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1.1 root 1: /* inode.h 6.1 83/07/29 */
2:
3: /*
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 in icommon is read in from permanent inode on volume.
9: */
10:
11: #define NDADDR 12 /* direct addresses in inode */
12: #define NIADDR 3 /* indirect addresses in inode */
13:
14: struct inode {
15: struct inode *i_chain[2]; /* must be first */
16: u_short i_flag;
17: u_short i_count; /* reference count */
18: dev_t i_dev; /* device where inode resides */
19: u_short i_shlockc; /* count of shared locks on inode */
20: u_short i_exlockc; /* count of exclusive locks on inode */
21: ino_t i_number; /* i number, 1-to-1 with device address */
22: struct fs *i_fs; /* file sys associated with this inode */
23: struct dquot *i_dquot; /* quota structure controlling this file */
24: union {
25: daddr_t if_lastr; /* last read (read-ahead) */
26: struct socket *is_socket;
27: struct {
28: struct inode *if_freef; /* free list forward */
29: struct inode **if_freeb; /* free list back */
30: } i_fr;
31: } i_un;
32: struct icommon
33: {
34: u_short ic_mode; /* 0: mode and type of file */
35: short ic_nlink; /* 2: number of links to file */
36: short ic_uid; /* 4: owner's user id */
37: short ic_gid; /* 6: owner's group id */
38: quad ic_size; /* 8: number of bytes in file */
39: time_t ic_atime; /* 16: time last accessed */
40: long ic_atspare;
41: time_t ic_mtime; /* 24: time last modified */
42: long ic_mtspare;
43: time_t ic_ctime; /* 32: last time inode changed */
44: long ic_ctspare;
45: daddr_t ic_db[NDADDR]; /* 40: disk block addresses */
46: daddr_t ic_ib[NIADDR]; /* 88: indirect blocks */
47: long ic_flags; /* 100: status, currently unused */
48: long ic_blocks; /* 104: blocks actually held */
49: long ic_spare[5]; /* 108: reserved, currently unused */
50: } i_ic;
51: };
52:
53: struct dinode {
54: union {
55: struct icommon di_icom;
56: char di_size[128];
57: } di_un;
58: };
59:
60: #define i_mode i_ic.ic_mode
61: #define i_nlink i_ic.ic_nlink
62: #define i_uid i_ic.ic_uid
63: #define i_gid i_ic.ic_gid
64: /* ugh! -- must be fixed */
65: #ifdef vax
66: #define i_size i_ic.ic_size.val[0]
67: #endif
68: #define i_db i_ic.ic_db
69: #define i_ib i_ic.ic_ib
70: #define i_atime i_ic.ic_atime
71: #define i_mtime i_ic.ic_mtime
72: #define i_ctime i_ic.ic_ctime
73: #define i_blocks i_ic.ic_blocks
74: #define i_rdev i_ic.ic_db[0]
75: #define i_lastr i_un.if_lastr
76: #define i_socket i_un.is_socket
77: #define i_forw i_chain[0]
78: #define i_back i_chain[1]
79: #define i_freef i_un.i_fr.if_freef
80: #define i_freeb i_un.i_fr.if_freeb
81:
82: #define di_ic di_un.di_icom
83: #define di_mode di_ic.ic_mode
84: #define di_nlink di_ic.ic_nlink
85: #define di_uid di_ic.ic_uid
86: #define di_gid di_ic.ic_gid
87: #ifdef vax
88: #define di_size di_ic.ic_size.val[0]
89: #endif
90: #define di_db di_ic.ic_db
91: #define di_ib di_ic.ic_ib
92: #define di_atime di_ic.ic_atime
93: #define di_mtime di_ic.ic_mtime
94: #define di_ctime di_ic.ic_ctime
95: #define di_rdev di_ic.ic_db[0]
96: #define di_blocks di_ic.ic_blocks
97:
98: #ifdef KERNEL
99: struct inode *inode; /* the inode table itself */
100: struct inode *inodeNINODE; /* the end of the inode table */
101: int ninode; /* number of slots in the table */
102:
103: struct inode *rootdir; /* pointer to inode of root directory */
104:
105: struct inode *ialloc();
106: struct inode *iget();
107: #ifdef notdef
108: struct inode *ifind();
109: #endif
110: struct inode *owner();
111: struct inode *maknode();
112: struct inode *namei();
113:
114: ino_t dirpref();
115: #endif
116:
117: /* flags */
118: #define ILOCKED 0x1 /* inode is locked */
119: #define IUPD 0x2 /* file has been modified */
120: #define IACC 0x4 /* inode access time to be updated */
121: #define IMOUNT 0x8 /* inode is mounted on */
122: #define IWANT 0x10 /* some process waiting on lock */
123: #define ITEXT 0x20 /* inode is pure text prototype */
124: #define ICHG 0x40 /* inode has been changed */
125: #define ISHLOCK 0x80 /* file has shared lock */
126: #define IEXLOCK 0x100 /* file has exclusive lock */
127: #define ILWAIT 0x200 /* someone waiting on file lock */
128:
129: /* modes */
130: #define IFMT 0170000 /* type of file */
131: #define IFCHR 0020000 /* character special */
132: #define IFDIR 0040000 /* directory */
133: #define IFBLK 0060000 /* block special */
134: #define IFREG 0100000 /* regular */
135: #define IFLNK 0120000 /* symbolic link */
136: #define IFSOCK 0140000 /* socket */
137:
138: #define ISUID 04000 /* set user id on execution */
139: #define ISGID 02000 /* set group id on execution */
140: #define ISVTX 01000 /* save swapped text even after use */
141: #define IREAD 0400 /* read, write, execute permissions */
142: #define IWRITE 0200
143: #define IEXEC 0100
144:
145: #define ILOCK(ip) { \
146: while ((ip)->i_flag & ILOCKED) { \
147: (ip)->i_flag |= IWANT; \
148: sleep((caddr_t)(ip), PINOD); \
149: } \
150: (ip)->i_flag |= ILOCKED; \
151: }
152:
153: #define IUNLOCK(ip) { \
154: (ip)->i_flag &= ~ILOCKED; \
155: if ((ip)->i_flag&IWANT) { \
156: (ip)->i_flag &= ~IWANT; \
157: wakeup((caddr_t)(ip)); \
158: } \
159: }
160:
161: #define IUPDAT(ip, t1, t2, waitfor) { \
162: if (ip->i_flag&(IUPD|IACC|ICHG)) \
163: iupdat(ip, t1, t2, waitfor); \
164: }
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