1 /* Inode table. This table holds inodes that are currently in use. In some
2 * cases they have been opened by an open() or creat() system call, in other
3 * cases the file system itself needs the inode for one reason or another,
4 * such as to search a directory for a path name.
5 * The first part of the struct holds fields that are present on the
6 * disk; the second part holds fields not present on the disk.
7 * The disk inode part is also declared in "type.h" as 'd1_inode' for V1
8 * file systems and 'd2_inode' for V2 file systems.
9 */
10
11 EXTERN struct inode {
12 mode_t i_mode; /* file type, protection, etc. */
13 nlink_t i_nlinks; /* how many links to this file */
14 uid_t i_uid; /* user id of the file's owner */
15 gid_t i_gid; /* group number */
16 off_t i_size; /* current file size in bytes */
17 time_t i_atime; /* time of last access (V2 only) */
18 time_t i_mtime; /* when was file data last changed */
19 time_t i_ctime; /* when was inode itself changed (V2 only)*/
20 zone_t i_zone[V2_NR_TZONES]; /* zone numbers for direct, ind, and dbl ind */
21
22 /* The following items are not present on the disk. */
23 dev_t i_dev; /* which device is the inode on */
24 ino_t i_num; /* inode number on its (minor) device */
25 int i_count; /* # times inode used; 0 means slot is free */
26 int i_ndzones; /* # direct zones (Vx_NR_DZONES) */
27 int i_nindirs; /* # indirect zones per indirect block */
28 struct super_block *i_sp; /* pointer to super block for inode's device */
29 char i_dirt; /* CLEAN or DIRTY */
30 char i_pipe; /* set to I_PIPE if pipe */
31 char i_mount; /* this bit is set if file mounted on */
32 char i_seek; /* set on LSEEK, cleared on READ/WRITE */
33 char i_update; /* the ATIME, CTIME, and MTIME bits are here */
34 } inode[NR_INODES];
35
36
37 #define NIL_INODE (struct inode *) 0 /* indicates absence of inode slot */
38
39 /* Field values. Note that CLEAN and DIRTY are defined in "const.h" */
40 #define NO_PIPE 0 /* i_pipe is NO_PIPE if inode is not a pipe */
41 #define I_PIPE 1 /* i_pipe is I_PIPE if inode is a pipe */
42 #define NO_MOUNT 0 /* i_mount is NO_MOUNT if file not mounted on*/
43 #define I_MOUNT 1 /* i_mount is I_MOUNT if file mounted on */
44 #define NO_SEEK 0 /* i_seek = NO_SEEK if last op was not SEEK */
45 #define ISEEK 1 /* i_seek = ISEEK if last op was SEEK */
46
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