[问题]mount的loop什么意思？

麦克马拉曼

mount的loop参数是什么意思呢？

archangle

THE LOOP DEVICE
       One  further possible type is a mount via the loop device. For example,
       the command

         mount /tmp/fdimage /mnt -t msdos -o loop=/dev/loop3,blocksize=1024

       will set up the loop  device  /dev/loop3  to  correspond  to  the  file
       /tmp/fdimage,  and  then mount this device on /mnt.  This type of mount
       knows about three options, namely loop, offset and encryption, that are
       really  options to losetup(.  If no explicit loop device is mentioned
       (but just an option `-o loop' is given), then mount will  try  to  find
       some  unused  loop device and use that.  If you are not so unwise as to
       make /etc/mtab a symbolic link to /proc/mounts  then  any  loop  device
       allocated  by  mount will be freed by umount.  You can also free a loop
       device by hand, using `losetup -d', see losetup(.

linuxkumao

英文不行啊！麻烦高手用中文说说噻！