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qemu: managedsave: Add support for compressing managed save images

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The regular save image code has the support to compress images using a
specified algorithm. This was not implemented for managed save although
it shares most of the backend code.
This commit is contained in:
Peter Krempa 2013-10-09 18:05:43 +02:00
parent 97973ebb7a
commit 550cae847b
2 changed files with 24 additions and 5 deletions
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6
src/qemu/qemu.conf
View File

@ -269,9 +269,9 @@
# saving a domain in order to save disk space; the list above is in descending
# order by performance and ascending order by compression ratio.
#
# save_image_format is used when you use 'virsh save' at scheduled
# saving, and it is an error if the specified save_image_format is
# not valid, or the requested compression program can't be found.
# save_image_format is used when you use 'virsh save' or 'virsh managedsave'
# at scheduled saving, and it is an error if the specified save_image_format
# is not valid, or the requested compression program can't be found.
#
# dump_image_format is used when you use 'virsh dump' at emergency
# crashdump, and if the specified dump_image_format is not valid, or

23
src/qemu/qemu_driver.c
View File

@ -3232,6 +3232,8 @@ static int
qemuDomainManagedSave(virDomainPtr dom, unsigned int flags)
{
virQEMUDriverPtr driver = dom->conn->privateData;
virQEMUDriverConfigPtr cfg = NULL;
int compressed = QEMU_SAVE_FORMAT_RAW;
virDomainObjPtr vm;
char *name = NULL;
int ret = -1;
@ -3257,13 +3259,29 @@ qemuDomainManagedSave(virDomainPtr dom, unsigned int flags)
goto cleanup;
}
cfg = virQEMUDriverGetConfig(driver);
if (cfg->saveImageFormat) {
compressed = qemuSaveCompressionTypeFromString(cfg->saveImageFormat);
if (compressed < 0) {
virReportError(VIR_ERR_OPERATION_FAILED, "%s",
_("Invalid save image format specified "
"in configuration file"));
goto cleanup;
}
if (!qemuCompressProgramAvailable(compressed)) {
virReportError(VIR_ERR_OPERATION_FAILED, "%s",
_("Compression program for image format "
"in configuration file isn't available"));
goto cleanup;
}
}
if (!(name = qemuDomainManagedSavePath(driver, vm)))
goto cleanup;
VIR_INFO("Saving state of domain '%s' to '%s'", vm->def->name, name);
if ((ret = qemuDomainSaveInternal(driver, dom, vm, name,
QEMU_SAVE_FORMAT_RAW,
if ((ret = qemuDomainSaveInternal(driver, dom, vm, name, compressed,
NULL, flags)) == 0)
vm->hasManagedSave = true;
@ -3273,6 +3291,7 @@ cleanup:
if (vm)
virObjectUnlock(vm);
VIR_FREE(name);
virObjectUnref(cfg);
return ret;
}