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