On Fri, 1 Feb 2019 at 05:50, Pascal Hambourg <pas...@plouf.fr.eu.org> wrote: > > Le 31/01/2019 à 02:15, David a écrit : > > > > A *loop* device is a *filesystem* technique to make a file > > accessible as a block device. > > I do not think that loop devices have anything to do with filesystems. > The losetup(8) manpage states : > > losetup is used to associate loop devices with regular files or > *block devices* (...) > > A use case for a loop device based on another block device is to create > a partitionable block device when the underlying block device contains a > raw disk image but is not partitionable (e.g. partition or logical volume). > > > ----- begin quote ----- > > The loop devices are used to mount filesystems not > > associated with block devices. > > ----- end quote ----- > > There are other uses. In addition to the use case I mentionned above, a > loop device can also be used as a swap device when the filesystem does > not support swap files (e.g. btrfs).
Thanks for clarifying my imprecise language, and adding extra info.
