projects / unix-history / blame
| Commit | Line | Data |
|---|---|---|
| f86df66c | 1 | /* inode.h 3.6 %G% */ |
| d0064d3a BJ |
2 | |
| 3 | /* | |
| 4 | * The I node is the focus of all | |
| 5 | * file activity in unix. There is a unique | |
| 6 | * inode allocated for each active file, | |
| 7 | * each current directory, each mounted-on | |
| 8 | * file, text file, and the root. An inode is 'named' | |
| 9 | * by its dev/inumber pair. (iget/iget.c) | |
| 10 | * Data, from mode on, is read in | |
| 11 | * from permanent inode on volume. | |
| 12 | */ | |
| 13 | ||
| 14 | #define NADDR 13 | |
| 15 | ||
| 16 | #define NINDEX 15 | |
| 17 | struct group | |
| 18 | { | |
| 19 | short g_state; | |
| 20 | char g_index; | |
| 21 | char g_rot; | |
| 22 | struct group *g_group; | |
| 23 | struct inode *g_inode; | |
| 24 | struct file *g_file; | |
| 25 | short g_rotmask; | |
| 26 | short g_datq; | |
| 27 | struct chan *g_chans[NINDEX]; | |
| 28 | }; | |
| 29 | struct inode | |
| 30 | { | |
| 31 | char i_flag; | |
| 32 | char i_count; /* reference count */ | |
| 33 | dev_t i_dev; /* device where inode resides */ | |
| 34 | ino_t i_number; /* i number, 1-to-1 with device address */ | |
| 35 | unsigned short i_mode; | |
| 36 | short i_nlink; /* directory entries */ | |
| 37 | short i_uid; /* owner */ | |
| 38 | short i_gid; /* group of owner */ | |
| 39 | off_t i_size; /* size of file */ | |
| 40 | union { | |
| 41 | struct { | |
| 0aee3fe5 | 42 | daddr_t I_addr[NADDR]; /* if normal file/directory */ |
| cd01c533 | 43 | daddr_t I_lastr; /* last read (for read-ahead) */ |
| 0aee3fe5 BJ |
44 | } i_f; |
| 45 | #define i_addr i_f.I_addr | |
| 46 | #define i_lastr i_f.I_lastr | |
| d0064d3a | 47 | struct { |
| 0aee3fe5 BJ |
48 | daddr_t I_rdev; /* i_addr[0] */ |
| 49 | struct group I_group; /* multiplexor group file */ | |
| 50 | } i_d; | |
| 51 | #define i_rdev i_d.I_rdev | |
| 52 | #define i_group i_d.I_group | |
| d0064d3a BJ |
53 | } i_un; |
| 54 | short i_vfdcnt; /* number of fd's vreading this inode */ | |
| 55 | short i_hlink; /* link in hash chain (iget/iput/ifind) */ | |
| 56 | }; | |
| 57 | ||
| 58 | #ifdef KERNEL | |
| 59 | extern struct inode inode[]; /* The inode table itself */ | |
| 60 | ||
| 61 | struct inode *rootdir; /* pointer to inode of root directory */ | |
| 62 | struct inode *mpxip; /* mpx virtual inode */ | |
| 63 | ||
| 64 | struct inode *ialloc(); | |
| 65 | struct inode *ifind(); | |
| 66 | struct inode *iget(); | |
| 67 | struct inode *owner(); | |
| 68 | struct inode *maknode(); | |
| 69 | struct inode *namei(); | |
| 70 | #endif | |
| 71 | ||
| 72 | /* flags */ | |
| 73 | #define ILOCK 01 /* inode is locked */ | |
| 74 | #define IUPD 02 /* file has been modified */ | |
| 75 | #define IACC 04 /* inode access time to be updated */ | |
| 76 | #define IMOUNT 010 /* inode is mounted on */ | |
| 77 | #define IWANT 020 /* some process waiting on lock */ | |
| 78 | #define ITEXT 040 /* inode is pure text prototype */ | |
| 79 | #define ICHG 0100 /* inode has been changed */ | |
| eec31342 | 80 | #define IPIPE 0200 /* inode is a pipe */ |
| d0064d3a BJ |
81 | |
| 82 | /* modes */ | |
| 83 | #define IFMT 0170000 /* type of file */ | |
| 84 | #define IFDIR 0040000 /* directory */ | |
| 85 | #define IFCHR 0020000 /* character special */ | |
| 86 | #define IFBLK 0060000 /* block special */ | |
| 87 | #define IFREG 0100000 /* regular */ | |
| 88 | #define IFMPC 0030000 /* multiplexed char special */ | |
| 89 | #define IFMPB 0070000 /* multiplexed block special */ | |
| 90 | #define ISUID 04000 /* set user id on execution */ | |
| 91 | #define ISGID 02000 /* set group id on execution */ | |
| 92 | #define ISVTX 01000 /* save swapped text even after use */ | |
| 93 | #define IREAD 0400 /* read, write, execute permissions */ | |
| 94 | #define IWRITE 0200 | |
| 95 | #define IEXEC 0100 |