Xenix Filesystem Comparison

The following tables compare the filesystem parameters and structures from various versions of the Xenix filesystem with their counterparts from the original AT&T Unix source code.

Currently the tables cover early versions of Xenix only, up to Xenix 3.0. Later versions of Xenix (specifically, Xenix V and beyond) have yet to be analyzed.

Xenix versions derived from 7th Edition Unix

7th Edition

TRS-XENIX v01.03.00 (Microsoft XENIX-68000 v2.3a), Altos Xenix 2.2 for ACS 8600 R1.0c (CDC-114)

#define BSIZE 512 struct filsys { unsigned short s_isize; daddr_t s_fsize; short s_nfree; daddr_t s_free[NICFREE]; short s_ninode; ino_t s_inode[NICINOD]; char s_flock; char s_ilock; char s_fmod; char s_ronly; time_t s_time; daddr_t s_tfree; ino_t s_tinode; short s_m; short s_n; char s_fname[6]; char s_fpack[6]; }; #define NICFREE 50 #define NICINOD 100 struct direct { ino_t d_ino; char d_name[DIRSIZ]; }; #define DIRSIZ 14 struct dinode { unsigned short di_mode; short di_nlink; short di_uid; short di_gid; off_t di_size; char di_addr[40]; time_t di_atime; time_t di_mtime; time_t di_ctime; }; #define INOPB 8

#define BSIZE 512 struct filsys { unsigned short s_isize; daddr_t s_fsize; short s_nfree; daddr_t s_free[NICFREE]; short s_ninode; ino_t s_inode[NICINOD]; char s_flock; char s_ilock; char s_fmod; char s_ronly; time_t s_time; daddr_t s_tfree; ino_t s_tinode; short s_m; short s_n; char s_fname[6]; char s_fpack[6]; char s_clean; }; #define NICFREE 50 #define NICINOD 100 #define S_CLEAN 0106 struct direct { ino_t d_ino; char d_name[DIRSIZ]; }; #define DIRSIZ 14 struct dinode { unsigned short di_mode; short di_nlink; short di_uid; short di_gid; off_t di_size; char di_addr[40]; time_t di_atime; time_t di_mtime; time_t di_ctime; }; #define INOPB 8

Xenix versions derived from System III Unix

System III	IBM PC XENIX 1.0	Tandy 68000/XENIX v03.01.00 (Microsoft XENIX v3.0)
#define BSIZE 512 struct filsys { ushort s_isize; daddr_t s_fsize; short s_nfree; daddr_t s_free[NICFREE]; short s_ninode; ino_t s_inode[NICINOD]; char s_flock; char s_ilock; char s_fmod; char s_ronly; time_t s_time; short s_dinfo[4]; daddr_t s_tfree; ino_t s_tinode; char s_fname[6]; char s_fpack[6]; }; #define NICFREE 50 #define NICINOD 100 struct direct { ino_t d_ino; char d_name[DIRSIZ]; }; #define DIRSIZ 14 struct dinode { ushort di_mode; short di_nlink; ushort di_uid; ushort di_gid; off_t di_size; char di_addr[40]; time_t di_atime; time_t di_mtime; time_t di_ctime; }; #define INOPB 8	#define BSIZE 1024 struct filsys { ushort s_isize; daddr_t s_fsize; short s_nfree; daddr_t s_free[NICFREE]; short s_ninode; ino_t s_inode[NICINOD]; char s_flock; char s_ilock; char s_fmod; char s_ronly; time_t s_time; daddr_t s_tfree; ino_t s_tinode; short s_dinfo[4]; char s_fname[6]; char s_fpack[6]; char s_clean; char s_fill[NSBFILL]; long s_magic; long s_type; }; #define NICFREE 100 #define NICINOD 100 #define S_CLEAN 0106 #define S_S3MAGIC 0x2b5544 #define S_B512 1 #define S_B1024 2 #define S_V2 1 #define S_V3 2 #define NSBFILL 370 struct direct { ino_t d_ino; char d_name[DIRSIZ]; }; #define DIRSIZ 14 struct dinode { ushort di_mode; short di_nlink; ushort di_uid; ushort di_gid; off_t di_size; char di_addr[40]; time_t di_atime; time_t di_mtime; time_t di_ctime; }; #define INOPB (BSIZE/ sizeof(struct dinode))	#define BSIZE 512 struct filsys { ushort s_isize; daddr_t s_fsize; short s_nfree; daddr_t s_free[NICFREE]; short s_ninode; ino_t s_inode[NICINOD]; char s_flock; char s_ilock; char s_fmod; char s_ronly; time_t s_time; daddr_t s_tfree; ino_t s_tinode; short s_dinfo[4]; char s_fname[6]; char s_fpack[6]; char s_clean; char s_fill[NSBFILL]; long s_magic; long s_type; }; #define NICFREE 50 #define NICINOD 100 #define S_CLEAN 0106 #define S_S3MAGIC 0x2b5544 #define S_B512 1 #define S_B1024 2 #define S_V2 1 #define S_V3 2 #define NSBFILL 51 struct direct { ino_t d_ino; char d_name[DIRSIZ]; }; #define DIRSIZ 14 struct dinode { ushort di_mode; short di_nlink; ushort di_uid; ushort di_gid; off_t di_size; char di_addr[40]; time_t di_atime; time_t di_mtime; time_t di_ctime; }; #define INOPB (BSIZE/ sizeof(struct dinode))