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).