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- /*
- * Copyright (C) Dataindustrier DIAB AB, Sweden, 1986
- */
- #ifndef _rhSYS_FS_DNIX_SYSFILE
- #define _rhSYS_FS_DNIX_SYSFILE
- /*
- * Structures used by filehandler
- * SCCSID(@(#) sysfile.h 5.2.2.1)
- */
- /*
- * Structure of the system-file
- *
- * This is a read-only structure for some vital volume parameters
- * All numerical values are 32-bit stored MSByte ... LSByte.
- * Last byte is an overall checksum computed as
- * the sum of all bytes modulo 256 and negated(so it will sum to 0).
- *
- * Soft checksum stuff:
- * If the "s_ckflg" flag is set, then soft checksum is enabled on this
- * volume. This checksum is computed by XOR'ing each data block
- * (s_bksiz bytes each) into a n-byte integer. The value of n is given by
- * the value of "s_chkflg". n is preferrably four (4) on a 32-bit CPU.
- * The checksum's are stored at s_vlsiz and beyond, one n-byte value
- * for each logical block. There is a utility program to turn this
- * feature on or off.
- */
- struct sysfile {
- char s_fhnd[16]; /* Filehandler spec */
- daddr_t s_bmadr; /* Bitmap pointer */
- daddr_t s_inadr; /* Inode list pointer */
- daddr_t s_rtadr; /* Root file pointer */
- daddr_t s_swadr; /* Swap area */
- daddr_t s_vlsiz; /* Volume size */
- daddr_t s_bmsiz; /* Bitmap size */
- daddr_t s_swsiz; /* Swap area size */
- daddr_t s_bksiz; /* Block size */
- daddr_t s_disiz; /* Size of a directory entry */
- daddr_t s_insiz; /* Default size of inode list */
- time_t s_time; /* Time initiated */
- char s_fname[8]; /* Filsys name */
- char s_fpack[8]; /* Filsys pack name */
- daddr_t s_[44]; /* Reserved */
- char s_c[2]; /* Reserved */
- char s_ckflg; /* Checksum on this volume */
- char s_chksum; /* Check sum of all bytes */
- };
- #define filsys sysfile /* To make diab and ATT compatible */
- #endif /* _rhSYS_FS_DNIX_SYSFILE */
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