DUMP(5) GENIX Programmer's Manual DUMP(5)
NAME
dump, ddate - incremental dump format
SYNOPSIS
#include <sys/types.h>
#include <sys/ino.h>
#include <dumprestor.h>
DESCRIPTION
Tapes used by dump and restor(8) contain:
a header record
two groups of bit map records
a group of records describing directories
a group of records describing files
The format of the header record and of the first record of each
description as given in the include file <dumprestor.h> is:
#define NTREC 20
#define MLEN 16
#define MSIZ 4096
#define TS_TAPE 1
#define TS_INODE 2
#define TS_BITS 3
#define TS_ADDR 4
#define TS_END 5
#define TS_CLRI 6
#define MAGIC (int) 60011
#define CHECKSUM (int) 84446
struct spcl {
int c_type;
time_t c_date;
time_t c_ddate;
int c_volume;
daddr_t c_tapea;
ino_t c_inumber;
int c_magic;
int c_checksum;
struct dinode c_dinode;
int c_count;
char c_addr[BSIZE];
} spcl;
struct idates {
char id_name[16];
char id_incno;
time_t id_ddate;
};
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DUMP(5) GENIX Programmer's Manual DUMP(5)
#define DUMPOUTFMT "%-16s %c %s" /* for printf */
/* name, incno, ctime(date) */
#define DUMPINFMT "%16s %c %[^\n]\n" /* inverse for scanf */
NTREC is the number of 1024 byte records in a physical tape block.
MLEN is the number of bits in a bit map word. MSIZ is the number of
bit map words.
The TS_ entries are used in the c_type field to indicate what sort
of header this is. The types and their meanings are as follows:
TS_TAPE Tape volume label
TS_INODE A file or directory follows. The c_dinode field is a
copy of the disk inode and contains bits telling what
sort of file this is.
TS_BITS A bit map follows. This bit map has a one bit for each
inode that was dumped.
TS_ADDR A subrecord of a file description. See c_addr below.
TS_END End of tape record.
TS_CLRI A bit map follows. This bit map contains a zero bit
for all inodes that were empty on the file system when
dumped.
MAGIC All header records have this number in c_magic.
CHECKSUM Header records checksum to this value.
The fields of the header structure are as follows:
c_type The type of the header.
c_date The date the dump was taken.
c_ddate The date the file system was dumped from.
c_volume The current volume number of the dump.
c_tapea The current number of this (1024-byte) record.
c_inumber The number of the inode being dumped if this is of type
TS_INODE.
c_magic This contains the value MAGIC above, truncated as
needed.
c_checksum This contains whatever value is needed to make the
record sum to CHECKSUM.
c_dinode This is a copy of the inode as it appears on the file
system; see filsys(5).
c_count The count of characters in c_addr.
c_addr An array of characters describing the blocks of the
dumped file. A character is zero if the block associ-
ated with that character was not present on the file
system, otherwise the character is non-zero. If the
block was not present on the file system, no block was
dumped; the block will be restored as a hole in the
file. If there is not sufficient space in this record
to describe all of the blocks in a file, TS_ADDR
records will be scattered through the file, each one
picking up where the last left off.
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DUMP(5) GENIX Programmer's Manual DUMP(5)
Each volume except the last ends with a tapemark (read as an end of
file). The last volume ends with a TS_END record and then the tape-
mark.
The structure idates describes an entry of the file /etc/ddate where
dump history is kept. N.B.: /etc/ddate is obsoleted by
/etc/dumpdates (see dump(8)). The fields of the structure are:
id_name The dumped filesystem is `/dev/id_nam'.
id_incno The level number of the dump tape; see dump(8).
id_ddate The date of the incremental dump in system format see
types(5).
FILES
/etc/ddate /etc/dumpdates
SEE ALSO
dump(8), dumpdir(8), restor(8), filsys(5), types(5)
Printed 11/16/83 3