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qemu: domain: skip chain detection to end of backing chain

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When a user provides the backing chain, we will not need to re-detect
all the backing stores again, but should move to the end of the user
specified chain. Additionally if a user provides a full terminated chain
we should not attempt any further detection.
This commit is contained in:
Peter Krempa 2017-09-29 12:02:29 +02:00
parent b0a46b609e
commit a92c4f7537
1 changed files with 41 additions and 11 deletions
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52
src/qemu/qemu_domain.c
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@ -6050,27 +6050,57 @@ qemuDomainDetermineDiskChain(virQEMUDriverPtr driver,
bool report_broken)
{
virQEMUDriverConfigPtr cfg = virQEMUDriverGetConfig(driver);
int ret = 0;
virStorageSourcePtr src = disk->src;
int ret = -1;
uid_t uid;
gid_t gid;
if (virStorageSourceIsEmpty(disk->src))
if (virStorageSourceIsEmpty(src)) {
ret = 0;
goto cleanup;
if (virStorageSourceHasBacking(disk->src)) {
if (force_probe)
virStorageSourceBackingStoreClear(disk->src);
else
goto cleanup;
}
qemuDomainGetImageIds(cfg, vm, disk->src, NULL, &uid, &gid);
if (virStorageSourceHasBacking(src)) {
if (force_probe) {
virStorageSourceBackingStoreClear(src);
} else {
/* skip to the end of the chain */
while (virStorageSourceIsBacking(src)) {
if (report_broken &&
virStorageFileSupportsAccess(src)) {
if (virStorageFileGetMetadata(disk->src,
if (qemuDomainStorageFileInit(driver, vm, src, disk->src) < 0)
goto cleanup;
if (virStorageFileAccess(src, F_OK) < 0) {
virStorageFileReportBrokenChain(errno, src, disk->src);
virStorageFileDeinit(src);
goto cleanup;
}
virStorageFileDeinit(src);
}
src = src->backingStore;
}
}
}
/* We skipped to the end of the chain. Skip detection if there's the
* terminator. (An allocated but empty backingStore) */
if (src->backingStore) {
ret = 0;
goto cleanup;
}
qemuDomainGetImageIds(cfg, vm, src, disk->src, &uid, &gid);
if (virStorageFileGetMetadata(src,
uid, gid,
cfg->allowDiskFormatProbing,
report_broken) < 0)
ret = -1;
goto cleanup;
ret = 0;
cleanup:
virObjectUnref(cfg);