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Section: Devices and Network Interfaces (4)
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dumprestor, dumpdates - Incremental dump format  


#include <sys/types.h> #include <ufs/inode.h>  


Tapes used by dump and restore contain:

The format of the header record and of the first record of each description as given in the include file <dumprestor.h> is:
       #define NTREC           10

       #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 NFS_MAGIC       (int) 60012
       #define CHECKSUM        (int) 84446

       #define TP_BSIZE        1024
       #define TP_NINDIR       (TP_BSIZE/2)
       #define LBLSIZE         16
       #define NAMELEN         64
       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;
               char            c_addr[TP_NINDIR];
               char            c_label[LBLSIZE];
               long            c_level;
               char            c_filesys[NAMELEN];
               char            c_dev[NAMELEN];
               char            c_host[NAMELEN];
               long            c_flags;
       } s_spcl;

       struct idates
               char            id_name[NAME_MAX + 3];
               char            id_incno;
               time_t          id_ddate;

       #define DUMPOUTFMT "%-16s %c %s"   /* for printf */
                                       /* name, incno, ctime(date) */
       #define DUMPINFMT  "%16s %c %[^ /* inverse for scanf */

NTREC is the number of TP_BSIZE-byte records in a physical tape block.

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: Tape volume label. 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. A bit map follows. This bit map has a one (1) bit for each inode that was dumped. A subrecord of a file description. See c_addr described in the next list. End of tape record. A bit map follows. This bit map contains a zero bit for all inodes that were empty on the file system when dumped. All header records have this number in c_magic. Header records checksum to this value.

The fields of the header structure are as follows: The type of the header. The date of the dump. The date of the previous dump to the file system. The current volume number of the dump. The current number of this (1024-byte) record. The number of the inode being dumped if this is of type TS_INODE. This contains the value MAGIC above, truncated as needed. This contains whatever value is needed to make the record sum to CHECKSUM. This is a copy of the inode as it appears on the file system. For further information, see fs(4). The count of characters in 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 nonzero. 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. The label of the dump. The level number of the dump. The name of the file system. The name of the device. The name of the host. Additional information such as whether the dump uses the format tape header described here.

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 structure idates describes an entry in the file /etc/dumpdates where dump history is kept. The fields of the structure are: The dumped filesystem is `/dev/id_nam'. The level number of the dump tape. For further information, see dump(8). The date of the incremental dump in system format.  




fs(4), dump(8), restore(8) delim off




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Time: 02:40:06 GMT, October 02, 2010