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 of the first record of each description as given in the include file <protocols/dumprestore.h> is:
| #define TP_BSIZE | 1024 |
| #define NTREC | 10 |
| #define HIGHDENSITYTREC | 32 |
| #define CARTRIDGETREC | 63 |
| #define TP_NINDIR | (TP_BSIZE/2) |
| #define TP_NINOS | (TP_NINDIR / sizeop (long)) |
| #define LBLSIZE | 16 |
| #define NAMELEN | 64 |
| #define NFS_MAGIC | (int)60012 |
| #define CHECKSUM | (int)84446 |
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;
#define spcl u_spcl.s_spcl
#define c_addr c_data.s_addrs
#define c_inos cdata.s_inos
| #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_TRUELIC | 8 |
| #define DUMPOUTFMT | "%-24s %c %s" |
| #define DUMPINFMT | "%24s %c %[^\n]\n" |
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(3S) to write an entry to /etc/dumpdates; DUMPINFMT is the format to use when using scanf(3S) to read an entry from /etc/dumpdates.
SEE ALSO
ufsdump(1M), ufsrestore(1M), ctime(3C), printf(3S), scanf(3S), types(5)
SunOS 5.4 — Last change: 7 Jan 1994