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dump(5) [bsd man page]

DUMP(5) 							File Formats Manual							   DUMP(5)

dump, ddate - incremental dump format SYNOPSIS
#include <sys/types.h> #include <sys/ino.h> #include <dumprestor.h> DESCRIPTION
Tapes used by dump and restor(8) 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 <dumprestor.h> is: #if UCB_NKB == 1 #define NTREC 10 #endif #ifndef UCB_NKB #define NTREC 20 #endif #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 dinodec_dinode; int c_count; char c_addr[BSIZE]; } spcl; struct idates { char id_name[16]; char id_incno; time_t id_ddate; }; NTREC is the number of BSIZE (sys/param.h) byte records in a physical tape block. MLEN is the number of bits in a bit map word. MSIZ is the number of bit map words. 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_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 file system 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 file system was dumped from. c_volume The current volume number of the dump. c_tapea The current number of this (512-byte) 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; see filsys(5). 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 file system, otherwise the character 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 file, TS_ADDR 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 TS_END record and then the tape- mark. The structure idates describes an entry of the file /etc/ddate where dump history is kept. The fields of the structure are: id_name The dumped file system is `/dev/id_nam'. id_incno The level number of the dump tape; see dump(8). id_ddate The date of the incremental dump in system format see types(5). FILES
/etc/ddate SEE ALSO
filsys(5), types(5), dump(8), dumpdir(8), restor(8) 3rd Berkeley Distribution DUMP(5)
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