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qemu: snapshot: Use new APIs to detect presence of existing storage files

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Use the new storage driver based "stat" api to detect exiting files just
as we did with local files.
This commit is contained in:
Peter Krempa 2014-02-11 17:18:35 +01:00
parent 8f4091d677
commit 7183d7d2e8
1 changed files with 26 additions and 32 deletions
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58
src/qemu/qemu_driver.c
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@ -12367,7 +12367,6 @@ qemuDomainSnapshotPrepareDiskExternalOverlayInactive(virDomainSnapshotDiskDefPtr
}
static int
qemuDomainSnapshotPrepareDiskExternal(virConnectPtr conn,
virDomainDiskDefPtr disk,
@ -12375,7 +12374,8 @@ qemuDomainSnapshotPrepareDiskExternal(virConnectPtr conn,
bool active,
bool reuse)
{
int actualType;
virStorageFilePtr snapfile = NULL;
int ret = -1;
struct stat st;
if (qemuTranslateSnapshotDiskSourcePool(conn, snapdisk) < 0)
@ -12398,40 +12398,34 @@ qemuDomainSnapshotPrepareDiskExternal(virConnectPtr conn,
return -1;
}
actualType = virDomainSnapshotDiskGetActualType(snapdisk);
if (!(snapfile = virStorageFileInitFromSnapshotDef(snapdisk)))
return -1;
switch ((enum virDomainDiskType) actualType) {
case VIR_DOMAIN_DISK_TYPE_BLOCK:
case VIR_DOMAIN_DISK_TYPE_FILE:
if (stat(snapdisk->file, &st) < 0) {
if (errno != ENOENT) {
virReportSystemError(errno,
_("unable to stat for disk %s: %s"),
snapdisk->name, snapdisk->file);
return -1;
} else if (reuse) {
virReportSystemError(errno,
_("missing existing file for disk %s: %s"),
snapdisk->name, snapdisk->file);
return -1;
}
} else if (!S_ISBLK(st.st_mode) && st.st_size && !reuse) {
virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
_("external snapshot file for disk %s already "
"exists and is not a block device: %s"),
snapdisk->name, snapdisk->file);
return -1;
if (virStorageFileStat(snapfile, &st) < 0) {
if (errno != ENOENT) {
virReportSystemError(errno,
_("unable to stat for disk %s: %s"),
snapdisk->name, snapdisk->file);
goto cleanup;
} else if (reuse) {
virReportSystemError(errno,
_("missing existing file for disk %s: %s"),
snapdisk->name, snapdisk->file);
goto cleanup;
}
break;
case VIR_DOMAIN_DISK_TYPE_NETWORK:
case VIR_DOMAIN_DISK_TYPE_DIR:
case VIR_DOMAIN_DISK_TYPE_VOLUME:
case VIR_DOMAIN_DISK_TYPE_LAST:
break;
} else if (!S_ISBLK(st.st_mode) && st.st_size && !reuse) {
virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
_("external snapshot file for disk %s already "
"exists and is not a block device: %s"),
snapdisk->name, snapdisk->file);
goto cleanup;
}
return 0;
ret = 0;
cleanup:
virStorageFileFree(snapfile);
return ret;
}