请教mount loop

[isrunnIng]

mount -o loop boot.rom /mnt/xxx

什么意思？其中的loop到底有什么用的？

[isrunnIng]

谢谢了
mount -o loop boot.rom /mnt/xxx
这loop后面没带参数，有什么区别？
还有这个命令之后需不需要umount？

[tukey]

up

[Wolf0403]

mount(1):

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 los-
etup(8). 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(8).

简而言之就是用一个文件系统中的普通文件虚拟成一个设备文件用于挂载的方法。

[tkit]

可以拆分成两个步骤：
losetup /dev/loop1 boot.rom
mount /dev/loop1 /mnt/xxx

boot.rom 是一个普通文件，但是其内容包含文件内容

[isrunnIng]

没有人回答吗?

[蓝色玺印]

挂载iso镜像文件