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libvirt/src/qemu/qemu_block.c
Peter Krempa 6431b20c3e virJSONValueArrayAppend: Clear pointer when taking ownership of passed value 
The parent array takes ownership of the inserted value once all checks
pass. Don't make the callers second-guess when that happens and modify
the function to take a double pointer so that it can be cleared once the
ownership is taken.

Signed-off-by: Peter Krempa <pkrempa@redhat.com>
Reviewed-by: Michal Privoznik <mprivozn@redhat.com>
2021-02-20 13:26:37 +01:00

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/*
* qemu_block.c: helper functions for QEMU block subsystem
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library. If not, see
* <http://www.gnu.org/licenses/>.
*/
#include <config.h>
#include "qemu_block.h"
#include "qemu_command.h"
#include "qemu_domain.h"
#include "qemu_alias.h"
#include "qemu_security.h"
#include "storage_source.h"
#include "viralloc.h"
#include "virstoragefile.h"
#include "virstring.h"
#include "virlog.h"
#define VIR_FROM_THIS VIR_FROM_QEMU
VIR_LOG_INIT("qemu.qemu_block");
/* qemu declares the buffer for node names as a 32 byte array */
static const size_t qemuBlockNodeNameBufSize = 32;
static int
qemuBlockNodeNameValidate(const char *nn)
{
if (!nn)
return 0;
if (strlen(nn) >= qemuBlockNodeNameBufSize) {
virReportError(VIR_ERR_INTERNAL_ERROR,
_("node-name '%s' too long for qemu"), nn);
return -1;
}
return 0;
}
static int
qemuBlockNamedNodesArrayToHash(size_t pos G_GNUC_UNUSED,
virJSONValuePtr item,
void *opaque)
{
GHashTable *table = opaque;
const char *name;
if (!(name = virJSONValueObjectGetString(item, "node-name")))
return 1;
if (virHashAddEntry(table, name, item) < 0)
return -1;
return 0;
}
static void
qemuBlockNodeNameBackingChainDataFree(qemuBlockNodeNameBackingChainDataPtr data)
{
if (!data)
return;
g_free(data->nodeformat);
g_free(data->nodestorage);
g_free(data->qemufilename);
g_free(data->drvformat);
g_free(data->drvstorage);
qemuBlockNodeNameBackingChainDataFree(data->backing);
g_free(data);
}
G_DEFINE_AUTOPTR_CLEANUP_FUNC(qemuBlockNodeNameBackingChainData,
qemuBlockNodeNameBackingChainDataFree);
static void
qemuBlockNodeNameBackingChainDataHashEntryFree(void *opaque)
{
qemuBlockNodeNameBackingChainDataFree(opaque);
}
/* list of driver names of layers that qemu automatically adds into the
* backing chain */
static const char *qemuBlockDriversBlockjob[] = {
"mirror_top", "commit_top", NULL };
static bool
qemuBlockDriverMatch(const char *drvname,
const char **drivers)
{
while (*drivers) {
if (STREQ(drvname, *drivers))
return true;
drivers++;
}
return false;
}
struct qemuBlockNodeNameGetBackingChainData {
GHashTable *nodenamestable;
GHashTable *disks;
};
static int
qemuBlockNodeNameGetBackingChainBacking(virJSONValuePtr next,
GHashTable *nodenamestable,
qemuBlockNodeNameBackingChainDataPtr *nodenamedata)
{
g_autoptr(qemuBlockNodeNameBackingChainData) data = NULL;
qemuBlockNodeNameBackingChainDataPtr backingdata = NULL;
virJSONValuePtr backing = virJSONValueObjectGetObject(next, "backing");
virJSONValuePtr parent = virJSONValueObjectGetObject(next, "parent");
virJSONValuePtr parentnodedata;
virJSONValuePtr nodedata;
const char *nodename = virJSONValueObjectGetString(next, "node-name");
const char *drvname = NULL;
const char *drvparent = NULL;
const char *parentnodename = NULL;
const char *filename = NULL;
if (!nodename)
return 0;
if ((nodedata = virHashLookup(nodenamestable, nodename)) &&
(drvname = virJSONValueObjectGetString(nodedata, "drv"))) {
/* qemu 2.9 reports layers in the backing chain which don't correspond
* to files. skip them */
if (qemuBlockDriverMatch(drvname, qemuBlockDriversBlockjob)) {
if (backing) {
return qemuBlockNodeNameGetBackingChainBacking(backing,
nodenamestable,
nodenamedata);
} else {
return 0;
}
}
}
if (parent &&
(parentnodename = virJSONValueObjectGetString(parent, "node-name"))) {
if ((parentnodedata = virHashLookup(nodenamestable, parentnodename))) {
filename = virJSONValueObjectGetString(parentnodedata, "file");
drvparent = virJSONValueObjectGetString(parentnodedata, "drv");
}
}
data = g_new0(qemuBlockNodeNameBackingChainData, 1);
data->nodeformat = g_strdup(nodename);
data->nodestorage = g_strdup(parentnodename);
data->qemufilename = g_strdup(filename);
data->drvformat = g_strdup(drvname);
data->drvstorage = g_strdup(drvparent);
if (backing &&
qemuBlockNodeNameGetBackingChainBacking(backing, nodenamestable,
&backingdata) < 0)
return -1;
data->backing = g_steal_pointer(&backingdata);
*nodenamedata = g_steal_pointer(&data);
return 0;
}
static int
qemuBlockNodeNameGetBackingChainDisk(size_t pos G_GNUC_UNUSED,
virJSONValuePtr item,
void *opaque)
{
struct qemuBlockNodeNameGetBackingChainData *data = opaque;
const char *device = virJSONValueObjectGetString(item, "device");
g_autoptr(qemuBlockNodeNameBackingChainData) devicedata = NULL;
if (qemuBlockNodeNameGetBackingChainBacking(item, data->nodenamestable,
&devicedata) < 0)
return -1;
if (devicedata &&
virHashAddEntry(data->disks, device, devicedata) < 0)
return -1;
devicedata = NULL;
return 1; /* we don't really want to steal @item */
}
/**
* qemuBlockNodeNameGetBackingChain:
* @namednodes: JSON array of data returned from 'query-named-block-nodes'
* @blockstats: JSON array of data returned from 'query-blockstats'
*
* Tries to reconstruct the backing chain from @json to allow detection of
* node names that were auto-assigned by qemu. This is a best-effort operation
* and may not be successful. The returned hash table contains the entries as
* qemuBlockNodeNameBackingChainDataPtr accessible by the node name. The fields
* then can be used to recover the full backing chain.
*
* Returns a hash table on success and NULL on failure.
*/
GHashTable *
qemuBlockNodeNameGetBackingChain(virJSONValuePtr namednodes,
virJSONValuePtr blockstats)
{
struct qemuBlockNodeNameGetBackingChainData data;
g_autoptr(GHashTable) namednodestable = NULL;
g_autoptr(GHashTable) disks = NULL;
memset(&data, 0, sizeof(data));
if (!(namednodestable = virHashNew(virJSONValueHashFree)))
return NULL;
if (virJSONValueArrayForeachSteal(namednodes,
qemuBlockNamedNodesArrayToHash,
namednodestable) < 0)
return NULL;
if (!(disks = virHashNew(qemuBlockNodeNameBackingChainDataHashEntryFree)))
return NULL;
data.nodenamestable = namednodestable;
data.disks = disks;
if (virJSONValueArrayForeachSteal(blockstats,
qemuBlockNodeNameGetBackingChainDisk,
&data) < 0)
return NULL;
return g_steal_pointer(&disks);
}
static void
qemuBlockDiskClearDetectedNodes(virDomainDiskDefPtr disk)
{
virStorageSourcePtr next = disk->src;
while (virStorageSourceIsBacking(next)) {
VIR_FREE(next->nodeformat);
VIR_FREE(next->nodestorage);
next = next->backingStore;
}
}
static int
qemuBlockDiskDetectNodes(virDomainDiskDefPtr disk,
GHashTable *disktable)
{
qemuBlockNodeNameBackingChainDataPtr entry = NULL;
virStorageSourcePtr src = disk->src;
g_autofree char *alias = NULL;
/* don't attempt the detection if the top level already has node names */
if (src->nodeformat || src->nodestorage)
return 0;
if (!(alias = qemuAliasDiskDriveFromDisk(disk)))
return -1;
if (!(entry = virHashLookup(disktable, alias)))
return 0;
while (virStorageSourceIsBacking(src) && entry) {
if (src->nodeformat || src->nodestorage) {
if (STRNEQ_NULLABLE(src->nodeformat, entry->nodeformat) ||
STRNEQ_NULLABLE(src->nodestorage, entry->nodestorage))
goto error;
break;
} else {
src->nodeformat = g_strdup(entry->nodeformat);
src->nodestorage = g_strdup(entry->nodestorage);
}
entry = entry->backing;
src = src->backingStore;
}
return 0;
error:
qemuBlockDiskClearDetectedNodes(disk);
return -1;
}
int
qemuBlockNodeNamesDetect(virQEMUDriverPtr driver,
virDomainObjPtr vm,
qemuDomainAsyncJob asyncJob)
{
qemuDomainObjPrivatePtr priv = vm->privateData;
g_autoptr(GHashTable) disktable = NULL;
g_autoptr(virJSONValue) data = NULL;
g_autoptr(virJSONValue) blockstats = NULL;
virDomainDiskDefPtr disk;
size_t i;
if (!virQEMUCapsGet(priv->qemuCaps, QEMU_CAPS_QUERY_NAMED_BLOCK_NODES))
return 0;
if (qemuDomainObjEnterMonitorAsync(driver, vm, asyncJob) < 0)
return -1;
data = qemuMonitorQueryNamedBlockNodes(qemuDomainGetMonitor(vm));
blockstats = qemuMonitorQueryBlockstats(qemuDomainGetMonitor(vm));
if (qemuDomainObjExitMonitor(driver, vm) < 0 || !data || !blockstats)
return -1;
if (!(disktable = qemuBlockNodeNameGetBackingChain(data, blockstats)))
return -1;
for (i = 0; i < vm->def->ndisks; i++) {
disk = vm->def->disks[i];
if (qemuBlockDiskDetectNodes(disk, disktable) < 0)
return -1;
}
return 0;
}
/**
* qemuBlockGetNodeData:
* @data: JSON object returned from query-named-block-nodes
*
* Returns a hash table organized by the node name of the JSON value objects of
* data for given qemu block nodes.
*
* Returns a filled GHashTable *on success NULL on error.
*/
GHashTable *
qemuBlockGetNodeData(virJSONValuePtr data)
{
g_autoptr(GHashTable) nodedata = NULL;
if (!(nodedata = virHashNew(virJSONValueHashFree)))
return NULL;
if (virJSONValueArrayForeachSteal(data,
qemuBlockNamedNodesArrayToHash, nodedata) < 0)
return NULL;
return g_steal_pointer(&nodedata);
}
/**
* qemuBlockStorageSourceSupportsConcurrentAccess:
* @src: disk storage source
*
* Returns true if the given storage format supports concurrent access from two
* separate processes.
*/
bool
qemuBlockStorageSourceSupportsConcurrentAccess(virStorageSourcePtr src)
{
/* no need to check in backing chain since only RAW storage supports this */
return src->format == VIR_STORAGE_FILE_RAW;
}
/**
* qemuBlockStorageSourceGetURI:
* @src: disk storage source
*
* Formats a URI from a virStorageSource.
*/
virURIPtr
qemuBlockStorageSourceGetURI(virStorageSourcePtr src)
{
g_autoptr(virURI) uri = NULL;
if (src->nhosts != 1) {
virReportError(VIR_ERR_INTERNAL_ERROR,
_("protocol '%s' accepts only one host"),
virStorageNetProtocolTypeToString(src->protocol));
return NULL;
}
uri = g_new0(virURI, 1);
if (src->hosts->transport == VIR_STORAGE_NET_HOST_TRANS_TCP) {
uri->port = src->hosts->port;
uri->scheme = g_strdup(virStorageNetProtocolTypeToString(src->protocol));
} else {
uri->scheme = g_strdup_printf("%s+%s",
virStorageNetProtocolTypeToString(src->protocol),
virStorageNetHostTransportTypeToString(src->hosts->transport));
}
if (src->path) {
if (src->volume) {
uri->path = g_strdup_printf("/%s/%s", src->volume, src->path);
} else {
uri->path = g_strdup_printf("%s%s", src->path[0] == '/' ? "" : "/",
src->path);
}
}
uri->query = g_strdup(src->query);
uri->server = g_strdup(src->hosts->name);
return g_steal_pointer(&uri);
}
/**
* qemuBlockStorageSourceBuildJSONSocketAddress
* @host: the virStorageNetHostDefPtr definition to build
* @legacy: use old field names/values
*
* Formats @hosts into a json object conforming to the 'SocketAddress' type
* in qemu.
*
* For compatibility with old approach used in the gluster driver of old qemus
* use the old spelling for TCP transport and, the path field of the unix socket.
*
* Returns a virJSONValuePtr for a single server.
*/
static virJSONValuePtr
qemuBlockStorageSourceBuildJSONSocketAddress(virStorageNetHostDefPtr host,
bool legacy)
{
g_autoptr(virJSONValue) server = NULL;
const char *transport;
const char *field;
g_autofree char *port = NULL;
switch ((virStorageNetHostTransport) host->transport) {
case VIR_STORAGE_NET_HOST_TRANS_TCP:
if (legacy)
transport = "tcp";
else
transport = "inet";
port = g_strdup_printf("%u", host->port);
if (virJSONValueObjectCreate(&server,
"s:type", transport,
"s:host", host->name,
"s:port", port,
NULL) < 0)
return NULL;
break;
case VIR_STORAGE_NET_HOST_TRANS_UNIX:
if (legacy)
field = "s:socket";
else
field = "s:path";
if (virJSONValueObjectCreate(&server,
"s:type", "unix",
field, host->socket,
NULL) < 0)
return NULL;
break;
case VIR_STORAGE_NET_HOST_TRANS_RDMA:
case VIR_STORAGE_NET_HOST_TRANS_LAST:
virReportError(VIR_ERR_INTERNAL_ERROR,
_("transport protocol '%s' is not yet supported"),
virStorageNetHostTransportTypeToString(host->transport));
return NULL;
}
return g_steal_pointer(&server);
}
/**
* qemuBlockStorageSourceBuildHostsJSONSocketAddress:
* @src: disk storage source
* @legacy: use 'tcp' instead of 'inet' for compatibility reasons
*
* Formats src->hosts into a json object conforming to the 'SocketAddress' type
* in qemu.
*/
static virJSONValuePtr
qemuBlockStorageSourceBuildHostsJSONSocketAddress(virStorageSourcePtr src,
bool legacy)
{
g_autoptr(virJSONValue) servers = NULL;
g_autoptr(virJSONValue) server = NULL;
virStorageNetHostDefPtr host;
size_t i;
servers = virJSONValueNewArray();
for (i = 0; i < src->nhosts; i++) {
host = src->hosts + i;
if (!(server = qemuBlockStorageSourceBuildJSONSocketAddress(host, legacy)))
return NULL;
if (virJSONValueArrayAppend(servers, &server) < 0)
return NULL;
}
return g_steal_pointer(&servers);
}
/**
* qemuBlockStorageSourceBuildJSONInetSocketAddress
* @host: the virStorageNetHostDefPtr definition to build
*
* Formats @hosts into a json object conforming to the 'InetSocketAddress' type
* in qemu.
*
* Returns a virJSONValuePtr for a single server.
*/
static virJSONValuePtr
qemuBlockStorageSourceBuildJSONInetSocketAddress(virStorageNetHostDefPtr host)
{
virJSONValuePtr ret = NULL;
g_autofree char *port = NULL;
if (host->transport != VIR_STORAGE_NET_HOST_TRANS_TCP) {
virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
_("only TCP protocol can be converted to InetSocketAddress"));
return NULL;
}
port = g_strdup_printf("%u", host->port);
ignore_value(virJSONValueObjectCreate(&ret,
"s:host", host->name,
"s:port", port,
NULL));
return ret;
}
/**
* qemuBlockStorageSourceBuildJSONNFSServer(virStorageNetHostDefPtr host)
* @host: the virStorageNetHostDefPtr definition to build
*
* Formats @hosts into a json object conforming to the 'NFSServer' type
* in qemu.
*
* Returns a virJSONValuePtr for a single server.
*/
static virJSONValuePtr
qemuBlockStorageSourceBuildJSONNFSServer(virStorageNetHostDefPtr host)
{
virJSONValuePtr ret = NULL;
ignore_value(virJSONValueObjectCreate(&ret,
"s:host", host->name,
"s:type", "inet",
NULL));
return ret;
}
/**
* qemuBlockStorageSourceBuildHostsJSONInetSocketAddress:
* @src: disk storage source
*
* Formats src->hosts into a json object conforming to the 'InetSocketAddress'
* type in qemu.
*/
static virJSONValuePtr
qemuBlockStorageSourceBuildHostsJSONInetSocketAddress(virStorageSourcePtr src)
{
g_autoptr(virJSONValue) servers = NULL;
g_autoptr(virJSONValue) server = NULL;
virStorageNetHostDefPtr host;
size_t i;
servers = virJSONValueNewArray();
for (i = 0; i < src->nhosts; i++) {
host = src->hosts + i;
if (!(server = qemuBlockStorageSourceBuildJSONInetSocketAddress(host)))
return NULL;
if (virJSONValueArrayAppend(servers, &server) < 0)
return NULL;
}
return g_steal_pointer(&servers);
}
static virJSONValuePtr
qemuBlockStorageSourceGetGlusterProps(virStorageSourcePtr src,
bool legacy,
bool onlytarget)
{
g_autoptr(virJSONValue) servers = NULL;
g_autoptr(virJSONValue) props = NULL;
if (!(servers = qemuBlockStorageSourceBuildHostsJSONSocketAddress(src, legacy)))
return NULL;
/* { driver:"gluster",
* volume:"testvol",
* path:"/a.img",
* server :[{type:"tcp", host:"1.2.3.4", port:24007},
* {type:"unix", socket:"/tmp/glusterd.socket"}, ...]}
*/
if (virJSONValueObjectCreate(&props,
"s:volume", src->volume,
"s:path", src->path,
"a:server", &servers, NULL) < 0)
return NULL;
if (!onlytarget &&
src->debug &&
virJSONValueObjectAdd(props, "u:debug", src->debugLevel, NULL) < 0)
return NULL;
return g_steal_pointer(&props);
}
static virJSONValuePtr
qemuBlockStorageSourceGetVxHSProps(virStorageSourcePtr src,
bool onlytarget)
{
g_autoptr(virJSONValue) server = NULL;
const char *tlsAlias = src->tlsAlias;
virJSONValuePtr ret = NULL;
if (src->nhosts != 1) {
virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
_("VxHS protocol accepts only one host"));
return NULL;
}
if (!(server = qemuBlockStorageSourceBuildJSONInetSocketAddress(&src->hosts[0])))
return NULL;
if (onlytarget)
tlsAlias = NULL;
/* VxHS disk specification example:
* { driver:"vxhs",
* tls-creds:"objvirtio-disk0_tls0",
* vdisk-id:"eb90327c-8302-4725-4e85ed4dc251",
* server:{type:"tcp", host:"1.2.3.4", port:9999}}
*/
ignore_value(virJSONValueObjectCreate(&ret,
"S:tls-creds", tlsAlias,
"s:vdisk-id", src->path,
"a:server", &server, NULL));
return ret;
}
static virJSONValuePtr
qemuBlockStorageSourceGetNFSProps(virStorageSourcePtr src)
{
g_autoptr(virJSONValue) server = NULL;
virJSONValuePtr ret = NULL;
if (!(server = qemuBlockStorageSourceBuildJSONNFSServer(&src->hosts[0])))
return NULL;
/* NFS disk specification example:
* { driver:"nfs",
* user: "0",
* group: "0",
* path: "/foo/bar/baz",
* server: {type:"tcp", host:"1.2.3.4"}}
*/
if (virJSONValueObjectCreate(&ret,
"a:server", &server,
"S:path", src->path, NULL) < 0)
return NULL;
if (src->nfs_uid != -1 &&
virJSONValueObjectAdd(ret, "i:user", src->nfs_uid, NULL) < 0)
return NULL;
if (src->nfs_gid != -1 &&
virJSONValueObjectAdd(ret, "i:group", src->nfs_gid, NULL) < 0)
return NULL;
return ret;
}
static virJSONValuePtr
qemuBlockStorageSourceGetCURLProps(virStorageSourcePtr src,
bool onlytarget)
{
qemuDomainStorageSourcePrivatePtr srcPriv = QEMU_DOMAIN_STORAGE_SOURCE_PRIVATE(src);
const char *passwordalias = NULL;
const char *cookiealias = NULL;
const char *username = NULL;
virJSONValuePtr ret = NULL;
g_autoptr(virURI) uri = NULL;
g_autofree char *uristr = NULL;
g_autofree char *cookiestr = NULL;
/**
* Common options:
* url, readahead, timeout, username, password-secret, proxy-username,
* proxy-password-secret
*
* Options for http transport:
* cookie, cookie-secret
*
* Options for secure transport (ftps, https):
* sslverify
*/
if (!(uri = qemuBlockStorageSourceGetURI(src)))
return NULL;
if (!(uristr = virURIFormat(uri)))
return NULL;
if (!onlytarget) {
if (src->auth) {
username = src->auth->username;
passwordalias = srcPriv->secinfo->s.aes.alias;
}
if (srcPriv &&
srcPriv->httpcookie)
cookiealias = srcPriv->httpcookie->s.aes.alias;
} else {
/* format target string along with cookies */
cookiestr = qemuBlockStorageSourceGetCookieString(src);
}
ignore_value(virJSONValueObjectCreate(&ret,
"s:url", uristr,
"S:username", username,
"S:password-secret", passwordalias,
"T:sslverify", src->sslverify,
"S:cookie", cookiestr,
"S:cookie-secret", cookiealias,
"P:timeout", src->timeout,
"P:readahead", src->readahead,
NULL));
return ret;
}
static virJSONValuePtr
qemuBlockStorageSourceGetISCSIProps(virStorageSourcePtr src,
bool onlytarget)
{
qemuDomainStorageSourcePrivatePtr srcPriv = QEMU_DOMAIN_STORAGE_SOURCE_PRIVATE(src);
g_autofree char *target = NULL;
char *lunStr = NULL;
char *username = NULL;
char *objalias = NULL;
g_autofree char *portal = NULL;
unsigned int lun = 0;
virJSONValuePtr ret = NULL;
/* { driver:"iscsi",
* transport:"tcp", ("iser" also possible)
* portal:"example.com",
* target:"iqn.2017-04.com.example:iscsi-disks",
* lun:1,
* user:"username",
* password-secret:"secret-alias",
* initiator-name:"iqn.2017-04.com.example:client"
* }
*/
target = g_strdup(src->path);
/* Separate the target and lun */
if ((lunStr = strchr(target, '/'))) {
*(lunStr++) = '\0';
if (virStrToLong_ui(lunStr, NULL, 10, &lun) < 0) {
virReportError(VIR_ERR_INTERNAL_ERROR,
_("cannot parse target for lunStr '%s'"),
target);
return NULL;
}
}
/* combine host and port into portal */
if (virSocketAddrNumericFamily(src->hosts[0].name) == AF_INET6) {
portal = g_strdup_printf("[%s]:%u", src->hosts[0].name,
src->hosts[0].port);
} else {
portal = g_strdup_printf("%s:%u", src->hosts[0].name, src->hosts[0].port);
}
if (!onlytarget && src->auth) {
username = src->auth->username;
objalias = srcPriv->secinfo->s.aes.alias;
}
ignore_value(virJSONValueObjectCreate(&ret,
"s:portal", portal,
"s:target", target,
"u:lun", lun,
"s:transport", "tcp",
"S:user", username,
"S:password-secret", objalias,
"S:initiator-name", src->initiator.iqn,
NULL));
return ret;
}
static virJSONValuePtr
qemuBlockStorageSourceGetNBDProps(virStorageSourcePtr src,
bool onlytarget)
{
g_autoptr(virJSONValue) serverprops = NULL;
const char *tlsAlias = src->tlsAlias;
virJSONValuePtr ret = NULL;
if (src->nhosts != 1) {
virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
_("nbd protocol accepts only one host"));
return NULL;
}
serverprops = qemuBlockStorageSourceBuildJSONSocketAddress(&src->hosts[0],
false);
if (!serverprops)
return NULL;
if (onlytarget)
tlsAlias = NULL;
if (virJSONValueObjectCreate(&ret,
"a:server", &serverprops,
"S:export", src->path,
"S:tls-creds", tlsAlias,
NULL) < 0)
return NULL;
return ret;
}
static virJSONValuePtr
qemuBlockStorageSourceGetRBDProps(virStorageSourcePtr src,
bool onlytarget)
{
qemuDomainStorageSourcePrivatePtr srcPriv = QEMU_DOMAIN_STORAGE_SOURCE_PRIVATE(src);
g_autoptr(virJSONValue) servers = NULL;
virJSONValuePtr ret = NULL;
const char *username = NULL;
g_autoptr(virJSONValue) authmodes = NULL;
g_autoptr(virJSONValue) mode = NULL;
const char *keysecret = NULL;
if (src->nhosts > 0 &&
!(servers = qemuBlockStorageSourceBuildHostsJSONInetSocketAddress(src)))
return NULL;
if (!onlytarget && src->auth) {
username = srcPriv->secinfo->s.aes.username;
keysecret = srcPriv->secinfo->s.aes.alias;
/* the auth modes are modelled after our old command line generator */
authmodes = virJSONValueNewArray();
if (!(mode = virJSONValueNewString("cephx")) ||
virJSONValueArrayAppend(authmodes, &mode) < 0)
return NULL;
if (!(mode = virJSONValueNewString("none")) ||
virJSONValueArrayAppend(authmodes, &mode) < 0)
return NULL;
}
if (virJSONValueObjectCreate(&ret,
"s:pool", src->volume,
"s:image", src->path,
"S:snapshot", src->snapshot,
"S:conf", src->configFile,
"A:server", &servers,
"S:user", username,
"A:auth-client-required", &authmodes,
"S:key-secret", keysecret,
NULL) < 0)
return NULL;
return ret;
}
static virJSONValuePtr
qemuBlockStorageSourceGetSheepdogProps(virStorageSourcePtr src)
{
g_autoptr(virJSONValue) serverprops = NULL;
virJSONValuePtr ret = NULL;
if (src->nhosts != 1) {
virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
_("sheepdog protocol accepts only one host"));
return NULL;
}
serverprops = qemuBlockStorageSourceBuildJSONSocketAddress(&src->hosts[0],
false);
if (!serverprops)
return NULL;
/* libvirt does not support the 'snap-id' and 'tag' properties */
if (virJSONValueObjectCreate(&ret,
"a:server", &serverprops,
"s:vdi", src->path,
NULL) < 0)
return NULL;
return ret;
}
static virJSONValuePtr
qemuBlockStorageSourceGetSshProps(virStorageSourcePtr src)
{
g_autoptr(virJSONValue) serverprops = NULL;
virJSONValuePtr ret = NULL;
const char *username = NULL;
g_autoptr(virJSONValue) host_key_check = NULL;
if (src->nhosts != 1) {
virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
_("sheepdog protocol accepts only one host"));
return NULL;
}
serverprops = qemuBlockStorageSourceBuildJSONInetSocketAddress(&src->hosts[0]);
if (!serverprops)
return NULL;
if (src->auth)
username = src->auth->username;
else if (src->ssh_user)
username = src->ssh_user;
if (src->ssh_host_key_check_disabled &&
virJSONValueObjectCreate(&host_key_check,
"s:mode", "none",
NULL) < 0)
return NULL;
if (virJSONValueObjectCreate(&ret,
"s:path", src->path,
"a:server", &serverprops,
"S:user", username,
"A:host-key-check", &host_key_check,
NULL) < 0)
return NULL;
return ret;
}
static virJSONValuePtr
qemuBlockStorageSourceGetFileProps(virStorageSourcePtr src,
bool onlytarget)
{
const char *iomode = NULL;
const char *prManagerAlias = NULL;
virJSONValuePtr ret = NULL;
if (!onlytarget) {
if (src->pr)
prManagerAlias = src->pr->mgralias;
if (src->iomode != VIR_DOMAIN_DISK_IO_DEFAULT)
iomode = virDomainDiskIoTypeToString(src->iomode);
}
ignore_value(virJSONValueObjectCreate(&ret,
"s:filename", src->path,
"S:aio", iomode,
"S:pr-manager", prManagerAlias,
NULL) < 0);
return ret;
}
static virJSONValuePtr
qemuBlockStorageSourceGetVvfatProps(virStorageSourcePtr src,
bool onlytarget)
{
g_autoptr(virJSONValue) ret = NULL;
/* libvirt currently does not handle the following attributes:
* '*fat-type': 'int'
* '*label': 'str'
*/
if (virJSONValueObjectCreate(&ret,
"s:driver", "vvfat",
"s:dir", src->path,
"b:floppy", src->floppyimg, NULL) < 0)
return NULL;
if (!onlytarget &&
virJSONValueObjectAdd(ret, "b:rw", !src->readonly, NULL) < 0)
return NULL;
return g_steal_pointer(&ret);
}
static virJSONValuePtr
qemuBlockStorageSourceGetNVMeProps(virStorageSourcePtr src)
{
const virStorageSourceNVMeDef *nvme = src->nvme;
g_autofree char *pciAddr = NULL;
virJSONValuePtr ret = NULL;
if (!(pciAddr = virPCIDeviceAddressAsString(&nvme->pciAddr)))
return NULL;
ignore_value(virJSONValueObjectCreate(&ret,
"s:driver", "nvme",
"s:device", pciAddr,
"U:namespace", nvme->namespc,
NULL));
return ret;
}
static int
qemuBlockStorageSourceGetBlockdevGetCacheProps(virStorageSourcePtr src,
virJSONValuePtr props)
{
g_autoptr(virJSONValue) cacheobj = NULL;
bool direct = false;
bool noflush = false;
if (src->cachemode == VIR_DOMAIN_DISK_CACHE_DEFAULT)
return 0;
if (qemuDomainDiskCachemodeFlags(src->cachemode, NULL, &direct, &noflush) < 0)
return -1;
if (virJSONValueObjectCreate(&cacheobj,
"b:direct", direct,
"b:no-flush", noflush,
NULL) < 0)
return -1;
if (virJSONValueObjectAppend(props, "cache", &cacheobj) < 0)
return -1;
return 0;
}
/**
* qemuBlockStorageSourceGetBackendProps:
* @src: disk source
* @flags: bitwise-or of qemuBlockStorageSourceBackendPropsFlags
*
* Flags:
* QEMU_BLOCK_STORAGE_SOURCE_BACKEND_PROPS_LEGACY:
* use legacy formatting of attributes (for -drive / old qemus)
* QEMU_BLOCK_STORAGE_SOURCE_BACKEND_PROPS_TARGET_ONLY:
* omit any data which does not identify the image itself
* QEMU_BLOCK_STORAGE_SOURCE_BACKEND_PROPS_AUTO_READONLY:
* use the auto-read-only feature of qemu
* QEMU_BLOCK_STORAGE_SOURCE_BACKEND_PROPS_SKIP_UNMAP:
* don't enable 'discard:unmap' option for passing through discards
* (note that this is disabled also for _LEGACY and _TARGET_ONLY options)
*
* Creates a JSON object describing the underlying storage or protocol of a
* storage source. Returns NULL on error and reports an appropriate error message.
*/
virJSONValuePtr
qemuBlockStorageSourceGetBackendProps(virStorageSourcePtr src,
unsigned int flags)
{
int actualType = virStorageSourceGetActualType(src);
g_autoptr(virJSONValue) fileprops = NULL;
const char *driver = NULL;
virTristateBool aro = VIR_TRISTATE_BOOL_ABSENT;
virTristateBool ro = VIR_TRISTATE_BOOL_ABSENT;
bool onlytarget = flags & QEMU_BLOCK_STORAGE_SOURCE_BACKEND_PROPS_TARGET_ONLY;
bool legacy = flags & QEMU_BLOCK_STORAGE_SOURCE_BACKEND_PROPS_LEGACY;
if (flags & QEMU_BLOCK_STORAGE_SOURCE_BACKEND_PROPS_AUTO_READONLY) {
aro = VIR_TRISTATE_BOOL_YES;
} else {
if (src->readonly)
ro = VIR_TRISTATE_BOOL_YES;
else
ro = VIR_TRISTATE_BOOL_NO;
}
switch ((virStorageType)actualType) {
case VIR_STORAGE_TYPE_BLOCK:
case VIR_STORAGE_TYPE_FILE:
if (virStorageSourceIsBlockLocal(src)) {
if (src->hostcdrom)
driver = "host_cdrom";
else
driver = "host_device";
} else {
driver = "file";
}
if (!(fileprops = qemuBlockStorageSourceGetFileProps(src, onlytarget)))
return NULL;
break;
case VIR_STORAGE_TYPE_DIR:
/* qemu handles directories by exposing them as a device with emulated
* FAT filesystem */
if (!(fileprops = qemuBlockStorageSourceGetVvfatProps(src, onlytarget)))
return NULL;
break;
case VIR_STORAGE_TYPE_NVME:
if (!(fileprops = qemuBlockStorageSourceGetNVMeProps(src)))
return NULL;
break;
case VIR_STORAGE_TYPE_VHOST_USER:
virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
_("unable to create blockdev props for vhostuser disk type"));
return NULL;
case VIR_STORAGE_TYPE_VOLUME:
virReportError(VIR_ERR_INTERNAL_ERROR,
_("storage source pool '%s' volume '%s' is not translated"),
src->srcpool->pool, src->srcpool->volume);
return NULL;
case VIR_STORAGE_TYPE_NONE:
case VIR_STORAGE_TYPE_LAST:
virReportEnumRangeError(virStorageType, actualType);
return NULL;
case VIR_STORAGE_TYPE_NETWORK:
switch ((virStorageNetProtocol) src->protocol) {
case VIR_STORAGE_NET_PROTOCOL_GLUSTER:
driver = "gluster";
if (!(fileprops = qemuBlockStorageSourceGetGlusterProps(src, legacy, onlytarget)))
return NULL;
break;
case VIR_STORAGE_NET_PROTOCOL_VXHS:
driver = "vxhs";
if (!(fileprops = qemuBlockStorageSourceGetVxHSProps(src, onlytarget)))
return NULL;
break;
case VIR_STORAGE_NET_PROTOCOL_HTTP:
case VIR_STORAGE_NET_PROTOCOL_HTTPS:
case VIR_STORAGE_NET_PROTOCOL_FTP:
case VIR_STORAGE_NET_PROTOCOL_FTPS:
case VIR_STORAGE_NET_PROTOCOL_TFTP:
driver = virStorageNetProtocolTypeToString(src->protocol);
if (!(fileprops = qemuBlockStorageSourceGetCURLProps(src, onlytarget)))
return NULL;
break;
case VIR_STORAGE_NET_PROTOCOL_ISCSI:
driver = "iscsi";
if (!(fileprops = qemuBlockStorageSourceGetISCSIProps(src, onlytarget)))
return NULL;
break;
case VIR_STORAGE_NET_PROTOCOL_NBD:
driver = "nbd";
if (!(fileprops = qemuBlockStorageSourceGetNBDProps(src, onlytarget)))
return NULL;
break;
case VIR_STORAGE_NET_PROTOCOL_RBD:
driver = "rbd";
if (!(fileprops = qemuBlockStorageSourceGetRBDProps(src, onlytarget)))
return NULL;
break;
case VIR_STORAGE_NET_PROTOCOL_SHEEPDOG:
driver = "sheepdog";
if (!(fileprops = qemuBlockStorageSourceGetSheepdogProps(src)))
return NULL;
break;
case VIR_STORAGE_NET_PROTOCOL_SSH:
driver = "ssh";
if (!(fileprops = qemuBlockStorageSourceGetSshProps(src)))
return NULL;
break;
case VIR_STORAGE_NET_PROTOCOL_NFS:
driver = "nfs";
if (!(fileprops = qemuBlockStorageSourceGetNFSProps(src)))
return NULL;
break;
case VIR_STORAGE_NET_PROTOCOL_NONE:
case VIR_STORAGE_NET_PROTOCOL_LAST:
virReportEnumRangeError(virStorageNetProtocol, src->protocol);
return NULL;
}
break;
}
if (driver && virJSONValueObjectPrependString(fileprops, "driver", driver) < 0)
return NULL;
if (!onlytarget) {
if (qemuBlockNodeNameValidate(src->nodestorage) < 0 ||
virJSONValueObjectAdd(fileprops, "S:node-name", src->nodestorage, NULL) < 0)
return NULL;
if (!legacy) {
if (qemuBlockStorageSourceGetBlockdevGetCacheProps(src, fileprops) < 0)
return NULL;
if (virJSONValueObjectAdd(fileprops,
"T:read-only", ro,
"T:auto-read-only", aro,
NULL) < 0)
return NULL;
if (!(flags & QEMU_BLOCK_STORAGE_SOURCE_BACKEND_PROPS_SKIP_UNMAP) &&
virJSONValueObjectAdd(fileprops,
"s:discard", "unmap",
NULL) < 0)
return NULL;
}
}
return g_steal_pointer(&fileprops);
}
static int
qemuBlockStorageSourceGetFormatLUKSProps(virStorageSourcePtr src,
virJSONValuePtr props)
{
qemuDomainStorageSourcePrivatePtr srcPriv = QEMU_DOMAIN_STORAGE_SOURCE_PRIVATE(src);
if (!srcPriv || !srcPriv->encinfo || !srcPriv->encinfo->s.aes.alias) {
virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
_("missing secret info for 'luks' driver"));
return -1;
}
if (virJSONValueObjectAdd(props,
"s:driver", "luks",
"s:key-secret", srcPriv->encinfo->s.aes.alias,
NULL) < 0)
return -1;
return 0;
}
static int
qemuBlockStorageSourceGetFormatRawProps(virStorageSourcePtr src,
virJSONValuePtr props)
{
if (virJSONValueObjectAdd(props, "s:driver", "raw", NULL) < 0)
return -1;
/* Currently only storage slices are supported. We'll have to calculate
* the union of the slices here if we don't want to be adding needless
* 'raw' nodes. */
if (src->sliceStorage &&
virJSONValueObjectAdd(props,
"U:offset", src->sliceStorage->offset,
"U:size", src->sliceStorage->size,
NULL) < 0)
return -1;
return 0;
}
static int
qemuBlockStorageSourceGetCryptoProps(virStorageSourcePtr src,
virJSONValuePtr *encprops)
{
qemuDomainStorageSourcePrivatePtr srcpriv = QEMU_DOMAIN_STORAGE_SOURCE_PRIVATE(src);
const char *encformat = NULL;
*encprops = NULL;
/* qemu requires encrypted secrets regardless of encryption method used when
* passed using the blockdev infrastructure, thus only
* VIR_DOMAIN_SECRET_INFO_TYPE_AES works here. The correct type needs to be
* instantiated elsewhere. */
if (!src->encryption ||
!srcpriv ||
!srcpriv->encinfo ||
srcpriv->encinfo->type != VIR_DOMAIN_SECRET_INFO_TYPE_AES)
return 0;
switch ((virStorageEncryptionFormatType) src->encryption->format) {
case VIR_STORAGE_ENCRYPTION_FORMAT_QCOW:
encformat = "aes";
break;
case VIR_STORAGE_ENCRYPTION_FORMAT_LUKS:
encformat = "luks";
break;
case VIR_STORAGE_ENCRYPTION_FORMAT_DEFAULT:
case VIR_STORAGE_ENCRYPTION_FORMAT_LAST:
default:
virReportEnumRangeError(virStorageEncryptionFormatType,
src->encryption->format);
return -1;
}
return virJSONValueObjectCreate(encprops,
"s:format", encformat,
"s:key-secret", srcpriv->encinfo->s.aes.alias,
NULL);
}
static int
qemuBlockStorageSourceGetFormatQcowGenericProps(virStorageSourcePtr src,
const char *format,
virJSONValuePtr props)
{
g_autoptr(virJSONValue) encprops = NULL;
if (qemuBlockStorageSourceGetCryptoProps(src, &encprops) < 0)
return -1;
if (virJSONValueObjectAdd(props,
"s:driver", format,
"A:encrypt", &encprops, NULL) < 0)
return -1;
return 0;
}
static int
qemuBlockStorageSourceGetFormatQcow2Props(virStorageSourcePtr src,
virJSONValuePtr props)
{
/* currently unhandled qcow2 props:
*
* 'lazy-refcounts'
* 'pass-discard-request'
* 'pass-discard-snapshot'
* 'pass-discard-other'
* 'overlap-check'
* 'l2-cache-size'
* 'l2-cache-entry-size'
* 'refcount-cache-size'
* 'cache-clean-interval'
*/
if (qemuBlockStorageSourceGetFormatQcowGenericProps(src, "qcow2", props) < 0)
return -1;
/* 'cache-size' controls the maximum size of L2 and refcount caches.
* see: qemu.git/docs/qcow2-cache.txt
* https://git.qemu.org/?p=qemu.git;a=blob;f=docs/qcow2-cache.txt
*/
if (src->metadataCacheMaxSize > 0) {
if (virJSONValueObjectAdd(props,
"U:cache-size", src->metadataCacheMaxSize,
NULL) < 0)
return -1;
}
return 0;
}
static virJSONValuePtr
qemuBlockStorageSourceGetBlockdevFormatCommonProps(virStorageSourcePtr src)
{
const char *detectZeroes = NULL;
const char *discard = NULL;
int detectZeroesMode = virDomainDiskGetDetectZeroesMode(src->discard,
src->detect_zeroes);
g_autoptr(virJSONValue) props = NULL;
if (qemuBlockNodeNameValidate(src->nodeformat) < 0)
return NULL;
if (src->discard)
discard = virDomainDiskDiscardTypeToString(src->discard);
if (detectZeroesMode)
detectZeroes = virDomainDiskDetectZeroesTypeToString(detectZeroesMode);
/* currently unhandled global properties:
* '*force-share': 'bool'
*/
if (virJSONValueObjectCreate(&props,
"s:node-name", src->nodeformat,
"b:read-only", src->readonly,
"S:discard", discard,
"S:detect-zeroes", detectZeroes,
NULL) < 0)
return NULL;
if (qemuBlockStorageSourceGetBlockdevGetCacheProps(src, props) < 0)
return NULL;
return g_steal_pointer(&props);
}
static virJSONValuePtr
qemuBlockStorageSourceGetBlockdevFormatProps(virStorageSourcePtr src)
{
const char *driver = NULL;
g_autoptr(virJSONValue) props = NULL;
if (!(props = qemuBlockStorageSourceGetBlockdevFormatCommonProps(src)))
return NULL;
switch ((virStorageFileFormat) src->format) {
case VIR_STORAGE_FILE_FAT:
/* The fat layer is emulated by the storage access layer, so we need to
* put a raw layer on top */
case VIR_STORAGE_FILE_RAW:
if (src->encryption &&
src->encryption->format == VIR_STORAGE_ENCRYPTION_FORMAT_LUKS) {
if (qemuBlockStorageSourceGetFormatLUKSProps(src, props) < 0)
return NULL;
} else {
if (qemuBlockStorageSourceGetFormatRawProps(src, props) < 0)
return NULL;
}
break;
case VIR_STORAGE_FILE_QCOW2:
if (qemuBlockStorageSourceGetFormatQcow2Props(src, props) < 0)
return NULL;
break;
case VIR_STORAGE_FILE_QCOW:
if (qemuBlockStorageSourceGetFormatQcowGenericProps(src, "qcow", props) < 0)
return NULL;
break;
/* formats without any special parameters */
case VIR_STORAGE_FILE_PLOOP:
driver = "parallels";
break;
case VIR_STORAGE_FILE_VHD:
driver = "vhdx";
break;
case VIR_STORAGE_FILE_BOCHS:
case VIR_STORAGE_FILE_CLOOP:
case VIR_STORAGE_FILE_DMG:
case VIR_STORAGE_FILE_VDI:
case VIR_STORAGE_FILE_VPC:
case VIR_STORAGE_FILE_QED:
case VIR_STORAGE_FILE_VMDK:
driver = virStorageFileFormatTypeToString(src->format);
break;
case VIR_STORAGE_FILE_AUTO_SAFE:
case VIR_STORAGE_FILE_AUTO:
case VIR_STORAGE_FILE_NONE:
case VIR_STORAGE_FILE_COW:
case VIR_STORAGE_FILE_ISO:
case VIR_STORAGE_FILE_DIR:
virReportError(VIR_ERR_INTERNAL_ERROR,
_("mishandled storage format '%s'"),
virStorageFileFormatTypeToString(src->format));
return NULL;
case VIR_STORAGE_FILE_LAST:
default:
virReportEnumRangeError(virStorageFileFormat, src->format);
return NULL;
}
if (driver &&
virJSONValueObjectAdd(props, "s:driver", driver, NULL) < 0)
return NULL;
return g_steal_pointer(&props);
}
/**
* qemuBlockStorageSourceGetBlockdevProps:
*
* @src: storage source to format
* @backingStore: a storage source to use as backing of @src
*
* Formats @src into a JSON object which can be used with blockdev-add or
* -blockdev. The formatted object contains both the storage and format layer
* in nested form including link to the backing chain layer if necessary.
*/
virJSONValuePtr
qemuBlockStorageSourceGetBlockdevProps(virStorageSourcePtr src,
virStorageSourcePtr backingStore)
{
g_autoptr(virJSONValue) props = NULL;
const char *storagenode = src->nodestorage;
if (qemuBlockStorageSourceNeedsStorageSliceLayer(src))
storagenode = src->sliceStorage->nodename;
if (!(props = qemuBlockStorageSourceGetBlockdevFormatProps(src)))
return NULL;
if (virJSONValueObjectAppendString(props, "file", storagenode) < 0)
return NULL;
if (backingStore) {
if (src->format >= VIR_STORAGE_FILE_BACKING) {
if (virStorageSourceIsBacking(backingStore)) {
if (virJSONValueObjectAppendString(props, "backing",
backingStore->nodeformat) < 0)
return NULL;
} else {
/* chain is terminated, indicate that no detection should happen
* in qemu */
if (virJSONValueObjectAppendNull(props, "backing") < 0)
return NULL;
}
} else {
if (virStorageSourceIsBacking(backingStore)) {
virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
_("storage format '%s' does not support backing store"),
virStorageFileFormatTypeToString(src->format));
return NULL;
}
}
}
return g_steal_pointer(&props);
}
static virJSONValuePtr
qemuBlockStorageSourceGetBlockdevStorageSliceProps(virStorageSourcePtr src)
{
g_autoptr(virJSONValue) props = NULL;
if (qemuBlockNodeNameValidate(src->sliceStorage->nodename) < 0)
return NULL;
if (virJSONValueObjectCreate(&props,
"s:driver", "raw",
"s:node-name", src->sliceStorage->nodename,
"U:offset", src->sliceStorage->offset,
"U:size", src->sliceStorage->size,
"s:file", src->nodestorage,
"b:auto-read-only", true,
"s:discard", "unmap",
NULL) < 0)
return NULL;
if (qemuBlockStorageSourceGetBlockdevGetCacheProps(src, props) < 0)
return NULL;
return g_steal_pointer(&props);
}
void
qemuBlockStorageSourceAttachDataFree(qemuBlockStorageSourceAttachDataPtr data)
{
if (!data)
return;
virJSONValueFree(data->storageProps);
virJSONValueFree(data->storageSliceProps);
virJSONValueFree(data->formatProps);
virJSONValueFree(data->prmgrProps);
virJSONValueFree(data->authsecretProps);
virJSONValueFree(data->httpcookiesecretProps);
virJSONValueFree(data->encryptsecretProps);
virJSONValueFree(data->tlsProps);
virJSONValueFree(data->tlsKeySecretProps);
g_free(data->tlsAlias);
g_free(data->tlsKeySecretAlias);
g_free(data->authsecretAlias);
g_free(data->encryptsecretAlias);
g_free(data->httpcookiesecretAlias);
g_free(data->driveCmd);
g_free(data->driveAlias);
g_free(data->chardevAlias);
g_free(data->chardevCmd);
g_free(data);
}
/**
* qemuBlockStorageSourceAttachPrepareBlockdev:
* @src: storage source to prepare data from
* @backingStore: storage source to use as backing of @src
* @autoreadonly: use 'auto-read-only' feature of qemu
*
* Creates a qemuBlockStorageSourceAttachData structure containing data to attach
* @src to a VM using the blockdev-add approach. Note that this function only
* creates the data for the storage source itself, any other related
* authentication/encryption/... objects need to be prepared separately.
*
* The changes are then applied using qemuBlockStorageSourceAttachApply.
*
* Returns the filled data structure on success or NULL on error and a libvirt
* error is reported
*/
qemuBlockStorageSourceAttachDataPtr
qemuBlockStorageSourceAttachPrepareBlockdev(virStorageSourcePtr src,
virStorageSourcePtr backingStore,
bool autoreadonly)
{
g_autoptr(qemuBlockStorageSourceAttachData) data = NULL;
unsigned int backendpropsflags = 0;
if (autoreadonly)
backendpropsflags |= QEMU_BLOCK_STORAGE_SOURCE_BACKEND_PROPS_AUTO_READONLY;
data = g_new0(qemuBlockStorageSourceAttachData, 1);
if (!(data->formatProps = qemuBlockStorageSourceGetBlockdevProps(src,
backingStore)) ||
!(data->storageProps = qemuBlockStorageSourceGetBackendProps(src,
backendpropsflags)))
return NULL;
data->storageNodeName = src->nodestorage;
data->formatNodeName = src->nodeformat;
if (qemuBlockStorageSourceNeedsStorageSliceLayer(src)) {
if (!(data->storageSliceProps = qemuBlockStorageSourceGetBlockdevStorageSliceProps(src)))
return NULL;
data->storageSliceNodeName = src->sliceStorage->nodename;
}
return g_steal_pointer(&data);
}
static int
qemuBlockStorageSourceAttachApplyStorageDeps(qemuMonitorPtr mon,
qemuBlockStorageSourceAttachDataPtr data)
{
if (data->prmgrProps &&
qemuMonitorAddObject(mon, &data->prmgrProps, &data->prmgrAlias) < 0)
return -1;
if (data->authsecretProps &&
qemuMonitorAddObject(mon, &data->authsecretProps,
&data->authsecretAlias) < 0)
return -1;
if (data->httpcookiesecretProps &&
qemuMonitorAddObject(mon, &data->httpcookiesecretProps,
&data->httpcookiesecretAlias) < 0)
return -1;
if (data->tlsKeySecretProps &&
qemuMonitorAddObject(mon, &data->tlsKeySecretProps,
&data->tlsKeySecretAlias) < 0)
return -1;
if (data->tlsProps &&
qemuMonitorAddObject(mon, &data->tlsProps, &data->tlsAlias) < 0)
return -1;
return 0;
}
static int
qemuBlockStorageSourceAttachApplyStorage(qemuMonitorPtr mon,
qemuBlockStorageSourceAttachDataPtr data)
{
if (data->storageProps) {
if (qemuMonitorBlockdevAdd(mon, &data->storageProps) < 0)
return -1;
data->storageAttached = true;
}
return 0;
}
static int
qemuBlockStorageSourceAttachApplyFormatDeps(qemuMonitorPtr mon,
qemuBlockStorageSourceAttachDataPtr data)
{
if (data->encryptsecretProps &&
qemuMonitorAddObject(mon, &data->encryptsecretProps,
&data->encryptsecretAlias) < 0)
return -1;
return 0;
}
static int
qemuBlockStorageSourceAttachApplyFormat(qemuMonitorPtr mon,
qemuBlockStorageSourceAttachDataPtr data)
{
if (data->formatProps) {
if (qemuMonitorBlockdevAdd(mon, &data->formatProps) < 0)
return -1;
data->formatAttached = true;
}
return 0;
}
static int
qemuBlockStorageSourceAttachApplyStorageSlice(qemuMonitorPtr mon,
qemuBlockStorageSourceAttachDataPtr data)
{
if (data->storageSliceProps) {
if (qemuMonitorBlockdevAdd(mon, &data->storageSliceProps) < 0)
return -1;
data->storageSliceAttached = true;
}
return 0;
}
/**
* qemuBlockStorageSourceAttachApply:
* @mon: monitor object
* @data: structure holding data of block device to apply
*
* Attaches a virStorageSource definition converted to
* qemuBlockStorageSourceAttachData to a running VM. This function expects being
* called after the monitor was entered.
*
* Returns 0 on success and -1 on error with a libvirt error reported. If an
* error occurred, changes which were already applied need to be rolled back by
* calling qemuBlockStorageSourceAttachRollback.
*/
int
qemuBlockStorageSourceAttachApply(qemuMonitorPtr mon,
qemuBlockStorageSourceAttachDataPtr data)
{
if (qemuBlockStorageSourceAttachApplyStorageDeps(mon, data) < 0 ||
qemuBlockStorageSourceAttachApplyStorage(mon, data) < 0 ||
qemuBlockStorageSourceAttachApplyStorageSlice(mon, data) < 0 ||
qemuBlockStorageSourceAttachApplyFormatDeps(mon, data) < 0 ||
qemuBlockStorageSourceAttachApplyFormat(mon, data) < 0)
return -1;
if (data->driveCmd) {
if (qemuMonitorAddDrive(mon, data->driveCmd) < 0)
return -1;
data->driveAdded = true;
}
if (data->chardevDef) {
if (qemuMonitorAttachCharDev(mon, data->chardevAlias, data->chardevDef) < 0)
return -1;
data->chardevAdded = true;
}
return 0;
}
/**
* qemuBlockStorageSourceAttachRollback:
* @mon: monitor object
* @data: structure holding data of block device to roll back
*
* Attempts a best effort rollback of changes which were made to a running VM by
* qemuBlockStorageSourceAttachApply. Preserves any existing errors.
*
* This function expects being called after the monitor was entered.
*/
void
qemuBlockStorageSourceAttachRollback(qemuMonitorPtr mon,
qemuBlockStorageSourceAttachDataPtr data)
{
virErrorPtr orig_err;
virErrorPreserveLast(&orig_err);
if (data->chardevAdded) {
if (qemuMonitorDetachCharDev(mon, data->chardevAlias) < 0) {
VIR_WARN("Unable to remove chardev %s after failed " "qemuMonitorAddDevice",
data->chardevAlias);
}
}
if (data->driveAdded) {
if (qemuMonitorDriveDel(mon, data->driveAlias) < 0)
VIR_WARN("Unable to remove drive %s (%s) after failed "
"qemuMonitorAddDevice", data->driveAlias, data->driveCmd);
}
if (data->formatAttached)
ignore_value(qemuMonitorBlockdevDel(mon, data->formatNodeName));
if (data->storageSliceAttached)
ignore_value(qemuMonitorBlockdevDel(mon, data->storageSliceNodeName));
if (data->storageAttached)
ignore_value(qemuMonitorBlockdevDel(mon, data->storageNodeName));
if (data->prmgrAlias)
ignore_value(qemuMonitorDelObject(mon, data->prmgrAlias, false));
if (data->authsecretAlias)
ignore_value(qemuMonitorDelObject(mon, data->authsecretAlias, false));
if (data->encryptsecretAlias)
ignore_value(qemuMonitorDelObject(mon, data->encryptsecretAlias, false));
if (data->httpcookiesecretAlias)
ignore_value(qemuMonitorDelObject(mon, data->httpcookiesecretAlias, false));
if (data->tlsAlias)
ignore_value(qemuMonitorDelObject(mon, data->tlsAlias, false));
if (data->tlsKeySecretAlias)
ignore_value(qemuMonitorDelObject(mon, data->tlsKeySecretAlias, false));
virErrorRestore(&orig_err);
}
/**
* qemuBlockStorageSourceDetachPrepare:
* @src: disk source structure
* @driveAlias: Alias of the -drive backend, the pointer is always consumed
*
* Prepare qemuBlockStorageSourceAttachDataPtr for detaching a single source
* from a VM. If @driveAlias is NULL -blockdev is assumed.
*/
qemuBlockStorageSourceAttachDataPtr
qemuBlockStorageSourceDetachPrepare(virStorageSourcePtr src,
char *driveAlias)
{
qemuDomainStorageSourcePrivatePtr srcpriv = QEMU_DOMAIN_STORAGE_SOURCE_PRIVATE(src);
g_autoptr(qemuBlockStorageSourceAttachData) data = NULL;
data = g_new0(qemuBlockStorageSourceAttachData, 1);
if (driveAlias) {
data->driveAlias = g_steal_pointer(&driveAlias);
data->driveAdded = true;
} else {
data->formatNodeName = src->nodeformat;
data->formatAttached = true;
data->storageNodeName = src->nodestorage;
data->storageAttached = true;
/* 'raw' format doesn't need the extra 'raw' layer when slicing, thus
* the nodename is NULL */
if (src->sliceStorage &&
src->sliceStorage->nodename) {
data->storageSliceNodeName = src->sliceStorage->nodename;
data->storageSliceAttached = true;
}
}
if (src->pr &&
!virStoragePRDefIsManaged(src->pr))
data->prmgrAlias = g_strdup(src->pr->mgralias);
data->tlsAlias = g_strdup(src->tlsAlias);
if (srcpriv) {
if (srcpriv->secinfo && srcpriv->secinfo->type == VIR_DOMAIN_SECRET_INFO_TYPE_AES)
data->authsecretAlias = g_strdup(srcpriv->secinfo->s.aes.alias);
if (srcpriv->encinfo && srcpriv->encinfo->type == VIR_DOMAIN_SECRET_INFO_TYPE_AES)
data->encryptsecretAlias = g_strdup(srcpriv->encinfo->s.aes.alias);
if (srcpriv->httpcookie)
data->httpcookiesecretAlias = g_strdup(srcpriv->httpcookie->s.aes.alias);
if (srcpriv->tlsKeySecret)
data->tlsKeySecretAlias = g_strdup(srcpriv->tlsKeySecret->s.aes.alias);
}
return g_steal_pointer(&data);
}
void
qemuBlockStorageSourceChainDataFree(qemuBlockStorageSourceChainDataPtr data)
{
size_t i;
if (!data)
return;
for (i = 0; i < data->nsrcdata; i++)
qemuBlockStorageSourceAttachDataFree(data->srcdata[i]);
g_free(data->srcdata);
g_free(data);
}
/**
* qemuBlockStorageSourceChainDetachPrepareBlockdev
* @src: storage source chain to remove
*
* Prepares qemuBlockStorageSourceChainDataPtr for detaching @src and its
* backingStore if -blockdev was used.
*/
qemuBlockStorageSourceChainDataPtr
qemuBlockStorageSourceChainDetachPrepareBlockdev(virStorageSourcePtr src)
{
g_autoptr(qemuBlockStorageSourceAttachData) backend = NULL;
g_autoptr(qemuBlockStorageSourceChainData) data = NULL;
virStorageSourcePtr n;
data = g_new0(qemuBlockStorageSourceChainData, 1);
for (n = src; virStorageSourceIsBacking(n); n = n->backingStore) {
if (!(backend = qemuBlockStorageSourceDetachPrepare(n, NULL)))
return NULL;
if (VIR_APPEND_ELEMENT(data->srcdata, data->nsrcdata, backend) < 0)
return NULL;
}
return g_steal_pointer(&data);
}
/**
* qemuBlockStorageSourceChainDetachPrepareLegacy
* @src: storage source chain to remove
* @driveAlias: Alias of the 'drive' backend (always consumed)
*
* Prepares qemuBlockStorageSourceChainDataPtr for detaching @src and its
* backingStore if -drive was used.
*/
qemuBlockStorageSourceChainDataPtr
qemuBlockStorageSourceChainDetachPrepareDrive(virStorageSourcePtr src,
char *driveAlias)
{
g_autoptr(qemuBlockStorageSourceAttachData) backend = NULL;
g_autoptr(qemuBlockStorageSourceChainData) data = NULL;
data = g_new0(qemuBlockStorageSourceChainData, 1);
if (!(backend = qemuBlockStorageSourceDetachPrepare(src, driveAlias)))
return NULL;
if (VIR_APPEND_ELEMENT(data->srcdata, data->nsrcdata, backend) < 0)
return NULL;
return g_steal_pointer(&data);
}
/**
* qemuBlockStorageSourceChainDetachPrepareChardev
* @src: storage source chain to remove
*
* Prepares qemuBlockStorageSourceChainDataPtr for detaching @src and its
* backingStore if -chardev was used.
*/
qemuBlockStorageSourceChainDataPtr
qemuBlockStorageSourceChainDetachPrepareChardev(char *chardevAlias)
{
g_autoptr(qemuBlockStorageSourceAttachData) backend = NULL;
g_autoptr(qemuBlockStorageSourceChainData) data = NULL;
data = g_new0(qemuBlockStorageSourceChainData, 1);
backend = g_new0(qemuBlockStorageSourceAttachData, 1);
backend->chardevAlias = chardevAlias;
backend->chardevAdded = true;
if (VIR_APPEND_ELEMENT(data->srcdata, data->nsrcdata, backend) < 0)
return NULL;
return g_steal_pointer(&data);
}
/**
* qemuBlockStorageSourceChainAttach:
* @mon: monitor object
* @data: storage source chain data
*
* Attach a storage source including its backing chain and supporting objects.
* Caller must enter @mon prior calling this function. In case of error this
* function returns -1. @data is updated so that qemuBlockStorageSourceChainDetach
* can be used to roll-back the changes.
*/
int
qemuBlockStorageSourceChainAttach(qemuMonitorPtr mon,
qemuBlockStorageSourceChainDataPtr data)
{
size_t i;
for (i = data->nsrcdata; i > 0; i--) {
if (qemuBlockStorageSourceAttachApply(mon, data->srcdata[i - 1]) < 0)
return -1;
}
return 0;
}
/**
* qemuBlockStorageSourceChainDetach:
* @mon: monitor object
* @data: storage source chain data
*
* Detach a unused storage source including all its backing chain and related
* objects described by @data.
*/
void
qemuBlockStorageSourceChainDetach(qemuMonitorPtr mon,
qemuBlockStorageSourceChainDataPtr data)
{
size_t i;
for (i = 0; i < data->nsrcdata; i++)
qemuBlockStorageSourceAttachRollback(mon, data->srcdata[i]);
}
/**
* qemuBlockStorageSourceDetachOneBlockdev:
* @driver: qemu driver object
* @vm: domain object
* @asyncJob: currently running async job
* @src: storage source to detach
*
* Detaches one virStorageSource using blockdev-del. Note that this does not
* detach any authentication/encryption objects. This function enters the
* monitor internally.
*/
int
qemuBlockStorageSourceDetachOneBlockdev(virQEMUDriverPtr driver,
virDomainObjPtr vm,
qemuDomainAsyncJob asyncJob,
virStorageSourcePtr src)
{
int ret;
if (qemuDomainObjEnterMonitorAsync(driver, vm, asyncJob) < 0)
return -1;
ret = qemuMonitorBlockdevDel(qemuDomainGetMonitor(vm), src->nodeformat);
if (ret == 0)
ret = qemuMonitorBlockdevDel(qemuDomainGetMonitor(vm), src->nodestorage);
if (qemuDomainObjExitMonitor(driver, vm) < 0)
return -1;
return ret;
}
int
qemuBlockSnapshotAddLegacy(virJSONValuePtr actions,
virDomainDiskDefPtr disk,
virStorageSourcePtr newsrc,
bool reuse)
{
const char *format = virStorageFileFormatTypeToString(newsrc->format);
g_autofree char *device = NULL;
g_autofree char *source = NULL;
if (!(device = qemuAliasDiskDriveFromDisk(disk)))
return -1;
if (qemuGetDriveSourceString(newsrc, NULL, &source) < 0)
return -1;
return qemuMonitorTransactionSnapshotLegacy(actions, device, source, format, reuse);
}
int
qemuBlockSnapshotAddBlockdev(virJSONValuePtr actions,
virDomainDiskDefPtr disk,
virStorageSourcePtr newsrc)
{
return qemuMonitorTransactionSnapshotBlockdev(actions,
disk->src->nodeformat,
newsrc->nodeformat);
}
/**
* qemuBlockStorageGetCopyOnReadProps:
* @disk: disk with copy-on-read enabled
*
* Creates blockdev properties for a disk copy-on-read layer.
*/
virJSONValuePtr
qemuBlockStorageGetCopyOnReadProps(virDomainDiskDefPtr disk)
{
qemuDomainDiskPrivatePtr priv = QEMU_DOMAIN_DISK_PRIVATE(disk);
virJSONValuePtr ret = NULL;
ignore_value(virJSONValueObjectCreate(&ret,
"s:driver", "copy-on-read",
"s:node-name", priv->nodeCopyOnRead,
"s:file", disk->src->nodeformat,
NULL));
return ret;
}
/**
* qemuBlockGetBackingStoreString:
* @src: storage source to get the string for
* @pretty: pretty-print the JSON (if applicable, used by tests)
*
* Formats a string used in the backing store field of a disk image which
* supports backing store. Non-local storage may result in use of the json:
* pseudo protocol for any complex configuration.
*/
char *
qemuBlockGetBackingStoreString(virStorageSourcePtr src,
bool pretty)
{
int actualType = virStorageSourceGetActualType(src);
g_autoptr(virJSONValue) backingProps = NULL;
g_autoptr(virJSONValue) sliceProps = NULL;
virJSONValuePtr props = NULL;
g_autoptr(virURI) uri = NULL;
g_autofree char *backingJSON = NULL;
if (!src->sliceStorage) {
if (virStorageSourceIsLocalStorage(src)) {
if (src->type == VIR_STORAGE_TYPE_DIR &&
src->format == VIR_STORAGE_FILE_FAT)
return g_strdup_printf("fat:%s", src->path);
return g_strdup(src->path);
}
/* generate simplified URIs for the easy cases */
if (actualType == VIR_STORAGE_TYPE_NETWORK &&
src->nhosts == 1 &&
src->hosts->transport == VIR_STORAGE_NET_HOST_TRANS_TCP &&
src->timeout == 0 &&
src->ncookies == 0 &&
src->sslverify == VIR_TRISTATE_BOOL_ABSENT &&
src->timeout == 0 &&
src->readahead == 0) {
switch ((virStorageNetProtocol) src->protocol) {
case VIR_STORAGE_NET_PROTOCOL_NBD:
case VIR_STORAGE_NET_PROTOCOL_HTTP:
case VIR_STORAGE_NET_PROTOCOL_HTTPS:
case VIR_STORAGE_NET_PROTOCOL_FTP:
case VIR_STORAGE_NET_PROTOCOL_FTPS:
case VIR_STORAGE_NET_PROTOCOL_TFTP:
case VIR_STORAGE_NET_PROTOCOL_ISCSI:
case VIR_STORAGE_NET_PROTOCOL_GLUSTER:
if (!(uri = qemuBlockStorageSourceGetURI(src)))
return NULL;
return virURIFormat(uri);
case VIR_STORAGE_NET_PROTOCOL_SHEEPDOG:
case VIR_STORAGE_NET_PROTOCOL_RBD:
case VIR_STORAGE_NET_PROTOCOL_VXHS:
case VIR_STORAGE_NET_PROTOCOL_NFS:
case VIR_STORAGE_NET_PROTOCOL_SSH:
case VIR_STORAGE_NET_PROTOCOL_LAST:
case VIR_STORAGE_NET_PROTOCOL_NONE:
break;
}
}
}
/* use json: pseudo protocol otherwise */
if (!(backingProps = qemuBlockStorageSourceGetBackendProps(src,
QEMU_BLOCK_STORAGE_SOURCE_BACKEND_PROPS_TARGET_ONLY)))
return NULL;
props = backingProps;
if (src->sliceStorage) {
if (virJSONValueObjectCreate(&sliceProps,
"s:driver", "raw",
"U:offset", src->sliceStorage->offset,
"U:size", src->sliceStorage->size,
"a:file", &backingProps,
NULL) < 0)
return NULL;
props = sliceProps;
}
if (!(backingJSON = virJSONValueToString(props, pretty)))
return NULL;
return g_strdup_printf("json:{\"file\":%s}", backingJSON);
}
static int
qemuBlockStorageSourceCreateAddBacking(virStorageSourcePtr backing,
virJSONValuePtr props,
bool format)
{
g_autofree char *backingFileStr = NULL;
const char *backingFormatStr = NULL;
if (!virStorageSourceIsBacking(backing))
return 0;
if (format) {
if (backing->encryption &&
backing->encryption->format == VIR_STORAGE_ENCRYPTION_FORMAT_LUKS)
backingFormatStr = "luks";
else
backingFormatStr = virStorageFileFormatTypeToString(backing->format);
}
if (!(backingFileStr = qemuBlockGetBackingStoreString(backing, false)))
return -1;
if (virJSONValueObjectAdd(props,
"S:backing-file", backingFileStr,
"S:backing-fmt", backingFormatStr,
NULL) < 0)
return -1;
return 0;
}
static int
qemuBlockStorageSourceCreateGetFormatPropsGeneric(virStorageSourcePtr src,
const char *driver,
virJSONValuePtr *retprops,
virStorageSourcePtr backing)
{
g_autoptr(virJSONValue) props = NULL;
if (virJSONValueObjectCreate(&props,
"s:driver", driver,
"s:file", src->nodestorage,
"U:size", src->capacity,
NULL) < 0)
return -1;
if (backing &&
qemuBlockStorageSourceCreateAddBacking(backing, props, false) < 0)
return -1;
*retprops = g_steal_pointer(&props);
return 0;
}
static int
qemuBlockStorageSourceCreateGetEncryptionLUKS(virStorageSourcePtr src,
virJSONValuePtr *luksProps)
{
qemuDomainStorageSourcePrivatePtr srcpriv = QEMU_DOMAIN_STORAGE_SOURCE_PRIVATE(src);
g_autoptr(virJSONValue) props = NULL;
g_autofree char *cipheralg = NULL;
const char *keysecret = NULL;
if (srcpriv &&
srcpriv->encinfo &&
srcpriv->encinfo->type == VIR_DOMAIN_SECRET_INFO_TYPE_AES)
keysecret = srcpriv->encinfo->s.aes.alias;
if (virJSONValueObjectCreate(&props,
"s:key-secret", keysecret,
NULL) < 0)
return -1;
if (src->encryption) {
if (src->encryption->encinfo.cipher_name) {
cipheralg = g_strdup_printf("%s-%u",
src->encryption->encinfo.cipher_name,
src->encryption->encinfo.cipher_size);
}
if (virJSONValueObjectAdd(props,
"S:cipher-alg", cipheralg,
"S:cipher-mode", src->encryption->encinfo.cipher_mode,
"S:hash-alg", src->encryption->encinfo.cipher_hash,
"S:ivgen-alg", src->encryption->encinfo.ivgen_name,
"S:ivgen-hash-alg", src->encryption->encinfo.ivgen_hash,
NULL) < 0)
return -1;
}
*luksProps = g_steal_pointer(&props);
return 0;
}
static int
qemuBlockStorageSourceCreateGetFormatPropsLUKS(virStorageSourcePtr src,
virJSONValuePtr *props)
{
g_autoptr(virJSONValue) luksprops = NULL;
if (qemuBlockStorageSourceCreateGetEncryptionLUKS(src, &luksprops) < 0)
return -1;
if (virJSONValueObjectAdd(luksprops,
"s:driver", "luks",
"s:file", src->nodestorage,
"U:size", src->capacity,
NULL) < 0)
return -1;
*props = g_steal_pointer(&luksprops);
return 0;
}
static int
qemuBlockStorageSourceCreateAddEncryptionQcow(virStorageSourcePtr src,
virJSONValuePtr props)
{
g_autoptr(virJSONValue) encryptProps = NULL;
if (!src->encryption)
return 0;
if (src->encryption->format != VIR_STORAGE_ENCRYPTION_FORMAT_LUKS) {
virReportError(VIR_ERR_OPERATION_UNSUPPORTED, "%s",
_("creation of qcow/qcow2 files supports only 'luks' encryption"));
return -1;
}
if (qemuBlockStorageSourceCreateGetEncryptionLUKS(src, &encryptProps) < 0)
return -1;
if (virJSONValueObjectAdd(encryptProps, "s:format", "luks", NULL) < 0)
return -1;
if (virJSONValueObjectAdd(props, "a:encrypt", &encryptProps, NULL) < 0)
return -1;
return 0;
}
static int
qemuBlockStorageSourceCreateGetFormatPropsQcow2(virStorageSourcePtr src,
virStorageSourcePtr backing,
virJSONValuePtr *props)
{
g_autoptr(virJSONValue) qcow2props = NULL;
const char *qcow2version = NULL;
if (STREQ_NULLABLE(src->compat, "0.10"))
qcow2version = "v2";
else if (STREQ_NULLABLE(src->compat, "1.1"))
qcow2version = "v3";
if (virJSONValueObjectCreate(&qcow2props,
"s:driver", "qcow2",
"s:file", src->nodestorage,
"U:size", src->capacity,
"S:version", qcow2version,
"P:cluster-size", src->clusterSize,
NULL) < 0)
return -1;
if (qemuBlockStorageSourceCreateAddBacking(backing, qcow2props, true) < 0 ||
qemuBlockStorageSourceCreateAddEncryptionQcow(src, qcow2props) < 0)
return -1;
*props = g_steal_pointer(&qcow2props);
return 0;
}
static int
qemuBlockStorageSourceCreateGetFormatPropsQcow(virStorageSourcePtr src,
virStorageSourcePtr backing,
virJSONValuePtr *props)
{
g_autoptr(virJSONValue) qcowprops = NULL;
if (virJSONValueObjectCreate(&qcowprops,
"s:driver", "qcow",
"s:file", src->nodestorage,
"U:size", src->capacity,
NULL) < 0)
return -1;
if (qemuBlockStorageSourceCreateAddBacking(backing, qcowprops, false) < 0 ||
qemuBlockStorageSourceCreateAddEncryptionQcow(src, qcowprops) < 0)
return -1;
*props = g_steal_pointer(&qcowprops);
return 0;
}
static int
qemuBlockStorageSourceCreateGetFormatPropsQed(virStorageSourcePtr src,
virStorageSourcePtr backing,
virJSONValuePtr *props)
{
g_autoptr(virJSONValue) qedprops = NULL;
if (virJSONValueObjectCreate(&qedprops,
"s:driver", "qed",
"s:file", src->nodestorage,
"U:size", src->capacity,
NULL) < 0)
return -1;
if (qemuBlockStorageSourceCreateAddBacking(backing, qedprops, true) < 0)
return -1;
*props = g_steal_pointer(&qedprops);
return 0;
}
/**
* qemuBlockStorageSourceCreateGetFormatProps:
* @src: storage source to format
* @backing: storage source describing backing image of @src (if necessary)
* @props: filled with props to be used with 'blockdev-create' to format @src
*
* @src must be properly initialized to contain node-names of the protocol layer
* which should be formatted. @props may be NULL with success returned in which
* case creation of given storage format is not supported. Note that creation
* of 'raw' storage is also returns NULL as there is nothing to do.
*/
int
qemuBlockStorageSourceCreateGetFormatProps(virStorageSourcePtr src,
virStorageSourcePtr backing,
virJSONValuePtr *props)
{
switch ((virStorageFileFormat) src->format) {
case VIR_STORAGE_FILE_RAW:
if (!src->encryption ||
src->encryption->format != VIR_STORAGE_ENCRYPTION_FORMAT_LUKS)
return 0;
return qemuBlockStorageSourceCreateGetFormatPropsLUKS(src, props);
case VIR_STORAGE_FILE_QCOW2:
return qemuBlockStorageSourceCreateGetFormatPropsQcow2(src, backing, props);
case VIR_STORAGE_FILE_QCOW:
return qemuBlockStorageSourceCreateGetFormatPropsQcow(src, backing, props);
case VIR_STORAGE_FILE_QED:
return qemuBlockStorageSourceCreateGetFormatPropsQed(src, backing, props);
case VIR_STORAGE_FILE_VPC:
return qemuBlockStorageSourceCreateGetFormatPropsGeneric(src, "vpc",
props, NULL);
case VIR_STORAGE_FILE_PLOOP:
return qemuBlockStorageSourceCreateGetFormatPropsGeneric(src, "parallels",
props, NULL);
case VIR_STORAGE_FILE_VDI:
return qemuBlockStorageSourceCreateGetFormatPropsGeneric(src, "vdi",
props, NULL);
case VIR_STORAGE_FILE_VHD:
return qemuBlockStorageSourceCreateGetFormatPropsGeneric(src, "vhdx",
props, NULL);
case VIR_STORAGE_FILE_VMDK:
return qemuBlockStorageSourceCreateGetFormatPropsGeneric(src, "vmdk",
props, backing);
/* unsupported by qemu / impossible */
case VIR_STORAGE_FILE_FAT:
case VIR_STORAGE_FILE_BOCHS:
case VIR_STORAGE_FILE_CLOOP:
case VIR_STORAGE_FILE_DMG:
case VIR_STORAGE_FILE_COW:
case VIR_STORAGE_FILE_ISO:
case VIR_STORAGE_FILE_DIR:
return 0;
case VIR_STORAGE_FILE_AUTO_SAFE:
case VIR_STORAGE_FILE_AUTO:
case VIR_STORAGE_FILE_NONE:
virReportError(VIR_ERR_INTERNAL_ERROR,
_("mishandled storage format '%s'"),
virStorageFileFormatTypeToString(src->format));
return -1;
case VIR_STORAGE_FILE_LAST:
default:
break;
}
virReportEnumRangeError(virStorageFileFormat, src->format);
return -1;
}
/**
* qemuBlockStorageSourceCreateGetStorageProps:
* @src: storage source to create
* @props: filled with props to be used with 'blockdev-create' to create @src
*
* This function should be used only if @src->type is VIR_STORAGE_TYPE_NETWORK.
* Note that @props may be NULL if qemu does not support creation storage
* on given protocol. @src->physical is used as size for the storage.
*/
int
qemuBlockStorageSourceCreateGetStorageProps(virStorageSourcePtr src,
virJSONValuePtr *props)
{
int actualType = virStorageSourceGetActualType(src);
g_autoptr(virJSONValue) location = NULL;
const char *driver = NULL;
const char *filename = NULL;
switch ((virStorageType) actualType) {
case VIR_STORAGE_TYPE_FILE:
driver = "file";
filename = src->path;
break;
case VIR_STORAGE_TYPE_NETWORK:
switch ((virStorageNetProtocol) src->protocol) {
case VIR_STORAGE_NET_PROTOCOL_GLUSTER:
driver = "gluster";
if (!(location = qemuBlockStorageSourceGetGlusterProps(src, false, false)))
return -1;
break;
case VIR_STORAGE_NET_PROTOCOL_RBD:
driver = "rbd";
if (!(location = qemuBlockStorageSourceGetRBDProps(src, false)))
return -1;
break;
case VIR_STORAGE_NET_PROTOCOL_SHEEPDOG:
driver = "sheepdog";
if (!(location = qemuBlockStorageSourceGetSheepdogProps(src)))
return -1;
break;
case VIR_STORAGE_NET_PROTOCOL_SSH:
driver = "ssh";
if (!(location = qemuBlockStorageSourceGetSshProps(src)))
return -1;
break;
case VIR_STORAGE_NET_PROTOCOL_NFS:
driver = "nfs";
if (!(location = qemuBlockStorageSourceGetNFSProps(src)))
return -1;
break;
/* unsupported/impossible */
case VIR_STORAGE_NET_PROTOCOL_NBD:
case VIR_STORAGE_NET_PROTOCOL_ISCSI:
case VIR_STORAGE_NET_PROTOCOL_VXHS:
case VIR_STORAGE_NET_PROTOCOL_HTTP:
case VIR_STORAGE_NET_PROTOCOL_HTTPS:
case VIR_STORAGE_NET_PROTOCOL_FTP:
case VIR_STORAGE_NET_PROTOCOL_FTPS:
case VIR_STORAGE_NET_PROTOCOL_TFTP:
case VIR_STORAGE_NET_PROTOCOL_NONE:
case VIR_STORAGE_NET_PROTOCOL_LAST:
return 0;
}
break;
case VIR_STORAGE_TYPE_BLOCK:
case VIR_STORAGE_TYPE_DIR:
case VIR_STORAGE_TYPE_VOLUME:
case VIR_STORAGE_TYPE_NVME:
case VIR_STORAGE_TYPE_VHOST_USER:
return 0;
case VIR_STORAGE_TYPE_NONE:
case VIR_STORAGE_TYPE_LAST:
virReportEnumRangeError(virStorageType, actualType);
return -1;
}
if (virJSONValueObjectCreate(props,
"s:driver", driver,
"S:filename", filename,
"A:location", &location,
"U:size", src->physical,
NULL) < 0)
return -1;
return 0;
}
static int
qemuBlockStorageSourceCreateGeneric(virDomainObjPtr vm,
virJSONValuePtr createProps,
virStorageSourcePtr src,
virStorageSourcePtr chain,
bool storageCreate,
qemuDomainAsyncJob asyncJob)
{
g_autoptr(virJSONValue) props = createProps;
qemuDomainObjPrivatePtr priv = vm->privateData;
qemuBlockJobDataPtr job = NULL;
int ret = -1;
int rc;
if (!(job = qemuBlockJobNewCreate(vm, src, chain, storageCreate)))
return -1;
qemuBlockJobSyncBegin(job);
if (qemuDomainObjEnterMonitorAsync(priv->driver, vm, asyncJob) < 0)
goto cleanup;
rc = qemuMonitorBlockdevCreate(priv->mon, job->name, props);
props = NULL;
if (qemuDomainObjExitMonitor(priv->driver, vm) < 0 || rc < 0)
goto cleanup;
qemuBlockJobStarted(job, vm);
qemuBlockJobUpdate(vm, job, asyncJob);
while (qemuBlockJobIsRunning(job)) {
if (virDomainObjWait(vm) < 0)
goto cleanup;
qemuBlockJobUpdate(vm, job, asyncJob);
}
if (job->state == QEMU_BLOCKJOB_STATE_FAILED ||
job->state == QEMU_BLOCKJOB_STATE_CANCELLED) {
if (job->state == QEMU_BLOCKJOB_STATE_CANCELLED && !job->errmsg) {
virReportError(VIR_ERR_OPERATION_FAILED, "%s",
_("blockdev-create job was cancelled"));
} else {
virReportError(VIR_ERR_OPERATION_FAILED,
_("failed to format image: '%s'"), NULLSTR(job->errmsg));
}
goto cleanup;
}
ret = 0;
cleanup:
qemuBlockJobStartupFinalize(vm, job);
return ret;
}
static int
qemuBlockStorageSourceCreateStorage(virDomainObjPtr vm,
virStorageSourcePtr src,
virStorageSourcePtr chain,
qemuDomainAsyncJob asyncJob)
{
int actualType = virStorageSourceGetActualType(src);
g_autoptr(virJSONValue) createstorageprops = NULL;
int ret;
/* We create local files directly to be able to apply security labels
* properly. This is enough for formats which store the capacity of the image
* in the metadata as they will grow. We must create a correctly sized
* image for 'raw' and 'luks' though as the image size influences the
* capacity.
*/
if (actualType != VIR_STORAGE_TYPE_NETWORK &&
!(actualType == VIR_STORAGE_TYPE_FILE && src->format == VIR_STORAGE_FILE_RAW))
return 0;
if (qemuBlockStorageSourceCreateGetStorageProps(src, &createstorageprops) < 0)
return -1;
if (!createstorageprops) {
/* we can always try opening it to see whether it was existing */
return 0;
}
ret = qemuBlockStorageSourceCreateGeneric(vm, createstorageprops, src, chain,
true, asyncJob);
createstorageprops = NULL;
return ret;
}
static int
qemuBlockStorageSourceCreateFormat(virDomainObjPtr vm,
virStorageSourcePtr src,
virStorageSourcePtr backingStore,
virStorageSourcePtr chain,
qemuDomainAsyncJob asyncJob)
{
g_autoptr(virJSONValue) createformatprops = NULL;
int ret;
if (src->format == VIR_STORAGE_FILE_RAW &&
!src->encryption)
return 0;
if (qemuBlockStorageSourceCreateGetFormatProps(src, backingStore,
&createformatprops) < 0)
return -1;
if (!createformatprops) {
virReportError(VIR_ERR_OPERATION_UNSUPPORTED,
_("can't create storage format '%s'"),
virStorageFileFormatTypeToString(src->format));
return -1;
}
ret = qemuBlockStorageSourceCreateGeneric(vm, createformatprops, src, chain,
false, asyncJob);
createformatprops = NULL;
return ret;
}
/**
* qemuBlockStorageSourceCreate:
* @vm: domain object
* @src: storage source definition to create
* @backingStore: backingStore of the new image (used only in image metadata)
* @chain: backing chain to unplug in case of a long-running job failure
* @data: qemuBlockStorageSourceAttachData for @src so that it can be attached
* @asyncJob: qemu asynchronous job type
*
* Creates and formats a storage volume according to @src and attaches it to @vm.
* @data must provide attachment data as if @src was existing. @src is attached
* after successful return of this function. If libvirtd is restarted during
* the create job @chain is unplugged, otherwise it's left for the caller.
* If @backingStore is provided, the new image will refer to it as its backing
* store.
*/
int
qemuBlockStorageSourceCreate(virDomainObjPtr vm,
virStorageSourcePtr src,
virStorageSourcePtr backingStore,
virStorageSourcePtr chain,
qemuBlockStorageSourceAttachDataPtr data,
qemuDomainAsyncJob asyncJob)
{
qemuDomainObjPrivatePtr priv = vm->privateData;
int ret = -1;
int rc;
if (src->sliceStorage) {
virReportError(VIR_ERR_OPERATION_UNSUPPORTED, "%s",
_("creation of images with slice type='storage' is not supported"));
return -1;
}
/* grant write access to read-only images during formatting */
if (src->readonly &&
qemuDomainStorageSourceAccessAllow(priv->driver, vm, src, false,
false, true) < 0)
return -1;
if (qemuDomainObjEnterMonitorAsync(priv->driver, vm, asyncJob) < 0)
goto cleanup;
rc = qemuBlockStorageSourceAttachApplyStorageDeps(priv->mon, data);
if (qemuDomainObjExitMonitor(priv->driver, vm) < 0 || rc < 0)
goto cleanup;
if (qemuBlockStorageSourceCreateStorage(vm, src, chain, asyncJob) < 0)
goto cleanup;
if (qemuDomainObjEnterMonitorAsync(priv->driver, vm, asyncJob) < 0)
goto cleanup;
rc = qemuBlockStorageSourceAttachApplyStorage(priv->mon, data);
if (rc == 0)
rc = qemuBlockStorageSourceAttachApplyFormatDeps(priv->mon, data);
if (qemuDomainObjExitMonitor(priv->driver, vm) < 0 || rc < 0)
goto cleanup;
if (qemuBlockStorageSourceCreateFormat(vm, src, backingStore, chain,
asyncJob) < 0)
goto cleanup;
/* revoke write access to read-only images during formatting */
if (src->readonly &&
qemuDomainStorageSourceAccessAllow(priv->driver, vm, src, true,
false, true) < 0)
goto cleanup;
if (qemuDomainObjEnterMonitorAsync(priv->driver, vm, asyncJob) < 0)
goto cleanup;
rc = qemuBlockStorageSourceAttachApplyFormat(priv->mon, data);
if (qemuDomainObjExitMonitor(priv->driver, vm) < 0 || rc < 0)
goto cleanup;
ret = 0;
cleanup:
if (ret < 0 &&
virDomainObjIsActive(vm) &&
qemuDomainObjEnterMonitorAsync(priv->driver, vm, asyncJob) == 0) {
qemuBlockStorageSourceAttachRollback(priv->mon, data);
ignore_value(qemuDomainObjExitMonitor(priv->driver, vm));
}
return ret;
}
/**
* qemuBlockStorageSourceCreateDetectSize:
* @blockNamedNodeData: hash table filled with qemuBlockNamedNodeData
* @src: storage source to update size/capacity on
* @templ: storage source template
*
* When creating a storage source via blockdev-create we need to know the size
* and capacity of the original volume (e.g. when creating a snapshot or copy).
* This function updates @src's 'capacity' and 'physical' attributes according
* to the detected sizes from @templ.
*/
int
qemuBlockStorageSourceCreateDetectSize(GHashTable *blockNamedNodeData,
virStorageSourcePtr src,
virStorageSourcePtr templ)
{
qemuBlockNamedNodeDataPtr entry;
if (!(entry = virHashLookup(blockNamedNodeData, templ->nodeformat))) {
virReportError(VIR_ERR_INTERNAL_ERROR,
_("failed to update capacity data for block node '%s'"),
templ->nodeformat);
return -1;
}
/* propagate cluster size if the images are compatible */
if (templ->format == VIR_STORAGE_FILE_QCOW2 &&
src->format == VIR_STORAGE_FILE_QCOW2 &&
src->clusterSize == 0)
src->clusterSize = entry->clusterSize;
if (src->format == VIR_STORAGE_FILE_RAW) {
src->physical = entry->capacity;
} else {
src->physical = entry->physical;
}
src->capacity = entry->capacity;
return 0;
}
int
qemuBlockRemoveImageMetadata(virQEMUDriverPtr driver,
virDomainObjPtr vm,
const char *diskTarget,
virStorageSourcePtr src)
{
virStorageSourcePtr n;
int ret = 0;
for (n = src; virStorageSourceIsBacking(n); n = n->backingStore) {
if (qemuSecurityMoveImageMetadata(driver, vm, n, NULL) < 0) {
VIR_WARN("Unable to remove disk metadata on "
"vm %s from %s (disk target %s)",
vm->def->name,
NULLSTR(n->path),
diskTarget);
ret = -1;
}
}
return ret;
}
/**
* qemuBlockNamedNodeDataGetBitmapByName:
* @blockNamedNodeData: hash table returned by qemuMonitorBlockGetNamedNodeData
* @src: disk source to find the bitmap for
* @bitmap: name of the bitmap to find
*
* Looks up a bitmap named @bitmap of the @src image.
*/
qemuBlockNamedNodeDataBitmapPtr
qemuBlockNamedNodeDataGetBitmapByName(GHashTable *blockNamedNodeData,
virStorageSourcePtr src,
const char *bitmap)
{
qemuBlockNamedNodeDataPtr nodedata;
size_t i;
if (!(nodedata = virHashLookup(blockNamedNodeData, src->nodeformat)))
return NULL;
for (i = 0; i < nodedata->nbitmaps; i++) {
qemuBlockNamedNodeDataBitmapPtr bitmapdata = nodedata->bitmaps[i];
if (STRNEQ(bitmapdata->name, bitmap))
continue;
return bitmapdata;
}
return NULL;
}
GHashTable *
qemuBlockGetNamedNodeData(virDomainObjPtr vm,
qemuDomainAsyncJob asyncJob)
{
qemuDomainObjPrivatePtr priv = vm->privateData;
virQEMUDriverPtr driver = priv->driver;
g_autoptr(GHashTable) blockNamedNodeData = NULL;
bool supports_flat = virQEMUCapsGet(priv->qemuCaps,
QEMU_CAPS_QMP_QUERY_NAMED_BLOCK_NODES_FLAT);
if (qemuDomainObjEnterMonitorAsync(driver, vm, asyncJob) < 0)
return NULL;
blockNamedNodeData = qemuMonitorBlockGetNamedNodeData(priv->mon, supports_flat);
if (qemuDomainObjExitMonitor(driver, vm) < 0 || !blockNamedNodeData)
return NULL;
return g_steal_pointer(&blockNamedNodeData);
}
/**
* qemuBlockGetBitmapMergeActionsGetBitmaps:
*
* Collect a list of bitmaps which need to be handled in
* qemuBlockGetBitmapMergeActions. The list contains only valid bitmaps in the
* sub-chain which is being processed.
*
* Note that the returned GSList contains bitmap names string pointers borrowed
* from @blockNamedNodeData so they must not be freed.
*/
static GSList *
qemuBlockGetBitmapMergeActionsGetBitmaps(virStorageSourcePtr topsrc,
const char *bitmapname,
GHashTable *blockNamedNodeData)
{
g_autoptr(GSList) ret = NULL;
qemuBlockNamedNodeDataPtr entry;
size_t i;
/* for now it doesn't make sense to consider bitmaps which are not present
* in @topsrc as we can't recreate a bitmap for a layer if it's missing */
if (!(entry = virHashLookup(blockNamedNodeData, topsrc->nodeformat)))
return NULL;
for (i = 0; i < entry->nbitmaps; i++) {
qemuBlockNamedNodeDataBitmapPtr bitmap = entry->bitmaps[i];
if (bitmapname &&
STRNEQ(bitmapname, bitmap->name))
continue;
if (!qemuBlockBitmapChainIsValid(topsrc, bitmap->name, blockNamedNodeData))
continue;
ret = g_slist_prepend(ret, bitmap->name);
}
return g_steal_pointer(&ret);
}
/**
* qemuBlockGetBitmapMergeActions:
* @topsrc: top of the chain to merge bitmaps in
* @basesrc: bottom of the chain to merge bitmaps in (NULL for full chain)
* @target: destination storage source of the merge (may be part of original chain)
* @bitmapname: name of bitmap to perform the merge (NULL for all bitmaps)
* @dstbitmapname: name of destination bitmap of the merge (see below for caveats)
* @writebitmapsrc: storage source corresponding to the node containing the write temporary bitmap
* @actions: returns actions for a 'transaction' QMP command for executing the merge
* @blockNamedNodeData: hash table filled with qemuBlockNamedNodeData
*
* Calculate handling of dirty block bitmaps between @topsrc and @basesrc. If
* @basesrc is NULL the end of the chain is considered. @target is the destination
* storage source definition of the merge and may or may not be part of the
* merged chain.
*
* Specifically the merging algorithm ensures that each considered bitmap is
* merged with the appropriate bitmaps so that it properly describes
* the state of dirty blocks when looked at from @topsrc based on the depth
* of the backing chain where the bitmap is placed.
*
* If @bitmapname is non-NULL only bitmaps with that name are handled, otherwise
* all bitmaps are considered.
*
* If @dstbitmap is non-NULL everything is merged into a bitmap with that name,
* otherwise each bitmap is merged into a bitmap with the same name into @target.
* Additionally if @dstbitmap is non-NULL the target bitmap is created as 'inactive'
* and 'transient' as a special case for the backup operation.
*
* If @writebitmapsrc is non-NULL, the 'libvirt-tmp-activewrite' bitmap from
* given node is merged along with others. This bitmap corresponds to the writes
* which occurred between an active layer job finished and the rest of the bitmap
* merging.
*
* If the bitmap is not valid somehow (see qemuBlockBitmapChainIsValid) given
* bitmap is silently skipped, so callers must ensure that given bitmap is valid
* if they care about it.
*
* The resulting 'transaction' QMP command actions are filled in and returned via
* @actions.
*
* Note that @actions may be NULL if no merging is required.
*/
int
qemuBlockGetBitmapMergeActions(virStorageSourcePtr topsrc,
virStorageSourcePtr basesrc,
virStorageSourcePtr target,
const char *bitmapname,
const char *dstbitmapname,
virStorageSourcePtr writebitmapsrc,
virJSONValuePtr *actions,
GHashTable *blockNamedNodeData)
{
g_autoptr(virJSONValue) act = virJSONValueNewArray();
virStorageSourcePtr n;
g_autoptr(GSList) bitmaps = NULL;
GSList *next;
if (!(bitmaps = qemuBlockGetBitmapMergeActionsGetBitmaps(topsrc, bitmapname,
blockNamedNodeData)))
goto done;
for (next = bitmaps; next; next = next->next) {
const char *curbitmap = next->data;
const char *mergebitmapname = dstbitmapname;
bool mergebitmappersistent = false;
bool mergebitmapdisabled = true;
g_autoptr(virJSONValue) merge = virJSONValueNewArray();
unsigned long long granularity = 0;
qemuBlockNamedNodeDataBitmapPtr bitmap;
/* explicitly named destinations mean that we want a temporary
* disabled bitmap only, so undo the default for non-explicit cases */
if (!mergebitmapname) {
mergebitmapname = curbitmap;
mergebitmappersistent = true;
mergebitmapdisabled = false;
}
for (n = topsrc; virStorageSourceIsBacking(n) && n != basesrc; n = n->backingStore) {
if (!(bitmap = qemuBlockNamedNodeDataGetBitmapByName(blockNamedNodeData,
n, curbitmap)))
continue;
if (granularity == 0)
granularity = bitmap->granularity;
if (qemuMonitorTransactionBitmapMergeSourceAddBitmap(merge,
n->nodeformat,
bitmap->name) < 0)
return -1;
}
if (dstbitmapname ||
!(bitmap = qemuBlockNamedNodeDataGetBitmapByName(blockNamedNodeData,
target, curbitmap))) {
if (qemuMonitorTransactionBitmapAdd(act,
target->nodeformat,
mergebitmapname,
mergebitmappersistent,
mergebitmapdisabled,
granularity) < 0)
return -1;
}
if (writebitmapsrc &&
qemuMonitorTransactionBitmapMergeSourceAddBitmap(merge,
writebitmapsrc->nodeformat,
"libvirt-tmp-activewrite") < 0)
return -1;
if (qemuMonitorTransactionBitmapMerge(act, target->nodeformat,
mergebitmapname, &merge) < 0)
return -1;
}
done:
if (writebitmapsrc &&
qemuMonitorTransactionBitmapRemove(act, writebitmapsrc->nodeformat,
"libvirt-tmp-activewrite") < 0)
return -1;
if (virJSONValueArraySize(act) > 0)
*actions = g_steal_pointer(&act);
return 0;
}
/**
* qemuBlockBitmapChainIsValid:
*
* Validates that the backing chain of @src contains bitmaps which libvirt will
* consider as properly corresponding to a checkpoint named @bitmapname.
*
* The bitmaps need to:
* 1) start from the top image @src
* 2) must be present in consecutive layers
* 3) all must be active, persistent and not inconsistent
*/
bool
qemuBlockBitmapChainIsValid(virStorageSourcePtr src,
const char *bitmapname,
GHashTable *blockNamedNodeData)
{
virStorageSourcePtr n;
bool found = false;
bool chain_ended = false;
for (n = src; virStorageSourceIsBacking(n); n = n->backingStore) {
qemuBlockNamedNodeDataBitmapPtr bitmap;
if (!(bitmap = qemuBlockNamedNodeDataGetBitmapByName(blockNamedNodeData,
n, bitmapname))) {
/* rule 1, must start from top */
if (!found)
return false;
chain_ended = true;
continue;
}
/* rule 2, no-gaps */
if (chain_ended)
return false;
/* rule 3 */
if (bitmap->inconsistent || !bitmap->persistent || !bitmap->recording)
return false;
found = true;
}
return found;
}
/**
* qemuBlockBitmapsHandleBlockcopy:
* @src: disk source
* @mirror: mirror source
* @blockNamedNodeData: hash table containing data about bitmaps
* @shallow: whether shallow copy is requested
* @actions: filled with arguments for a 'transaction' command
*
* Calculates which bitmaps to copy and merge during a virDomainBlockCopy job.
* This is designed to be called when the job is already synchronised as it
* may result in active bitmaps being created.
*
* Returns 0 on success and -1 on error. If @actions is NULL when 0 is returned
* there are no actions to perform for the given job.
*/
int
qemuBlockBitmapsHandleBlockcopy(virStorageSourcePtr src,
virStorageSourcePtr mirror,
GHashTable *blockNamedNodeData,
bool shallow,
virJSONValuePtr *actions)
{
virStorageSourcePtr base = NULL;
if (shallow)
base = src->backingStore;
if (qemuBlockGetBitmapMergeActions(src, base, mirror, NULL, NULL, mirror, actions,
blockNamedNodeData) < 0)
return -1;
return 0;
}
/**
* @topsrc: virStorageSource representing 'top' of the job
* @basesrc: virStorageSource representing 'base' of the job
* @active: commit job is an active layer block-commit
* @blockNamedNodeData: hash table containing data about bitmaps
* @actions: filled with arguments for a 'transaction' command
* @disabledBitmapsBase: bitmap names which were disabled
*
* Calculates the necessary bitmap merges/additions/enablements to properly
* handle commit of images from 'top' into 'base'. The necessary operations
* in the form of arguments of the 'transaction' command are filled into
* 'actions' if there is anything to do. Otherwise NULL is returned.
*/
int
qemuBlockBitmapsHandleCommitFinish(virStorageSourcePtr topsrc,
virStorageSourcePtr basesrc,
bool active,
GHashTable *blockNamedNodeData,
virJSONValuePtr *actions)
{
virStorageSourcePtr writebitmapsrc = NULL;
if (active)
writebitmapsrc = basesrc;
if (qemuBlockGetBitmapMergeActions(topsrc, basesrc, basesrc, NULL, NULL,
writebitmapsrc, actions,
blockNamedNodeData) < 0)
return -1;
return 0;
}
/**
* qemuBlockReopenFormat:
* @vm: domain object
* @src: storage source to reopen
* @asyncJob: qemu async job type
*
* Invokes the 'blockdev-reopen' command on the format layer of @src. This means
* that @src must be already properly configured for the desired outcome. The
* nodenames of @src are used to identify the specific image in qemu.
*/
static int
qemuBlockReopenFormat(virDomainObjPtr vm,
virStorageSourcePtr src,
qemuDomainAsyncJob asyncJob)
{
qemuDomainObjPrivatePtr priv = vm->privateData;
virQEMUDriverPtr driver = priv->driver;
g_autoptr(virJSONValue) reopenprops = NULL;
int rc;
/* If we are lacking the object here, qemu might have opened an image with
* a node name unknown to us */
if (!src->backingStore) {
virReportError(VIR_ERR_OPERATION_UNSUPPORTED, "%s",
_("can't reopen image with unknown presence of backing store"));
return -1;
}
if (!(reopenprops = qemuBlockStorageSourceGetBlockdevProps(src, src->backingStore)))
return -1;
if (qemuDomainObjEnterMonitorAsync(driver, vm, asyncJob) < 0)
return -1;
rc = qemuMonitorBlockdevReopen(priv->mon, &reopenprops);
if (qemuDomainObjExitMonitor(driver, vm) < 0 || rc < 0)
return -1;
return 0;
}
/**
* qemuBlockReopenReadWrite:
* @vm: domain object
* @src: storage source to reopen
* @asyncJob: qemu async job type
*
* Wrapper that reopens @src read-write. We currently depend on qemu
* reopening the storage with 'auto-read-only' enabled for us.
* After successful reopen @src's 'readonly' flag is modified. Does nothing
* if @src is already read-write.
*/
int
qemuBlockReopenReadWrite(virDomainObjPtr vm,
virStorageSourcePtr src,
qemuDomainAsyncJob asyncJob)
{
if (!src->readonly)
return 0;
src->readonly = false;
if (qemuBlockReopenFormat(vm, src, asyncJob) < 0) {
src->readonly = true;
return -1;
}
return 0;
}
/**
* qemuBlockReopenReadOnly:
* @vm: domain object
* @src: storage source to reopen
* @asyncJob: qemu async job type
*
* Wrapper that reopens @src read-only. We currently depend on qemu
* reopening the storage with 'auto-read-only' enabled for us.
* After successful reopen @src's 'readonly' flag is modified. Does nothing
* if @src is already read-only.
*/
int
qemuBlockReopenReadOnly(virDomainObjPtr vm,
virStorageSourcePtr src,
qemuDomainAsyncJob asyncJob)
{
if (src->readonly)
return 0;
src->readonly = true;
if (qemuBlockReopenFormat(vm, src, asyncJob) < 0) {
src->readonly = false;
return -1;
}
return 0;
}
/**
* qemuBlockStorageSourceNeedSliceLayer:
* @src: source to inspect
*
* Returns true if @src requires an extra 'raw' layer for handling of the storage
* slice.
*/
bool
qemuBlockStorageSourceNeedsStorageSliceLayer(const virStorageSource *src)
{
if (!src->sliceStorage)
return false;
if (src->format != VIR_STORAGE_FILE_RAW)
return true;
if (src->encryption &&
src->encryption->format == VIR_STORAGE_ENCRYPTION_FORMAT_LUKS)
return true;
return false;
}
/**
* qemuBlockStorageSourceGetCookieString:
* @src: storage source
*
* Returns a properly formatted string representing cookies of @src in format
* accepted by qemu.
*/
char *
qemuBlockStorageSourceGetCookieString(virStorageSourcePtr src)
{
g_auto(virBuffer) buf = VIR_BUFFER_INITIALIZER;
size_t i;
for (i = 0; i < src->ncookies; i++) {
virStorageNetCookieDefPtr cookie = src->cookies[i];
virBufferAsprintf(&buf, "%s=%s; ", cookie->name, cookie->value);
}
virBufferTrim(&buf, "; ");
return virBufferContentAndReset(&buf);
}
/**
* qemuBlockUpdateRelativeBacking:
* @vm: domain object
* @src: starting point of the update
* @topsrc: top level image in the backing chain (used to get security label)
*
* Reload data necessary for keeping backing store links starting from @src
* relative.
*/
int
qemuBlockUpdateRelativeBacking(virDomainObjPtr vm,
virStorageSourcePtr src,
virStorageSourcePtr topsrc)
{
qemuDomainObjPrivatePtr priv = vm->privateData;
virQEMUDriverPtr driver = priv->driver;
virStorageSourcePtr n;
for (n = src; virStorageSourceHasBacking(n); n = n->backingStore) {
int rc;
if (n->backingStore->relPath)
break;
if (!virStorageSourceSupportsBackingChainTraversal(n))
continue;
if (qemuDomainStorageFileInit(driver, vm, n, topsrc) < 0)
return -1;
rc = virStorageSourceFetchRelativeBackingPath(n, &n->backingStore->relPath);
virStorageSourceDeinit(n);
if (rc < 0)
return rc;
}
return 0;
}
virJSONValuePtr
qemuBlockExportGetNBDProps(const char *nodename,
const char *exportname,
bool writable,
const char **bitmaps)
{
g_autofree char *exportid = NULL;
g_autoptr(virJSONValue) bitmapsarr = NULL;
virJSONValuePtr ret = NULL;
exportid = g_strdup_printf("libvirt-nbd-%s", nodename);
if (bitmaps && *bitmaps) {
bitmapsarr = virJSONValueNewArray();
while (*bitmaps) {
if (virJSONValueArrayAppendString(bitmapsarr, *(bitmaps++)) < 0)
return NULL;
}
}
if (virJSONValueObjectCreate(&ret,
"s:type", "nbd",
"s:id", exportid,
"s:node-name", nodename,
"b:writable", writable,
"s:name", exportname,
"A:bitmaps", &bitmapsarr,
NULL) < 0)
return NULL;
return ret;
}
/**
* qemuBlockExportAddNBD:
* @vm: domain object
* @drivealias: (optional) alias of -drive to export in pre-blockdev configurations
* @src: disk source to export
* @exportname: name for the export
* @writable: whether the NBD export allows writes
* @bitmap: (optional) block dirty bitmap to export along
*
* This function automatically selects the proper invocation of exporting a
* block backend via NBD in qemu. This includes use of nodename for blockdev
* and proper configuration for the exportname for older qemus.
*
* This function must be called while in the monitor context.
*/
int
qemuBlockExportAddNBD(virDomainObjPtr vm,
const char *drivealias,
virStorageSourcePtr src,
const char *exportname,
bool writable,
const char *bitmap)
{
qemuDomainObjPrivatePtr priv = vm->privateData;
if (virQEMUCapsGet(priv->qemuCaps, QEMU_CAPS_BLOCKDEV)) {
if (virQEMUCapsGet(priv->qemuCaps, QEMU_CAPS_BLOCK_EXPORT_ADD)) {
g_autoptr(virJSONValue) nbdprops = NULL;
const char *bitmaps[2] = { bitmap, NULL };
if (!(nbdprops = qemuBlockExportGetNBDProps(src->nodeformat,
exportname,
writable,
bitmaps)))
return -1;
return qemuMonitorBlockExportAdd(priv->mon, &nbdprops);
} else {
return qemuMonitorNBDServerAdd(priv->mon, src->nodeformat,
exportname, writable, bitmap);
}
} else {
/* older qemu versions didn't support configuring the exportname and
* took the 'drivealias' as the export name */
return qemuMonitorNBDServerAdd(priv->mon, drivealias, NULL, writable, NULL);
}
return 0;
}
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