1DUMP(5) File Formats Manual DUMP(5)
2
6 dump, ddate - incremental dump format
7
9 #include <sys/types.h>
10 #include <sys/ino.h>
11 # include <dumprestor.h>
12
14 Tapes used by dump and restor(1) contain:
15 a header record
17 two groups of bit map records
18 a group of records describing directories
19 a group of records describing files
20 The format of the header record and of the first record of each
22 description as given in the include file <dumprestor.h> is:
23 NTREC is the number of 512 byte records in a physical tape block. MLEN
25 is the number of bits in a bit map word. MSIZ is the number of bit map
26 words.
27 The TS_ entries are used in the c_type field to indicate what sort of
29 header this is. The types and their meanings are as follows:
30 TS_TAPE Tape volume label
32 TS_INODE
33 A file or directory follows. The c_dinode field is a copy of
34 the disk inode and contains bits telling what sort of file this
35 is.
36 TS_BITS A bit map follows. This bit map has a one bit for each inode
37 that was dumped.
38 TS_ADDR A subrecord of a file description. See c_addr below.
39 TS_END End of tape record.
40 TS_CLRI A bit map follows. This bit map contains a zero bit for all
41 inodes that were empty on the file system when dumped.
42 MAGIC All header records have this number in c_magic.
43 CHECKSUM
44 Header records checksum to this value.
45 The fields of the header structure are as follows:
47 c_type The type of the header.
49 c_date The date the dump was taken.
50 c_ddate The date the file system was dumped from.
51 c_volume The current volume number of the dump.
52 c_tapea The current number of this (512-byte) record.
53 c_inumber
54 The number of the inode being dumped if this is of type
55 TS_INODE.
56 c_magic This contains the value MAGIC above, truncated as needed.
57 c_checksum
58 This contains whatever value is needed to make the record sum
59 to CHECKSUM.
60 c_dinode This is a copy of the inode as it appears on the file system;
61 see filsys(5).
62 c_count The count of characters in c_addr.
63 c_addr An array of characters describing the blocks of the dumped
64 file. A character is zero if the block associated with that
65 character was not present on the file system, otherwise the
66 character is non-zero. If the block was not present on the
67 file system, no block was dumped; the block will be restored
68 as a hole in the file. If there is not sufficient space in
69 this record to describe all of the blocks in a file, TS_ADDR
70 records will be scattered through the file, each one picking
71 up where the last left off.
72 Each volume except the last ends with a tapemark (read as an end of
74 file). The last volume ends with a TS_END record and then the tape‐
75 mark.
76 The structure idates describes an entry of the file /etc/ddate where
78 dump history is kept. The fields of the structure are:
79 id_name The dumped filesystem is `/dev/id_nam'.
81 id_incno The level number of the dump tape; see dump(1).
82 id_ddate The date of the incremental dump in system format see
83 types(5).
84
86 /etc/ddate
87
89 dump(1), dumpdir(1), restor(1), filsys(5), types(5)
90 DUMP(5)