projects / unix-history / blame
| Commit | Line | Data |
|---|---|---|
| a59abf09 | 1 | /* inode.h 4.8 81/11/08 */ |
| d0064d3a BJ |
2 | |
| 3 | /* | |
| a59abf09 BJ |
4 | * The I node is the focus of all file activity in UNIX. |
| 5 | * There is a unique inode allocated for each active file, | |
| 6 | * each current directory, each mounted-on file, text file, and the root. | |
| 7 | * An inode is 'named' by its dev/inumber pair. (iget/iget.c) | |
| 8 | * Data, from mode on, is read in from permanent inode on volume. | |
| d0064d3a | 9 | */ |
| d0064d3a BJ |
10 | #define NADDR 13 |
| 11 | ||
| a59abf09 | 12 | struct inode { |
| d0064d3a BJ |
13 | char i_flag; |
| 14 | char i_count; /* reference count */ | |
| 15 | dev_t i_dev; /* device where inode resides */ | |
| 16 | ino_t i_number; /* i number, 1-to-1 with device address */ | |
| a59abf09 BJ |
17 | /* begin read from disk */ |
| 18 | u_short i_mode; | |
| d0064d3a BJ |
19 | short i_nlink; /* directory entries */ |
| 20 | short i_uid; /* owner */ | |
| 21 | short i_gid; /* group of owner */ | |
| 22 | off_t i_size; /* size of file */ | |
| 23 | union { | |
| 24 | struct { | |
| 0aee3fe5 | 25 | daddr_t I_addr[NADDR]; /* if normal file/directory */ |
| a59abf09 | 26 | daddr_t I_lastr; /* last read (read-ahead) */ |
| 0aee3fe5 BJ |
27 | } i_f; |
| 28 | #define i_addr i_f.I_addr | |
| 29 | #define i_lastr i_f.I_lastr | |
| d0064d3a | 30 | struct { |
| 0aee3fe5 | 31 | daddr_t I_rdev; /* i_addr[0] */ |
| 0aee3fe5 BJ |
32 | } i_d; |
| 33 | #define i_rdev i_d.I_rdev | |
| d0064d3a | 34 | } i_un; |
| a59abf09 BJ |
35 | /* end read from disk */ |
| 36 | short i_XXXXXX; /* ### */ | |
| 37 | /* SHOULD USE POINTERS, NOT INDICES, FOR HAS CHAIN */ | |
| d0064d3a BJ |
38 | short i_hlink; /* link in hash chain (iget/iput/ifind) */ |
| 39 | }; | |
| 40 | ||
| 41 | #ifdef KERNEL | |
| a0eab615 BJ |
42 | struct inode *inode, *inodeNINODE; |
| 43 | int ninode; | |
| d0064d3a BJ |
44 | |
| 45 | struct inode *rootdir; /* pointer to inode of root directory */ | |
| d0064d3a BJ |
46 | |
| 47 | struct inode *ialloc(); | |
| 48 | struct inode *ifind(); | |
| 49 | struct inode *iget(); | |
| 50 | struct inode *owner(); | |
| 51 | struct inode *maknode(); | |
| 52 | struct inode *namei(); | |
| 53 | #endif | |
| 54 | ||
| 55 | /* flags */ | |
| 56 | #define ILOCK 01 /* inode is locked */ | |
| 57 | #define IUPD 02 /* file has been modified */ | |
| 58 | #define IACC 04 /* inode access time to be updated */ | |
| 59 | #define IMOUNT 010 /* inode is mounted on */ | |
| 60 | #define IWANT 020 /* some process waiting on lock */ | |
| 61 | #define ITEXT 040 /* inode is pure text prototype */ | |
| 62 | #define ICHG 0100 /* inode has been changed */ | |
| 63 | ||
| 64 | /* modes */ | |
| 65 | #define IFMT 0170000 /* type of file */ | |
| 66 | #define IFDIR 0040000 /* directory */ | |
| 67 | #define IFCHR 0020000 /* character special */ | |
| 68 | #define IFBLK 0060000 /* block special */ | |
| 69 | #define IFREG 0100000 /* regular */ | |
| d0064d3a BJ |
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 |