minixfs3.h revision 1.5
1 /* $NetBSD: minixfs3.h,v 1.5 2013/06/23 07:28:36 dholland Exp $ */ 2 3 /*- 4 * Copyright (c) 2012 5 * Vrije Universiteit, Amsterdam, The Netherlands. All rights reserved. 6 * 7 * Author: Evgeniy Ivanov 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS 19 * IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, 20 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 21 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS BE 22 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 23 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 24 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 25 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 26 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 27 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 28 * POSSIBILITY OF SUCH DAMAGE. 29 */ 30 31 #ifndef MINIX_FS_3_H 32 #define MINIX_FS_3_H 33 34 FS_DEF(minixfs3); 35 36 typedef uint32_t zone_t; 37 typedef uint16_t zone1_t; 38 typedef uint32_t block_t; 39 40 #define NR_DZONES 7 /* # direct zone numbers in an inode */ 41 #define NR_TZONES 10 /* total # zone numbers in an inode */ 42 #define NIADDR 2 /* Indirect addresses in inode */ 43 44 struct mfs_dinode { 45 uint16_t mdi_mode; /* file type, protection, etc. */ 46 uint16_t mdi_nlinks; /* how many links to this file */ 47 int16_t mdi_uid; /* user id of the file's owner */ 48 uint16_t mdi_gid; /* group number */ 49 uint32_t mdi_size; /* current file size in bytes */ 50 uint32_t mdi_atime; /* time of last access */ 51 uint32_t mdi_mtime; /* when was file data last changed */ 52 uint32_t mdi_ctime; /* when was inode itself changed */ 53 zone_t mdi_zone[NR_TZONES]; /* zone numbers for direct, ind, and 54 dbl ind */ 55 }; 56 57 /* Maximum Minix MFS on-disk directory filename. 58 * MFS uses 'struct direct' to write and parse 59 * directory entries, so this can't be changed 60 * without breaking filesystems. 61 */ 62 #define MFS_DIRSIZ 60 63 64 struct mfs_direct { 65 uint32_t mfsd_ino; 66 char mfsd_name[MFS_DIRSIZ]; 67 } __packed; 68 69 struct mfs_sblock { 70 uint32_t mfs_ninodes; /* # usable inodes on the minor device */ 71 zone1_t mfs_nzones; /* total device size, including bit maps etc */ 72 int16_t mfs_imap_blocks; /* # of blocks used by inode bit map */ 73 int16_t mfs_zmap_blocks; /* # of blocks used by zone bit map */ 74 zone1_t mfs_firstdatazone_old;/* number of first data zone (small) */ 75 int16_t mfs_log_zone_size; /* log2 of blocks/zone */ 76 int16_t mfs_pad; /* try to avoid compiler-dependent padding */ 77 int32_t mfs_max_size; /* maximum file size on this device */ 78 zone_t mfs_zones; /* number of zones (replaces s_nzones in V2) */ 79 int16_t mfs_magic; /* magic number to recognize super-blocks */ 80 int16_t mfs_pad2; /* try to avoid compiler-dependent padding */ 81 uint16_t mfs_block_size; /* block size in bytes. */ 82 char mfs_disk_version; /* filesystem format sub-version */ 83 84 /* The following items are only used when the super_block is in memory, 85 * mfs_inodes_per_block must be the firs one (see SBSIZE) 86 */ 87 unsigned mfs_inodes_per_block; /* precalculated from magic number */ 88 zone_t mfs_firstdatazone; /* number of first data zone (big) */ 89 int32_t mfs_bshift; /* ``lblkno'' calc of logical blkno */ 90 int32_t mfs_bmask; /* ``blkoff'' calc of blk offsets */ 91 int64_t mfs_qbmask; /* ~fs_bmask - for use with quad size */ 92 int32_t mfs_fsbtodb; /* fsbtodb and dbtofsb shift constant */ 93 }; 94 95 #define LOG_MINBSIZE 10 96 #define MINBSIZE (1 << LOG_MINBSIZE) 97 98 #define SUPER_MAGIC 0x4d5a /* magic # for MFSv3 file systems */ 99 100 #define ROOT_INODE ((uint32_t) 1) /* inode number for root directory */ 101 #define SUPER_BLOCK_OFF (1024) /* bytes offset */ 102 #define START_BLOCK ((block_t) 2) /* first fs block (not counting SB) */ 103 104 /* # bytes/dir entry */ 105 #define DIR_ENTRY_SIZE sizeof(struct mfs_direct) 106 /* # dir entries/blk */ 107 #define NR_DIR_ENTRIES(fs) ((fs)->mfs_block_size/DIR_ENTRY_SIZE) 108 /* mfs_sblock on-disk part size */ 109 #define SBSIZE offsetof(struct mfs_sblock, mfs_inodes_per_block) 110 111 #define ZONE_NUM_SIZE sizeof(zone_t) /* # bytes in zone */ 112 #define INODE_SIZE sizeof(struct mfs_dinode) /* bytes in dsk ino */ 113 /* # zones/indir block */ 114 #define MFS_NINDIR(fs) ((fs)->mfs_block_size/ZONE_NUM_SIZE) 115 116 #define NO_ZONE ((zone_t) 0) /* absence of a zone number */ 117 #define NO_BLOCK ((block_t) 0) /* absence of a block number */ 118 119 /* Turn file system block numbers into disk block addresses */ 120 #define MFS_FSBTODB(fs, b) ((b) << (fs)->mfs_fsbtodb) 121 122 #define ino_to_fsba(fs, x) \ 123 (((x) - 1) / (fs)->mfs_inodes_per_block + \ 124 START_BLOCK + (fs)->mfs_imap_blocks + (fs)->mfs_zmap_blocks) 125 #define ino_to_fsbo(fs, x) (((x) - 1) % (fs)->mfs_inodes_per_block) 126 127 /* 128 * MFS metadatas are stored in little-endian byte order. These macros 129 * helps reading theses metadatas. 130 */ 131 #if BYTE_ORDER == LITTLE_ENDIAN 132 # define fs2h16(x) (x) 133 # define fs2h32(x) (x) 134 # define mfs_sbload(old, new) \ 135 memcpy((new), (old), SBSIZE); 136 # define mfs_iload(old, new) \ 137 memcpy((new),(old),sizeof(struct mfs_dinode)) 138 #else 139 void minixfs3_sb_bswap(struct mfs_sblock *, struct mfs_sblock *); 140 void minixfs3_i_bswap(struct mfs_dinode *, struct mfs_dinode *); 141 # define fs2h16(x) bswap16(x) 142 # define fs2h32(x) bswap32(x) 143 # define mfs_sbload(old, new) minixfs3_sb_bswap((old), (new)) 144 # define mfs_iload(old, new) minixfs3_i_bswap((old), (new)) 145 #endif /* BYTE_ORDER == LITTLE_ENDIAN */ 146 147 /* 148 * The following macros optimize certain frequently calculated 149 * quantities by using shifts and masks in place of divisions 150 * modulos and multiplications. 151 */ 152 #define mfs_blkoff(fs, loc) /* calculates (loc % fs->mfs_bsize) */ \ 153 ((loc) & (fs)->mfs_qbmask) 154 #define mfs_lblkno(fs, loc) /* calculates (loc / fs->mfs_bsize) */ \ 155 ((loc) >> (fs)->mfs_bshift) 156 157 /* Flag bits for i_mode in the inode. */ 158 #define I_TYPE 0170000 /* this field gives inode type */ 159 #define I_UNIX_SOCKET 0140000 /* unix domain socket */ 160 #define I_SYMBOLIC_LINK 0120000 /* file is a symbolic link */ 161 #define I_REGULAR 0100000 /* regular file, not dir or special */ 162 #define I_BLOCK_SPECIAL 0060000 /* block special file */ 163 #define I_DIRECTORY 0040000 /* file is a directory */ 164 #define I_CHAR_SPECIAL 0020000 /* character special file */ 165 #define I_NAMED_PIPE 0010000 /* named pipe (FIFO) */ 166 #define I_SET_UID_BIT 0004000 /* set effective uid_t on exec */ 167 #define I_SET_GID_BIT 0002000 /* set effective gid_t on exec */ 168 #define I_SET_STCKY_BIT 0001000 /* sticky bit */ 169 #define ALL_MODES 0007777 /* all bits for user, group and others */ 170 #define RWX_MODES 0000777 /* mode bits for RWX only */ 171 #define R_BIT 0000004 /* Rwx protection bit */ 172 #define W_BIT 0000002 /* rWx protection bit */ 173 #define X_BIT 0000001 /* rwX protection bit */ 174 #define I_NOT_ALLOC 0000000 /* this inode is free */ 175 176 #endif /* MINIX_FS_3_H */ 177
Indexes created Wed Sep 24 05:09:52 GMT 2025