projects / unix-history / blame
| Commit | Line | Data |
|---|---|---|
| 05620f8c TL |
1 | /* |
| 2 | * The I node is the focus of all | |
| 3 | * file activity in unix. There is a unique | |
| 4 | * inode allocated for each active file, | |
| 5 | * each current directory, each mounted-on | |
| 6 | * file, text file, and the root. An inode is 'named' | |
| 7 | * by its dev/inumber pair. (iget/iget.c) | |
| 8 | * Data, from mode on, is read in | |
| 9 | * from permanent inode on volume. | |
| 10 | */ | |
| 11 | ||
| 12 | #define NADDR 13 | |
| 13 | ||
| 14 | #define NINDEX 15 | |
| 15 | struct group { | |
| 16 | short g_state; | |
| 17 | char g_index; | |
| 18 | char g_rot; | |
| 19 | struct group *g_group; | |
| 20 | struct inode *g_inode; | |
| 21 | struct file *g_file; | |
| 22 | short g_rotmask; | |
| 23 | short g_datq; | |
| 24 | struct chan *g_chans[NINDEX]; | |
| 25 | }; | |
| 26 | struct inode | |
| 27 | { | |
| 28 | char i_flag; | |
| 29 | char i_count; /* reference count */ | |
| 30 | dev_t i_dev; /* device where inode resides */ | |
| 31 | ino_t i_number; /* i number, 1-to-1 with device address */ | |
| 32 | unsigned short i_mode; | |
| 33 | short i_nlink; /* directory entries */ | |
| 34 | short i_uid; /* owner */ | |
| 35 | short i_gid; /* group of owner */ | |
| 36 | off_t i_size; /* size of file */ | |
| 37 | union { | |
| 38 | struct { | |
| 39 | daddr_t i_addr[NADDR]; /* if normal file/directory */ | |
| 40 | daddr_t i_lastr; /* last logical block read (for read-ahead) */ | |
| 41 | }; | |
| 42 | struct { | |
| 43 | daddr_t i_rdev; /* i_addr[0] */ | |
| 44 | struct group i_group; /* multiplexor group file */ | |
| 45 | }; | |
| 46 | } i_un; | |
| 47 | }; | |
| 48 | ||
| 49 | ||
| 50 | extern struct inode inode[]; /* The inode table itself */ | |
| 51 | struct inode *mpxip; /* mpx virtual inode */ | |
| 52 | ||
| 53 | /* flags */ | |
| 54 | #define ILOCK 01 /* inode is locked */ | |
| 55 | #define IUPD 02 /* file has been modified */ | |
| 56 | #define IACC 04 /* inode access time to be updated */ | |
| 57 | #define IMOUNT 010 /* inode is mounted on */ | |
| 58 | #define IWANT 020 /* some process waiting on lock */ | |
| 59 | #define ITEXT 040 /* inode is pure text prototype */ | |
| 60 | #define ICHG 0100 /* inode has been changed */ | |
| 61 | ||
| 62 | /* modes */ | |
| 63 | #define IFMT 0170000 /* type of file */ | |
| 64 | #define IFDIR 0040000 /* directory */ | |
| 65 | #define IFCHR 0020000 /* character special */ | |
| 66 | #define IFBLK 0060000 /* block special */ | |
| 67 | #define IFREG 0100000 /* regular */ | |
| 68 | #define IFMPC 0030000 /* multiplexed char special */ | |
| 69 | #define IFMPB 0070000 /* multiplexed block special */ | |
| 70 | #define ISUID 04000 /* set user id on execution */ | |
| 71 | #define ISGID 02000 /* set group id on execution */ | |
| 72 | #define ISVTX 01000 /* save swapped text even after use */ | |
| 73 | #define IREAD 0400 /* read, write, execute permissions */ | |
| 74 | #define IWRITE 0200 | |
| 75 | #define IEXEC 0100 |