/filesystems/unixfs/ancientfs/ancientfs_2.9bsd.h
C++ Header | 171 lines | 127 code | 20 blank | 24 comment | 5 complexity | 2b968169f22950e82e73bde9596f3212 MD5 | raw file
1/* 2 * Ancient UNIX File Systems for MacFUSE 3 * Amit Singh 4 * http://osxbook.com 5 */ 6 7#ifndef _ANCIENTFS_29BSD_H_ 8#define _ANCIENTFS_29BSD_H_ 9 10#include "unixfs_internal.h" 11 12typedef int16_t a_short; /* ancient short */ 13typedef uint16_t a_ushort; /* ancient unsigned short */ 14typedef int16_t a_int; /* ancient int */ 15typedef uint16_t a_uint; /* ancient unsigned int */ 16typedef int32_t a_long; /* ancient long */ 17typedef uint32_t a_ulong; /* ancient unsigned long */ 18 19typedef a_uint a_ino_t; /* ancient inode type (ancient unsigned int) */ 20typedef a_long a_off_t; /* ancient offset type (ancient long) */ 21typedef a_long a_time_t; /* ancient time type (ancient long) */ 22typedef a_long a_daddr_t; /* ancient disk address type (ancient long) */ 23typedef a_int a_dev_t; /* ancient device type (ancient int) */ 24 25#define UCB_NKB 1 26 27#if UCB_NKB == 1 28#undef CLSIZE 29#define CLSIZE 2 /* number of blocks / cluster */ 30#define BSIZE 1024 /* size of secondary block (bytes) */ 31#define NINDIR (BSIZE/sizeof(a_daddr_t)) 32#define BMASK 01777 /* BSIZE - 1 */ 33#define BSHIFT 10 /* LOG2(BSIZE) */ 34#define NMASK 0377 /* NINDIR - 1 */ 35#define NSHIFT 8 /* LOG2(NINDIR) */ 36#else 37#define BSIZE 512 /* size of secondary block (bytes) */ 38#define NINDIR (BSIZE/sizeof(a_daddr_t)) 39#define BMASK 0777 /* BSIZE - 1 */ 40#define BSHIFT 9 /* LOG2(BSIZE) */ 41#define NMASK 0177 /* NINDIR - 1 */ 42#define NSHIFT 7 /* LOG2(NINDIR) */ 43#endif 44 45#define ROOTINO 2 /* i number of all roots */ 46#define DIRSIZ 14 /* max characters per directory */ 47#define NICINOD 100 /* number of super block inodes */ 48#define NICFREE 50 /* number of super block free blocks */ 49 50/* 51 * Definition of the unix super block. 52 */ 53struct filsys 54{ 55 a_ushort s_isize; /* size in blocks of i-list */ 56 a_daddr_t s_fsize; /* size in blocks of entire volume */ 57 a_short s_nfree; /* number of addresses in s_free */ 58 a_daddr_t s_free[NICFREE]; /* free block list */ 59 a_short s_ninode; /* number of i-nodes in s_inode */ 60 a_ino_t s_inode[NICINOD]; /* free i-node list */ 61 char s_flock; /* lock during free list manipulation */ 62 char s_ilock; /* lock during i-list manipulation */ 63 char s_fmod; /* super block modified flag */ 64 char s_ronly; /* mounted read-only flag */ 65 time_t s_time; /* last super block update */ 66 67 /* remainder not maintained by this version of the system */ 68 69 a_daddr_t s_tfree; /* total free blocks*/ 70 a_ino_t s_tinode; /* total free inodes */ 71 a_short s_dinfo[2]; /* interleave stuff */ 72#define s_m s_dinfo[0] 73#define s_n s_dinfo[1] 74 char s_fsmnt[12]; /* ordinary file mounted on */ 75 ino_t s_lasti; /* start place for circular search */ 76 ino_t s_nbehind; /* est # free inodes before s_lasti */ 77} __attribute__((packed)); 78 79/* 80 * Inode struct as it appears on a disk block. 81 */ 82struct dinode 83{ 84 a_ushort di_mode; /* mode and type of file */ 85 a_short di_nlink; /* number of links to file */ 86 a_short di_uid; /* owner's user id */ 87 a_short di_gid; /* owner's group id */ 88 a_off_t di_size; /* number of bytes in file */ 89 char di_addr[40]; /* disk block addresses */ 90 a_time_t di_atime; /* time last accessed */ 91 a_time_t di_mtime; /* time last modified */ 92 a_time_t di_ctime; /* time created */ 93} __attribute__((packed)); 94 95#if UCB_NKB == 1 96#define INOPB 16 /* 16 inodes per block */ 97/* 98 * 21 of the address bytes are used; 99 * 7 addresses of 3 bytes each. 100 */ 101#else 102#define INOPB 8 /* 8 inodes per block */ 103/* 104 * 39 of the address bytes are used; 105 * 13 addresses of 3 bytes each. 106 */ 107#endif 108 109/* inumber to disk address */ 110#if UCB_NKB == 1 111#define itod(x) ((a_daddr_t)((((a_uint)(x) + 2 * INOPB - 1) / INOPB))) 112#else 113#define itod(x) (a_daddr_t)((((a_uint)(x) + 15) >> 3)) 114#endif 115 116/* inumber to disk offset */ 117#if UCB_NKB == 1 118#define itoo(x) ((a_int)(((x) + 2 * INOPB - 1) % INOPB)) 119#else 120#define itoo(x) (a_int)(((x) + 15) & 07) 121#endif 122 123#if UCB_NKB == 1 124#define NADDR 7 125#define NINDEX 6 126#else 127#define NADDR 13 128#define NINDEX 15 129#endif 130 131/* flags */ 132#define ILOCK 01 /* inode is locked */ 133#define IUPD 02 /* inode has been modified */ 134#define IACC 04 /* inode access time to be updated */ 135#define IMOUNT 010 /* inode is mounted on */ 136#define IWANT 020 /* some process waiting on lock */ 137#define ITEXT 040 /* inode is pure text prototype */ 138#define ICHG 0100 /* inode has been changed */ 139#define IPIPE 0200 /* inode is a pipe */ 140#ifdef UCB_QUOTAS 141#define IQUOT 0400 /* directory that has original quota pointer */ 142#endif 143 144/* modes */ 145#define IFMT 0170000 /* type of file */ 146#define IFDIR 0040000 /* directory */ 147#define IFCHR 0020000 /* character special */ 148#define IFMPC 0030000 /* multiplexed char special */ 149#define IFBLK 0060000 /* block special, 0 is regular */ 150#define IFMPB 0070000 /* multiplexed block special */ 151#define IFREG 0100000 /* regular */ 152#define IFLNK 0120000 /* symbolic link */ 153#define IFQUOT 0140000 /* quota */ 154#define ISUID 04000 /* set user id on execution */ 155#define ISGID 02000 /* set group id on execution */ 156#define ISVTX 01000 /* save swapped text even after use */ 157#define IREAD 0400 /* read, write, execute permissions */ 158#define IRWRITE 0200 159#define IEXEC 0100 160 161struct dent { 162 a_ino_t u_ino; /* inode table pointer */ 163 char u_name[DIRSIZ]; /* component name */ 164} __attribute__((packed)); 165 166struct fblk { 167 a_short df_nfree; 168 a_daddr_t df_free[NICFREE]; 169} __attribute__((packed)); 170 171#endif /* _ANCIENTFS_29BSD_H_ */