file size */
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int64_t fs_qbmask; /* ~fs_bmask for use with 64-bit size */
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int64_t fs_qfmask; /* ~fs_fmask for use with 64-bit size */
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int32_t fs_state; /* validate fs_clean field (UNUSED) */
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int32_t fs_old_postblformat; /* format of positional layout tables */
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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_SUJ 0x008 /* file system using journaled softupdates */ |
| 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 |
/* FS_NFS4ACLS 0x100 file system has NFSv4 ACLs enabled (FBSD) */
|
| 432 |
#define FS_DOQUOTA2 0x200 /* in-filesystem quotas */ |
| 433 |
/* FS_INDEXDIRS 0x200 kernel supports indexed directories (FBSD)*/
|
| 434 |
#define FS_TRIM 0x400 /* discard deleted blocks in storage layer */ |
| 435 |
|
| 436 |
/* File system flags that are ok for NetBSD if set in fs_flags */
|
| 437 |
#define FS_KNOWN_FLAGS (FS_DOSOFTDEP | FS_DOWAPBL | FS_DOQUOTA2)
|
| 438 |
|
| 439 |
/*
|
| 440 |
* File system internal flags, also in fs_flags.
|
| 441 |
* (Pick highest number to avoid conflicts with others)
|
| 442 |
*/
|
| 443 |
#define FS_SWAPPED 0x80000000 /* file system is endian swapped */ |
| 444 |
#define FS_INTERNAL 0x80000000 /* mask for internal flags */ |
| 445 |
|
| 446 |
/*
|
| 447 |
* Macros to access bits in the fs_active array.
|
| 448 |
*/
|
| 449 |
#define ACTIVECG_SET(fs, cg) \
|
| 450 |
do { \
|
| 451 |
if ((fs)->fs_active != NULL) \ |
| 452 |
setbit((fs)->fs_active, (cg)); \ |
| 453 |
} while (/*CONSTCOND*/ 0) |
| 454 |
#define ACTIVECG_CLR(fs, cg) \
|
| 455 |
do { \
|
| 456 |
if ((fs)->fs_active != NULL) \ |
| 457 |
clrbit((fs)->fs_active, (cg)); \ |
| 458 |
} while (/*CONSTCOND*/ 0) |
| 459 |
#define ACTIVECG_ISSET(fs, cg) \
|
| 460 |
((fs)->fs_active != NULL && isset((fs)->fs_active, (cg)))
|
| 461 |
|
| 462 |
/*
|
| 463 |
* The size of a cylinder group is calculated by CGSIZE. The maximum size
|
| 464 |
* is limited by the fact that cylinder groups are at most one block.
|
| 465 |
* Its size is derived from the size of the maps maintained in the
|
| 466 |
* cylinder group and the (struct cg) size.
|
| 467 |
*/
|
| 468 |
#define CGSIZE_IF(fs, ipg, fpg) \
|
| 469 |
/* base cg */ (sizeof(struct cg) + sizeof(int32_t) + \ |
| 470 |
/* old btotoff */ (fs)->fs_old_cpg * sizeof(int32_t) + \ |
| 471 |
/* old boff */ (fs)->fs_old_cpg * sizeof(u_int16_t) + \ |
| 472 |
/* inode map */ howmany((ipg), NBBY) + \
|
| 473 |
/* block map */ howmany((fpg), NBBY) +\
|
| 474 |
/* if present */ ((fs)->fs_contigsumsize <= 0 ? 0 : \ |
| 475 |
/* cluster sum */ (fs)->fs_contigsumsize * sizeof(int32_t) + \ |
| 476 |
/* cluster map */ howmany(ffs_fragstoblks(fs, (fpg)), NBBY)))
|
| 477 |
|
| 478 |
#define CGSIZE(fs) CGSIZE_IF((fs), (fs)->fs_ipg, (fs)->fs_fpg)
|
| 479 |
|
| 480 |
/*
|
| 481 |
* The minimal number of cylinder groups that should be created.
|
| 482 |
*/
|
| 483 |
#define MINCYLGRPS 4 |
| 484 |
|
| 485 |
|
| 486 |
/*
|
| 487 |
* Convert cylinder group to base address of its global summary info.
|
| 488 |
*/
|
| 489 |
#define fs_cs(fs, indx) fs_csp[indx]
|
| 490 |
|
| 491 |
/*
|
| 492 |
* Cylinder group block for a file system.
|
| 493 |
*/
|
| 494 |
#define CG_MAGIC 0x090255 |
| 495 |
struct cg {
|
| 496 |
int32_t cg_firstfield; /* historic cyl groups linked list */
|
| 497 |
int32_t cg_magic; /* magic number */
|
| 498 |
int32_t cg_old_time; /* time last written */
|
| 499 |
int32_t cg_cgx; /* we are the cgx'th cylinder group */
|
| 500 |
int16_t cg_old_ncyl; /* number of cyl's this cg */
|
| 501 |
int16_t cg_old_niblk; /* number of inode blocks this cg */
|
| 502 |
int32_t cg_ndblk; /* number of data blocks this cg */
|
| 503 |
struct csum cg_cs; /* cylinder summary information */ |
| 504 |
int32_t cg_rotor; /* position of last used block */
|
| 505 |
int32_t cg_frotor; /* position of last used frag */
|
| 506 |
int32_t cg_irotor; /* position of last used inode */
|
| 507 |
int32_t cg_frsum[MAXFRAG]; /* counts of available frags */
|
| 508 |
int32_t cg_old_btotoff; /* (int32) block totals per cylinder */
|
| 509 |
int32_t cg_old_boff; /* (u_int16) free block positions */
|
| 510 |
int32_t cg_iusedoff; /* (u_int8) used inode map */
|
| 511 |
int32_t cg_freeoff; /* (u_int8) free block map */
|
| 512 |
int32_t cg_nextfreeoff; /* (u_int8) next available space */
|
| 513 |
int32_t cg_clustersumoff; /* (u_int32) counts of avail clusters */
|
| 514 |
int32_t cg_clusteroff; /* (u_int8) free cluster map */
|
| 515 |
int32_t cg_nclusterblks; /* number of clusters this cg */
|
| 516 |
int32_t cg_niblk; /* number of inode blocks this cg */
|
| 517 |
int32_t cg_initediblk; /* last initialized inode */
|
| 518 |
int32_t cg_sparecon32[3]; /* reserved for future use */ |
| 519 |
int64_t cg_time; /* time last written */
|
| 520 |
int64_t cg_sparecon64[3]; /* reserved for future use */ |
| 521 |
u_int8_t cg_space[1]; /* space for cylinder group maps */ |
| 522 |
/* actually longer */
|
| 523 |
}; |
| 524 |
|
| 525 |
/*
|
| 526 |
* The following structure is defined
|
| 527 |
* for compatibility with old file systems.
|
| 528 |
*/
|
| 529 |
struct ocg {
|
| 530 |
int32_t cg_firstfield; /* historic linked list of cyl groups */
|
| 531 |
int32_t cg_unused_1; /* used for incore cyl groups */
|
| 532 |
int32_t cg_time; /* time last written */
|
| 533 |
int32_t cg_cgx; /* we are the cgx'th cylinder group */
|
| 534 |
int16_t cg_ncyl; /* number of cyl's this cg */
|
| 535 |
int16_t cg_niblk; /* number of inode blocks this cg */
|
| 536 |
int32_t cg_ndblk; /* number of data blocks this cg */
|
| 537 |
struct csum cg_cs; /* cylinder summary information */ |
| 538 |
int32_t cg_rotor; /* position of last used block */
|
| 539 |
int32_t cg_frotor; /* position of last used frag */
|
| 540 |
int32_t cg_irotor; /* position of last used inode */
|
| 541 |
int32_t cg_frsum[8]; /* counts of available frags */ |
| 542 |
int32_t cg_btot[32]; /* block totals per cylinder */ |
| 543 |
int16_t cg_b[32][8]; /* positions of free blocks */ |
| 544 |
u_int8_t cg_iused[256]; /* used inode map */ |
| 545 |
int32_t cg_magic; /* magic number */
|
| 546 |
u_int8_t cg_free[1]; /* free block map */ |
| 547 |
/* actually longer */
|
| 548 |
}; |
| 549 |
|
| 550 |
|
| 551 |
/*
|
| 552 |
* Macros for access to cylinder group array structures.
|
| 553 |
*/
|
| 554 |
#define old_cg_blktot_old(cgp, ns) \
|
| 555 |
(((struct ocg *)(cgp))->cg_btot)
|
| 556 |
#define old_cg_blks_old(fs, cgp, cylno, ns) \
|
| 557 |
(((struct ocg *)(cgp))->cg_b[cylno])
|
| 558 |
|
| 559 |
#define old_cg_blktot_new(cgp, ns) \
|
| 560 |
((int32_t *)((u_int8_t *)(cgp) + \ |
| 561 |
ufs_rw32((cgp)->cg_old_btotoff, (ns)))) |
| 562 |
#define old_cg_blks_new(fs, cgp, cylno, ns) \
|
| 563 |
((int16_t *)((u_int8_t *)(cgp) + \ |
| 564 |
ufs_rw32((cgp)->cg_old_boff, (ns))) + (cylno) * (fs)->fs_old_nrpos) |
| 565 |
|
| 566 |
#define old_cg_blktot(cgp, ns) \
|
| 567 |
((ufs_rw32((cgp)->cg_magic, (ns)) != CG_MAGIC) ? \ |
| 568 |
old_cg_blktot_old(cgp, ns) : old_cg_blktot_new(cgp, ns)) |
| 569 |
#define old_cg_blks(fs, cgp, cylno, ns) \
|
| 570 |
((ufs_rw32((cgp)->cg_magic, (ns)) != CG_MAGIC) ? \ |
| 571 |
old_cg_blks_old(fs, cgp, cylno, ns) : old_cg_blks_new(fs, cgp, cylno, ns)) |
| 572 |
|
| 573 |
#define cg_inosused_new(cgp, ns) \
|
| 574 |
((u_int8_t *)((u_int8_t *)(cgp) + \ |
| 575 |
ufs_rw32((cgp)->cg_iusedoff, (ns)))) |
| 576 |
#define cg_blksfree_new(cgp, ns) \
|
| 577 |
((u_int8_t *)((u_int8_t *)(cgp) + \ |
| 578 |
ufs_rw32((cgp)->cg_freeoff, (ns)))) |
| 579 |
#define cg_chkmagic_new(cgp, ns) \
|
| 580 |
(ufs_rw32((cgp)->cg_magic, (ns)) == CG_MAGIC) |
| 581 |
|
| 582 |
#define cg_inosused_old(cgp, ns) \
|
| 583 |
(((struct ocg *)(cgp))->cg_iused)
|
| 584 |
#define cg_blksfree_old(cgp, ns) \
|
| 585 |
(((struct ocg *)(cgp))->cg_free)
|
| 586 |
#define cg_chkmagic_old(cgp, ns) \
|
| 587 |
(ufs_rw32(((struct ocg *)(cgp))->cg_magic, (ns)) == CG_MAGIC)
|
| 588 |
|
| 589 |
#define cg_inosused(cgp, ns) \
|
| 590 |
((ufs_rw32((cgp)->cg_magic, (ns)) != CG_MAGIC) ? \ |
| 591 |
cg_inosused_old(cgp, ns) : cg_inosused_new(cgp, ns)) |
| 592 |
#define cg_blksfree(cgp, ns) \
|
| 593 |
((ufs_rw32((cgp)->cg_magic, (ns)) != CG_MAGIC) ? \ |
| 594 |
cg_blksfree_old(cgp, ns) : cg_blksfree_new(cgp, ns)) |
| 595 |
#define cg_chkmagic(cgp, ns) \
|
| 596 |
(cg_chkmagic_new(cgp, ns) || cg_chkmagic_old(cgp, ns)) |
| 597 |
|
| 598 |
#define cg_clustersfree(cgp, ns) \
|
| 599 |
((u_int8_t *)((u_int8_t *)(cgp) + \ |
| 600 |
ufs_rw32((cgp)->cg_clusteroff, (ns)))) |
| 601 |
#define cg_clustersum(cgp, ns) \
|
| 602 |
((int32_t *)((u_int8_t *)(cgp) + \ |
| 603 |
ufs_rw32((cgp)->cg_clustersumoff, (ns)))) |
| 604 |
|
| 605 |
|
| 606 |
/*
|
| 607 |
* Turn file system block numbers into disk block addresses.
|
| 608 |
* This maps file system blocks to device size blocks.
|
| 609 |
*/
|
| 610 |
#if defined (_KERNEL)
|
| 611 |
#define FFS_FSBTODB(fs, b) ((b) << ((fs)->fs_fshift - DEV_BSHIFT))
|
| 612 |
#define FFS_DBTOFSB(fs, b) ((b) >> ((fs)->fs_fshift - DEV_BSHIFT))
|
| 613 |
#else
|
| 614 |
#define FFS_FSBTODB(fs, b) ((b) << (fs)->fs_fsbtodb)
|
| 615 |
#define FFS_DBTOFSB(fs, b) ((b) >> (fs)->fs_fsbtodb)
|
| 616 |
#endif
|
| 617 |
|
| 618 |
/*
|
| 619 |
* Cylinder group macros to locate things in cylinder groups.
|
| 620 |
* They calc file system addresses of cylinder group data structures.
|
| 621 |
*/
|
| 622 |
#define cgbase(fs, c) (((daddr_t)(fs)->fs_fpg) * (c))
|
| 623 |
#define cgstart_ufs1(fs, c) \
|
| 624 |
(cgbase(fs, c) + (fs)->fs_old_cgoffset * ((c) & ~((fs)->fs_old_cgmask))) |
| 625 |
#define cgstart_ufs2(fs, c) cgbase((fs), (c))
|
| 626 |
#define cgstart(fs, c) ((fs)->fs_magic == FS_UFS2_MAGIC \
|
| 627 |
? cgstart_ufs2((fs), (c)) : cgstart_ufs1((fs), (c))) |
| 628 |
#define cgdmin(fs, c) (cgstart(fs, c) + (fs)->fs_dblkno) /* 1st data */ |
| 629 |
#define cgimin(fs, c) (cgstart(fs, c) + (fs)->fs_iblkno) /* inode blk */ |
| 630 |
#define cgsblock(fs, c) (cgstart(fs, c) + (fs)->fs_sblkno) /* super blk */ |
| 631 |
#define cgtod(fs, c) (cgstart(fs, c) + (fs)->fs_cblkno) /* cg block */ |
| 632 |
|
| 633 |
/*
|
| 634 |
* Macros for handling inode numbers:
|
| 635 |
* inode number to file system block offset.
|
| 636 |
* inode number to cylinder group number.
|
| 637 |
* inode number to file system block address.
|
| 638 |
*/
|
| 639 |
#define ino_to_cg(fs, x) ((x) / (fs)->fs_ipg)
|
| 640 |
#define ino_to_fsba(fs, x) \
|
| 641 |
((daddr_t)(cgimin(fs, ino_to_cg(fs, x)) + \ |
| 642 |
(ffs_blkstofrags((fs), (((x) % (fs)->fs_ipg) / FFS_INOPB(fs)))))) |
| 643 |
#define ino_to_fsbo(fs, x) ((x) % FFS_INOPB(fs))
|
| 644 |
|
| 645 |
/*
|
| 646 |
* Give cylinder group number for a file system block.
|
| 647 |
* Give cylinder group block number for a file system block.
|
| 648 |
*/
|
| 649 |
#define dtog(fs, d) ((d) / (fs)->fs_fpg)
|
| 650 |
#define dtogd(fs, d) ((d) % (fs)->fs_fpg)
|
| 651 |
|
| 652 |
/*
|
| 653 |
* Extract the bits for a block from a map.
|
| 654 |
* Compute the cylinder and rotational position of a cyl block addr.
|
| 655 |
*/
|
| 656 |
#define blkmap(fs, map, loc) \
|
| 657 |
(((map)[(loc) / NBBY] >> ((loc) % NBBY)) & (0xff >> (NBBY - (fs)->fs_frag)))
|
| 658 |
#define old_cbtocylno(fs, bno) \
|
| 659 |
(FFS_FSBTODB(fs, bno) / (fs)->fs_old_spc) |
| 660 |
#define old_cbtorpos(fs, bno) \
|
| 661 |
((fs)->fs_old_nrpos <= 1 ? 0 : \ |
| 662 |
(FFS_FSBTODB(fs, bno) % (fs)->fs_old_spc / (fs)->fs_old_nsect * (fs)->fs_old_trackskew + \ |
| 663 |
FFS_FSBTODB(fs, bno) % (fs)->fs_old_spc % (fs)->fs_old_nsect * (fs)->fs_old_interleave) % \ |
| 664 |
(fs)->fs_old_nsect * (fs)->fs_old_nrpos / (fs)->fs_old_npsect) |
| 665 |
|
| 666 |
/*
|
| 667 |
* The following macros optimize certain frequently calculated
|
| 668 |
* quantities by using shifts and masks in place of divisions
|
| 669 |
* modulos and multiplications.
|
| 670 |
*/
|
| 671 |
#define ffs_blkoff(fs, loc) /* calculates (loc % fs->fs_bsize) */ \ |
| 672 |
((loc) & (fs)->fs_qbmask) |
| 673 |
#define ffs_fragoff(fs, loc) /* calculates (loc % fs->fs_fsize) */ \ |
| 674 |
((loc) & (fs)->fs_qfmask) |
| 675 |
#define ffs_lfragtosize(fs, frag) /* calculates ((off_t)frag * fs->fs_fsize) */ \ |
| 676 |
(((off_t)(frag)) << (fs)->fs_fshift) |
| 677 |
#define ffs_lblktosize(fs, blk) /* calculates ((off_t)blk * fs->fs_bsize) */ \ |
| 678 |
((uint64_t)(((off_t)(blk)) << (fs)->fs_bshift)) |
| 679 |
#define ffs_lblkno(fs, loc) /* calculates (loc / fs->fs_bsize) */ \ |
| 680 |
((loc) >> (fs)->fs_bshift) |
| 681 |
#define ffs_numfrags(fs, loc) /* calculates (loc / fs->fs_fsize) */ \ |
| 682 |
((loc) >> (fs)->fs_fshift) |
| 683 |
#define ffs_blkroundup(fs, size) /* calculates roundup(size, fs->fs_bsize) */ \ |
| 684 |
(((size) + (fs)->fs_qbmask) & (fs)->fs_bmask) |
| 685 |
#define ffs_fragroundup(fs, size) /* calculates roundup(size, fs->fs_fsize) */ \ |
| 686 |
(((size) + (fs)->fs_qfmask) & (fs)->fs_fmask) |
| 687 |
#define ffs_fragstoblks(fs, frags) /* calculates (frags / fs->fs_frag) */ \ |
| 688 |
((frags) >> (fs)->fs_fragshift) |
| 689 |
#define ffs_blkstofrags(fs, blks) /* calculates (blks * fs->fs_frag) */ \ |
| 690 |
((blks) << (fs)->fs_fragshift) |
| 691 |
#define ffs_fragnum(fs, fsb) /* calculates (fsb % fs->fs_frag) */ \ |
| 692 |
((fsb) & ((fs)->fs_frag - 1))
|
| 693 |
#define ffs_blknum(fs, fsb) /* calculates rounddown(fsb, fs->fs_frag) */ \ |
| 694 |
((fsb) &~ ((fs)->fs_frag - 1))
|
| 695 |
|
| 696 |
/*
|
| 697 |
* Determine the number of available frags given a
|
| 698 |
* percentage to hold in reserve.
|
| 699 |
*/
|
| 700 |
#define freespace(fs, percentreserved) \
|
| 701 |
(ffs_blkstofrags((fs), (fs)->fs_cstotal.cs_nbfree) + \ |
| 702 |
(fs)->fs_cstotal.cs_nffree - \ |
| 703 |
(((off_t)((fs)->fs_dsize)) * (percentreserved) / 100))
|
| 704 |
|
| 705 |
/*
|
| 706 |
* Determining the size of a file block in the file system.
|
| 707 |
*/
|
| 708 |
#define ffs_blksize(fs, ip, lbn) \
|
| 709 |
(((lbn) >= UFS_NDADDR || (ip)->i_size >= ffs_lblktosize(fs, (lbn) + 1)) \
|
| 710 |
? (fs)->fs_bsize \ |
| 711 |
: ((int32_t)ffs_fragroundup(fs, ffs_blkoff(fs, (ip)->i_size)))) |
| 712 |
|
| 713 |
#define ffs_sblksize(fs, size, lbn) \
|
| 714 |
(((lbn) >= UFS_NDADDR || (size) >= ((lbn) + 1) << (fs)->fs_bshift) \
|
| 715 |
? (fs)->fs_bsize \ |
| 716 |
: ((int32_t)ffs_fragroundup(fs, ffs_blkoff(fs, (uint64_t)(size))))) |
| 717 |
|
| 718 |
|
| 719 |
/*
|
| 720 |
* Number of inodes in a secondary storage block/fragment.
|
| 721 |
*/
|
| 722 |
#define FFS_INOPB(fs) ((fs)->fs_inopb)
|
| 723 |
#define FFS_INOPF(fs) ((fs)->fs_inopb >> (fs)->fs_fragshift)
|
| 724 |
|
| 725 |
/*
|
| 726 |
* Number of indirects in a file system block.
|
| 727 |
*/
|
| 728 |
#define FFS_NINDIR(fs) ((fs)->fs_nindir)
|
| 729 |
|
| 730 |
/*
|
| 731 |
* Apple UFS Label:
|
| 732 |
* We check for this to decide to use APPLEUFS_DIRBLKSIZ
|
| 733 |
*/
|
| 734 |
#define APPLEUFS_LABEL_MAGIC 0x4c41424c /* LABL */ |
| 735 |
#define APPLEUFS_LABEL_SIZE 1024 |
| 736 |
#define APPLEUFS_LABEL_OFFSET (BBSIZE - APPLEUFS_LABEL_SIZE) /* located at 7k */ |
| 737 |
#define APPLEUFS_LABEL_VERSION 1 |
| 738 |
#define APPLEUFS_MAX_LABEL_NAME 512 |
| 739 |
|
| 740 |
struct appleufslabel {
|
| 741 |
u_int32_t ul_magic; |
| 742 |
u_int16_t ul_checksum; |
| 743 |
u_int16_t ul_unused0; |
| 744 |
u_int32_t ul_version; |
| 745 |
u_int32_t ul_time; |
| 746 |
u_int16_t ul_namelen; |
| 747 |
u_char ul_name[APPLEUFS_MAX_LABEL_NAME]; /* Warning: may not be null terminated */
|
| 748 |
u_int16_t ul_unused1; |
| 749 |
u_int64_t ul_uuid; /* Note this is only 4 byte aligned */
|
| 750 |
u_char ul_reserved[24];
|
| 751 |
u_char ul_unused[460];
|
| 752 |
} __packed; |
| 753 |
|
| 754 |
|
| 755 |
#endif /* !_UFS_FFS_FS_H_ */ |