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| 1 | 13 | up20180614 | /* $NetBSD: fs.h,v 1.66 2015/02/14 09:06:11 maxv Exp $ */
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| 2 | |||
| 3 | /*
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| 4 | * Copyright (c) 1982, 1986, 1993
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| 5 | * The Regents of the University of California. All rights reserved.
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| 6 | *
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| 7 | * Redistribution and use in source and binary forms, with or without
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| 8 | * modification, are permitted provided that the following conditions
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| 9 | * are met:
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| 10 | * 1. Redistributions of source code must retain the above copyright
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| 11 | * notice, this list of conditions and the following disclaimer.
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| 12 | * 2. Redistributions in binary form must reproduce the above copyright
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| 13 | * notice, this list of conditions and the following disclaimer in the
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| 14 | * documentation and/or other materials provided with the distribution.
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| 15 | * 3. Neither the name of the University nor the names of its contributors
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| 16 | * may be used to endorse or promote products derived from this software
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| 17 | * without specific prior written permission.
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| 18 | *
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| 19 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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| 20 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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| 21 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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| 22 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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| 23 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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| 24 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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| 25 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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| 26 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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| 27 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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| 28 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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| 29 | * SUCH DAMAGE.
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| 30 | *
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| 31 | * @(#)fs.h 8.13 (Berkeley) 3/21/95
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| 32 | */
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| 33 | |||
| 34 | /*
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| 35 | * NOTE: COORDINATE ON-DISK FORMAT CHANGES WITH THE FREEBSD PROJECT.
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| 36 | */
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| 37 | |||
| 38 | #ifndef _UFS_FFS_FS_H_
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| 39 | #define _UFS_FFS_FS_H_
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| 40 | |||
| 41 | /*
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| 42 | * Each disk drive contains some number of file systems.
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| 43 | * A file system consists of a number of cylinder groups.
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| 44 | * Each cylinder group has inodes and data.
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| 45 | *
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| 46 | * A file system is described by its super-block, which in turn
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| 47 | * describes the cylinder groups. The super-block is critical
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| 48 | * data and is replicated in each cylinder group to protect against
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| 49 | * catastrophic loss. This is done at `newfs' time and the critical
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| 50 | * super-block data does not change, so the copies need not be
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| 51 | * referenced further unless disaster strikes.
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| 52 | *
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| 53 | * For file system fs, the offsets of the various blocks of interest
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| 54 | * are given in the super block as:
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| 55 | * [fs->fs_sblkno] Super-block
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| 56 | * [fs->fs_cblkno] Cylinder group block
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| 57 | * [fs->fs_iblkno] Inode blocks
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| 58 | * [fs->fs_dblkno] Data blocks
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| 59 | * The beginning of cylinder group cg in fs, is given by
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| 60 | * the ``cgbase(fs, cg)'' macro.
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| 61 | *
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| 62 | * Depending on the architecture and the media, the superblock may
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| 63 | * reside in any one of four places. For tiny media where every block
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| 64 | * counts, it is placed at the very front of the partition. Historically,
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| 65 | * UFS1 placed it 8K from the front to leave room for the disk label and
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| 66 | * a small bootstrap. For UFS2 it got moved to 64K from the front to leave
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| 67 | * room for the disk label and a bigger bootstrap, and for really piggy
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| 68 | * systems we check at 256K from the front if the first three fail. In
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| 69 | * all cases the size of the superblock will be SBLOCKSIZE. All values are
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| 70 | * given in byte-offset form, so they do not imply a sector size. The
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| 71 | * SBLOCKSEARCH specifies the order in which the locations should be searched.
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| 72 | *
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| 73 | * Unfortunately the UFS2/FFSv2 change was done without adequate consideration
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| 74 | * of backward compatibility. In particular 'newfs' for a FFSv2 partition
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| 75 | * must overwrite any old FFSv1 superblock at 8k, and preferably as many
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| 76 | * of the alternates as it can find - otherwise attempting to mount on a
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| 77 | * system that only supports FFSv1 is likely to succeed!.
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| 78 | * For a small FFSv1 filesystem, an old FFSv2 superblock can be left on
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| 79 | * the disk, and a system that tries to find an FFSv2 filesystem in preference
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| 80 | * to and FFSv1 one (as NetBSD does) can mount the old FFSv2 filesystem.
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| 81 | * As a added bonus, the 'first alternate' superblock of a FFSv1 filesystem
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| 82 | * with 64k blocks is at 64k - just where the code looks first when playing
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| 83 | * 'hunt the superblock'.
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| 84 | *
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| 85 | * The ffsv2 superblock layout (which might contain an ffsv1 filesystem)
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| 86 | * can be detected by checking for sb->fs_old_flags & FS_FLAGS_UPDATED.
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| 87 | * This is the default superblock type for NetBSD since ffsv2 support was added.
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| 88 | */
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| 89 | #define BBSIZE 8192 |
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| 90 | #define BBOFF ((off_t)(0)) |
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| 91 | #define BBLOCK ((daddr_t)(0)) |
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| 92 | |||
| 93 | #define SBLOCK_FLOPPY 0 |
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| 94 | #define SBLOCK_UFS1 8192 |
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| 95 | #define SBLOCK_UFS2 65536 |
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| 96 | #define SBLOCK_PIGGY 262144 |
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| 97 | #define SBLOCKSIZE 8192 |
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| 98 | /*
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| 99 | * NB: Do not, under any circumstances, look for an ffsv1 filesystem at
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| 100 | * SBLOCK_UFS2. Doing so will find the wrong superblock for filesystems
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| 101 | * with a 64k block size.
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| 102 | */
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| 103 | #define SBLOCKSEARCH \
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| 104 | { SBLOCK_UFS2, SBLOCK_UFS1, SBLOCK_FLOPPY, SBLOCK_PIGGY, -1 }
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| 105 | |||
| 106 | /*
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| 107 | * Max number of fragments per block. This value is NOT tweakable.
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| 108 | */
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| 109 | #define MAXFRAG 8 |
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| 110 | |||
| 111 | |||
| 112 | |||
| 113 | /*
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| 114 | * Addresses stored in inodes are capable of addressing fragments
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| 115 | * of `blocks'. File system blocks of at most size MAXBSIZE can
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| 116 | * be optionally broken into 2, 4, or 8 pieces, each of which is
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| 117 | * addressable; these pieces may be DEV_BSIZE, or some multiple of
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| 118 | * a DEV_BSIZE unit.
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| 119 | *
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| 120 | * Large files consist of exclusively large data blocks. To avoid
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| 121 | * undue wasted disk space, the last data block of a small file may be
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| 122 | * allocated as only as many fragments of a large block as are
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| 123 | * necessary. The file system format retains only a single pointer
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| 124 | * to such a fragment, which is a piece of a single large block that
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| 125 | * has been divided. The size of such a fragment is determinable from
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| 126 | * information in the inode, using the ``ffs_blksize(fs, ip, lbn)'' macro.
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| 127 | *
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| 128 | * The file system records space availability at the fragment level;
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| 129 | * to determine block availability, aligned fragments are examined.
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| 130 | */
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| 131 | |||
| 132 | /*
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| 133 | * MINBSIZE is the smallest allowable block size.
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| 134 | * In order to insure that it is possible to create files of size
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| 135 | * 2^32 with only two levels of indirection, MINBSIZE is set to 4096.
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| 136 | * MINBSIZE must be big enough to hold a cylinder group block,
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| 137 | * thus changes to (struct cg) must keep its size within MINBSIZE.
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| 138 | * Note that super blocks are always of size SBSIZE,
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| 139 | * and that both SBSIZE and MAXBSIZE must be >= MINBSIZE.
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| 140 | */
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| 141 | #define MINBSIZE 4096 |
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| 142 | |||
| 143 | /*
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| 144 | * The path name on which the file system is mounted is maintained
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| 145 | * in fs_fsmnt. MAXMNTLEN defines the amount of space allocated in
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| 146 | * the super block for this name.
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| 147 | */
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| 148 | #define MAXMNTLEN 468 |
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| 149 | |||
| 150 | /*
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| 151 | * The volume name for this filesystem is maintained in fs_volname.
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| 152 | * MAXVOLLEN defines the length of the buffer allocated.
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| 153 | * This space used to be part of of fs_fsmnt.
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| 154 | */
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| 155 | #define MAXVOLLEN 32 |
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| 156 | |||
| 157 | /*
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| 158 | * There is a 128-byte region in the superblock reserved for in-core
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| 159 | * pointers to summary information. Originally this included an array
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| 160 | * of pointers to blocks of struct csum; now there are just four
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| 161 | * pointers and the remaining space is padded with fs_ocsp[].
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| 162 | * NOCSPTRS determines the size of this padding. One pointer (fs_csp)
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| 163 | * is taken away to point to a contiguous array of struct csum for
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| 164 | * all cylinder groups; a second (fs_maxcluster) points to an array
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| 165 | * of cluster sizes that is computed as cylinder groups are inspected;
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| 166 | * the third (fs_contigdirs) points to an array that tracks the
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| 167 | * creation of new directories; and the fourth (fs_active) is used
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| 168 | * by snapshots.
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| 169 | */
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| 170 | #define NOCSPTRS ((128 / sizeof(void *)) - 4) |
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| 171 | |||
| 172 | /*
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| 173 | * A summary of contiguous blocks of various sizes is maintained
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| 174 | * in each cylinder group. Normally this is set by the initial
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| 175 | * value of fs_maxcontig. To conserve space, a maximum summary size
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| 176 | * is set by FS_MAXCONTIG.
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| 177 | */
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| 178 | #define FS_MAXCONTIG 16 |
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| 179 | |||
| 180 | /*
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| 181 | * The maximum number of snapshot nodes that can be associated
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| 182 | * with each filesystem. This limit affects only the number of
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| 183 | * snapshot files that can be recorded within the superblock so
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| 184 | * that they can be found when the filesystem is mounted. However,
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| 185 | * maintaining too many will slow the filesystem performance, so
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| 186 | * having this limit is a good idea.
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| 187 | */
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| 188 | #define FSMAXSNAP 20 |
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| 189 | |||
| 190 | /*
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| 191 | * Used to identify special blocks in snapshots:
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| 192 | *
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| 193 | * BLK_NOCOPY - A block that was unallocated at the time the snapshot
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| 194 | * was taken, hence does not need to be copied when written.
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| 195 | * BLK_SNAP - A block held by another snapshot that is not needed by this
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| 196 | * snapshot. When the other snapshot is freed, the BLK_SNAP entries
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| 197 | * are converted to BLK_NOCOPY. These are needed to allow fsck to
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| 198 | * identify blocks that are in use by other snapshots (which are
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| 199 | * expunged from this snapshot).
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| 200 | */
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| 201 | #define BLK_NOCOPY ((daddr_t)(1)) |
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| 202 | #define BLK_SNAP ((daddr_t)(2)) |
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| 203 | |||
| 204 | /*
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| 205 | * MINFREE gives the minimum acceptable percentage of file system
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| 206 | * blocks which may be free. If the freelist drops below this level
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| 207 | * only the superuser may continue to allocate blocks. This may
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| 208 | * be set to 0 if no reserve of free blocks is deemed necessary,
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| 209 | * however throughput drops by fifty percent if the file system
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| 210 | * is run at between 95% and 100% full; thus the minimum default
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| 211 | * value of fs_minfree is 5%. However, to get good clustering
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| 212 | * performance, 10% is a better choice. This value is used only
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| 213 | * when creating a file system and can be overridden from the
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| 214 | * command line. By default we choose to optimize for time.
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| 215 | */
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| 216 | #define MINFREE 5 |
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| 217 | #define DEFAULTOPT FS_OPTTIME
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| 218 | |||
| 219 | /*
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| 220 | * Grigoriy Orlov <gluk@ptci.ru> has done some extensive work to fine
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| 221 | * tune the layout preferences for directories within a filesystem.
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| 222 | * His algorithm can be tuned by adjusting the following parameters
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| 223 | * which tell the system the average file size and the average number
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| 224 | * of files per directory. These defaults are well selected for typical
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| 225 | * filesystems, but may need to be tuned for odd cases like filesystems
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| 226 | * being used for squid caches or news spools.
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| 227 | */
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| 228 | #define AVFILESIZ 16384 /* expected average file size */ |
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| 229 | #define AFPDIR 64 /* expected number of files per directory */ |
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| 230 | |||
| 231 | /*
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| 232 | * Per cylinder group information; summarized in blocks allocated
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| 233 | * from first cylinder group data blocks. These blocks have to be
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| 234 | * read in from fs_csaddr (size fs_cssize) in addition to the
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| 235 | * super block.
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| 236 | */
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| 237 | struct csum {
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| 238 | int32_t cs_ndir; /* number of directories */
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| 239 | int32_t cs_nbfree; /* number of free blocks */
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| 240 | int32_t cs_nifree; /* number of free inodes */
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| 241 | int32_t cs_nffree; /* number of free frags */
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| 242 | }; |
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| 243 | |||
| 244 | struct csum_total {
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| 245 | int64_t cs_ndir; /* number of directories */
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| 246 | int64_t cs_nbfree; /* number of free blocks */
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| 247 | int64_t cs_nifree; /* number of free inodes */
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| 248 | int64_t cs_nffree; /* number of free frags */
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| 249 | int64_t cs_spare[4]; /* future expansion */ |
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| 250 | }; |
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| 251 | |||
| 252 | |||
| 253 | /*
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| 254 | * Super block for an FFS file system in memory.
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| 255 | */
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| 256 | struct fs {
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| 257 | int32_t fs_firstfield; /* historic file system linked list, */
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| 258 | int32_t fs_unused_1; /* used for incore super blocks */
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| 259 | int32_t fs_sblkno; /* addr of super-block in filesys */
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| 260 | int32_t fs_cblkno; /* offset of cyl-block in filesys */
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| 261 | int32_t fs_iblkno; /* offset of inode-blocks in filesys */
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| 262 | int32_t fs_dblkno; /* offset of first data after cg */
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| 263 | int32_t fs_old_cgoffset; /* cylinder group offset in cylinder */
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| 264 | int32_t fs_old_cgmask; /* used to calc mod fs_ntrak */
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| 265 | int32_t fs_old_time; /* last time written */
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| 266 | int32_t fs_old_size; /* number of blocks in fs */
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| 267 | int32_t fs_old_dsize; /* number of data blocks in fs */
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| 268 | int32_t fs_ncg; /* number of cylinder groups */
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| 269 | int32_t fs_bsize; /* size of basic blocks in fs */
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| 270 | int32_t fs_fsize; /* size of frag blocks in fs */
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| 271 | int32_t fs_frag; /* number of frags in a block in fs */
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| 272 | /* these are configuration parameters */
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| 273 | int32_t fs_minfree; /* minimum percentage of free blocks */
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| 274 | int32_t fs_old_rotdelay; /* num of ms for optimal next block */
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| 275 | int32_t fs_old_rps; /* disk revolutions per second */
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| 276 | /* these fields can be computed from the others */
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| 277 | int32_t fs_bmask; /* ``blkoff'' calc of blk offsets */
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| 278 | int32_t fs_fmask; /* ``fragoff'' calc of frag offsets */
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| 279 | int32_t fs_bshift; /* ``lblkno'' calc of logical blkno */
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| 280 | int32_t fs_fshift; /* ``numfrags'' calc number of frags */
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| 281 | /* these are configuration parameters */
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| 282 | int32_t fs_maxcontig; /* max number of contiguous blks */
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| 283 | int32_t fs_maxbpg; /* max number of blks per cyl group */
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| 284 | /* these fields can be computed from the others */
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| 285 | int32_t fs_fragshift; /* block to frag shift */
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| 286 | int32_t fs_fsbtodb; /* fsbtodb and dbtofsb shift constant */
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| 287 | int32_t fs_sbsize; /* actual size of super block */
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| 288 | int32_t fs_spare1[2]; /* old fs_csmask */ |
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| 289 | /* old fs_csshift */
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| 290 | int32_t fs_nindir; /* value of FFS_NINDIR */
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| 291 | int32_t fs_inopb; /* value of FFS_INOPB */
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| 292 | int32_t fs_old_nspf; /* value of NSPF */
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| 293 | /* yet another configuration parameter */
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| 294 | int32_t fs_optim; /* optimization preference, see below */
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| 295 | /* these fields are derived from the hardware */
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| 296 | int32_t fs_old_npsect; /* # sectors/track including spares */
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| 297 | int32_t fs_old_interleave; /* hardware sector interleave */
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| 298 | int32_t fs_old_trackskew; /* sector 0 skew, per track */
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| 299 | /* fs_id takes the space of the unused fs_headswitch and fs_trkseek fields */
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| 300 | int32_t fs_id[2]; /* unique file system id */ |
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| 301 | /* sizes determined by number of cylinder groups and their sizes */
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| 302 | int32_t fs_old_csaddr; /* blk addr of cyl grp summary area */
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| 303 | int32_t fs_cssize; /* size of cyl grp summary area */
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| 304 | int32_t fs_cgsize; /* cylinder group size */
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| 305 | /* these fields are derived from the hardware */
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| 306 | int32_t fs_spare2; /* old fs_ntrak */
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| 307 | int32_t fs_old_nsect; /* sectors per track */
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| 308 | int32_t fs_old_spc; /* sectors per cylinder */
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| 309 | int32_t fs_old_ncyl; /* cylinders in file system */
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| 310 | int32_t fs_old_cpg; /* cylinders per group */
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| 311 | int32_t fs_ipg; /* inodes per group */
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| 312 | int32_t fs_fpg; /* blocks per group * fs_frag */
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| 313 | /* this data must be re-computed after crashes */
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| 314 | struct csum fs_old_cstotal; /* cylinder summary information */ |
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| 315 | /* these fields are cleared at mount time */
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| 316 | int8_t fs_fmod; /* super block modified flag */
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| 317 | uint8_t fs_clean; /* file system is clean flag */
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| 318 | int8_t fs_ronly; /* mounted read-only flag */
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| 319 | uint8_t fs_old_flags; /* see FS_ flags below */
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| 320 | u_char fs_fsmnt[MAXMNTLEN]; /* name mounted on */
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| 321 | u_char fs_volname[MAXVOLLEN]; /* volume name */
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| 322 | uint64_t fs_swuid; /* system-wide uid */
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| 323 | int32_t fs_pad; |
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| 324 | /* these fields retain the current block allocation info */
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| 325 | int32_t fs_cgrotor; /* last cg searched (UNUSED) */
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| 326 | void *fs_ocsp[NOCSPTRS]; /* padding; was list of fs_cs buffers */ |
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| 327 | u_int8_t *fs_contigdirs; /* # of contiguously allocated dirs */
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| 328 | struct csum *fs_csp; /* cg summary info buffer for fs_cs */ |
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| 329 | int32_t *fs_maxcluster; /* max cluster in each cyl group */
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| 330 | u_char *fs_active; /* used by snapshots to track fs */
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| 331 | int32_t fs_old_cpc; /* cyl per cycle in postbl */
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| 332 | /* this area is otherwise allocated unless fs_old_flags & FS_FLAGS_UPDATED */
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| 333 | int32_t fs_maxbsize; /* maximum blocking factor permitted */
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| 334 | uint8_t fs_journal_version; /* journal format version */
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| 335 | uint8_t fs_journal_location; /* journal location type */
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| 336 | uint8_t fs_journal_reserved[2];/* reserved for future use */ |
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| 337 | uint32_t fs_journal_flags; /* journal flags */
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| 338 | uint64_t fs_journallocs[4]; /* location info for journal */ |
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| 339 | uint32_t fs_quota_magic; /* see quota2.h */
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| 340 | uint8_t fs_quota_flags; /* see quota2.h */
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| 341 | uint8_t fs_quota_reserved[3];
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| 342 | uint64_t fs_quotafile[2]; /* pointer to quota inodes */ |
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| 343 | int64_t fs_sparecon64[9]; /* reserved for future use */ |
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| 344 | int64_t fs_sblockloc; /* byte offset of standard superblock */
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| 345 | struct csum_total fs_cstotal; /* cylinder summary information */ |
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| 346 | int64_t fs_time; /* last time written */
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| 347 | int64_t fs_size; /* number of blocks in fs */
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| 348 | int64_t fs_dsize; /* number of data blocks in fs */
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| 349 | int64_t fs_csaddr; /* blk addr of cyl grp summary area */
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| 350 | int64_t fs_pendingblocks; /* blocks in process of being freed */
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| 351 | int32_t fs_pendinginodes; /* inodes in process of being freed */
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| 352 | int32_t fs_snapinum[FSMAXSNAP];/* list of snapshot inode numbers */
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| 353 | /* back to stuff that has been around a while */
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| 354 | int32_t fs_avgfilesize; /* expected average file size */
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| 355 | int32_t fs_avgfpdir; /* expected # of files per directory */
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| 356 | int32_t fs_save_cgsize; /* save real cg size to use fs_bsize */
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| 357 | int32_t fs_sparecon32[26]; /* reserved for future constants */ |
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| 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_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) |
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| 687 | #define ffs_fragstoblks(fs, frags) /* calculates (frags / fs->fs_frag) */ \ |
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| 688 | ((frags) >> (fs)->fs_fragshift) |
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| 689 | #define ffs_blkstofrags(fs, blks) /* calculates (blks * fs->fs_frag) */ \ |
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| 690 | ((blks) << (fs)->fs_fragshift) |
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| 691 | #define ffs_fragnum(fs, fsb) /* calculates (fsb % fs->fs_frag) */ \ |
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| 692 | ((fsb) & ((fs)->fs_frag - 1))
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| 693 | #define ffs_blknum(fs, fsb) /* calculates rounddown(fsb, fs->fs_frag) */ \ |
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| 694 | ((fsb) &~ ((fs)->fs_frag - 1))
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| 695 | |||
| 696 | /*
|
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| 697 | * Determine the number of available frags given a
|
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| 698 | * percentage to hold in reserve.
|
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| 699 | */
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| 700 | #define freespace(fs, percentreserved) \
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| 701 | (ffs_blkstofrags((fs), (fs)->fs_cstotal.cs_nbfree) + \ |
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| 702 | (fs)->fs_cstotal.cs_nffree - \ |
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| 703 | (((off_t)((fs)->fs_dsize)) * (percentreserved) / 100))
|
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| 704 | |||
| 705 | /*
|
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| 706 | * Determining the size of a file block in the file system.
|
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| 707 | */
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| 708 | #define ffs_blksize(fs, ip, lbn) \
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| 709 | (((lbn) >= UFS_NDADDR || (ip)->i_size >= ffs_lblktosize(fs, (lbn) + 1)) \
|
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| 710 | ? (fs)->fs_bsize \ |
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| 711 | : ((int32_t)ffs_fragroundup(fs, ffs_blkoff(fs, (ip)->i_size)))) |
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| 712 | |||
| 713 | #define ffs_sblksize(fs, size, lbn) \
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| 714 | (((lbn) >= UFS_NDADDR || (size) >= ((lbn) + 1) << (fs)->fs_bshift) \
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| 715 | ? (fs)->fs_bsize \ |
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| 716 | : ((int32_t)ffs_fragroundup(fs, ffs_blkoff(fs, (uint64_t)(size))))) |
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| 717 | |||
| 718 | |||
| 719 | /*
|
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| 720 | * Number of inodes in a secondary storage block/fragment.
|
||
| 721 | */
|
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| 722 | #define FFS_INOPB(fs) ((fs)->fs_inopb)
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| 723 | #define FFS_INOPF(fs) ((fs)->fs_inopb >> (fs)->fs_fragshift)
|
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| 724 | |||
| 725 | /*
|
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| 726 | * Number of indirects in a file system block.
|
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| 727 | */
|
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| 728 | #define FFS_NINDIR(fs) ((fs)->fs_nindir)
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| 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 */ |
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| 735 | #define APPLEUFS_LABEL_SIZE 1024 |
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| 736 | #define APPLEUFS_LABEL_OFFSET (BBSIZE - APPLEUFS_LABEL_SIZE) /* located at 7k */ |
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| 737 | #define APPLEUFS_LABEL_VERSION 1 |
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| 738 | #define APPLEUFS_MAX_LABEL_NAME 512 |
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| 739 | |||
| 740 | struct appleufslabel {
|
||
| 741 | u_int32_t ul_magic; |
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| 742 | u_int16_t ul_checksum; |
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| 743 | u_int16_t ul_unused0; |
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| 744 | u_int32_t ul_version; |
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| 745 | u_int32_t ul_time; |
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| 746 | u_int16_t ul_namelen; |
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| 747 | u_char ul_name[APPLEUFS_MAX_LABEL_NAME]; /* Warning: may not be null terminated */
|
||
| 748 | u_int16_t ul_unused1; |
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| 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; |
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| 753 | |||
| 754 | |||
| 755 | #endif /* !_UFS_FFS_FS_H_ */ |