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1.1 root 1: /*
2: * Copyright (c) 1982, 1989 The Regents of the University of California.
3: * All rights reserved.
4: *
5: * Redistribution is only permitted until one year after the first shipment
6: * of 4.4BSD by the Regents. Otherwise, redistribution and use in source and
7: * binary forms are permitted provided that: (1) source distributions retain
8: * this entire copyright notice and comment, and (2) distributions including
9: * binaries display the following acknowledgement: This product includes
10: * software developed by the University of California, Berkeley and its
11: * contributors'' in the documentation or other materials provided with the
12: * distribution and in all advertising materials mentioning features or use
13: * of this software. Neither the name of the University nor the names of
14: * its contributors may be used to endorse or promote products derived from
15: * this software without specific prior written permission.
16: * THIS SOFTWARE IS PROVIDED AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
17: * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
18: * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
19: *
20: * @(#)inode.h 7.13 (Berkeley) 5/10/90
21: */
22:
23: #ifdef KERNEL
24: #include "../ufs/dinode.h"
25: #else
26: #include <ufs/dinode.h>
27: #endif
28:
29: /*
30: * The I node is the focus of all file activity in UNIX.
31: * There is a unique inode allocated for each active file,
32: * each current directory, each mounted-on file, text file, and the root.
33: * An inode is 'named' by its dev/inumber pair. (iget/iget.c)
34: * Data in `struct dinode' is read in from permanent inode on volume.
35: */
36:
37: struct inode {
38: struct inode *i_chain[2]; /* hash chain, MUST be first */
39: struct vnode *i_vnode; /* vnode associated with this inode */
40: struct vnode *i_devvp; /* vnode for block I/O */
41: u_long i_flag; /* see below */
42: dev_t i_dev; /* device where inode resides */
43: ino_t i_number; /* i number, 1-to-1 with device address */
44: struct fs *i_fs; /* file sys associated with this inode */
45: struct dquot *i_dquot[MAXQUOTAS]; /* pointer to dquot strauctures */
46: long i_diroff; /* offset in dir, where we found last entry */
47: off_t i_endoff; /* end of useful stuff in directory */
48: long i_spare0;
49: long i_spare1;
50: struct dinode i_din; /* the on-disk inode */
51: };
52:
53: #define i_mode i_din.di_mode
54: #define i_nlink i_din.di_nlink
55: #define i_uid i_din.di_uid
56: #define i_gid i_din.di_gid
57: #if BYTE_ORDER == LITTLE_ENDIAN || defined(tahoe) /* ugh! -- must be fixed */
58: #define i_size i_din.di_qsize.val[0]
59: #else /* BYTE_ORDER == BIG_ENDIAN */
60: #define i_size i_din.di_qsize.val[1]
61: #endif
62: #define i_db i_din.di_db
63: #define i_ib i_din.di_ib
64: #define i_atime i_din.di_atime
65: #define i_mtime i_din.di_mtime
66: #define i_ctime i_din.di_ctime
67: #define i_blocks i_din.di_blocks
68: #define i_rdev i_din.di_db[0]
69: #define i_flags i_din.di_flags
70: #define i_gen i_din.di_gen
71: #define i_forw i_chain[0]
72: #define i_back i_chain[1]
73:
74: /* flags */
75: #define ILOCKED 0x0001 /* inode is locked */
76: #define IWANT 0x0002 /* some process waiting on lock */
77: #define IRENAME 0x0004 /* inode is being renamed */
78: #define IUPD 0x0010 /* file has been modified */
79: #define IACC 0x0020 /* inode access time to be updated */
80: #define ICHG 0x0040 /* inode has been changed */
81: #define IMOD 0x0080 /* inode has been modified */
82: #define ISHLOCK 0x0100 /* file has shared lock */
83: #define IEXLOCK 0x0200 /* file has exclusive lock */
84: #define ILWAIT 0x0400 /* someone waiting on file lock */
85:
86: #ifdef KERNEL
87: /*
88: * Convert between inode pointers and vnode pointers
89: */
90: #define VTOI(vp) ((struct inode *)(vp)->v_data)
91: #define ITOV(ip) ((ip)->i_vnode)
92:
93: /*
94: * Convert between vnode types and inode formats
95: */
96: extern enum vtype iftovt_tab[];
97: extern int vttoif_tab[];
98: #define IFTOVT(mode) (iftovt_tab[((mode) & IFMT) >> 12])
99: #define VTTOIF(indx) (vttoif_tab[(int)(indx)])
100:
101: #define MAKEIMODE(indx, mode) (int)(VTTOIF(indx) | (mode))
102:
103: u_long nextgennumber; /* next generation number to assign */
104:
105: extern ino_t dirpref();
106:
107: /*
108: * Lock and unlock inodes.
109: */
110: #ifdef notdef
111: #define ILOCK(ip) { \
112: while ((ip)->i_flag & ILOCKED) { \
113: (ip)->i_flag |= IWANT; \
114: (void) sleep((caddr_t)(ip), PINOD); \
115: } \
116: (ip)->i_flag |= ILOCKED; \
117: }
118:
119: #define IUNLOCK(ip) { \
120: (ip)->i_flag &= ~ILOCKED; \
121: if ((ip)->i_flag&IWANT) { \
122: (ip)->i_flag &= ~IWANT; \
123: wakeup((caddr_t)(ip)); \
124: } \
125: }
126: #else
127: #define ILOCK(ip) ilock(ip)
128: #define IUNLOCK(ip) iunlock(ip)
129: #endif
130:
131: #define IUPDAT(ip, t1, t2, waitfor) { \
132: if (ip->i_flag&(IUPD|IACC|ICHG|IMOD)) \
133: (void) iupdat(ip, t1, t2, waitfor); \
134: }
135:
136: #define ITIMES(ip, t1, t2) { \
137: if ((ip)->i_flag&(IUPD|IACC|ICHG)) { \
138: (ip)->i_flag |= IMOD; \
139: if ((ip)->i_flag&IACC) \
140: (ip)->i_atime = (t1)->tv_sec; \
141: if ((ip)->i_flag&IUPD) \
142: (ip)->i_mtime = (t2)->tv_sec; \
143: if ((ip)->i_flag&ICHG) \
144: (ip)->i_ctime = time.tv_sec; \
145: (ip)->i_flag &= ~(IACC|IUPD|ICHG); \
146: } \
147: }
148:
149: /*
150: * This overlays the fid sturcture (see mount.h)
151: */
152: struct ufid {
153: u_short ufid_len; /* length of structure */
154: u_short ufid_pad; /* force long alignment */
155: ino_t ufid_ino; /* file number (ino) */
156: long ufid_gen; /* generation number */
157: };
158: #endif
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