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dump(5)								       dump(5)

NAME    [Toc]    [Back]

     dump, dumpdates - incremental dump	format

SYNOPSIS    [Toc]    [Back]

     #include <sys/types.h>
     #include <protocols/dumprestore.h>

DESCRIPTION    [Toc]    [Back]

     Tapes used	by dump	and restore(1M)	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 <protocols/dumprestore.h>	is:

	  #define TP_BSIZE		  1024
	  #define NTREC		 10
	  #define LBLSIZE	 16
	  #define NAMELEN	 64

	  #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 bsd_dinode	   c_dinode;
		  int		  c_count;
		  char		  c_addr[TP_BSIZE/2];
		  char		  c_label[LBLSIZE];
		  long		  c_level;
		  char		  c_filesys[NAMELEN];
		  char		  c_dev[NAMELEN];
		  long		  c_flags;
	  } spcl;

									Page 1

dump(5)								       dump(5)

	  struct idates	{
		  char		  id_name[255];
		  char		  id_incno;
		  time_t	  id_ddate;

	  #define DUMPOUTFMT "%-16s %c %s"
	  #define DUMPINFMT  "%[^ ] %c %[^\n]\n"

     TP_BSIZE is the size of file blocks on the	dump tapes.  NTREC is the
     default number of 1024 byte records in a physical tape block (blocking

     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 indicating the type of
		  the file.
     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	filesystem 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 filesystem 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
     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 filesystem.
		  Extent File System (see fs(4)) disk inodes differ from the
		  Berkeley Fast	File System inode format.  Dump	converts EFS
		  disk inodes to Berkeley's format, before dumping them	on
     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 filesystem, otherwise the
		  character is non-zero.  If the block was not present on the

									Page 2

dump(5)								       dump(5)

		  filesystem, 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.
     c_label	  Dump label.
     c_level	  Level	of this	dump.  See dump(1M).
     c_filesys	  Name of the dumped filesystem.
     c_dev	  Name of the dump device.
     c_host	  Name of the dumped host.
     c_flags	  Additional information.

     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 tapemark.

     The structure idates describes an entry in	the file /etc/dumpdates	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(1M).
     id_ddate The date of the incremental dump in system format	see types(5).

FILES    [Toc]    [Back]


SEE ALSO    [Toc]    [Back]

     dump(1M), restore(1M), fs(4), types(5)

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