The size and offset arguments may be followed by binary (2^N) suffixes KiB, MiB, GiB, TiB, PiB, and EiB (the "iB" is optional, e.g., "K" has the same meaning as "KiB") or decimal (10^N) suffixes KB, MB, GB, PB, and EB.
-a, --all
show status of all loop devices
-c, --set-capacity loopdev
force loop driver to reread size of the file associated with the specified loop device
-d, --detach loopdev...
detach the file or device associated with the specified loop device(s)
-e, -E, --encryption encryption_type
enable data encryption with specified name or number
-f, --find
find the first unused loop device. If a file argument is present, use this device. Otherwise, print its name.
-h, --help
print help
-j, --associated file
show status of all loop devices associated with given file
-k, --keybits num
set the number of bits to use in key to num.
-N, --nohashpass
Do not hash the password. By default, Debian systems run the password through a hash function, non-Debian systems may not.
-o, --offset offset
the data start is moved offset bytes into the specified file or device
--sizelimit size
the data end is set to no more than size bytes after the data start
-r, --read-only
setup read-only loop device
--show
print device name if the -f option and a file argument are present. The short form of this option (-s) is deprecated. This short form could be in collision with Loop-AES implementation where the same option is used for --sizelimit.
It is possible to specify transfer functions (for encryption/decryption or other purposes) using one of the -E and -e options. There are two mechanisms to specify the desired encryption: by number and by name. If an encryption is specified by number then one has to make sure that the Linux kernel knows about the encryption with that number, probably by patching the kernel. Standard numbers that are always present are 0 (no encryption) and 1 (XOR encryption). When the cryptoloop module is loaded (or compiled in), it uses number 18. This cryptoloop module takes the name of an arbitrary encryption type and find the module that knows how to perform that encryption.
losetup returns an exit status of 0 on success, nonzero on failure. When losetup displays the status of a loop device, it returns 1 if the device is not configured and 2 if an error occurred which prevented losetup from determining the status of the device.
DES encryption is painfully slow. On the other hand, the simple XORmethod is terribly weak. Both are considered insecure compared to newer algorithms. Additionally, some ciphers may require a license for you to be allowed to use them.
Cryptoloop is deprecated in favor of dm-crypt. For more details see cryptsetup.
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losetup 例子
如果使用的是可加載回路設備模塊，則必須首先使用以下命令加載模塊：
modprobe loop
可能還需要加密模塊。
modprobe des
modprobe cryptoloop
以下命令是使用循環設備的示例：
dd if=/dev/zero of=/file bs=1k count=100
losetup -e des /dev/loop0 /file
Password:
Init (up to 16 hex digits):
mkfs -t ext2 /dev/loop0 100
mount -t ext2 /dev/loop0 /mnt
...
umount /dev/loop0
losetup -d /dev/loop0
如果使用的是可加載模塊，則可以使用以下命令刪除該模塊：
rmmod loop
If you are using the loadable loop device module, you must have the module loaded first with the command:
modprobe loop
Encryption modules may also be needed.
modprobe des
modprobe cryptoloop
The following commands are an example of using the loop device:
dd if=/dev/zero of=/file bs=1k count=100
losetup -e des /dev/loop0 /file
Password:
Init (up to 16 hex digits):
mkfs -t ext2 /dev/loop0 100
mount -t ext2 /dev/loop0 /mnt
...
umount /dev/loop0
losetup -d /dev/loop0
If you are using the loadable module, you may remove the module with the command:
losetup (設置并控制循環設備)
在Linux操作系統上，Lostup命令設置并控制循環設備。
On Linux operating systems, the losetup command sets up and controls loop devices.
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1 losetup 運行系統環境
2 losetup 語法
3 losetup 選件
4 losetup 加密
5 losetup 退出狀態
6 losetup 局限性
7 losetup 例子
losetup 運行系統環境
Linux
losetup 語法
losetup [{-e|-E} encryption] [-o offset] [--sizelimit size] [-p pfd] [-r] {-f[--show]|loopdev} filelosttup用于將循環設備與常規文件或塊設備關聯，分離循環設備并查詢循環設備的狀態。
循環設備，也稱為vnd（vnode磁盤）或lofi（環回文件接口）是使文件可作為塊設備訪問的偽設備。
如果僅給出loopdev參數，則顯示相應循環設備的狀態。
losetup [{-e|-E} encryption] [-o offset] [--sizelimit size] [-p pfd] [-r] {-f[--show]|loopdev} filelosetup is used to associate loop devices with regular files or block devices, to detach loop devices and to query the status of a loop device.
A loop device, also known as vnd (vnode disk) or lofi (loopback file interface) is a pseudo-device that makes a file accessible as a block device.
If only the loopdev argument is given, the status of the corresponding loop device is shown.
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losetup 選件
大小和偏移量參數后可以跟二進制（2 ^ N）后綴KiB，MiB，GiB，TiB，PiB和EiB（“ iB”是可選的，例如，“ K”的含義與“ KiB”相同）或十進制（10 ^ N）后綴KB，MB，GB，PB和EB。
-a, --all
顯示所有回路設備的狀態
-c, --set-capacity loopdev
強制循環驅動程序重新讀取與指定循環設備關聯的文件的大小
-d, --detach loopdev...
分離與指定循環設備關聯的文件或設備
-e, -E, --encryption encryption_type
啟用具有指定名稱或編號的數據加密
-f, --find
查找第一個未使用的環路設備。如果存在文件參數，請使用此設備。否則，請打印其名稱。
-h, --help
打印幫助
-j, --associated file
顯示與給定文件關聯的所有循環設備的狀態
-k, --keybits num
將密鑰中使用的位數設置為num。
-N, --nohashpass
不要哈希密碼。默認情況下，Debian系統通過哈希函數運行密碼，而非Debian系統可能不會。
-o, --offset offset
數據開始將偏移字節移到指定的文件或設備中
--sizelimit size
數據開始后，數據結束設置為不超過大小字節
-r, --read-only
設置只讀循環設備
--show
如果存在-f選項和文件參數，則打印設備名稱。不建議使用此選項的縮寫形式（-s）。這種簡短形式可能與Loop- AES實現沖突，后者對--sizelimit使用相同的選項。
The size and offset arguments may be followed by binary (2^N) suffixes KiB, MiB, GiB, TiB, PiB, and EiB (the "iB" is optional, e.g., "K" has the same meaning as "KiB") or decimal (10^N) suffixes KB, MB, GB, PB, and EB.
-a, --all
show status of all loop devices
-c, --set-capacity loopdev
force loop driver to reread size of the file associated with the specified loop device
-d, --detach loopdev...
detach the file or device associated with the specified loop device(s)
-e, -E, --encryption encryption_type
enable data encryption with specified name or number
-f, --find
find the first unused loop device. If a file argument is present, use this device. Otherwise, print its name.
-h, --help
print help
-j, --associated file
show status of all loop devices associated with given file
-k, --keybits num
set the number of bits to use in key to num.
-N, --nohashpass
Do not hash the password. By default, Debian systems run the password through a hash function, non-Debian systems may not.
-o, --offset offset
the data start is moved offset bytes into the specified file or device
--sizelimit size
the data end is set to no more than size bytes after the data start
-r, --read-only
setup read-only loop device
--show
print device name if the -f option and a file argument are present. The short form of this option (-s) is deprecated. This short form could be in collision with Loop-AES implementation where the same option is used for --sizelimit.
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losetup 加密
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losetup 退出狀態
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losetup 局限性
DES加密非常緩慢。另一方面，簡單的XOR方法非常薄弱。與更新算法相比，兩者都被認為是不安全的。此外，某些密碼可能需要許可才能使用。
不贊成使用Cryptoloop，而建議使用dm-crypt。有關更多詳細信息，請參見cryptsetup。
DES encryption is painfully slow. On the other hand, the simple XORmethod is terribly weak. Both are considered insecure compared to newer algorithms. Additionally, some ciphers may require a license for you to be allowed to use them.
Cryptoloop is deprecated in favor of dm-crypt. For more details see cryptsetup.
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losetup 例子
如果使用的是可加載回路設備模塊，則必須首先使用以下命令加載模塊：
可能還需要加密模塊。
以下命令是使用循環設備的示例：
如果使用的是可加載模塊，則可以使用以下命令刪除該模塊：
If you are using the loadable loop device module, you must have the module loaded first with the command:
Encryption modules may also be needed.
The following commands are an example of using the loop device:
If you are using the loadable module, you may remove the module with the command:
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其他命令行
link | ldd | last | ln | login | ls | lsmod | lpstat | lprm | lpr | lpq | lp | lpc | locate | logname | lpadmin |