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    Command:

    losetup

    
    
    

    SYNOPSIS

           Get info:
    
                losetup loopdev
    
                losetup -a
    
                losetup -j file [-o offset]
    
           Delete loop:
    
                losetup -d loopdev...
    
           Print name of first unused loop device:
    
                losetup -f
    
           Setup loop device:
    
                losetup [{-e|-E} encryption] [-o offset] [--sizelimit limit]
                        [-p pfd] [-r] {-f[--show]|loopdev} file
    
           Resize loop device:
    
                losetup -c loopdev
    
    
    

    DESCRIPTION

           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. If only the loopdev argument is given, the status of the corre-
           sponding loop device is shown.
    
       Encryption
           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
           will take the name of an arbitrary encryption type and find the  module
           that knows how to perform that encryption.
    
    
    

    OPTIONS

           -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
    
           -j, --associated file
                  show status of all loop devices associated with given file
    
           -o, --offset offset
                  the data start is moved offset bytes into the specified file  or
                  device
    
           --sizelimit limit
                  the  data  end  is set to no more than sizelimit bytes after the
                  data start
    
           -p, --pass-fd num
                  read the passphrase from file descriptor with number num instead
                  of from the terminal
    
           -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.
    
           -v, --verbose
                  verbose mode
    
    
    

    RETURN VALUE

           losetup returns 0 on success, nonzero on failure. When losetup displays
           the  status of a loop device, it returns 1 if the device is not config-
           ured and 2 if an error occurred which prevented losetup from  determin-
           ing the status of the device.
    
    
    

    FILES

           /dev/loop0, /dev/loop1, ...   loop devices (major=7)
    
    
    

    EXAMPLE

           If  you  are  using the loadable module you must have the module loaded
           first with the command
    
                  # modprobe loop
    
           Maybe also encryption modules are needed.
    
                  # modprobe des # modprobe cryptoloop
    
           The following commands can be used as an  example  of  using  the  loop
           device.
                  # rmmod loop
    
    
    

    RESTRICTION

           DES encryption is painfully slow. On the other hand,  XOR  is  terribly
           weak.
    
           Cryptoloop  is  deprecated  in  favor of dm-crypt. For more details see
           cryptsetup(8).
    
    
    

    AVAILABILITY

           The losetup command is part of the util-linux-ng package and is  avail-
           able from ftp://ftp.kernel.org/pub/linux/utils/util-linux-ng/.
    
    
    

    Linux 2003-07-01 LOSETUP(8)

    
    
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