Mkfs - Build a Linux file system, usually a hard disk partition. If you are using the loadable module, you may remove the module with the command: rmmod loop Related commandsĭd - Copy and convert the encoding of files. Mkfs -t ext2 /dev/loop0 100 mount -t ext2 /dev/loop0 /mnt. 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: If you are using the loadable loop device module, you must have the module loaded first with the command: modprobe loopĮncryption modules may also be needed. Additionally, some ciphers may require a license for you to be allowed to use them.Ĭryptoloop is deprecated in favor of dm-crypt. Both are considered insecure compared to newer algorithms. On the other hand, the simple XOR method is terribly weak. LimitationsĭES encryption is painfully slow. When losetup displays the status of a loop device, it returns 1 if the device is not configured, and 2 if an error occurred that prevented losetup from determining the status of the device. Losetup returns an exit status of 0 on success, and nonzero on failure. This cryptoloop module takes the name of an arbitrary encryption type and finds the module that knows how to perform that encryption. When the cryptoloop module is loaded (or compiled in), it uses number 18. Standard numbers that are always present are 0 (no encryption) and 1 ( XOR encryption). If an encryption is specified by number, then one has to make sure the Linux kernel knows about the encryption with that number, probably by patching the kernel. There are two mechanisms to specify the desired encryption: by number and by name. It is possible to specify transfer functions (for encryption/decryption or other purposes) using one of the -E and -e options. This short form could be in collision with Loop- AES implementation, where the same option is used for -sizelimit. The short form of this option ( -s) is deprecated. Print device name if the -f option and a file argument are present. The data end is set to no more than size bytes after the data start The data start is moved offset bytes into the specified file or device By default, Debian systems run the password through a hash function, non-Debian systems may not. Set the number of bits to use in key to num.ĭo not hash the password. Show status of all loop devices associated with given file. If a file argument is present, use this device. a, -allįorce loop driver to reread size of the file associated with the specified loop device.ĭetach the file or device associated with the specified loop device(s).Įnable data encryption with specified name or number.įind the first unused loop device. 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. If only the loopdev argument is given, the status of the corresponding loop device is shown. Losetup 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.Ī 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. losetup -f losetup [ file losetup -c loopdev Syntax losetup loopdev losetup -a losetup -j file losetup -d loopdev.
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