minix/servers/mfs/inode.h
2008-02-06 15:05:57 +00:00

63 lines
2.7 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.
*
* Updates:
* 2007-01-06: jfdsmit@gmail.com added i_zsearch
*/
#include "queue.h"
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 */
bit_t i_zsearch; /* where to start search for new zones */
char i_mountpoint; /* true if mounted on */
char i_seek; /* set on LSEEK, cleared on READ/WRITE */
char i_update; /* the ATIME, CTIME, and MTIME bits are here */
LIST_ENTRY(inode) i_hash; /* hash list */
TAILQ_ENTRY(inode) i_unused; /* free and unused list */
} inode[NR_INODES];
/* list of unused/free inodes */
EXTERN TAILQ_HEAD(unused_inodes_t, inode) unused_inodes;
/* inode hashtable */
EXTERN LIST_HEAD(inodelist, inode) hash_inodes[INODE_HASH_SIZE];
EXTERN unsigned int inode_cache_hit;
EXTERN unsigned int inode_cache_miss;
#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_SEEK 0 /* i_seek = NO_SEEK if last op was not SEEK */
#define ISEEK 1 /* i_seek = ISEEK if last op was SEEK */