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Annotation of coherent/d/bin/dump/dumptape.h, revision 1.1

1.1     ! root        1: /*
        !             2:  * Dump tapes.
        !             3:  * A dump tape begins with a header
        !             4:  * record. This contains the attributes of the
        !             5:  * tape.
        !             6:  * The remainder of the tape is filled with
        !             7:  * arrays of dumpdata records. The map comes first,
        !             8:  * then all the directories, then all the files.
        !             9:  */
        !            10: #ifndef  TYPES_H
        !            11: #include <sys/types.h>
        !            12: #endif
        !            13: #ifndef  DIR_H
        !            14: #include <sys/dir.h>
        !            15: #endif
        !            16: #ifndef  INO_H
        !            17: #include <sys/ino.h>
        !            18: #endif
        !            19: 
        !            20: /*
        !            21:  * Dump tape header.
        !            22:  * All entries are in cannonical
        !            23:  * format on the tape.
        !            24:  */
        !            25: struct dumpheader
        !            26: {
        !            27:        int     dh_magic;               /* Magic number */
        !            28:        ino_t   dh_nino;                /* # of inodes on file system */
        !            29:        time_t  dh_bdate;               /* Date at beginning of dump */
        !            30:        time_t  dh_ddate;               /* Dump since date */
        !            31:        int     dh_level;               /* Dump level */
        !            32:        int     dh_reel;                /* Reel number in dump */
        !            33:        fsize_t dh_nbyte;               /* Length of disc */
        !            34:        int     dh_blocking;            /* Blocking factor */
        !            35:        char    dh_dev[DIRSIZ];         /* Name of dumped device */
        !            36:        char    dh_fname[6];            /* File system name */
        !            37:        char    dh_fpack[6];            /* File system pack name */
        !            38:        int     dh_checksum;            /* Byte checksum */
        !            39: };
        !            40: 
        !            41: #define        DH_MAG  0123456                 /* Magic number */
        !            42: 
        !            43: /*
        !            44:  * Dump data blocks.
        !            45:  * These are all a big union.
        !            46:  * They are packed into much larger
        !            47:  * blocks on the tape.
        !            48:  */
        !            49: union  dumpdata
        !            50: {
        !            51:        struct  {
        !            52:                int     dd_type;        /* Type = DD_EOT */
        !            53:        } dumpdata1;
        !            54:        struct  {
        !            55:                int     dd_type;        /* Type = DD_DATA */
        !            56:                ino_t   dd_ino;         /* Inode number */
        !            57:                daddr_t dd_block;       /* Block number in file */
        !            58:                int     dd_size;        /* Bytes used in this block */
        !            59:                char    dd_data[BUFSIZ];/* Data */
        !            60:        } dumpdata2;
        !            61:        struct  {
        !            62:                int     dd_type;        /* Type = DD_INO */
        !            63:                ino_t   dd_ino;         /* Inode number */
        !            64:                struct  dinode dd_dinode; /* On disc inode */
        !            65:        } dumpdata3;
        !            66:        struct  {
        !            67:                int     dd_type;        /* Type = DD_MAP */
        !            68:                ino_t   dd_ino;         /* Base inode of this map block */
        !            69:                int     dd_nmap;        /* # of map entries */
        !            70:                char    dd_map[BUFSIZ]; /* Some map */
        !            71:        } dumpdata4;
        !            72: };
        !            73: 
        !            74: #define        DD_EOT  0                       /* End of dump */
        !            75: #define        DD_INO  1                       /* Inode */
        !            76: #define        DD_DATA 2                       /* Data block */
        !            77: #define        DD_MAP  3                       /* Map */
        !            78: 
        !            79: #define        DD_BUSY 01                      /* Inode in use */
        !            80: #define        DD_DUMP 02                      /* Inode dumped */
        !            81: #define        DD_DIR  04                      /* Inode is a directory */
        !            82: #define        DD_DEJA 010                     /* Already seen flag (dump) */
        !            83: #define        DD_HERE (DD_BUSY|DD_DUMP)       /* On the tape */
        !            84: 
        !            85: /*
        !            86:  * This structure is used
        !            87:  * to hold the dump dates in the
        !            88:  * file `/etc/ddate'.
        !            89:  */
        !            90: struct idates
        !            91: {
        !            92:        char    id_name[DIRSIZ];        /* Device name */
        !            93:        int     id_incno;               /* Level */
        !            94:        time_t  id_ddate;               /* The date of the dump */
        !            95: };
        !            96: 
        !            97: #define        DDATE   "/etc/ddate"            /* Date file name */
        !            98: #define        DTAPE   "/dev/dump"             /* Default dump tape */
        !            99: #define        DFSYS   ""                      /* No default file system */

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