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[Qemu-devel] [Bug 1077838] Re: qemu-nbd -r -c taints device for subseque
From: |
Launchpad Bug Tracker |
Subject: |
[Qemu-devel] [Bug 1077838] Re: qemu-nbd -r -c taints device for subsequent usage, even after -d |
Date: |
Tue, 15 Jan 2013 03:05:13 -0000 |
This bug was fixed in the package qemu-kvm - 1.0+noroms-0ubuntu14.6
---------------
qemu-kvm (1.0+noroms-0ubuntu14.6) precise-proposed; urgency=low
* Fix qemu-kvm.upstart: just don't run in a container. Otherwise we'll
still try to load/unload kernel modules. Also undo the || true after
sysfs writes. Since setting those is a part of configuring qemu-kvm
on the host, failing when they fail makes sense.
qemu-kvm (1.0+noroms-0ubuntu14.5) precise-proposed; urgency=low
* add udev to qemu-kvm Depends to ensure that postinst succeeds.
(LP: #1080912)
qemu-kvm (1.0+noroms-0ubuntu14.4) precise-proposed; urgency=low
[ Serge Hallyn ]
* debian/qemu-kvm.postinst: use udevadm trigger to change /dev/kvm perms as
recommended by Steve Langasek (LP: #1057024)
* apply debian/patches/nbd-fixes-to-read-only-handling.patch from upstream to
make read-write mount after read-only mount work. (LP: #1077838)
[ Robert Collins ]
* Fix upstart job to succeed if ksm settings can't be altered in the same way
other settings are handled. (LP: #1078530)
-- Serge Hallyn <address@hidden> Thu, 20 Dec 2012 12:34:52 -0600
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https://bugs.launchpad.net/bugs/1077838
Title:
qemu-nbd -r -c taints device for subsequent usage, even after -d
Status in QEMU:
In Progress
Status in “qemu-kvm” package in Ubuntu:
Fix Released
Status in “qemu-kvm” source package in Precise:
Fix Released
Status in “qemu-kvm” source package in Quantal:
Fix Released
Bug description:
Something about qemu-nbd -r -c /dev/nbd0 someimg leaves cruft behind -
subsequent connections get marked readonly.
This is on quantal, haven't checked precise or raring.
To demonstrate:
# use one image
qemu-img create -f qcow2 /tmp/1.qcow2 100M
sudo qemu-nbd -c /dev/nbd2 /tmp/1.qcow2
sudo mkfs -t ext4 /dev/nbd2
sudo qemu-nbd -d /dev/nbd2
# use a second one on the same nbd device, shows that reuse works:
qemu-img create -f qcow2 /tmp/2.qcow2 100M
sudo qemu-nbd -c /dev/nbd2 /tmp/2.qcow2
sudo mkfs -t ext4 /dev/nbd2
sudo qemu-nbd -d /dev/nbd2
# connect an image in read only mode
sudo qemu-nbd -r -c /dev/nbd2 /tmp/2.qcow2
sudo dumpe2fs /dev/nbd2 | head -n 3
sudo qemu-nbd -d /dev/nbd2
# now try to reuse in read-write mode again:
qemu-img create -f qcow2 /tmp/3.qcow2 100M
sudo qemu-nbd -c /dev/nbd2 /tmp/3.qcow2
sudo mkfs -t ext4 /dev/nbd2
# here it goes boom:
mke2fs 1.42.5 (29-Jul-2012)
/dev/nbd2: Operation not permitted while setting up superblock
# still need to cleanup
sudo qemu-nbd -d /dev/nbd2
===============================
SRU Justification:
1. Impact: mounting an nbd device as read-write after doing so read-only
will cause the mount to erroneously (and quietly) be read-only.
2. Development fix: have qemu-nbd set the device to read-write when asked,
rather than only setting read-only.
3. Stable fix: same as development fix
4. Test case: See above
5. Regression potential: The patch is localized to the handling of read-only
flag in qemu-nbd, so any regression should not affect anything else.
===============================
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- [Qemu-devel] [Bug 1077838] Re: qemu-nbd -r -c taints device for subsequent usage, even after -d, Adam Conrad, 2013/01/02
- [Qemu-devel] [Bug 1077838] Re: qemu-nbd -r -c taints device for subsequent usage, even after -d, Serge Hallyn, 2013/01/02
- [Qemu-devel] [Bug 1077838] Re: qemu-nbd -r -c taints device for subsequent usage, even after -d, Launchpad Bug Tracker, 2013/01/12
- [Qemu-devel] [Bug 1077838] Re: qemu-nbd -r -c taints device for subsequent usage, even after -d, Launchpad Bug Tracker, 2013/01/14
- [Qemu-devel] [Bug 1077838] Re: qemu-nbd -r -c taints device for subsequent usage, even after -d,
Launchpad Bug Tracker <=