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dump(5)								       dump(5)

Name
       dumprestor, dumpdates - incremental dump format

Syntax
       #include <sys/types.h>
       #include <sys/inode.h>
       #include <dumprestor.h>

Description
       Tapes used by and 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	   10
       #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;
       };

       #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 (1) bit for
		    each inode that was dumped.
       TS_ADDR	    A subrecord of a file description.	See  c_addr  described
		    in the next list.
       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 sys‐
		    tem.  For further information, see
       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; other‐
		    wise the character is  nonzero.   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 in the file 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.  For further information,
		see
       id_ddate The date of the incremental dump in system format.   For  fur‐
		ther information, see

Files
See Also
       fs(5), types(5), dump(8), restore(8)

								       dump(5)
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