inode_ufs(4)

inode (ufs) -- format of a ufs inode

Synopsis

   #include <sys/param.h>
   #include <sys/types.h>
   #include <sys/vnode.h>
   #include <sys/fs/ufs_inode.h>

Description

The inode is the focus of all local file activity in UNIX. There is a unique inode allocated for each active file, each current directory, each mounted-on file, each mapping, and the root. An inode is `named' by its dev/inumber pair. Data in icommon is read in from permanent inode on the actual volume.

   struct inode {
   /* Filesystem independent view of this inode. */
   	struct inode	*i_forw;	/* hash chain, forward */
   	struct inode	*i_back;	/* hash chain, back */
   	struct inode	*i_freef;	/* free chain, forward */
   	struct inode	*i_freeb;	/* free chain, back */
   	struct vnode	*i_vp;		/* ptr to vnode */
   	struct idata	*i_data;	/* pointer to the pool data */
   
   /* Filesystem dependent view of this inode. */
   	union  i_secure	*i_secp;	/* extra memory for security data */
   	struct	vnode  i_vnode;	/* vnode for this inode */
   

   	struct	vnode  *i_devvp;	/* vnode for block I/O */
   	ushort_t	i_flag;		/* inode flags (see below) */
   	dev_t	i_dev;		/* device where inode resides */
   	ino_t	i_number;	/* i number, 1-to-1 with device address */
   	off_t	i_diroff;	/* offset in dir, where we found last
   			   entry */
   	struct	fs *i_fs;	/* file sys associated with this inode */
   	struct	dquot *i_dquot;	/* quota structure controlling this file */
   	short	i_owner;	/* proc index of process locking inode */
   	short	i_count;	/* number of inode locks for i_owner */
   	daddr_t	i_nextr;	/* next byte read offset (read-ahead) */
   	ulong	i_vcode;	/* version code attribute */
   	long	i_mapcnt;	/* mappings to file pages */
   	int	*i_map;		/* block list for the corresponding file */
   	int	i_opencnt;	/* count of opens for this inode */
   	lid_t	i_dirofflid;	/* last proc changing i_diroff w/o write
   			   access */
   	clock_t	i_stamp;	/* time when inode was modified but not
   			   copied to the buffer cache */
   	struct 	icommon i_ic;	
   };
   

   struct  icommon {
   	o_mode_t	ic_smode;	/*  0: mode and type of file */
   	short	ic_nlink;	/*  2: number of links to file */
   	o_uid_t	ic_suid;	/*  4: owner's user id */
   	o_gid_t	ic_sgid;	/*  6: owner's group id */
   	quad	ic_size;	/*  8: number of bytes in file */




   #ifdef _KERNEL
   	struct timeval ic_atime;/* 16: time last accessed */
   	struct timeval ic_mtime;/* 24: time last modified */
   	nstruct timeval ic_ctime;/* 32: last time inode changed */
   #else
   	time_t	ic_atime;	/* 16: time last accessed */
   	long	ic_atspare;
   	time_t	ic_mtime;	/* 24: time last modified */
   	long	ic_mtspare;
   	time_t	ic_ctime;	/* 32: last time inode changed */
   	long	ic_ctspare;
   #endif
   	daddr_t	ic_db[NDADDR];	/* 40: disk block addresses */
   	daddr_t	ic_ib[NIADDR];	/* 88: indirect blocks */
   	long	ic_flags;	/* 100: status, currently unused */
   	long	ic_blocks;	/* 104: blocks actually held */
   	long	ic_gen;		/* 108: generation number */
   	mode_t	ic_mode;	/* 112: EFT version of mode*/
   	uid_t	ic_uid;		/* 116: EFT version of uid */
   	gid_t	ic_gid;		/* 120: EFT version of gid */
   	ulong	ic_eftflag;	/* 124: indicate EFT version*/
   };

References

ufs-specific fs_ufs(4)