Contents
How to create a loopback file system image?
The answer is creating loopback devices which are basically file-systems in a single file (which is what you create when you DD a working image from an SD card, for example). 1. Decide what size you would like your image to be. For this example and the OpenELEC image I posted previously, I used 1GB.
Can a loopback device be used by root?
The linux loopback device can be used by root only, and needs to be enabled in the kernel before use. First, lets create an empty image. Now, lets set it up for mounting.
How to dismount a file from a loop?
To dismount the file, you need to refer to the loop device, not the file. Hence you need in /etc/fstab an entry that matches both the loop device used in /etc/mtab, here /dev/loop0, and the mount point, here /mnt/iso.
How to create a loopback device in FreeBSD?
Loopback Device under FreeBSD. FreeBSD uses mdconfig. First, use DD to create an empty floppy image (1.44 MB in size). Memdisks are allocated dynamically, and the name is displayed after the mdconfig command. This assumes that “md0” is printed.
Is there a kind of loopback device that can grow in size?
However in this case the disk image is fixed at 2GB. It’s 2GB when it’s empty, and it’s 2GB when it’s full. It will not grow. Is there a kind of loopback device that can grow in size?
How to detach the loopback device in Linux?
Ok, unmount the partition and detach the loopback device. Linux command to unmount a filesystem. One final thing to do, which is to simplify mounting and unmounting that partition. This is essentially a combination of the losetup and mount commands we used previously when formatting the partition.
Why do I need to Mount partition on loopback device?
Note: The reason for #blocks is the same as for ext2fs, ie possible multiple partitions. You should now be able to mount the partition (Because it is still setup on the loopback device). Filesystem being used, Linux can usually figure this out on its own. A directory to mount the partition on. This should leave you with a nicely mounted partition.