4BSD/usr/man/cat5/dump.5
DUMP(5) UNIX Programmer's Manual DUMP(5)
NAME
dump, ddate - incremental dump format
SYNOPSIS
#include <sys/types.h>
#include <sys/ino.h>
#include <dumprestor.h>
DESCRIPTION
Tapes used by _d_u_m_p and _r_e_s_t_o_r(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 <_d_u_m_p_r_e_s_t_o_r._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;
};
Printed 11/10/80 1
DUMP(5) UNIX Programmer's Manual DUMP(5)
#define DUMPOUTFMT "%-16s %c %s" /* for printf */
/* name, incno, ctime(date) */
#define DUMPINFMT "%16s %c %[^\n]\n" /* inverse for scanf */
_N_T_R_E_C is the number of 1024 byte records in a physical tape
block. _M_L_E_N is the number of bits in a bit map word. _M_S_I_Z
is the number of bit map words.
The _T_S_ entries are used in the _c__t_y_p_e 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__d_i_n_o_d_e
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__a_d_d_r
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__m_a_g_i_c.
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 _T_S__I_N_O_D_E.
c_magic This contains the value _M_A_G_I_C above, truncated
as needed.
c_checksum This contains whatever value is needed to make
the record sum to _C_H_E_C_K_S_U_M.
c_dinode This is a copy of the inode as it appears on
the file system; see _f_i_l_s_y_s(5).
c_count The count of characters in _c__a_d_d_r.
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 char-
acter 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
Printed 11/10/80 2
DUMP(5) UNIX Programmer's Manual DUMP(5)
file, _T_S__A_D_D_R 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 _T_S__E_N_D record and
then the tapemark.
The structure _i_d_a_t_e_s describes an entry of the file
/_e_t_c/_d_d_a_t_e where dump history is kept. The fields of the
structure are:
id_name The dumped filesystem is `/dev/_i_d__n_a_m'.
id_incno The level number of the dump tape; see _d_u_m_p(1).
id_ddate The date of the incremental dump in system format
see _t_y_p_e_s(5).
FILES
/etc/ddate
SEE ALSO
dump(8), dumpdir(8), restor(8), filsys(5), types(5)
Printed 11/10/80 3