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Annotation of researchv10dc/lsys/sys/netb.h, revision 1.1

1.1     ! root        1: /*
        !             2:  * network filesystem protocol
        !             3:  *
        !             4:  * messages are character arrays,
        !             5:  * encoding structures of characters,
        !             6:  * two-byte shorts, and four-byte longs.
        !             7:  * shorts and longs have a specific byte order,
        !             8:  * and should be accessed through the macros below.
        !             9:  */
        !            10: 
        !            11: /*
        !            12:  * general numbers
        !            13:  */
        !            14: #define        NETB    2       /* protocol version */
        !            15: #define        NBMAXMSG        (5*1024)        /* max message size */
        !            16: #define        NBROOTTAG       0       /* i_tag assumed for the root */
        !            17: 
        !            18: 
        !            19: /*
        !            20:  * turn network numbers into host numbers
        !            21:  * unsigned char *p
        !            22:  */
        !            23: #define        frnetlong(p, off)       (p[off+0]+(p[off+1]<<8)+((long)p[off+2]<<16)+((long)p[off+3]<<24))
        !            24: #define        frnetshort(p, off)      (p[off+0]+(p[off+1]<<8))
        !            25: #define        frnetchar(p, off)       p[off]
        !            26: 
        !            27: /*
        !            28:  * turn host numbers to network numbers
        !            29:  */
        !            30: 
        !            31: #define        tonetlong(p, off, l)    (p[off+0]=(l), p[off+1]=(l)>>8, p[off+2]=(l)>>16, p[off+3]=(l)>>24)
        !            32: #define        tonetshort(p, off, s)   (p[off+0]=(s), p[off+1]=(s)>>8)
        !            33: #define        tonetchar(p, off, c)    (p[off]=c)
        !            34: 
        !            35: /*
        !            36:  * messages from client to server
        !            37:  */
        !            38: 
        !            39: /*
        !            40:  * general header
        !            41:  */
        !            42: 
        !            43: #define        SNB_VERSION     0       /* (char) version */
        !            44: #define        SNB_CMD         1       /* (char) command; see below */
        !            45: #define        SNB_FLAGS       2       /* (char) mostly for nami */
        !            46: /* one byte of padding */
        !            47: #define        SNB_TRANNUM     4       /* (long) unique transaction ID */
        !            48: #define        SNB_LEN         8       /* (long) including header and any data */
        !            49: #define        SNB_TAG         12      /* (long) which file this is about */
        !            50: #define        SNB_UID         16      /* (short) who wants to do IO */
        !            51: #define        SNB_GID         18      /* (short) ditto */
        !            52: /* four more bytes of junk */
        !            53: #define        SNBSIZE         24
        !            54: 
        !            55: /*
        !            56:  * commands
        !            57:  */
        !            58: #define        NBPUT   1       /* put file */
        !            59: /* 2 was NAGET */
        !            60: #define        NBUPD   3       /* update attributes */
        !            61: #define        NBREAD  4       /* read data */
        !            62: #define        NBWRT   5       /* write data */
        !            63: #define        NBNAMI  6       /* translate name (with many side effects) */
        !            64: #define        NBSTAT  7       /* read file status */
        !            65: #define        NBIOCTL 8       /* ioctl */
        !            66: #define        NBTRNC  9       /* truncate */
        !            67: #define        NBDIR   10      /* directory read */
        !            68: 
        !            69: /*
        !            70:  * flags, for namei sub-function code,
        !            71:  * are defined in inode.h
        !            72:  * should they be here too?
        !            73:  */
        !            74: 
        !            75: /*
        !            76:  * additional data for each command
        !            77:  */
        !            78: 
        !            79: /*
        !            80:  * update
        !            81:  */
        !            82: #define        SUP_MODE        (SNBSIZE+0)     /* (short) new mode */
        !            83: /* two bytes for raw device (mknod) */
        !            84: /* four bytes of junk */
        !            85: #define        SUP_ATIME       (SNBSIZE+8)     /* (long) access time */
        !            86: #define        SUP_MTIME       (SNBSIZE+12)    /* (long) mod time */
        !            87: #define        SUPSIZE         (SNBSIZE+16)
        !            88: 
        !            89: /*
        !            90:  * read, dirread
        !            91:  */
        !            92: #define        SRD_LEN         (SNBSIZE+0)     /* (long) how much to read */
        !            93: #define        SRD_OFFSET      (SNBSIZE+4)     /* (long) file offset */
        !            94: #define        SRDSIZE         (SNBSIZE+8)
        !            95: 
        !            96: /*
        !            97:  * write
        !            98:  */
        !            99: #define        SWR_LEN         (SNBSIZE+0)     /* (long) how much to write */
        !           100: #define        SWR_OFFSET      (SNBSIZE+4)     /* (long) where to write it */
        !           101: #define        SWRSIZE         (SNBSIZE+8)
        !           102: /* data to be written follows immediately */
        !           103: 
        !           104: /*
        !           105:  * namei
        !           106:  */
        !           107: #define        SNM_MODE        (SNBSIZE+0)     /* (short) mode for creat */
        !           108: #define        SNM_DEV         (SNBSIZE+2)     /* (short) device (mknod); used? */
        !           109: #define        SNM_INO         (SNBSIZE+4)     /* (long) i-number, for link */
        !           110: #define        SNMSIZE         (SNBSIZE+8)
        !           111: /* name to be translated follows immediately */
        !           112: 
        !           113: /*
        !           114:  * SNB_FLAGS: namei function codes
        !           115:  * these must match the numbers in inode.h;
        !           116:  * they are repeated here so the protocol
        !           117:  * is all defined in one place
        !           118:  */
        !           119: #define NI_SEARCH 0    /* search only (0 value known to nilargnamei, beware) */
        !           120: #define NI_DEL 1       /* unlink this file */
        !           121: #define NI_CREAT 2     /* create it if it doesn't exits */
        !           122: #define NI_NXCREAT 3   /* create it, error if it already exists */
        !           123: #define NI_LINK        4       /* make a link */
        !           124: #define NI_MKDIR 5     /* make a directory */
        !           125: #define NI_RMDIR 6     /* remove a directory */
        !           126: 
        !           127: /*
        !           128:  * stat
        !           129:  */
        !           130: #define        SST_TIME        (SNBSIZE+0)     /* (long) time, for synchronization */
        !           131: /* four bytes of padding */
        !           132: #define        SSTSIZE         (SNBSIZE+8)
        !           133: 
        !           134: /*
        !           135:  * ioctl
        !           136:  */
        !           137: #define        SIO_CMD         (SNBSIZE+0)     /* (long) function code */
        !           138: #define        SIO_FLAG        (SNBSIZE+4)     /* (short) file flags; silly? */
        !           139: /* two bytes padding */
        !           140: #define        SIOSIZE         (SNBSIZE+8)
        !           141: #define        SIODATA         64              /* bytes of data follow */
        !           142: /* does some ioctl data follow? */
        !           143: 
        !           144: /*
        !           145:  * responses from server to client
        !           146:  */
        !           147: 
        !           148: /*
        !           149:  * general header
        !           150:  */
        !           151: #define        RNB_TRANNUM     0       /* (long) transaction ID */
        !           152: #define        RNB_ERRNO       4       /* (short) error number; zero if OK */
        !           153: #define        RNB_FLAGS       6       /* (char) see below */
        !           154: /* one byte of pad */
        !           155: #define        RNB_LEN         8       /* (long) including header and any data */
        !           156: #define        RNB_FSIZE       12      /* (long) file size after write (why here?) */
        !           157: #define        RNBSIZE         16
        !           158: 
        !           159: /*
        !           160:  * flags
        !           161:  */
        !           162: #define        NBROOT  1       /* namei popped out of root */
        !           163: #define        NBEND   2       /* last read was short, probably end of file */
        !           164: 
        !           165: /*
        !           166:  * extra data for each type of response
        !           167:  */
        !           168: 
        !           169: /*
        !           170:  * read: no extra header info;
        !           171:  * data follows at offset RNBSIZE
        !           172:  */
        !           173: 
        !           174: /*
        !           175:  * namei
        !           176:  * contains an entire stat response
        !           177:  * so sys stat sends one namei message and no stat message
        !           178:  * not exactly a stat message, though: RNM_USED is in the middle
        !           179:  */
        !           180: 
        !           181: #define        RNM_TAG         (RNBSIZE+0)     /* (long) new file */
        !           182: #define        RNM_INO         (RNBSIZE+4)     /* (long) its i-number */
        !           183: #define        RNM_DEV         (RNBSIZE+8)     /* (short) st_dev */
        !           184: #define        RNM_MODE        (RNBSIZE+10)    /* (short) mode */
        !           185: #define        RNM_USED        (RNBSIZE+12)    /* (long) filename chars consumed (NBROOT only) */
        !           186: #define        RNM_NLINK       (RNBSIZE+16)    /* (short) */
        !           187: #define        RNM_UID         (RNBSIZE+18)    /* (short) */
        !           188: #define        RNM_GID         (RNBSIZE+20)    /* (short) */
        !           189: #define        RNM_RDEV        (RNBSIZE+22)    /* (short) st_rdev; useful? */
        !           190: #define        RNM_SIZE        (RNBSIZE+24)    /* (long) */
        !           191: #define        RNM_ATIME       (RNBSIZE+28)    /* (long) */
        !           192: #define        RNM_MTIME       (RNBSIZE+32)    /* (long) */
        !           193: #define        RNM_CTIME       (RNBSIZE+36)    /* (long) */
        !           194: #define        RNMSIZE         (RNBSIZE+40)
        !           195: 
        !           196: /*
        !           197:  * stat
        !           198:  */
        !           199: #define        RST_INO         (RNBSIZE+0)     /* (long) i-number */
        !           200: #define        RST_DEV         (RNBSIZE+4)     /* (short) st_dev */
        !           201: #define        RST_MODE        (RNBSIZE+6)     /* (short) */
        !           202: #define        RST_NLINK       (RNBSIZE+8)     /* (short) */
        !           203: #define        RST_UID         (RNBSIZE+10)    /* (short) */
        !           204: #define        RST_GID         (RNBSIZE+12)    /* (short) */
        !           205: #define        RST_RDEV        (RNBSIZE+14)    /* (short) st_rdev; used? */
        !           206: #define        RST_SIZE        (RNBSIZE+16)    /* (long) */
        !           207: #define        RST_ATIME       (RNBSIZE+20)    /* (long) */
        !           208: #define        RST_MTIME       (RNBSIZE+24)    /* (long) */
        !           209: #define        RST_CTIME       (RNBSIZE+28)    /* (long) */
        !           210: #define        RSTSIZE         (RNBSIZE+32)
        !           211: 
        !           212: /*
        !           213:  * ioctl:
        !           214:  * no header, just SIOSIZE bytes of ioctl data
        !           215:  */
        !           216: 
        !           217: /*
        !           218:  * dirread
        !           219:  */
        !           220: #define        RDI_USED        (RNBSIZE+0)     /* (long) advance file pointer this much */
        !           221: /* four bytes of junk */
        !           222: #define        RDISIZE         (RNBSIZE+8)

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