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ufsdump(4)			 File Formats			    ufsdump(4)

NAME
       ufsdump, dumpdates - incremental dump format

SYNOPSIS
       #include <sys/types.h>

       #include <sys/inode.h>

       #include <protocols/dumprestore.h>

       /etc/dumpdates

DESCRIPTION
       Tapes used by ufsdump(1M) and ufsrestore(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 the format of the first record of
       each description in the <protocols/dumprestore.h> include file are:

       #define TP_BSIZE_MAX    65536
       #define TP_BSIZE_MIN    1024
       #define ESIZE_SHIFT_MAX 6

       #ifdef SUPPORTS_MTB_TAPE_FORMAT
       #define TP_BUFSIZE      TP_BSIZE_MAX
       #else
       #define TP_BSIZE	       1024
       #define TP_BUFSIZE      TP_BSIZE
       #endif /* SUPPORTS_MTB_TAPE_FORMAT */

       #define NTREC	       10
       #define HIGHDENSITYTREC 32
       #define CARTRIDGETREC   63
       #define TP_NINDIR       (TP_BSIZE_MIN/2)
       #define TP_NINOS	       (TP_NINDIR / sizeof (long))
       #define LBLSIZE	       16
       #define NAMELEN	       64

       #define OFS_MAGIC       (int)60011
       #define NFS_MAGIC       (int)60012
       #define MTB_MAGIC       (int)60013
       #define CHECKSUM	       (int)84446

       union u_data {
	       char    s_addrs[TP_NINDIR];
	       int32_t s_inos[TP_NINOS];
       };

       union u_shadow {
	       struct s_nonsh {
		       int32_t c_level;
		       char    c_filesys[NAMELEN];
		       char    c_dev[NAMELEN];
		       char    c_host[NAMELEN];
	       } c_nonsh;
	       char    c_shadow[1];
       };

       union u_spcl {
	       char dummy[TP_BUFSIZE];
	       struct  s_spcl {
		       int32_t c_type;
		       time32_t c_date;
		       time32_t c_ddate;
		       int32_t c_volume;
		       daddr32_t c_tapea;
		       ino32_t c_inumber;
		       int32_t c_magic;
		       int32_t c_checksum;
		       struct  dinode  c_dinode;
		       int32_t c_count;
		       union   u_data c_data;
		       char    c_label[LBLSIZE];
		       union   u_shadow c_shadow;
		       int32_t c_flags;
		       int32_t c_firstrec;
       #ifdef SUPPORTS_MTB_TAPE_FORMAT
		       int32_t c_tpbsize;
		       int32_t c_spare[31];
       #else
		       int32_t c_spare[32];
       #endif /* SUPPORTS_MTB_TAPE_FORMAT */
       } s_spcl;
       } u_spcl;

       int32_t			  c_type;
       time32_t			  c_date;
       time32_t			  c_ddate;
       int32_t			  c_volume;
       daddr32_t		  c_tapea;
       ino32_t			  c_inumber;
       int32_t			  c_magic;
       int32_t			  c_checksum;
       struct dinode		  c_dinode;
       int32_t			  c_count;
       union			  u_data c_data;
       char			  c_label[LBLSIZE];
       union			  u_shadow c_shadow;
       int32_t			  c_flags;
       int32_t			  c_firstrec;
       #ifdef SUPPORTS_MTB_TAPE_FORMAT
       int32_t			  c_tpbsize;
       int32_t			  c_spare[31];
       #else
       int32_t			  c_spare[32];
       #endif			    /*
	    SUPPORTS_MTB_TAPE_FORMAT */

	  } s_spcl;
       } u_spcl;
       #define spcl u_spcl.s_spcl
       #define c_addr c_data.s_addrs
       #define c_inos c_data.s_inos
       #define c_level c_shadow.c_nonsh.c_level
       #define c_filesys c_shadow.c_nonsh.c_filesys
       #define c_dev c_shadow.c_nonsh.c_dev
       #define c_host c_shadow.c_nonsh.c_host

       #define TS_TAPE	       1
       #define TS_INODE	       2
       #define TS_ADDR	       4
       #define TS_BITS	       3
       #define TS_CLRI	       6
       #define TS_END	       5
       #define TS_EOM	       7

       #define DR_NEWHEADER    1
       #define DR_INODEINFO    2
       #define DR_REDUMP       4
       #define DR_TRUEINC      8
       #define DR_HASMETA      16

       This header describes three formats for the  ufsdump/ufsrestore	inter‐
       face:

	 ·  An	old  format,  non-MTB, that supports dump sizes of less than 2
	    terabytes. This format is represented by NFS_MAGIC.

	 ·  A new format, MTB, that supports dump sizes of greater than 2 ter‐
	    abytes   using   a	variable  block	 size  and  2  new  constants:
	    TP_BSIZE_MIN and  TP_BSIZE_MAX.  This  format  is  represented  by
	    MTB_MAGIC.

	 ·  A  much older format that might be found on existing backup tapes.
	    The ufsrestore command can restore tapes of this  format,  but  no
	    longer generates tapes of this format. Backups in this format have
	    the OFS_MAGIC magic number in their tape headers.

       The constants are described as follows:

       TP_BSIZE		       Size of file blocks on the dump tapes  for  the
			       old format. Note that TP_BSIZE must be a multi‐
			       ple of DEV_BSIZE This is applicable  for	 dumps
			       of  type	 NFS_MAGIC  or	OFS_MAGIC,  but is not
			       applicable for dumps of type MTB_MAGIC.

       TP_BSIZE_MIN	       Minimum size of file blocks on the  dump	 tapes
			       for the new MTB format (MTB_MAGIC) only.

       TP_BSIZE_MAX	       Maximum	size  of file blocks on the dump tapes
			       for the new MTB format (MTB_MAGIC) only.

       NTREC		       Number of TP_BSIZE blocks that are  written  in
			       each tape record.

       HIGHDENSITYNTREC	       Number  of  TP_BSIZE blocks that are written in
			       each tape record on  6250 BPI or higher density
			       tapes.

       CARTRIDGETREC	       Number  of  TP_BSIZE blocks that are written in
			       each tape record on cartridge tapes.

       TP_NINDIR	       Number of indirect pointers in  a  TS_INODE  or
			       TS_ADDR record. It must be a power of 2.

       TP_NINOS		       The maximum number of volumes on a tape.

       LBLSIZE		       The maximum size of a volume label.

       NAMELEN		       The maximum size of a host's name.

       OFS_MAGIC	       Magic number that is used for the very old for‐
			       mat.

       NFS_MAGIC	       Magic number that is used for the non-MTB  for‐
			       mat.

       MTB_MAGIC	       Magic number that is used for the MTB format.

       CHECKSUM		       Header records checksum to this value.

       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_ADDR	       A subrecord of a file description. See s_addrs below.

       TS_BITS	       A bit map follows. This bit map has a one bit for  each
		       inode that was dumped.

       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.

       TS_END	       End of tape record.

       TS_EOM	       diskette	  EOMindicates	that the restore is compatible
		       with old dump

       The flags are described as follows:

       DR_NEWHEADER    New format tape header.

       DR_INFODEINFO   Header contains starting inode info.

       DR_REDUMP       Dump contains recopies of active files.

       DR_TRUEINC      Dump is a "true incremental".

       DR_HASMETA      The metadata in this header.

       DUMPOUTFMT      Name, incon, and ctime (date) for printf.

       DUMPINFMT       Inverse for scanf.

       The fields of the header structure are as follows:

       s_addrs	       An array of bytes describing the blocks of  the	dumped
		       file.   A  byte	is   zero if the block associated with
		       that byte was not present on the	 file  system;	other‐
		       wise,  the  byte	 is  non-zero.	 If  the block was not
		       present on the file lsystem, no block was  dumped;  the
		       block will be stored as a   hole in the file.  If there
		       is not sufficient space in this record to  describe all
		       the  blocks  in	a file,	 TS_ADDR records will be scat‐
		       tered through the file, each one picking up  where  the
		       last left off

       s_inos	       The starting inodes on tape.

       c_type	       The type of the record.

       c_date	       The date of the previous dump.

       c_ddate	       The date of this dump.

       c_volume	       The current volume number of the dump.

       c_tapea	       The logical block of this 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.

       c_count	       The count of bytes in s_addrs.

       u_data c_data   The  union of either  u_data c_data The union of either
		       s_addrs or  s_inos.

       c_label	       Label for this dump.

       c_level	       Level of this dump.

       c_filesys       Name of dumped file system.

       c_dev	       Name of dumped service.

       c_host	       Name of dumped host.

       c_flags	       Additional information.

       c_firstrec      First record on volume.

       c_spare	       Reserved for future uses.

       c_tpbsize       Tape block size for MTB format only.

       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  dump  history  is  kept in the file /etc/dumpdates. It is an ASCII
       file with three fields separated by white space:

	 ·  The name of the device on which the dumped file system resides.

	 ·  The level number of the dump tape; see ufsdump(1M).

	 ·  The date of the  incremental  dump	in  the	 format	 generated  by
	    ctime(3C).

       DUMPOUTFMT is the format to use when using printf(3C) to write an entry
       to /etc/dumpdates; DUMPINFMT is the format to use when using  scanf(3C)
       to read an entry from /etc/dumpdates.

ATTRIBUTES
       See attributes(5) for a description of the following attributes:

       ┌─────────────────────────────┬─────────────────────────────┐
       │      ATTRIBUTE TYPE	     │	    ATTRIBUTE VALUE	   │
       ├─────────────────────────────┼─────────────────────────────┤
       │Stability Level		     │Unstable			   │
       └─────────────────────────────┴─────────────────────────────┘

SEE ALSO
       ufsdump(1M),    ufsrestore(1M),	 ctime(3C),   printf(3C),   scanf(3C),
       types.h(3HEAD), attributes(5),

SunOS 5.10			  9 Apr 2003			    ufsdump(4)
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