Bug 328237 – sys-kernel/gentoo-sources: No uevent when loop devices get removed (loopbacks persist in udisks when gone)

• Product: Gentoo Linux
• Status: RESOLVED FIXED

[Description ByrneG 2010-07-14 09:09:25 UTC]

After mounting a loopback filesystem (in this case a floppy image) and then later umounting it, Gnome still shows the device as present on the "Places" menu.

Running "losetup -a" doesn't show anything, indicating the device has been correctly unmounted.  However, "udisks --enumerate" does produce output, so the device hasn't been correctly unregistered.

I found that this bug has been logged for Ubuntu:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/554330

Reproducible: Always

Steps to Reproduce:
1. Mount loopback filesystem
2. Unmount loopback filesystem
3. udisks --enumerate

Actual Results:  
The loopback device persists in udisks even though it has been unmounted.

Expected Results:  
Remove the unmounted loobback device from the list of registered loopback devices.

[Comment 1 Samuli Suominen (RETIRED) 2010-07-14 09:40:05 UTC]

Patch here:

http://people.freedesktop.org/~david/0001-Generate-change-uevent-for-loop-device.patch

Applied to Linux GIT tree if I'm not mistaken here:

http://lkml.org/lkml/2010/5/21/327

So.. This is a bug in the kernel, not in udisks itself... reassigning to gentoo-sources maintainers

[Comment 2 Mike Pagano 2010-07-30 00:12:59 UTC]

Created attachment 240647 [details]
backported patch to generate "change" uevent for loop device

Can you apply this to gentoo-sources-2.6.34-r2 and let me know if it fixes your issue.

Let me know if you need help applying it.

[Comment 3 ByrneG 2010-07-30 09:37:19 UTC]

I applied the patch, recompiled the kernel and re-tested. The issue has not been resolved by this patch. The test was as follows:

1. $ mkdosfs -C floppy.img 1440
2. $ mkdir flpy
3. $ sudo mount -o loop floppy.img ./flpy/
# Gnome adds the "flpy" device and a "1.5 MB Filesystem" device to "Places"
4. $ sudo umount ./flpy
# Gnome removes the "flpy" device, but the "1.5 MB Filesystem" remains.
5. $ sudo losetup -a
# No results displayed (with or without sudo)
6. $ udisks --enumerate
# The list includes " /org/freedesktop/UDisks/devices/loop0"

There seems to be no way to unmount or detach the loop device from udisks, regardless of privileges, as the device isn't mounted...

$ udisks --unmount /dev/loop0
Unmount failed: Device is not mounted

Let me know if you need any additional info.

[Comment 4 Mike Pagano 2010-08-05 13:28:38 UTC]

Please test with gentoo-sources-2.6.35

[Comment 5 ByrneG 2010-08-06 10:02:14 UTC]

Kernel 2.6.35 resolves this issue.

[Comment 6 Samuli Suominen (RETIRED) 2010-08-07 17:36:09 UTC]

(In reply to comment #5)
> Kernel 2.6.35 resolves this issue.
> 

closing as fixed by 2.6.35 then