static void
virDomainSnapshotDiskDefFormat(virBufferPtr buf,
virDomainSnapshotDiskDefPtr disk)
{
int type = disk->src->type;
if (!disk->name)
return;
virBufferEscapeString(buf, "<disk name='%s'", disk->name);
if (disk->snapshot > 0)
virBufferAsprintf(buf, " snapshot='%s'",
virDomainSnapshotLocationTypeToString(disk->snapshot));
if (!disk->src->path && disk->src->format == 0) {
virBufferAddLit(buf, "/>\n");
return;
}
virBufferAsprintf(buf, " type='%s'>\n", virStorageTypeToString(type));
virBufferAdjustIndent(buf, 2);
if (disk->src->format > 0)
virBufferEscapeString(buf, "<driver type='%s'/>\n",
virStorageFileFormatTypeToString(disk->src->format));
virDomainDiskSourceFormat(buf, disk->src, 0, 0);
virBufferAdjustIndent(buf, -2);
virBufferAddLit(buf, "</disk>\n");
}
virStorageFileBackendPtr
virStorageFileBackendForTypeInternal(int type,
int protocol,
bool report)
{
size_t i;
for (i = 0; i < virStorageFileBackendsCount; i++) {
if (virStorageFileBackends[i]->type == type) {
if (type == VIR_STORAGE_TYPE_NETWORK &&
virStorageFileBackends[i]->protocol != protocol)
continue;
return virStorageFileBackends[i];
}
}
if (!report)
return NULL;
if (type == VIR_STORAGE_TYPE_NETWORK) {
virReportError(VIR_ERR_INTERNAL_ERROR,
_("missing storage backend for network files "
"using %s protocol"),
virStorageNetProtocolTypeToString(protocol));
} else {
virReportError(VIR_ERR_INTERNAL_ERROR,
_("missing storage backend for '%s' storage"),
virStorageTypeToString(type));
}
return NULL;
}
int
qemuTeardownImageCgroup(virDomainObjPtr vm,
virStorageSourcePtr src)
{
qemuDomainObjPrivatePtr priv = vm->privateData;
int perms = VIR_CGROUP_DEVICE_READ |
VIR_CGROUP_DEVICE_WRITE |
VIR_CGROUP_DEVICE_MKNOD;
int ret;
if (!virCgroupHasController(priv->cgroup,
VIR_CGROUP_CONTROLLER_DEVICES))
return 0;
if (!src->path || !virStorageSourceIsLocalStorage(src)) {
VIR_DEBUG("Not updating cgroups for disk path '%s', type: %s",
NULLSTR(src->path), virStorageTypeToString(src->type));
return 0;
}
VIR_DEBUG("Deny path %s", src->path);
ret = virCgroupDenyDevicePath(priv->cgroup, src->path, perms, true);
virDomainAuditCgroupPath(vm, priv->cgroup, "deny", src->path,
virCgroupGetDevicePermsString(perms), ret == 0);
return ret;
}
int
qemuTeardownImageCgroup(virDomainObjPtr vm,
virStorageSourcePtr src)
{
qemuDomainObjPrivatePtr priv = vm->privateData;
int perms = VIR_CGROUP_DEVICE_RWM;
size_t i;
int ret;
if (!virCgroupHasController(priv->cgroup,
VIR_CGROUP_CONTROLLER_DEVICES))
return 0;
if (!src->path || !virStorageSourceIsLocalStorage(src)) {
VIR_DEBUG("Not updating cgroups for disk path '%s', type: %s",
NULLSTR(src->path), virStorageTypeToString(src->type));
return 0;
}
if (virFileExists(DEVICE_MAPPER_CONTROL_PATH)) {
for (i = 0; i < vm->def->ndisks; i++) {
virStorageSourcePtr diskSrc = vm->def->disks[i]->src;
if (src == diskSrc)
continue;
if (virStoragePRDefIsManaged(diskSrc->pr))
break;
}
if (i == vm->def->ndisks) {
VIR_DEBUG("Disabling device mapper control");
ret = virCgroupDenyDevicePath(priv->cgroup,
DEVICE_MAPPER_CONTROL_PATH, perms, true);
virDomainAuditCgroupPath(vm, priv->cgroup, "deny",
DEVICE_MAPPER_CONTROL_PATH,
virCgroupGetDevicePermsString(perms), ret);
if (ret < 0)
return ret;
}
}
VIR_DEBUG("Deny path %s", src->path);
ret = virCgroupDenyDevicePath(priv->cgroup, src->path, perms, true);
virDomainAuditCgroupPath(vm, priv->cgroup, "deny", src->path,
virCgroupGetDevicePermsString(perms), ret);
/* If you're looking for a counter part to
* qemuSetupImagePathCgroup you're at the right place.
* However, we can't just blindly deny all the device mapper
* targets of src->path because they might still be used by
* another disk in domain. Just like we are not removing
* disks from namespace. */
return ret;
}
int
virStorageFileBackendRegister(virStorageFileBackendPtr backend)
{
VIR_DEBUG("Registering storage file backend '%s' protocol '%s'",
virStorageTypeToString(backend->type),
virStorageNetProtocolTypeToString(backend->protocol));
if (virStorageFileBackendsCount >= VIR_STORAGE_BACKENDS_MAX) {
virReportError(VIR_ERR_INTERNAL_ERROR,
_("Too many drivers, cannot register storage file "
"backend '%s'"),
virStorageTypeToString(backend->type));
return -1;
}
virStorageFileBackends[virStorageFileBackendsCount] = backend;
virStorageFileBackendsCount++;
return 0;
}
static int
qemuSetImageCgroupInternal(virDomainObjPtr vm,
virStorageSourcePtr src,
bool deny,
bool forceReadonly)
{
qemuDomainObjPrivatePtr priv = vm->privateData;
int perms = VIR_CGROUP_DEVICE_READ;
int ret;
if (!virCgroupHasController(priv->cgroup,
VIR_CGROUP_CONTROLLER_DEVICES))
return 0;
if (!src->path || !virStorageSourceIsLocalStorage(src)) {
VIR_DEBUG("Not updating cgroups for disk path '%s', type: %s",
NULLSTR(src->path), virStorageTypeToString(src->type));
return 0;
}
if (deny) {
perms |= VIR_CGROUP_DEVICE_WRITE | VIR_CGROUP_DEVICE_MKNOD;
VIR_DEBUG("Deny path %s", src->path);
ret = virCgroupDenyDevicePath(priv->cgroup, src->path, perms);
} else {
if (!src->readonly && !forceReadonly)
perms |= VIR_CGROUP_DEVICE_WRITE;
VIR_DEBUG("Allow path %s, perms: %s",
src->path, virCgroupGetDevicePermsString(perms));
ret = virCgroupAllowDevicePath(priv->cgroup, src->path, perms);
}
virDomainAuditCgroupPath(vm, priv->cgroup,
deny ? "deny" : "allow",
src->path,
virCgroupGetDevicePermsString(perms),
ret == 0);
/* Get this for root squash NFS */
if (ret < 0 &&
virLastErrorIsSystemErrno(EACCES)) {
VIR_DEBUG("Ignoring EACCES for %s", src->path);
virResetLastError();
ret = 0;
}
return ret;
}
static int
qemuSetupImageCgroupInternal(virDomainObjPtr vm,
virStorageSourcePtr src,
bool forceReadonly)
{
if (!src->path || !virStorageSourceIsLocalStorage(src)) {
VIR_DEBUG("Not updating cgroups for disk path '%s', type: %s",
NULLSTR(src->path), virStorageTypeToString(src->type));
return 0;
}
return qemuSetupImagePathCgroup(vm, src->path, src->readonly || forceReadonly);
}
static int
qemuSetupImageCgroupInternal(virDomainObjPtr vm,
virStorageSourcePtr src,
bool forceReadonly)
{
if (!src->path || !virStorageSourceIsLocalStorage(src)) {
VIR_DEBUG("Not updating cgroups for disk path '%s', type: %s",
NULLSTR(src->path), virStorageTypeToString(src->type));
return 0;
}
if (virStoragePRDefIsManaged(src->pr) &&
virFileExists(DEVICE_MAPPER_CONTROL_PATH) &&
qemuSetupImagePathCgroup(vm, DEVICE_MAPPER_CONTROL_PATH, false) < 0)
return -1;
return qemuSetupImagePathCgroup(vm, src->path, src->readonly || forceReadonly);
}
int
virStorageFileBackendForType(int type,
int protocol,
bool required,
virStorageFileBackendPtr *backend)
{
size_t i;
*backend = NULL;
if (virStorageFileBackendInitialize() < 0)
return -1;
for (i = 0; i < virStorageFileBackendsCount; i++) {
if (virStorageFileBackends[i]->type == type) {
if (type == VIR_STORAGE_TYPE_NETWORK &&
virStorageFileBackends[i]->protocol != protocol)
continue;
*backend = virStorageFileBackends[i];
return 0;
}
}
if (!required)
return 0;
if (type == VIR_STORAGE_TYPE_NETWORK) {
virReportError(VIR_ERR_INTERNAL_ERROR,
_("missing storage backend for network files "
"using %s protocol"),
virStorageNetProtocolTypeToString(protocol));
} else {
virReportError(VIR_ERR_INTERNAL_ERROR,
_("missing storage backend for '%s' storage"),
virStorageTypeToString(type));
}
return -1;
}
/* Align def->disks to def->domain. Sort the list of def->disks,
* filling in any missing disks or snapshot state defaults given by
* the domain, with a fallback to a passed in default. Convert paths
* to disk targets for uniformity. Issue an error and return -1 if
* any def->disks[n]->name appears more than once or does not map to
* dom->disks. If require_match, also ensure that there is no
* conflicting requests for both internal and external snapshots. */
int
virDomainSnapshotAlignDisks(virDomainSnapshotDefPtr def,
int default_snapshot,
bool require_match)
{
int ret = -1;
virBitmapPtr map = NULL;
size_t i;
int ndisks;
if (!def->dom) {
virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
_("missing domain in snapshot"));
goto cleanup;
}
if (def->ndisks > def->dom->ndisks) {
virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
_("too many disk snapshot requests for domain"));
goto cleanup;
}
/* Unlikely to have a guest without disks but technically possible. */
if (!def->dom->ndisks) {
ret = 0;
goto cleanup;
}
if (!(map = virBitmapNew(def->dom->ndisks)))
goto cleanup;
/* Double check requested disks. */
for (i = 0; i < def->ndisks; i++) {
virDomainSnapshotDiskDefPtr disk = &def->disks[i];
int idx = virDomainDiskIndexByName(def->dom, disk->name, false);
int disk_snapshot;
if (idx < 0) {
virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
_("no disk named '%s'"), disk->name);
goto cleanup;
}
if (virBitmapIsBitSet(map, idx)) {
virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
_("disk '%s' specified twice"),
disk->name);
goto cleanup;
}
ignore_value(virBitmapSetBit(map, idx));
disk->index = idx;
disk_snapshot = def->dom->disks[idx]->snapshot;
if (!disk->snapshot) {
if (disk_snapshot &&
(!require_match ||
disk_snapshot == VIR_DOMAIN_SNAPSHOT_LOCATION_NONE))
disk->snapshot = disk_snapshot;
else
disk->snapshot = default_snapshot;
} else if (require_match &&
disk->snapshot != default_snapshot &&
!(disk->snapshot == VIR_DOMAIN_SNAPSHOT_LOCATION_NONE &&
disk_snapshot == VIR_DOMAIN_SNAPSHOT_LOCATION_NONE)) {
const char *tmp;
tmp = virDomainSnapshotLocationTypeToString(default_snapshot);
virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
_("disk '%s' must use snapshot mode '%s'"),
disk->name, tmp);
goto cleanup;
}
if (disk->src->path &&
disk->snapshot != VIR_DOMAIN_SNAPSHOT_LOCATION_EXTERNAL) {
virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
_("file '%s' for disk '%s' requires "
"use of external snapshot mode"),
disk->src->path, disk->name);
goto cleanup;
}
if (STRNEQ(disk->name, def->dom->disks[idx]->dst)) {
VIR_FREE(disk->name);
if (VIR_STRDUP(disk->name, def->dom->disks[idx]->dst) < 0)
goto cleanup;
}
}
/* Provide defaults for all remaining disks. */
ndisks = def->ndisks;
if (VIR_EXPAND_N(def->disks, def->ndisks,
def->dom->ndisks - def->ndisks) < 0)
goto cleanup;
for (i = 0; i < def->dom->ndisks; i++) {
virDomainSnapshotDiskDefPtr disk;
if (virBitmapIsBitSet(map, i))
continue;
disk = &def->disks[ndisks++];
if (VIR_ALLOC(disk->src) < 0)
goto cleanup;
if (VIR_STRDUP(disk->name, def->dom->disks[i]->dst) < 0)
goto cleanup;
disk->index = i;
/* Don't snapshot empty drives */
if (virStorageSourceIsEmpty(def->dom->disks[i]->src))
disk->snapshot = VIR_DOMAIN_SNAPSHOT_LOCATION_NONE;
else
disk->snapshot = def->dom->disks[i]->snapshot;
disk->src->type = VIR_STORAGE_TYPE_FILE;
if (!disk->snapshot)
disk->snapshot = default_snapshot;
}
qsort(&def->disks[0], def->ndisks, sizeof(def->disks[0]), disksorter);
/* Generate any default external file names, but only if the
* backing file is a regular file. */
for (i = 0; i < def->ndisks; i++) {
virDomainSnapshotDiskDefPtr disk = &def->disks[i];
if (disk->snapshot == VIR_DOMAIN_SNAPSHOT_LOCATION_EXTERNAL &&
!disk->src->path) {
const char *original = virDomainDiskGetSource(def->dom->disks[i]);
const char *tmp;
struct stat sb;
if (disk->src->type != VIR_STORAGE_TYPE_FILE) {
virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
_("cannot generate external snapshot name "
"for disk '%s' on a '%s' device"),
disk->name,
virStorageTypeToString(disk->src->type));
goto cleanup;
}
if (!original) {
virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
_("cannot generate external snapshot name "
"for disk '%s' without source"),
disk->name);
goto cleanup;
}
if (stat(original, &sb) < 0 || !S_ISREG(sb.st_mode)) {
virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
_("source for disk '%s' is not a regular "
"file; refusing to generate external "
"snapshot name"),
disk->name);
goto cleanup;
}
tmp = strrchr(original, '.');
if (!tmp || strchr(tmp, '/')) {
if (virAsprintf(&disk->src->path, "%s.%s", original,
def->name) < 0)
goto cleanup;
} else {
if ((tmp - original) > INT_MAX) {
virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
_("integer overflow"));
goto cleanup;
}
if (virAsprintf(&disk->src->path, "%.*s.%s",
(int) (tmp - original), original,
def->name) < 0)
goto cleanup;
}
}
}
ret = 0;
cleanup:
virBitmapFree(map);
return ret;
}
static int
xenFormatXMDisk(virConfValuePtr list,
virDomainDiskDefPtr disk)
{
virBuffer buf = VIR_BUFFER_INITIALIZER;
virConfValuePtr val, tmp;
const char *src = virDomainDiskGetSource(disk);
int format = virDomainDiskGetFormat(disk);
const char *driver = virDomainDiskGetDriver(disk);
if (src) {
if (format) {
const char *type;
if (format == VIR_STORAGE_FILE_RAW)
type = "aio";
else
type = virStorageFileFormatTypeToString(format);
virBufferAsprintf(&buf, "%s:", driver);
if (STREQ(driver, "tap"))
virBufferAsprintf(&buf, "%s:", type);
} else {
switch (virDomainDiskGetType(disk)) {
case VIR_STORAGE_TYPE_FILE:
virBufferAddLit(&buf, "file:");
break;
case VIR_STORAGE_TYPE_BLOCK:
virBufferAddLit(&buf, "phy:");
break;
default:
virReportError(VIR_ERR_INTERNAL_ERROR,
_("unsupported disk type %s"),
virStorageTypeToString(virDomainDiskGetType(disk)));
goto cleanup;
}
}
virBufferAdd(&buf, src, -1);
}
virBufferAddLit(&buf, ",");
virBufferAdd(&buf, disk->dst, -1);
if (disk->device == VIR_DOMAIN_DISK_DEVICE_CDROM)
virBufferAddLit(&buf, ":cdrom");
if (disk->src->readonly)
virBufferAddLit(&buf, ",r");
else if (disk->src->shared)
virBufferAddLit(&buf, ",!");
else
virBufferAddLit(&buf, ",w");
if (disk->transient) {
virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
_("transient disks not supported yet"));
return -1;
}
if (virBufferCheckError(&buf) < 0)
goto cleanup;
if (VIR_ALLOC(val) < 0)
goto cleanup;
val->type = VIR_CONF_STRING;
val->str = virBufferContentAndReset(&buf);
tmp = list->list;
while (tmp && tmp->next)
tmp = tmp->next;
if (tmp)
tmp->next = val;
else
list->list = val;
return 0;
cleanup:
virBufferFreeAndReset(&buf);
return -1;
}
