A loop device allows any file to be mounted as a filesystem image. Not to be confused with a loopback interface in networking.
3
votes
4answers
55 views
How can I partition a volume in a regular file without loop?
I'm trying to play around with OS development, and I started with a boot loader, where phase 0 loads phase 1 from a file (specified by inode) on an ext4 partition (specified by first LBA). Of course, ...
2
votes
2answers
99 views
busybox initramfs loop mount
I'm trying to loop mount my root filesystem (a loop file) within a busybox initramfs.
I try to run the command:
mount /rootfs.raw /root
... which works on my Ubuntu laptop, however, I simply get
...
2
votes
2answers
119 views
Loop Mounting in Parallel
I am doing a project in which I need to mount 100+ loop devices and merge it into AUFS mountpoint
As an observation, for sequentially mounting 90 loop devices, it takes 25 seconds.
I am looking for ...
1
vote
0answers
26 views
Max file size for create_compressed_fs tool
Somebody knows what the maximum size of file could be processed by create_compressed_fs tool or used by /dev/cloop device? I suspect that it could be the root of the issue.
I created "ISO" (UDF) ...
1
vote
0answers
68 views
Will there be any security problem to permit non-root user set up a loopback devices?
if the user has full access to the image file (iso or disk image), will there be any security problem to permit him set up a loopback device backed by this file ?
% ls -al /dev/loop* ...
1
vote
1answer
842 views
mount: could not find any free loop device
When I try to mount an ISO image with mount -o loop I get
mount: could not find any free loop device
Running losetup -a shows
/dev/loop0: [0005]:2464 (/dev/sda1)
/dev/loop1: [0005]:3439 ...
-1
votes
4answers
168 views
Ending Process Infinite Loop Input Redirection
Edit: I realized that the program I was trying to run had an infinite loop after scanning all my input. Then just prints out infinitely so it'll never read the EOF. It'll read the last input then go ...
0
votes
3answers
200 views
Why does this work: “cp image.bin /dev/mapper/loop0p1”?
Why does this work?
cp image.bin /dev/mapper/loop0p1
image.bin is a partition image.
I have tried it and works, but why? Shouldn't a dd be used?
3
votes
2answers
198 views
How to add a ms-dos partition table to a loop device?
I recently made a dd from a disk partition. I want to use it as a disk in a virtual machine. I can't because the disk has no partition table.
Can I had a partition table to a loop device? how?
...
2
votes
1answer
219 views
GNU/Linux: overlay block device / stackable block device
GNU/Linux has union mount that overlays dirs. So you can mount a writeable dir on top of a read-only dir. When the writeable dir is unmounted the read-only dir is untouched.
I am looking for the same ...
6
votes
2answers
3k views
When mounting, when should I use a loop device?
According to the following question:
What is a "loop device" when mounting?
A loop device is a file that acts as a block-based device. While I can understand that conceptually, how is this ...
2
votes
3answers
1k views
How to iterate through a comma-separated list and execute a command for each entry
I have been give a command which outputs a comma-separated list for autosys jobs in the variable $all_jobs:
box=box-of-jobs;all_jobs=$(jobscout -box $box | egrep "^\w+" | tr '\n' ',' | sed s/.$//);
...
2
votes
2answers
212 views
Second loopback network interface (for netem)
I would like to add a second loopback network device on Linux, so that I have lo and (e.g.) lo2. This is so that I can use netem to simulate a throttled network over lo2 without compromising my ...
2
votes
3answers
287 views
Ensure that loopback root and host are unmounted on shutdown
I'm trying to setup a Linux system that runs from an LVM-formatted image file. After some tinkering with the initramfs and boot options I managed to make it up and running by mounting the host file ...
3
votes
1answer
253 views
Virtual file made out of smaller ones (for mac-like sparse bundle solution)
I'd like to recreate a feature of Mac OS X called sparse bundles (disk images made out of smaller files, making them easy to backup after a small change). For that I'm looking for a way to ...
3
votes
1answer
403 views
How do I setup more then 10 loopback device?
From this answer the solution is to
modprobe loop max_loop=64
Which makes me allowed to use 64 loopback devices then
mknod -m 660 /dev/loop8 b 7 8
To create the devices. I did this for 8, 9, 10 ...
2
votes
1answer
44 views
Grub change loopback amount?
I'm having an issue with loopback. It looks like there is only 8. I did a search and apparently the problem is grub by default only has 8 loopback (devices?). If i look in /dev/ i see loop 0-7 so that ...
3
votes
1answer
45 views
How to make sure a loopfile is only mounted once?
When mounting a filesystem image via mount -o loop, is there any mechanism to prevent the same file to be mounted a second time?
4
votes
2answers
384 views
loop-device: is this a Linux entity or a lower-level one?
Here's an Ubuntu How-to about booting from ISO-image on flash.
http://ubuntuforums.org/showthread.php?t=1288604
What I don't get is creation of loop-device in GRUB2 prior to booting a kernel:
...
2
votes
2answers
2k views
How is the loopback network interface implemented?
The loopback network interface "is a virtual network device implemented entirely in software," according to another question on Unix.SE.
But how is this implementation actually accomplished, and how ...
2
votes
2answers
755 views
creating a device image for a network location
I have a dedicated ubuntu server with hetzner.de. hetzner also provides a seperate backup space accessible via samba/ftp/sftp/scp.
In their support document about backups, the following line is ...
5
votes
4answers
2k views
How can I mount partitons in a full disk image (i.e. image with partition table) with fuse?
It's a bit indirect, but it's possible mount a partition with a disk image using mount or losetup's "offset" parameter.
I'm looking to be able to use fuse to do the same thing in user space
Use ...
2
votes
1answer
965 views
slitaz 4.0 grub2 loopback concatenate multiple initrd images
I'm trying to get slitaz 4.0 ISO to boot using a grub2 loopback on a multiboot USB;
insmod font
if loadfont /boot/grub/unicode.pf2 ; then
insmod gfxterm
# insmod efi_gop
# insmod efi_uga
...
1
vote
0answers
420 views
Debian VPS, no loop devices present, modprobe fails
After acquiring a new virtual Debian squeeze I ran into a problem regarding loop devices.
My plan was to set up an encrypted FS in a regular file and mount it. Unfortunately I can't do that since ...
7
votes
3answers
1k views
Mounting multiple img files as single loop device
Is there a way to take an disk img file that is broken up into parts and mount it as a single loop device?
3
votes
2answers
499 views
How to remove length limit from losetup -a
I am using losetup -a to see my loop devices, but it has a length limit (which is 62 characters). So I can't know for sure which loop device I really want.
Ex:
[root@r7byach]# losetup -a
...
15
votes
2answers
1k views
What is a “loop device” when mounting?
I am doing a mounting of an iso file and looking at this tutorial. They use the command:
$ mount -o loop disk1.iso /mnt/disk
I'm trying to understand the use of -o loop. So I have two questions:
...
3
votes
2answers
2k views
Finding the offset for ext4 partition
I've created an image of my hd with dd, but grub was installed on it, and I'm trying to figure out how to mount the image file, but mount doesn't recognise it as an ext4 partition because of the grub ...
