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tests: qemublock: Add testing of bitmap merging for incremental backups
Add test code which will crawl a fake internal list of checkpoints and generate the list of bitmaps for merging to gather the final bitmap for the backup. The initial tests cover the basic case of all bitmaps being present in the top layer of the backing chain. Signed-off-by: Peter Krempa <pkrempa@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com>
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@ -28,6 +28,7 @@
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# include "qemu/qemu_block.h"
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# include "qemu/qemu_qapi.h"
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# include "qemu/qemu_monitor_json.h"
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# include "qemu/qemu_backup.h"
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# include "qemu/qemu_command.h"
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@ -558,6 +559,145 @@ testQemuDetectBitmaps(const void *opaque)
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}
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static virStorageSourcePtr
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testQemuBackupIncrementalBitmapCalculateGetFakeImage(size_t idx)
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{
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virStorageSourcePtr ret;
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if (!(ret = virStorageSourceNew()))
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abort();
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ret->type = VIR_STORAGE_TYPE_FILE;
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ret->format = VIR_STORAGE_FILE_QCOW2;
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ret->path = g_strdup_printf("/image%zu", idx);
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ret->nodestorage = g_strdup_printf("libvirt-%zu-storage", idx);
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ret->nodeformat = g_strdup_printf("libvirt-%zu-format", idx);
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return ret;
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}
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static virStorageSourcePtr
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testQemuBackupIncrementalBitmapCalculateGetFakeChain(void)
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{
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virStorageSourcePtr ret;
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virStorageSourcePtr n;
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size_t i;
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n = ret = testQemuBackupIncrementalBitmapCalculateGetFakeImage(1);
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for (i = 2; i < 10; i++) {
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n->backingStore = testQemuBackupIncrementalBitmapCalculateGetFakeImage(i);
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n = n->backingStore;
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}
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return ret;
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}
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typedef virDomainMomentDefPtr testMomentList;
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static void
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testMomentListFree(testMomentList *list)
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{
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testMomentList *tmp = list;
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if (!list)
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return;
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while (*tmp) {
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virObjectUnref(*tmp);
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tmp++;
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}
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g_free(list);
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}
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G_DEFINE_AUTOPTR_CLEANUP_FUNC(testMomentList, testMomentListFree);
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static virDomainMomentDefPtr
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testQemuBackupGetIncrementalMoment(const char *name)
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{
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virDomainCheckpointDefPtr checkpoint = NULL;
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if (!(checkpoint = virDomainCheckpointDefNew()))
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abort();
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checkpoint->parent.name = g_strdup(name);
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return (virDomainMomentDefPtr) checkpoint;
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}
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static virDomainMomentDefPtr *
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testQemuBackupGetIncremental(const char *incFrom)
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{
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const char *checkpoints[] = {"current", "d", "c", "b", "a"};
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virDomainMomentDefPtr *incr;
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size_t i;
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incr = g_new0(virDomainMomentDefPtr, G_N_ELEMENTS(checkpoints) + 1);
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for (i = 0; i < G_N_ELEMENTS(checkpoints); i++) {
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incr[i] = testQemuBackupGetIncrementalMoment(checkpoints[i]);
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if (STREQ(incFrom, checkpoints[i]))
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break;
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}
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return incr;
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}
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static const char *backupDataPrefix = "qemublocktestdata/backupmerge/";
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struct testQemuBackupIncrementalBitmapCalculateData {
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const char *name;
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virStorageSourcePtr chain;
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const char *incremental;
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const char *nodedatafile;
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};
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static int
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testQemuBackupIncrementalBitmapCalculate(const void *opaque)
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{
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const struct testQemuBackupIncrementalBitmapCalculateData *data = opaque;
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g_autoptr(virJSONValue) nodedatajson = NULL;
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g_autoptr(virHashTable) nodedata = NULL;
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g_autoptr(virJSONValue) mergebitmaps = NULL;
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g_autofree char *actual = NULL;
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g_autofree char *expectpath = NULL;
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g_autoptr(testMomentList) incremental = NULL;
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expectpath = g_strdup_printf("%s/%s%s-out.json", abs_srcdir,
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backupDataPrefix, data->name);
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if (!(nodedatajson = virTestLoadFileJSON(bitmapDetectPrefix, data->nodedatafile,
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".json", NULL)))
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return -1;
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if (!(nodedata = qemuMonitorJSONBlockGetNamedNodeDataJSON(nodedatajson))) {
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VIR_TEST_VERBOSE("failed to load nodedata JSON\n");
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return -1;
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}
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incremental = testQemuBackupGetIncremental(data->incremental);
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if (!(mergebitmaps = qemuBackupDiskPrepareOneBitmapsChain(incremental,
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data->chain,
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nodedata,
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"testdisk"))) {
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VIR_TEST_VERBOSE("failed to calculate merged bitmaps");
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return -1;
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}
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if (!(actual = virJSONValueToString(mergebitmaps, true)))
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return -1;
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return virTestCompareToFile(actual, expectpath);
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}
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static int
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mymain(void)
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{
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@ -566,12 +706,16 @@ mymain(void)
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struct testBackingXMLjsonXMLdata xmljsonxmldata;
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struct testQemuDiskXMLToJSONData diskxmljsondata;
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struct testQemuImageCreateData imagecreatedata;
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struct testQemuBackupIncrementalBitmapCalculateData backupbitmapcalcdata;
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char *capslatest_x86_64 = NULL;
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virQEMUCapsPtr caps_x86_64 = NULL;
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g_autoptr(virStorageSource) bitmapSourceChain = NULL;
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if (qemuTestDriverInit(&driver) < 0)
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return EXIT_FAILURE;
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bitmapSourceChain = testQemuBackupIncrementalBitmapCalculateGetFakeChain();
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diskxmljsondata.driver = &driver;
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imagecreatedata.driver = &driver;
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@ -779,6 +923,22 @@ mymain(void)
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TEST_BITMAP_DETECT("synthetic");
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TEST_BITMAP_DETECT("snapshots");
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# define TEST_BACKUP_BITMAP_CALCULATE(testname, source, incrbackup, named) \
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do { \
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backupbitmapcalcdata.name = testname; \
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backupbitmapcalcdata.chain = source; \
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backupbitmapcalcdata.incremental = incrbackup; \
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backupbitmapcalcdata.nodedatafile = named; \
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if (virTestRun("incremental backup bitmap " testname, \
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testQemuBackupIncrementalBitmapCalculate, \
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&backupbitmapcalcdata) < 0) \
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ret = -1; \
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} while (0)
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TEST_BACKUP_BITMAP_CALCULATE("basic-flat", bitmapSourceChain, "current", "basic");
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TEST_BACKUP_BITMAP_CALCULATE("basic-intermediate", bitmapSourceChain, "d", "basic");
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TEST_BACKUP_BITMAP_CALCULATE("basic-deep", bitmapSourceChain, "a", "basic");
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cleanup:
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virHashFree(diskxmljsondata.schema);
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qemuTestDriverFree(&driver);
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tests/qemublocktestdata/backupmerge/basic-deep-out.json
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22
tests/qemublocktestdata/backupmerge/basic-deep-out.json
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@ -0,0 +1,22 @@
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[
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{
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"node": "libvirt-1-format",
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"name": "current"
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},
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{
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"node": "libvirt-1-format",
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"name": "d"
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},
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{
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"node": "libvirt-1-format",
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"name": "c"
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},
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{
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"node": "libvirt-1-format",
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"name": "b"
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},
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{
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"node": "libvirt-1-format",
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"name": "a"
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}
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]
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6
tests/qemublocktestdata/backupmerge/basic-flat-out.json
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6
tests/qemublocktestdata/backupmerge/basic-flat-out.json
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[
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{
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"node": "libvirt-1-format",
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"name": "current"
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}
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]
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[
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{
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"node": "libvirt-1-format",
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"name": "current"
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},
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{
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"node": "libvirt-1-format",
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"name": "d"
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}
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]
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