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Linux 和 Windows 共享交換區(qū)

Linux 和 Windows 共享交換區(qū)

作者:佚名來源:單片機錄入:jdzj868 更新時間：2009-8-12 16:56:03 點擊數(shù)：0

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】

      1. 前言
      現(xiàn)在,越來越多的人在一臺使用Linux 和 Windows. 這應該說是Linux的勝利. 我們知
      道, Linux 要使用交換分區(qū)，
      Windows 要使用交換文件。如果一臺PIII, 有192M 內(nèi)存，我們分配給Linux 192M 交換
      區(qū)， Windows 2000 至少要
      200M. 那么，我們要用近400M硬盤空間。如果交換區(qū)更大，浪費就更可觀了。
      由于兩個系統(tǒng)的交換區(qū)都只是運行時的臨時數(shù)據(jù),所以,我們采用動態(tài)修改分區(qū)信息的方法
      來達到共享目的.

      2. 方法簡介
      1). 備份Windows 分區(qū)信息。
      2). 當啟動Linux時，將該分區(qū)做成Linux 交換區(qū)，并將其激活。
      3）當Linux 關閉時，將該分區(qū)重新變成Windows 交換區(qū)。

      3. 具體步驟
      1). 分區(qū)
      Fdisk, 只分主分區(qū), 不分擴展分區(qū)
      2). 安裝 Windows.
      3). 安裝Linux (占一個主分區(qū))
      4). 在Linux 下, 分擴展分區(qū))
      5). 設定Linux交換區(qū)(假定/dev/hda10)
      6). 建立winswap 設備
      ln -s /dev/hda10 /dev/winswap
      7). 啟動Linux, 關閉交換區(qū)
      # swapoff -a
      8). 從文件安裝表中刪除該分區(qū)
      vi /etc/fstab
      注釋掉該行 (/dev/hda10)
      9). 將該分區(qū)該成 FAT16 或其他 DOS 分區(qū).
      10). 啟動 Windows
      a). 格式化該分區(qū)
      b). 將系統(tǒng)的交換文件設在該分區(qū).
      11). 啟動 Linux, 計算Total Special Sectors
      公式:
      T = r + (s * f) + (d / 16)
      參數(shù):
      Reserved Sectors at beginning : r
      FAT Copies : f
      Sectors per FAT : s
      Root directory entries : d
      參見: msinfo.sh
      注解: 可以運行 msinfo.sh 來獲得.
      # msinfo.sh /dev/hda10

      12). 備份Windows 分區(qū)信息
      # dd if=/dev/winswap bs=512 count=XXX | gzip -9 > /etc/winswap.gz
      這里, XXX = T
      14). 編寫啟動, 退出腳本, 并把它們放在 /etc/rc.d/xxx.
      可用 grep -nr * | grep swapon (或 swapoff) 來找系統(tǒng)激活和關閉交換區(qū), 將它們
      替換稱我們
      的腳本)
      我們在附錄中提供了啟動和關閉的腳本.
      4. 附加說明
      1. 本文使用的是FAT16, 如果使用NTFS 或其它, 必須修改腳本.
      2. mkswap /dev/winswap 377496 (這個值需要修改, 依照你的分區(qū)大小)

      5. 參考資料:
      Linux HOWT Swap-space

      6. 附錄 -- 相應的腳本
      1. msinfo.sh 腳本
      #!/bin/sh
      #
      # msinfo.sh This shell script displays the boot sector of the
      # given partition.
      #
      # Author: Rahul U. Joshi
      #
      # Modifications Removed the use of expr and replaced it by the let
      # command.

      # check for command line arguments
      if [ $# -ne 1 ]; then
      echo "Usage: msinfo "
      exit 1
      fi

      # check whether the input name is a block device
      if [ ! -b $1 ]; then
      echo "msinf $1 is not a block device"
      exit 1
      fi

      # create two temporary files for use
      TMPFILE=`mktemp -q /tmp/$0.XXXXXX`
      if [ $? -ne 0 ]; then
      echo "msinf Can't create temp file, exiting..."
      exit 1
      fi

      TXTFILE=`mktemp -q /tmp/$0.XXXXXX`
      if [ $? -ne 0 ]; then
      echo "msinf Can't create temp file, exiting..."
      rm -f $TMPFILE
      exit 1
      fi

      back_title="`printf "%78s" "msinfo, Information about FAT16 filesystem --
      Rahul
      Joshi"`"

      dialog --title "Boot sector of $1" --backtitle "$back_title" --infobox
      "\nAnalysing boot sector for $1\nPlease wait ..." 14 60

      # truncate TXTFILE to zero length
      echo > $TXTFILE

      # get Formatting DOS version
      dd 2>/dev/null if=$1 bs=1 count=8 skip=3 | dd 2>/dev/null of=$TMPFILE
      printf >>$TXTFILE "%30s : %s\n" "Formatting DOS version" "`cat $TMPFILE`"

      # get file system
      dd 2>/dev/null if=$1 bs=1 count=8 skip=54 | dd 2>/dev/null of=$TMPFILE
      printf >>$TXTFILE "%30s : %s\n" "Filesystem" "`cat $TMPFILE`"

      # check if filesystem in a FAT16
      if [ "`cat $TMPFILE`" != "FAT16 " ]; then
      dialog --title "Boot sector of $1" --backtitle "$back_title" --infobox
      "\nCan't find a FAT16 filesystem on $1" 14 60
      exit 2
      fi

      # get volume label in boot sector
      dd 2>/dev/null if=$1 bs=1 count=11 skip=43 | dd 2>/dev/null of=$TMPFILE
      printf >>$TXTFILE "%30s : %s\n" "Volume label in boot sector" "`cat
      $TMPFILE`"

      # get Sector size
      dd 2>/dev/null if=$1 bs=1 count=2 skip=11| od -An -tdS | dd 2>/dev/null
      of=$TMPFILE
      printf >>$TXTFILE "%30s : %d\n" "Sector size" `cat $TMPFILE`
      sector_size=`cat $TMPFILE`

      # get Reserved sectors
      dd 2>/dev/null if=$1 bs=1 count=2 skip=14| od -An -tdS | dd 2>/dev/null
      of=$TMPFILE
      printf >>$TXTFILE "%30s : %d\n" " Reserved sectors" `cat $TMPFILE`
      reserved_sectors=`cat $TMPFILE`

      # get FAT sectors
      dd 2>/dev/null if=$1 bs=1 count=1 skip=16| od -An -tdS | dd 2>/dev/null
      of=$TMPFILE
      fat_count=`cat $TMPFILE`

      dd 2>/dev/null if=$1 bs=1 count=2 skip=22| od -An -tdS | dd 2>/dev/null
      of=$TMPFILE
      sectors_per_fat=`cat $TMPFILE`

      # calculate the no of sectors allocated for FAT's
      let fat_sectors=fat_count*sectors_per_fat

      printf >>$TXTFILE "%30s : %u (%u x %u) \n" "FAT sectors" "$fat_sectors"
      "$fat_count" "$sectors_per_fat"

      # get root directory sectors
      dd 2>/dev/null if=$1 bs=1 count=2 skip=17| od -An -tdS | dd 2>/dev/null
      of=$TMPFILE
      root_sectors=`cat $TMPFILE`

      # calculate the no of sectors allocated for root directory
      let root_sectors=root_sectors*32/sector_size

      printf >>$TXTFILE "%30s : %u\n" "Root directory sectors" "$root_sectors"

      # get Total special sectors
      let total=reserved_sectors+fat_sectors+root_sectors
      printf >>$TXTFILE "%30s : %u\n" "Total special sectors" "$total"

      # display the information in a message box
      dialog --title "Boot sector of $1" --backtitle "$back_title" --msgbox
      "`cat $TXTFILE`" 14 60

      # delete temporary files
      rm -f $TMPFILE
      rm -f $TXTFILE

      # end of msinfo.sh

      2. swapinit.sh
      #!/bin/sh
      #
      # /etc/rc.d/init.d/swapinit.sh - activate the swap partition
      #
      # written by Rahul U. Joshi
      # Verify and initialize swap space
      #

      echo -n 'Verifying swap space... '

      loopcount=0

      # flag to indicate whether the partition has been activated or not
      activated=0

      # check for signatures 6 times before giving up
      while [ $loopcount -lt 6 ]
      do
      if [ "`/bin/dd 2>/dev/null if=/dev/winswap bs=1 count=10 skip=4086`" =
      'SWAPSPACE2' ]; then

      echo "Linux signature found, iteration $loopcount"
      echo "Activating swap partitions"
      swapon /dev/winswap
      activated=1
      break

      elif [ "`/bin/dd 2>/dev/null if=/dev/winswap bs=1 count=5 skip=54`" =
      'FAT16' ]; then
      echo "DOS signature found, iteration $loopcount"
      echo "Making swap partition"
      mkswap /dev/winswap 377496
      echo "Activating swap partitions"
      swapon /dev/winswap
      activated=1
      break

      else
      let loopcount=loopcount+1
      fi

      done

      if [ $activated -ne 1 ] ; then
      echo "Swap signature not found after $loopcount tries"
      echo "No swapping partitions activated"
      exit 1
      fi

      3. swaphalt.sh
      #!/bin/sh
      #
      # /etc/rc.d/init.d/swapinit.sh - activate the swap partition
      #
      # written by Rahul U. Joshi
      # Verify and initialize swap space
      #

      echo -n 'Verifying swap space... '

      loopcount=0

      # flag to indicate whether the partition has been activated or not
      activated=0

      # check for signatures 6 times before giving up
      while [ $loopcount -lt 6 ]
      do
      if [ "`/bin/dd 2>/dev/null if=/dev/winswap bs=1 count=10 skip=4086`" =
      'SWAPSPACE2' ]; then

      echo "Linux signature found, iteration $loopcount"
      echo "Activating swap partitions"
      swapon /dev/winswap
      activated=1
      break

      elif [ "`/bin/dd 2>/dev/null if=/dev/winswap bs=1 count=5 skip=54`" =
      'FAT16' ]; then
      echo "DOS signature found, iteration $loopcount"
      echo "Making swap partition"
      mkswap /dev/winswap 377496
      echo "Activating swap partitions"
      swapon /dev/winswap
      activated=1
      break

      else
      let loopcount=loopcount+1
      fi

      done

      if [ $activated -ne 1 ] ; then
      echo "Swap signature not found after $loopcount tries"
      echo "No swapping partitions activated"
      exit 1
      fi

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