4.3BSD-UWisc/include/ufs/inode.h
/* @(#)inode.h 1.1 86/02/03 SMI; from UCB 4.24 83/07/01 */
/* @(#)inode.h 2.2 86/05/15 NFSSRC */
#undef ITRACE
/*
* The I node is the focus of all file activity in UNIX.
* There is a unique inode allocated for each active file,
* each current directory, each mounted-on file, text file, and the root.
* An inode is 'named' by its dev/inumber pair. (iget/iget.c)
* Data in icommon is read in from permanent inode on volume.
*/
#define NDADDR 12 /* direct addresses in inode */
#define NIADDR 3 /* indirect addresses in inode */
struct inode {
struct inode *i_chain[2]; /* must be first */
struct vnode i_vnode; /* vnode associated with this inode */
struct vnode *i_devvp; /* vnode for block I/O */
u_short i_flag;
dev_t i_dev; /* device where inode resides */
ino_t i_number; /* i number, 1-to-1 with device address */
int 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 */
union {
daddr_t if_lastr; /* last read (read-ahead) */
struct socket *is_socket;
} i_un;
struct {
struct inode *if_freef; /* free list forward */
struct inode **if_freeb; /* free list back */
} i_fr;
struct icommon
{
u_short ic_mode; /* 0: mode and type of file */
short ic_nlink; /* 2: number of links to file */
short ic_uid; /* 4: owner's user id */
short ic_gid; /* 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 */
struct 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 */
long ic_spare[4]; /* 112: reserved, currently unused */
} i_ic;
};
struct dinode {
union {
struct icommon di_icom;
char di_size[128];
} di_un;
};
#define i_mode i_ic.ic_mode
#define i_nlink i_ic.ic_nlink
#define i_uid i_ic.ic_uid
#define i_gid i_ic.ic_gid
/* ugh! -- must be fixed */
#ifdef vax
# define i_size i_ic.ic_size.val[0]
#else vax
# ifdef mc68000
# define i_size i_ic.ic_size.val[1]
# else mc68000
neither vax nor mc68000 defined!
# endif mc68000
#endif vax
#define i_db i_ic.ic_db
#define i_ib i_ic.ic_ib
#define i_atime i_ic.ic_atime
#define i_mtime i_ic.ic_mtime
#define i_ctime i_ic.ic_ctime
#define i_blocks i_ic.ic_blocks
#define i_rdev i_ic.ic_db[0]
#define i_gen i_ic.ic_gen
#define i_lastr i_un.if_lastr
#define i_socket i_un.is_socket
#define i_forw i_chain[0]
#define i_back i_chain[1]
#define i_freef i_fr.if_freef
#define i_freeb i_fr.if_freeb
#define di_ic di_un.di_icom
#define di_mode di_ic.ic_mode
#define di_nlink di_ic.ic_nlink
#define di_uid di_ic.ic_uid
#define di_gid di_ic.ic_gid
#ifdef vax
# define di_size di_ic.ic_size.val[0]
#else vax
# ifdef mc68000
# define di_size di_ic.ic_size.val[1]
# else mc68000
neither vax nor mc68000 defined!
# endif mc68000
#endif vax
#define di_db di_ic.ic_db
#define di_ib di_ic.ic_ib
#define di_atime di_ic.ic_atime
#define di_mtime di_ic.ic_mtime
#define di_ctime di_ic.ic_ctime
#define di_rdev di_ic.ic_db[0]
#define di_blocks di_ic.ic_blocks
#define di_gen di_ic.ic_gen
#ifdef KERNEL
struct inode *inode; /* the inode table itself */
struct inode *inodeNINODE; /* the end of the inode table */
int ninode; /* number of slots in the table */
extern struct vnodeops ufs_vnodeops; /* vnode operations for ufs */
extern struct inode *ialloc();
extern struct inode *iget();
extern ino_t dirpref();
#endif
/* flags */
#define ILOCKED 0x1 /* inode is locked */
#define IUPD 0x2 /* file has been modified */
#define IACC 0x4 /* inode access time to be updated */
#ifdef notdef
#define IMOUNT 0x8 /* inode is mounted on */
#endif
#define IWANT 0x10 /* some process waiting on lock */
#define ITEXT 0x20 /* inode is pure text prototype */
#define ICHG 0x40 /* inode has been changed */
#ifdef notdef
#define ISHLOCK 0x80 /* file has shared lock */
#define IEXLOCK 0x100 /* file has exclusive lock */
#endif
#define ILWAIT 0x200 /* someone waiting on file lock */
#define IREF 0x400 /* inode is being referenced */
/* modes */
#define IFMT 0170000 /* type of file */
#define IFCHR 0020000 /* character special */
#define IFDIR 0040000 /* directory */
#define IFBLK 0060000 /* block special */
#define IFREG 0100000 /* regular */
#define IFLNK 0120000 /* symbolic link */
#define IFSOCK 0140000 /* socket */
#define ISUID 04000 /* set user id on execution */
#define ISGID 02000 /* set group id on execution */
#define ISVTX 01000 /* save swapped text even after use */
#define IREAD 0400 /* read, write, execute permissions */
#define IWRITE 0200
#define IEXEC 0100
#ifdef KERNEL
/*
* Convert between inode pointers and vnode pointers
*/
#define VTOI(VP) ((struct inode *)(VP)->v_data)
#define ITOV(IP) ((struct vnode *)&(IP)->i_vnode)
/*
* Convert between vnode types and inode formats
*/
extern enum vtype iftovt_tab[];
extern int vttoif_tab[];
#define IFTOVT(M) (iftovt_tab[((M) & IFMT) >> 13])
#define VTTOIF(T) (vttoif_tab[(int)(T)])
#define MAKEIMODE(T, M) (VTTOIF(T) | (M))
/*
* Lock and unlock inodes.
*/
#ifdef ITRACE
#define NITRACE 2048
extern int (*caller())();
extern int itrace();
extern int ilpanic();
#define ILOCK(ip) { \
while ((ip)->i_flag & ILOCKED) { \
(ip)->i_flag |= IWANT; \
sleep((caddr_t)(ip), PINOD); \
} \
itrace((ip), caller(), 1); \
timeout(ilpanic, (ip), 30*hz); \
(ip)->i_flag |= ILOCKED; \
}
#define IUNLOCK(ip) { \
(ip)->i_flag &= ~ILOCKED; \
untimeout(ilpanic, (ip)); \
itrace((ip), caller(), 0); \
if ((ip)->i_flag&IWANT) { \
(ip)->i_flag &= ~IWANT; \
wakeup((caddr_t)(ip)); \
} \
}
#else
#define ILOCK(ip) { \
while ((ip)->i_flag & ILOCKED) { \
(ip)->i_flag |= IWANT; \
sleep((caddr_t)(ip), PINOD); \
} \
(ip)->i_flag |= ILOCKED; \
}
#define IUNLOCK(ip) { \
(ip)->i_flag &= ~ILOCKED; \
if ((ip)->i_flag&IWANT) { \
(ip)->i_flag &= ~IWANT; \
wakeup((caddr_t)(ip)); \
} \
}
#endif
#define ESAME (-1) /* trying to rename linked files (special) */
/*
* Check that file is owned by current user or user is su.
*/
#define OWNER(CR, IP) (((CR)->cr_uid == (IP)->i_uid)? 0: (suser()? 0: u.u_error))
/*
* enums
*/
enum de_op { DE_CREATE, DE_LINK, DE_RENAME }; /* direnter ops */
#endif