9:21 a.m.
v2:
- remove the overlay unconditionally
- document the overlay filename template
Peter Krempa (2):
qemu: snapshot: Delete leftover overlay files for <transient/> disks
docs: formatdomain: Document the temporary file for transient disks
docs/formatdomain.rst | 7 +++++++
src/qemu/qemu_snapshot.c | 10 ++++++----
2 files changed, 13 insertions(+), 4 deletions(-)
--
2.47.0
9:21 a.m.
New subject: [PATCH v2 1/2] qemu: snapshot: Delete leftover overlay files for <transient/> disks
When a VM is terminated by host reboot libvirt doesn't get to cleaning
out the temporary overlay file used for transient disks. Since we create
those files with a very specific suffix it's almost guaranteed that if
it exists it's a leftover from a libvirt run. Delete them instead of
complaining to preserve functionality.
Closes: https://gitlab.com/libvirt/libvirt/-/issues/684
Signed-off-by: Peter Krempa <pkrempa(a)redhat.com>
---
src/qemu/qemu_snapshot.c | 10 ++++++----
1 file changed, 6 insertions(+), 4 deletions(-)
diff --git a/src/qemu/qemu_snapshot.c b/src/qemu/qemu_snapshot.c
index 1187ebf276..795522da21 100644
--- a/src/qemu/qemu_snapshot.c
+++ b/src/qemu/qemu_snapshot.c
@@ -1287,10 +1287,12 @@ qemuSnapshotGetTransientDiskDef(virDomainDiskDef *domdisk,
domdisk->src->path, suffix);
if (virFileExists(snapdisk->src->path)) {
- virReportError(VIR_ERR_OPERATION_UNSUPPORTED,
- _("Overlay file '%1$s' for transient disk
'%2$s' already exists"),
- snapdisk->src->path, domdisk->dst);
- return NULL;
+ if (unlink(snapdisk->src->path) != 0) {
+ virReportSystemError(errno,
+ _("Failed to delete overlay file '%1$s' for
transient disk '%2$s'"),
+ snapdisk->src->path, domdisk->dst);
+ return NULL;
+ }
}
return g_steal_pointer(&snapdisk);
--
2.47.0
9:21 a.m.
New subject: [PATCH v2 2/2] docs: formatdomain: Document the temporary file for transient disks
Mention that hypervisors may need a temporary file and document the qemu
template for creating them.
Signed-off-by: Peter Krempa <pkrempa(a)redhat.com>
---
docs/formatdomain.rst | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/docs/formatdomain.rst b/docs/formatdomain.rst
index e6f09a728f..3253a28e5a 100644
--- a/docs/formatdomain.rst
+++ b/docs/formatdomain.rst
@@ -3479,6 +3479,13 @@ paravirtualized driver is specified via the ``disk`` element.
``shareBacking`` attribute should be set to ``yes``. Note that hypervisor
drivers may need to hotplug such disk and thus it works only with
configurations supporting hotplug. :since:`Since 7.4.0`
+
+ Hypervisors may need to store a temporary file containing the data written
+ by the domain while running, which may be stored in the same location
+ as the original source of the disk (The ``qemu`` driver stores the temporary
+ files as ``$(origsource).TRANSIENT-$(vmname)``, where ``$(origsource)`` is
+ the full original path of the disk source and ``$(vmname)`` is the name of the
+ domain).
``serial``
If present, this specify serial number of virtual hard drive. For example, it
may look like ``<serial>WD-WMAP9A966149</serial>``. Not supported for
--
2.47.0
9:22 a.m.
New subject: [PATCH v2 0/2] qemu: Don't complain when <transient/> disk
overlay is left behind
On Fri, Oct 18, 2024 at 04:21:01PM +0200, Peter Krempa wrote:
v2:
- remove the overlay unconditionally
- document the overlay filename template
Peter Krempa (2):
qemu: snapshot: Delete leftover overlay files for <transient/> disks
docs: formatdomain: Document the temporary file for transient disks
Reviewed-by: Daniel P. Berrangé <berrange(a)redhat.com>
With regards,
Daniel
--
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65
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65
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3 comments
2 participants
participants (2)
-
Daniel P. Berrangé -
Peter Krempa