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dumpdates (4)
  • >> dumpdates (4) ( Solaris man: Специальные файлы /dev/* )
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    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:

    o a header record
    o two groups of bit map records
    o a group of records describing directories
    o a group of records describing files

    The format of the header record and the format of the first record of each description in the <protocols/dumprestore.h> include file are:

    #define TP_BSIZE_MAX    65536
    #define TP_BSIZE_MIN    1024
    #define ESIZE_SHIFT_MAX 6 
    
    #ifdef SUPPORTS_MTB_TAPE_FORMAT
    #define TP_BUFSIZE      TP_BSIZE_MAX
    #else
    #define TP_BSIZE        1024
    #define TP_BUFSIZE      TP_BSIZE
    #endif /* SUPPORTS_MTB_TAPE_FORMAT */
    
    #define NTREC           10
    #define HIGHDENSITYTREC 32
    #define CARTRIDGETREC   63
    #define TP_NINDIR       (TP_BSIZE_MIN/2)
    #define TP_NINOS        (TP_NINDIR / sizeof (long))
    #define LBLSIZE         16
    #define NAMELEN         64
    
    #define OFS_MAGIC       (int)60011
    #define NFS_MAGIC       (int)60012
    #define MTB_MAGIC       (int)60013
    #define CHECKSUM        (int)84446
    

    union u_data {
           char    s_addrs[TP_NINDIR];
           int32_t s_inos[TP_NINOS];
    };
    
    union u_shadow {
           struct s_nonsh {
                   int32_t c_level;
                   char    c_filesys[NAMELEN];
                   char    c_dev[NAMELEN];
                   char    c_host[NAMELEN];
           } c_nonsh;
           char    c_shadow[1];
    };
    
    union u_spcl {
           char dummy[TP_BUFSIZE];
           struct  s_spcl {
                   int32_t c_type; 
                   time32_t c_date; 
                   time32_t c_ddate; 
                   int32_t c_volume;
                   daddr32_t c_tapea;
                   ino32_t c_inumber; 
                   int32_t c_magic; 
                   int32_t c_checksum;
                   struct  dinode  c_dinode;
                   int32_t c_count;  
                   union   u_data c_data; 
                   char    c_label[LBLSIZE];
                   union   u_shadow c_shadow; 
                   int32_t c_flags;    
                   int32_t c_firstrec;        
    #ifdef SUPPORTS_MTB_TAPE_FORMAT
                   int32_t c_tpbsize;  
                   int32_t c_spare[31]; 
    #else
                   int32_t c_spare[32];
    #endif /* SUPPORTS_MTB_TAPE_FORMAT */
    } s_spcl;
    } u_spcl;
    

    int32_t                    c_type;
    time32_t                   c_date;
    time32_t                   c_ddate;
    int32_t                    c_volume;
    daddr32_t                  c_tapea;
    ino32_t                    c_inumber;
    int32_t                    c_magic;
    int32_t                    c_checksum;
    struct dinode              c_dinode;
    int32_t                    c_count;
    union                      u_data c_data;
    char                       c_label[LBLSIZE];
    union                      u_shadow c_shadow;
    int32_t                    c_flags;
    int32_t                    c_firstrec;
    #ifdef SUPPORTS_MTB_TAPE_FORMAT
    int32_t                    c_tpbsize;
    int32_t                    c_spare[31];
    #else
    int32_t                    c_spare[32];
    #endif                       /*
        SUPPORTS_MTB_TAPE_FORMAT */
    

       } s_spcl;
    } u_spcl;
    #define spcl u_spcl.s_spcl
    #define c_addr c_data.s_addrs
    #define c_inos c_data.s_inos
    #define c_level c_shadow.c_nonsh.c_level
    #define c_filesys c_shadow.c_nonsh.c_filesys
    #define c_dev c_shadow.c_nonsh.c_dev
    #define c_host c_shadow.c_nonsh.c_host
    

    #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_TRUEINC      8
    #define DR_HASMETA      16
    

    This header describes three formats for the ufsdump/ufsrestore interface:

    o An old format, non-MTB, that supports dump sizes of less than 2 terabytes. This format is represented by NFS_MAGIC.
    o A new format, MTB, that supports dump sizes of greater than 2 terabytes using a variable block size and 2 new constants: TP_BSIZE_MIN and TP_BSIZE_MAX. This format is represented by MTB_MAGIC.
    o A much older format that might be found on existing backup tapes. The ufsrestore command can restore tapes of this format, but no longer generates tapes of this format. Backups in this format have the OFS_MAGIC magic number in their tape headers.

    The constants are described as follows:

    TP_BSIZE

    Size of file blocks on the dump tapes for the old format. Note that TP_BSIZE must be a multiple of DEV_BSIZE This is applicable for dumps of type NFS_MAGIC or OFS_MAGIC, but is not applicable for dumps of type MTB_MAGIC.

    TP_BSIZE_MIN

    Minimum size of file blocks on the dump tapes for the new MTB format (MTB_MAGIC) only.

    TP_BSIZE_MAX

    Maximum size of file blocks on the dump tapes for the new MTB format (MTB_MAGIC) only.

    NTREC

    Number of TP_BSIZE blocks that are written in each tape record.

    HIGHDENSITYNTREC

    Number of TP_BSIZE blocks that are written in each tape record on 6250 BPI or higher density tapes.

    CARTRIDGETREC

    Number of TP_BSIZE blocks that are written in each tape record 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.

    LBLSIZE

    The maximum size of a volume label.

    NAMELEN

    The maximum size of a host's name.

    OFS_MAGIC

    Magic number that is used for the very old format.

    NFS_MAGIC

    Magic number that is used for the non-MTB format.

    MTB_MAGIC

    Magic number that is used for the MTB format.

    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

    diskette EOMindicates that the restore is compatible 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".

    DR_HASMETA

    The metadata in this header.

    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.

    c_tpbsize

    Tape block size for MTB format only.

    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:

    o The name of the device on which the dumped file system resides.
    o The level number of the dump tape; see ufsdump(1M).
    o The date of the incremental dump in the format generated by ctime(3C).

    DUMPOUTFMT is the format to use when using printf(3C) to write an entry to /etc/dumpdates; DUMPINFMT is the format to use when using scanf(3C) to read an entry from /etc/dumpdates.  

    ATTRIBUTES

    See attributes(5) for a description of the following attributes:

    ATTRIBUTE TYPEATTRIBUTE VALUE

    Stability LevelUnstable

     

    SEE ALSO

    ufsdump(1M), ufsrestore(1M), ctime(3C), printf(3C), scanf(3C), types.h(3HEAD), attributes(5),


     

    Index

    NAME
    SYNOPSIS
    DESCRIPTION
    ATTRIBUTES
    SEE ALSO


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