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 of the first record of each description as given in the include file <protocols/dumprestore.h> is:

union u_data { char s_addrs[TP_NINDIR]; long s_inos[TP_NINOS]; union u_spcl { char dummy[TP_BSIZE]; struct s_spcl { long c_type; time_t c_date; time_t c_ddate; long c_volume; daddr_t c_tapea; ino_t c_inumber; long c_magic; long c_checksum; struct dinode c_dinode; long c_count; union u_data c_data; char c_label[LBLSIZE]; long c_level; char c_filesys[NAMELEN]; char c_dev[NAMELEN]; char c_host[NAMELEN]; long c_flags; long c_firstrec; long c_spare[32]; } s_spcl; } u_spcl;

} s_spcl; } u_spcl; #define spcl u_spcl.s_spcl #define c_addr c_data.s_addrs #define c_inos cdata.s_inos

The constants are described as follows:

TP_BSIZE

Size of file blocks on the dump tapes. Note that TP_BSIZE must be a multiple of DEV_BSIZE.

NTREC

Default number of TP_BSIZE byte records in a physical tape block, changeable by the b option to ufsdump(1M).

HIGHDENSITYNTREC

Default number of TP_BSIZE byte records in a physical tape block on 6250 BPI or higher density tapes.

CARTRIDGETREC

Default number of TP_BSIZE records in a physical tape block 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. Used for tape labeling in hsmdump and hsmrestore (available with Online:Backup 2.0 optional software package SUNWhsm).

LBLSIZE

The maximum size of a volume label. Used for tape labeling in hsmdump and hsmrestore (available with Online:Backup 2.0 optional software package SUNWhsm).

NAMELEN

The maximum size of a host's name.

NFS_MAGIC

All header records have this number in c_magic.

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

floppy EOM -- restore compat 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".

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; otherwise, 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 scattered 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.

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.

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

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