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DUMP(5)								       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(1) 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:

       NTREC is the number of 512 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 (512-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 associated 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.

       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.  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(1).
       id_ddate The  date  of  the  incremental	 dump  in  system  format  see
		types(5).

FILES
       /etc/ddate

SEE ALSO
       dump(1), dumpdir(1), restor(1), filsys(5), types(5)

								       DUMP(5)
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