[PATCH 4/4] backup: Allow configuring incremental backup per-disk individually
Peter Krempa
pkrempa at redhat.com
Tue Jul 7 15:23:03 UTC 2020
The semantics of the backup operation don't strictly require that all
disks being backed up are part of the same incremental part (when a disk
was checkpointed/backed up separately or in a different VM), or even
they may not have an previous checkpoint at all (e.g. when the disk
was freshly hotplugged to the vm).
In such cases we can still create a common checkpoint for all of them
and backup differences according to configuration.
This patch adds a per-disk configuration of the checkpoint to do the
incremental backup from via the 'incremental' attribute and allows
perform full backups via the 'backupmode' attribute.
Note that no changes to the qemu driver are necessary to take advantage
of this as we already obey the per-disk 'incremental' field.
https://bugzilla.redhat.com/show_bug.cgi?id=1829829
Signed-off-by: Peter Krempa <pkrempa at redhat.com>
---
v2:
- backupmode=full incremental="..." is now rejected by the RNG
schema
- test output changes as we now validate virDomainBackupAlignDisks
- typo fix
docs/formatbackup.rst | 11 +++++
docs/schemas/domainbackup.rng | 23 +++++++++
src/conf/backup_conf.c | 49 ++++++++++++++++++-
src/conf/backup_conf.h | 11 +++++
tests/domainbackupxml2xmlin/backup-pull.xml | 12 +++++
.../backup-pull-encrypted.xml | 6 +--
.../backup-pull-internal-invalid.xml | 6 +--
.../backup-pull-seclabel.xml | 4 +-
tests/domainbackupxml2xmlout/backup-pull.xml | 14 +++++-
.../backup-push-encrypted.xml | 6 +--
.../backup-push-seclabel.xml | 4 +-
tests/domainbackupxml2xmlout/backup-push.xml | 2 +-
tests/domainbackupxml2xmlout/empty.xml | 2 +-
13 files changed, 133 insertions(+), 17 deletions(-)
diff --git a/docs/formatbackup.rst b/docs/formatbackup.rst
index 17431fe51a..1b9e6ebb22 100644
--- a/docs/formatbackup.rst
+++ b/docs/formatbackup.rst
@@ -69,6 +69,17 @@ were supplied). The following child elements and attributes are supported:
should take part in the backup and using ``no`` excludes the disk from
the backup.
+ ``backupmode``
+ This attribute overrides the implied backup mode inherited from the
+ definition of the backup itself. Value ``full`` forces a full backup
+ even if the backup calls for an incremental backup, and ``incremental``
+ coupled with the attribute ``incremental='CHECKPOINTNAME`` for the disk
+ forces an incremental backup from ``CHECKPOINTNAME``.
+
+ ``incremental``
+ An optional attribute giving the name of an existing checkpoint of the
+ domain which overrides the one set by the ``<incremental>`` element.
+
``exportname``
Allows modification of the NBD export name for the given disk. By
default equal to disk target. Valid only for pull mode backups.
diff --git a/docs/schemas/domainbackup.rng b/docs/schemas/domainbackup.rng
index c0e17f512b..579b62a658 100644
--- a/docs/schemas/domainbackup.rng
+++ b/docs/schemas/domainbackup.rng
@@ -96,6 +96,27 @@
</element>
</define>
+
+ <define name='backupDiskMode'>
+ <optional>
+ <choice>
+ <attribute name='backupmode'>
+ <value>full</value>
+ </attribute>
+ <group>
+ <optional>
+ <attribute name='backupmode'>
+ <value>incremental</value>
+ </attribute>
+ </optional>
+ <optional>
+ <attribute name='incremental'/>
+ </optional>
+ </group>
+ </choice>
+ </optional>
+ </define>
+
<define name='backupPushDriver'>
<optional>
<element name='driver'>
@@ -134,6 +155,7 @@
<attribute name='name'>
<ref name='diskTarget'/>
</attribute>
+ <ref name='backupDiskMode'/>
<choice>
<group>
<attribute name='backup'>
@@ -203,6 +225,7 @@
<attribute name='name'>
<ref name='diskTarget'/>
</attribute>
+ <ref name='backupDiskMode'/>
<optional>
<attribute name='exportname'>
<text/>
diff --git a/src/conf/backup_conf.c b/src/conf/backup_conf.c
index 5e4144d371..02319f7245 100644
--- a/src/conf/backup_conf.c
+++ b/src/conf/backup_conf.c
@@ -56,6 +56,13 @@ VIR_ENUM_IMPL(virDomainBackupDiskState,
"cancelling",
"cancelled");
+VIR_ENUM_DECL(virDomainBackupDiskBackupMode);
+VIR_ENUM_IMPL(virDomainBackupDiskBackupMode,
+ VIR_DOMAIN_BACKUP_DISK_BACKUP_MODE_LAST,
+ "",
+ "full",
+ "incremental");
+
void
virDomainBackupDefFree(virDomainBackupDefPtr def)
{
@@ -100,6 +107,7 @@ virDomainBackupDiskDefParseXML(xmlNodePtr node,
g_autofree char *driver = NULL;
g_autofree char *backup = NULL;
g_autofree char *state = NULL;
+ g_autofree char *backupmode = NULL;
int tmp;
xmlNodePtr srcNode;
unsigned int storageSourceParseFlags = 0;
@@ -137,6 +145,19 @@ virDomainBackupDiskDefParseXML(xmlNodePtr node,
def->exportbitmap = virXMLPropString(node, "exportbitmap");
}
+ if ((backupmode = virXMLPropString(node, "backupmode"))) {
+ if ((tmp = virDomainBackupDiskBackupModeTypeFromString(backupmode)) < 0) {
+ virReportError(VIR_ERR_XML_ERROR,
+ _("invalid backupmode '%s' of disk '%s'"),
+ backupmode, def->name);
+ return -1;
+ }
+
+ def->backupmode = tmp;
+ }
+
+ def->incremental = virXMLPropString(node, "incremental");
+
if (internal) {
if (!(state = virXMLPropString(node, "state")) ||
(tmp = virDomainBackupDiskStateTypeFromString(state)) < 0) {
@@ -376,6 +397,13 @@ virDomainBackupDiskDefFormat(virBufferPtr buf,
if (disk->backup == VIR_TRISTATE_BOOL_YES) {
virBufferAsprintf(&attrBuf, " type='%s'", virStorageTypeToString(disk->store->type));
+ if (disk->backupmode != VIR_DOMAIN_BACKUP_DISK_BACKUP_MODE_DEFAULT) {
+ virBufferAsprintf(&attrBuf, " backupmode='%s'",
+ virDomainBackupDiskBackupModeTypeToString(disk->backupmode));
+ }
+
+ virBufferEscapeString(&attrBuf, " incremental='%s'", disk->incremental);
+
virBufferEscapeString(&attrBuf, " exportname='%s'", disk->exportname);
virBufferEscapeString(&attrBuf, " exportbitmap='%s'", disk->exportbitmap);
@@ -524,6 +552,16 @@ virDomainBackupAlignDisks(virDomainBackupDefPtr def,
return -1;
}
+ if (backupdisk->backupmode == VIR_DOMAIN_BACKUP_DISK_BACKUP_MODE_INCREMENTAL &&
+ !backupdisk->incremental &&
+ !def->incremental) {
+ virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
+ _("'incremental' backup mode of disk '%s' requires setting 'incremental' field for disk or backup"),
+ backupdisk->name);
+ return -1;
+ }
+
+
if (backupdisk->backup == VIR_TRISTATE_BOOL_YES &&
virDomainBackupDefAssignStore(backupdisk, domdisk->src, suffix) < 0)
return -1;
@@ -561,7 +599,16 @@ virDomainBackupAlignDisks(virDomainBackupDefPtr def,
for (i = 0; i < def->ndisks; i++) {
virDomainBackupDiskDefPtr backupdisk = &def->disks[i];
- if (def->incremental && !backupdisk->incremental)
+ if (backupdisk->backupmode == VIR_DOMAIN_BACKUP_DISK_BACKUP_MODE_DEFAULT) {
+ if (def->incremental || backupdisk->incremental) {
+ backupdisk->backupmode = VIR_DOMAIN_BACKUP_DISK_BACKUP_MODE_INCREMENTAL;
+ } else {
+ backupdisk->backupmode = VIR_DOMAIN_BACKUP_DISK_BACKUP_MODE_FULL;
+ }
+ }
+
+ if (!backupdisk->incremental &&
+ backupdisk->backupmode == VIR_DOMAIN_BACKUP_DISK_BACKUP_MODE_INCREMENTAL)
backupdisk->incremental = g_strdup(def->incremental);
}
diff --git a/src/conf/backup_conf.h b/src/conf/backup_conf.h
index aa2d6d4b68..bda2bdcfe4 100644
--- a/src/conf/backup_conf.h
+++ b/src/conf/backup_conf.h
@@ -45,12 +45,23 @@ typedef enum {
VIR_DOMAIN_BACKUP_DISK_STATE_LAST
} virDomainBackupDiskState;
+
+typedef enum {
+ VIR_DOMAIN_BACKUP_DISK_BACKUP_MODE_DEFAULT = 0,
+ VIR_DOMAIN_BACKUP_DISK_BACKUP_MODE_FULL,
+ VIR_DOMAIN_BACKUP_DISK_BACKUP_MODE_INCREMENTAL,
+
+ VIR_DOMAIN_BACKUP_DISK_BACKUP_MODE_LAST
+} virDomainBackupDiskBackupMode;
+
+
/* Stores disk-backup information */
typedef struct _virDomainBackupDiskDef virDomainBackupDiskDef;
typedef virDomainBackupDiskDef *virDomainBackupDiskDefPtr;
struct _virDomainBackupDiskDef {
char *name; /* name matching the <target dev='...' of the domain */
virTristateBool backup; /* whether backup is requested */
+ virDomainBackupDiskBackupMode backupmode;
char *incremental; /* name of the starting point checkpoint of an incremental backup */
char *exportname; /* name of the NBD export for pull mode backup */
char *exportbitmap; /* name of the bitmap exposed in NBD for pull mode backup */
diff --git a/tests/domainbackupxml2xmlin/backup-pull.xml b/tests/domainbackupxml2xmlin/backup-pull.xml
index c0bea4771d..c51f0995ac 100644
--- a/tests/domainbackupxml2xmlin/backup-pull.xml
+++ b/tests/domainbackupxml2xmlin/backup-pull.xml
@@ -6,5 +6,17 @@
<scratch file='/path/to/file'/>
</disk>
<disk name='hda' backup='no'/>
+ <disk name='vdc' type='file' backupmode='full'>
+ <scratch file='/path/to/file'/>
+ </disk>
+ <disk name='vdd' type='file' backupmode='incremental'>
+ <scratch file='/path/to/file'/>
+ </disk>
+ <disk name='vde' type='file' backupmode='incremental' incremental='blah'>
+ <scratch file='/path/to/file'/>
+ </disk>
+ <disk name='vdf' type='file' incremental='bleh'>
+ <scratch file='/path/to/file'/>
+ </disk>
</disks>
</domainbackup>
diff --git a/tests/domainbackupxml2xmlout/backup-pull-encrypted.xml b/tests/domainbackupxml2xmlout/backup-pull-encrypted.xml
index 3c3042111d..42051d1d24 100644
--- a/tests/domainbackupxml2xmlout/backup-pull-encrypted.xml
+++ b/tests/domainbackupxml2xmlout/backup-pull-encrypted.xml
@@ -2,7 +2,7 @@
<incremental>1525889631</incremental>
<server transport='tcp' tls='yes' name='localhost' port='10809'/>
<disks>
- <disk name='vda' backup='yes' type='file' exportname='test-vda' exportbitmap='blah'>
+ <disk name='vda' backup='yes' type='file' backupmode='incremental' incremental='1525889631' exportname='test-vda' exportbitmap='blah'>
<driver type='qcow2'/>
<scratch file='/path/to/file'>
<encryption format='luks'>
@@ -10,7 +10,7 @@
</encryption>
</scratch>
</disk>
- <disk name='vdb' backup='yes' type='file' exportname='test-vda' exportbitmap='blah'>
+ <disk name='vdb' backup='yes' type='file' backupmode='incremental' incremental='1525889631' exportname='test-vda' exportbitmap='blah'>
<driver type='qcow2'/>
<scratch file='/path/to/file'>
<encryption format='luks'>
@@ -18,7 +18,7 @@
</encryption>
</scratch>
</disk>
- <disk name='vdc' backup='yes' type='block'>
+ <disk name='vdc' backup='yes' type='block' backupmode='incremental' incremental='1525889631'>
<driver type='qcow2'/>
<scratch dev='/dev/block'>
<encryption format='luks'>
diff --git a/tests/domainbackupxml2xmlout/backup-pull-internal-invalid.xml b/tests/domainbackupxml2xmlout/backup-pull-internal-invalid.xml
index 9702978ce0..092b6bf8a7 100644
--- a/tests/domainbackupxml2xmlout/backup-pull-internal-invalid.xml
+++ b/tests/domainbackupxml2xmlout/backup-pull-internal-invalid.xml
@@ -2,7 +2,7 @@
<incremental>1525889631</incremental>
<server transport='tcp' tls='yes' name='localhost' port='10809'/>
<disks>
- <disk name='vda' backup='yes' state='running' type='file' exportname='test-vda' exportbitmap='blah'>
+ <disk name='vda' backup='yes' state='running' type='file' backupmode='incremental' incremental='1525889631' exportname='test-vda' exportbitmap='blah'>
<driver type='qcow2'/>
<scratch file='/path/to/file'>
<encryption format='luks'>
@@ -10,7 +10,7 @@
</encryption>
</scratch>
</disk>
- <disk name='vdb' backup='yes' state='complete' type='file' exportname='test-vda' exportbitmap='blah'>
+ <disk name='vdb' backup='yes' state='complete' type='file' backupmode='incremental' incremental='1525889631' exportname='test-vda' exportbitmap='blah'>
<driver type='qcow2'/>
<scratch file='/path/to/file'>
<encryption format='luks'>
@@ -18,7 +18,7 @@
</encryption>
</scratch>
</disk>
- <disk name='vdc' backup='yes' state='running' type='block'>
+ <disk name='vdc' backup='yes' state='running' type='block' backupmode='incremental' incremental='1525889631'>
<driver type='qcow2'/>
<scratch dev='/dev/block'>
<encryption format='luks'>
diff --git a/tests/domainbackupxml2xmlout/backup-pull-seclabel.xml b/tests/domainbackupxml2xmlout/backup-pull-seclabel.xml
index 38330394f7..385d949ae3 100644
--- a/tests/domainbackupxml2xmlout/backup-pull-seclabel.xml
+++ b/tests/domainbackupxml2xmlout/backup-pull-seclabel.xml
@@ -2,13 +2,13 @@
<incremental>1525889631</incremental>
<server transport='tcp' name='localhost' port='10809'/>
<disks>
- <disk name='vda' backup='yes' type='file' exportname='test-vda' exportbitmap='blah'>
+ <disk name='vda' backup='yes' type='file' backupmode='incremental' incremental='1525889631' exportname='test-vda' exportbitmap='blah'>
<driver type='qcow2'/>
<scratch file='/path/to/file'>
<seclabel model='dac' relabel='no'/>
</scratch>
</disk>
- <disk name='vdb' backup='yes' type='block'>
+ <disk name='vdb' backup='yes' type='block' backupmode='incremental' incremental='1525889631'>
<driver type='qcow2'/>
<scratch dev='/dev/block'>
<seclabel model='dac' relabel='no'/>
diff --git a/tests/domainbackupxml2xmlout/backup-pull.xml b/tests/domainbackupxml2xmlout/backup-pull.xml
index 4952270a5a..1762ba72b5 100644
--- a/tests/domainbackupxml2xmlout/backup-pull.xml
+++ b/tests/domainbackupxml2xmlout/backup-pull.xml
@@ -2,10 +2,22 @@
<incremental>1525889631</incremental>
<server transport='tcp' name='localhost' port='10809'/>
<disks>
- <disk name='vda' backup='yes' type='file'>
+ <disk name='vda' backup='yes' type='file' backupmode='incremental' incremental='1525889631'>
<scratch file='/path/to/file'/>
</disk>
<disk name='hda' backup='no'/>
+ <disk name='vdc' backup='yes' type='file' backupmode='full'>
+ <scratch file='/path/to/file'/>
+ </disk>
+ <disk name='vdd' backup='yes' type='file' backupmode='incremental' incremental='1525889631'>
+ <scratch file='/path/to/file'/>
+ </disk>
+ <disk name='vde' backup='yes' type='file' backupmode='incremental' incremental='blah'>
+ <scratch file='/path/to/file'/>
+ </disk>
+ <disk name='vdf' backup='yes' type='file' backupmode='incremental' incremental='bleh'>
+ <scratch file='/path/to/file'/>
+ </disk>
<disk name='vdextradisk' backup='no'/>
</disks>
</domainbackup>
diff --git a/tests/domainbackupxml2xmlout/backup-push-encrypted.xml b/tests/domainbackupxml2xmlout/backup-push-encrypted.xml
index 2a5aad93cd..3b664b0dcb 100644
--- a/tests/domainbackupxml2xmlout/backup-push-encrypted.xml
+++ b/tests/domainbackupxml2xmlout/backup-push-encrypted.xml
@@ -1,7 +1,7 @@
<domainbackup mode='push'>
<incremental>1525889631</incremental>
<disks>
- <disk name='vda' backup='yes' type='file'>
+ <disk name='vda' backup='yes' type='file' backupmode='incremental' incremental='1525889631'>
<driver type='qcow2'/>
<target file='/path/to/file'>
<encryption format='luks'>
@@ -9,7 +9,7 @@
</encryption>
</target>
</disk>
- <disk name='vdb' backup='yes' type='file'>
+ <disk name='vdb' backup='yes' type='file' backupmode='incremental' incremental='1525889631'>
<driver type='raw'/>
<target file='/path/to/file'>
<encryption format='luks'>
@@ -17,7 +17,7 @@
</encryption>
</target>
</disk>
- <disk name='vdc' backup='yes' type='block'>
+ <disk name='vdc' backup='yes' type='block' backupmode='incremental' incremental='1525889631'>
<driver type='qcow2'/>
<target dev='/dev/block'>
<encryption format='luks'>
diff --git a/tests/domainbackupxml2xmlout/backup-push-seclabel.xml b/tests/domainbackupxml2xmlout/backup-push-seclabel.xml
index 59af3e6a6c..9a0d2b3061 100644
--- a/tests/domainbackupxml2xmlout/backup-push-seclabel.xml
+++ b/tests/domainbackupxml2xmlout/backup-push-seclabel.xml
@@ -1,13 +1,13 @@
<domainbackup mode='push'>
<incremental>1525889631</incremental>
<disks>
- <disk name='vda' backup='yes' type='file'>
+ <disk name='vda' backup='yes' type='file' backupmode='incremental' incremental='1525889631'>
<driver type='raw'/>
<target file='/path/to/file'>
<seclabel model='dac' relabel='no'/>
</target>
</disk>
- <disk name='vdb' backup='yes' type='block'>
+ <disk name='vdb' backup='yes' type='block' backupmode='incremental' incremental='1525889631'>
<driver type='qcow2'/>
<target dev='/dev/block'>
<seclabel model='dac' relabel='no'/>
diff --git a/tests/domainbackupxml2xmlout/backup-push.xml b/tests/domainbackupxml2xmlout/backup-push.xml
index bc11a93d94..317dcf6e47 100644
--- a/tests/domainbackupxml2xmlout/backup-push.xml
+++ b/tests/domainbackupxml2xmlout/backup-push.xml
@@ -1,7 +1,7 @@
<domainbackup mode='push'>
<incremental>1525889631</incremental>
<disks>
- <disk name='vda' backup='yes' type='file'>
+ <disk name='vda' backup='yes' type='file' backupmode='incremental' incremental='1525889631'>
<driver type='raw'/>
<target file='/path/to/file'/>
</disk>
diff --git a/tests/domainbackupxml2xmlout/empty.xml b/tests/domainbackupxml2xmlout/empty.xml
index 52d2b4f0af..b1cbd154ab 100644
--- a/tests/domainbackupxml2xmlout/empty.xml
+++ b/tests/domainbackupxml2xmlout/empty.xml
@@ -1,6 +1,6 @@
<domainbackup mode='push'>
<disks>
- <disk name='vdextradisk' backup='yes' type='file'>
+ <disk name='vdextradisk' backup='yes' type='file' backupmode='full'>
<target file='/fake/vdextradisk.qcow2.SUFFIX'/>
</disk>
</disks>
--
2.26.2
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