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1.1 root 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: struct inode
15: {
16: short i_flag;
17: u_char i_count; /* reference count */
18: char i_fstyp; /* type of its filesystem */
19: dev_t i_dev; /* device where inode resides */
20: long i_number; /* i number, 1-to-1 with device address */
21: unsigned short i_mode;
22: short i_nlink; /* directory entries */
23: short i_uid; /* owner */
24: short i_gid; /* group of owner */
25: off_t i_size; /* size of file */
26: struct inode *i_mroot; /* if mount point, root inode */
27: struct inode *i_mpoint; /* inode of mount point */
28: struct stdata *i_sptr; /* stream associated with this inode */
29: union {
30: struct {
31: daddr_t I_addr[NADDR]; /* if normal file/directory */
32: daddr_t I_lastr; /* last read (for read-ahead) */
33: struct buf *I_bufp; /* buffer for super-block */
34: } i_f;
35: #define i_addr i_f.I_addr
36: #define i_lastr i_f.I_lastr
37: #define i_bufp i_f.I_bufp
38: struct {
39: daddr_t I_rdev; /* i_addr[0] */
40: long I_key; /* see istread */
41: } i_d;
42: #define i_rdev i_d.I_rdev
43: #define i_key i_d.I_key
44: struct {
45: long I_tag;
46: struct inode *I_cip; /* communications */
47: } i_a; /* when i_fstyp != 0 */
48: #define i_tag i_a.I_tag
49: #define i_cip i_a.I_cip
50: struct {
51: struct proc *I_proc; /* sanity checking */
52: int I_sigmask; /* signal trace mask */
53: } i_p;
54: #define i_proc i_p.I_proc
55: #define i_sigmask i_p.I_sigmask
56: } i_un;
57: struct inode *i_hlink; /* link in hash chain (iget/iput/ifind) */
58: };
59:
60: #ifdef KERNEL
61: struct inode *inode, *inodeNINODE;
62: int ninode;
63:
64: struct inode *rootdir; /* pointer to inode of root directory */
65:
66: struct inode *ialloc();
67: struct inode *ifind();
68: struct inode *iget();
69: struct inode *owner();
70: struct inode *maknode();
71: struct inode *namei();
72: struct inode *openi();
73: #endif
74:
75: /* flags */
76: #define ILOCK 01 /* inode is locked */
77: #define IUPD 02 /* file has been modified */
78: #define IACC 04 /* inode access time to be updated */
79: #define IMOUNT 010 /* inode is mounted on */
80: #define IWANT 020 /* some process waiting on lock */
81: #define ITEXT 040 /* inode is pure text prototype */
82: #define ICHG 0100 /* inode has been changed */
83: #define IPIPE 0200 /* inode is a pipe */
84: #define IDEAD 0400 /* only iput and iget */
85:
86: /* modes */
87: #define IFMT 0170000 /* type of file */
88: #define IFDIR 0040000 /* directory */
89: #define IFCHR 0020000 /* character special */
90: #define IFBLK 0060000 /* block special */
91: #define IFREG 0100000 /* regular */
92: #define IFLNK 0120000 /* symbolic link to another file */
93: #define ISUID 04000 /* set user id on execution */
94: #define ISGID 02000 /* set group id on execution */
95: #define IREAD 0400 /* read, write, execute permissions */
96: #define IWRITE 0200
97: #define IEXEC 0100
98: #define ICONC 0001000 /* this file is protected for concurrent access */
99: #define ICCTYP 0007000 /* type of concurrent access */
100: #define ISYNC 0001000 /* 1 writer and n readers (synchronized access) */
101: #define IEXCL 0003000 /* 1 writer or n readers (exclusive access) */
102:
103: struct argnamei { /* namei's flag argument */
104: short flag; /* type of request */
105: short mode; /* mode for creating */
106: struct inode *il; /* for linking */
107: short done; /* used as a return flag in creat */
108: } nilargnamei;
109: #define NI_DEL 1 /* unlink this file */
110: #define NI_CREAT 2 /* create it if it doesn't exits */
111: #define NI_NXCREAT 3 /* create it, error if it already exists */
112: #define NI_LINK 4 /* make a link */
113: #define NI_MKDIR 5 /* make a directory */
114: #define NI_RMDIR 6 /* remove a directory */
115: struct nx { /* arg to real nami */
116: struct inode *dp;
117: char *cp;
118: struct buf *nbp;
119: int nlink;
120: };
121:
122: /*
123: * some inline subroutines to speed things up
124: */
125:
126: #ifdef KERNEL
127:
128: #define plock(ip) \
129: { \
130: while ((ip)->i_flag & ILOCK) { \
131: (ip)->i_flag |= IWANT; \
132: sleep((caddr_t)(ip), PINOD); \
133: } \
134: (ip)->i_flag |= ILOCK; \
135: }
136:
137: #define prele(ip) \
138: { \
139: (ip)->i_flag &= ~ILOCK; \
140: if ((ip)->i_flag&IWANT) { \
141: (ip)->i_flag &= ~IWANT; \
142: wakeup((caddr_t)(ip)); \
143: } \
144: }
145:
146: #endif
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