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    ÉèÒѽ¨Á¢ºÃµÄÎļþϵͳѹËõÎļþΪramdisk.gz
    1¡¢½âѹ
    #cd ramdisk.gzËùÔÚĿ¼
    #gunzip ramdisk.gz
    ÔÚ½âѹºó£¬µÃµ½Îļþϵͳ¾µÏóÎļþramdisk£¬ ¸²¸ÇÁËÔ­À´µÄѹËõÎļþ
    2¡¢¾µÏóÎļþ¹ÒÔØ
    ¾µÏóÎļþ±ØÐë¾­¹ý¹ÒÔØºó²ÅÄÜ¿´µ½ÎļþϵͳÖеĸ÷¸öĿ¼ºÍÏêϸÄÚÈÝ
    #mkdir /mnt/loop /* /mnt/loop ÊÇÎļþϵͳҪ¹ÒÔØµ½µÄĿ¼
    #mount ?Co loop ramdisk /mnt/loop
    ÔÚ¹ÒÔØÄ¿Â¼/mnt/loop϶ÔÎļþϵͳ½øÐвÙ×÷
    #cd /mnt/loop
    #do_whatever_you_want_to_do /*¸ù¾ÝÐèÒªÔö¼Ó¡¢É¾¼õ»òÊÇÐÞ¸ÄÎļþϵͳµÄÄÚÈÝ
    4¡¢Ð¶×°Îļþϵͳ
    Ìøµ½/mnt/loopĿ¼Í⣬·ñÔòÎÞ·¨Ð¶×°£¬Ìáʾbusy
    #cd ramdiskËùÔÚĿ¼
    #umount /mnt/loop
    5¡¢Ñ¹ËõÎļþϵͳ
    #gzip ?Cv9 ramdisk /*Éú³Éramdisk.gzѹËõÎļþ
    ¶þ¡¢×Ô¼º½¨Á¢¸ùÎļþϵͳ
    1¡¢½¨Á¢loopÉ豸µÄÁÙʱ¹ÒÔØµã
    #mkdir /mnt/loop
    2¡¢½¨Á¢Ò»¸ö´óСΪ15MµÄÁÙʱÎļþ
    #dd if=/dev/zero of=/tmp/loop_tmp bs=1k count=15360
    ×¢Òâ¿É¸ù¾Ý×Ô¼ºµÄÐèÒª½¨Á¢´óСºÏÊʵÄÎļþϵͳ£¬¸ü¸Äcount´óС¼´¿É¡£
   
´Ë´¦ÒÔddÃüÁÁ¢Ò»¸öÁËÒ»¸ö15360KBÎļþϵͳӳÏ󣬴æÓÚ/tmp/loop/tmp£¬²¢ÒÔ¡£dev/zero¶ÔËü½øÐгõʼ»¯¡£ÓÃÕâÖÖ·½Ê½¶ÔÎļþϵ
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    3¡¢½«É豸ÎļþÓëÁÙʱÎļþÁªÏµÆðÀ´
    #losetup /dev/loop0 /tmp/loop_tmp
    °ÑÉ豸Îļþ/dev/loop0ÓëÁÙʱ¾µÏóÎļþ/tmp/loop_tmpÁªÏµÆðÀ´£¬/dev/loop0ÊǸö¿éÉ豸
    Èç¹û³öÏÖ“ioctl£ºLOOP_SET_FD£ºÉ豸»ò×ÊԴ攣¬ËµÃ÷/dev/loop0É豸»¹ºÍÒ»ÎļþÁªÏµ£¬¿ÉÓÃlosetup
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