External/libvirt
1
0
Fork 0
mirror of https://gitlab.com/libvirt/libvirt.git synced 2024-12-27 16:15:23 +00:00
Code Issues Packages Projects Releases Wiki Activity

qemu: Introduce virQEMUSaveData structure

Browse Source 
The new structure encapsulates save image header and associated data
(domain XML).

Signed-off-by: Jiri Denemark <jdenemar@redhat.com>
Reviewed-by: Pavel Hrdina <phrdina@redhat.com>
This commit is contained in:
Jiri Denemark 2017-06-07 00:08:25 +02:00
parent 33ae270bee
commit 47e60ac306
1 changed files with 86 additions and 79 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

159
src/qemu/qemu_driver.c
View File

@ -2811,6 +2811,14 @@ struct _virQEMUSaveHeader {
uint32_t unused[15];
};
typedef struct _virQEMUSaveData virQEMUSaveData;
typedef virQEMUSaveData *virQEMUSaveDataPtr;
struct _virQEMUSaveData {
virQEMUSaveHeader header;
char *xml;
};
static inline void
bswap_header(virQEMUSaveHeaderPtr hdr)
{
@ -2822,31 +2830,39 @@ bswap_header(virQEMUSaveHeaderPtr hdr)
static void
virQEMUSaveDataFree(virQEMUSaveHeaderPtr header)
virQEMUSaveDataFree(virQEMUSaveDataPtr data)
{
if (!header)
if (!data)
return;
VIR_FREE(header);
VIR_FREE(data->xml);
VIR_FREE(data);
}
static virQEMUSaveHeaderPtr
virQEMUSaveDataNew(char *domXML ATTRIBUTE_UNUSED,
/**
* This function steals @domXML on success.
*/
static virQEMUSaveDataPtr
virQEMUSaveDataNew(char *domXML,
bool running,
int compressed)
{
virQEMUSaveHeaderPtr header = NULL;
virQEMUSaveDataPtr data = NULL;
virQEMUSaveHeaderPtr header;
if (VIR_ALLOC(header) < 0)
if (VIR_ALLOC(data) < 0)
return NULL;
VIR_STEAL_PTR(data->xml, domXML);
header = &data->header;
memcpy(header->magic, QEMU_SAVE_PARTIAL, sizeof(header->magic));
header->version = QEMU_SAVE_VERSION;
header->was_running = running ? 1 : 0;
header->compressed = compressed;
return header;
return data;
}
@ -2860,17 +2876,17 @@ virQEMUSaveDataNew(char *domXML ATTRIBUTE_UNUSED,
* Returns -1 on failure, or 0 on success.
*/
static int
virQEMUSaveDataWrite(virQEMUSaveHeaderPtr header,
const char *xml,
virQEMUSaveDataWrite(virQEMUSaveDataPtr data,
int fd,
const char *path)
{
virQEMUSaveHeaderPtr header = &data->header;
size_t len;
int ret = -1;
size_t zerosLen = 0;
char *zeros = NULL;
len = strlen(xml) + 1;
len = strlen(data->xml) + 1;
if (header->data_len > 0) {
if (len > header->data_len) {
@ -2893,7 +2909,7 @@ virQEMUSaveDataWrite(virQEMUSaveHeaderPtr header,
goto cleanup;
}
if (safewrite(fd, xml, header->data_len) != header->data_len ||
if (safewrite(fd, data->xml, header->data_len) != header->data_len ||
safewrite(fd, zeros, zerosLen) != zerosLen) {
virReportSystemError(errno,
_("failed to write domain xml to '%s'"),
@ -2910,10 +2926,12 @@ virQEMUSaveDataWrite(virQEMUSaveHeaderPtr header,
static int
virQEMUSaveDataFinish(virQEMUSaveHeaderPtr header,
virQEMUSaveDataFinish(virQEMUSaveDataPtr data,
int *fd,
const char *path)
{
virQEMUSaveHeaderPtr header = &data->header;
memcpy(header->magic, QEMU_SAVE_MAGIC, sizeof(header->magic));
if (safewrite(*fd, header, sizeof(*header)) != sizeof(*header) ||
@ -3142,8 +3160,7 @@ static int
qemuDomainSaveMemory(virQEMUDriverPtr driver,
virDomainObjPtr vm,
const char *path,
const char *domXML,
virQEMUSaveHeaderPtr header,
virQEMUSaveDataPtr data,
const char *compressedpath,
unsigned int flags,
qemuDomainAsyncJob asyncJob)
@ -3178,7 +3195,7 @@ qemuDomainSaveMemory(virQEMUDriverPtr driver,
if (!(wrapperFd = virFileWrapperFdNew(&fd, path, wrapperFlags)))
goto cleanup;
if (virQEMUSaveDataWrite(header, domXML, fd, path) < 0)
if (virQEMUSaveDataWrite(data, fd, path) < 0)
goto cleanup;
/* Perform the migration */
@ -3200,7 +3217,7 @@ qemuDomainSaveMemory(virQEMUDriverPtr driver,
goto cleanup;
if ((fd = qemuOpenFile(driver, vm, path, O_WRONLY, NULL, NULL)) < 0 ||
virQEMUSaveDataFinish(header, &fd, path) < 0)
virQEMUSaveDataFinish(data, &fd, path) < 0)
goto cleanup;
ret = 0;
@ -3232,7 +3249,7 @@ qemuDomainSaveInternal(virQEMUDriverPtr driver, virDomainPtr dom,
virObjectEventPtr event = NULL;
qemuDomainObjPrivatePtr priv = vm->privateData;
virCapsPtr caps;
virQEMUSaveHeaderPtr header = NULL;
virQEMUSaveDataPtr data = NULL;
if (!(caps = virQEMUDriverGetCapabilities(driver, false)))
goto cleanup;
@ -3298,10 +3315,11 @@ qemuDomainSaveInternal(virQEMUDriverPtr driver, virDomainPtr dom,
goto endjob;
}
if (!(header = virQEMUSaveDataNew(xml, was_running, compressed)))
if (!(data = virQEMUSaveDataNew(xml, was_running, compressed)))
goto endjob;
xml = NULL;
ret = qemuDomainSaveMemory(driver, vm, path, xml, header, compressedpath,
ret = qemuDomainSaveMemory(driver, vm, path, data, compressedpath,
flags, QEMU_ASYNC_JOB_SAVE);
if (ret < 0)
goto endjob;
@ -3335,7 +3353,7 @@ qemuDomainSaveInternal(virQEMUDriverPtr driver, virDomainPtr dom,
cleanup:
VIR_FREE(xml);
virQEMUSaveDataFree(header);
virQEMUSaveDataFree(data);
qemuDomainEventQueue(driver, event);
virObjectUnref(caps);
return ret;
@ -6244,8 +6262,7 @@ qemuDomainSaveImageUpdateDef(virQEMUDriverPtr driver,
* @driver: qemu driver data
* @path: path of the save image
* @ret_def: returns domain definition created from the XML stored in the image
* @ret_header: returns structure filled with data from the image header
* @xmlout: returns the XML from the image file (may be NULL)
* @ret_data: returns structure filled with data from the image header
* @bypass_cache: bypass cache when opening the file
* @wrapperFd: returns the file wrapper structure
* @open_write: open the file for writing (for updates)
@ -6259,16 +6276,15 @@ static int ATTRIBUTE_NONNULL(3) ATTRIBUTE_NONNULL(4)
qemuDomainSaveImageOpen(virQEMUDriverPtr driver,
const char *path,
virDomainDefPtr *ret_def,
virQEMUSaveHeaderPtr *ret_header,
char **xmlout,
virQEMUSaveDataPtr *ret_data,
bool bypass_cache,
virFileWrapperFdPtr *wrapperFd,
bool open_write,
bool unlink_corrupt)
{
int fd = -1;
char *xml = NULL;
virQEMUSaveHeaderPtr header = NULL;
virQEMUSaveDataPtr data = NULL;
virQEMUSaveHeaderPtr header;
virDomainDefPtr def = NULL;
int oflags = open_write ? O_RDWR : O_RDONLY;
virCapsPtr caps = NULL;
@ -6293,9 +6309,10 @@ qemuDomainSaveImageOpen(virQEMUDriverPtr driver,
VIR_FILE_WRAPPER_BYPASS_CACHE)))
goto error;
if (VIR_ALLOC(header) < 0)
if (VIR_ALLOC(data) < 0)
goto error;
header = &data->header;
if (saferead(fd, header, sizeof(*header)) != sizeof(*header)) {
if (unlink_corrupt) {
if (VIR_CLOSE(fd) < 0 || unlink(path) < 0) {
@ -6347,32 +6364,27 @@ qemuDomainSaveImageOpen(virQEMUDriverPtr driver,
if (header->data_len <= 0) {
virReportError(VIR_ERR_OPERATION_FAILED,
_("invalid XML length: %d"), header->data_len);
_("invalid header data length: %d"), header->data_len);
goto error;
}
if (VIR_ALLOC_N(xml, header->data_len) < 0)
if (VIR_ALLOC_N(data->xml, header->data_len) < 0)
goto error;
if (saferead(fd, xml, header->data_len) != header->data_len) {
if (saferead(fd, data->xml, header->data_len) != header->data_len) {
virReportError(VIR_ERR_OPERATION_FAILED,
"%s", _("failed to read XML"));
"%s", _("failed to read domain XML"));
goto error;
}
/* Create a domain from this XML */
if (!(def = virDomainDefParseString(xml, caps, driver->xmlopt, NULL,
if (!(def = virDomainDefParseString(data->xml, caps, driver->xmlopt, NULL,
VIR_DOMAIN_DEF_PARSE_INACTIVE |
VIR_DOMAIN_DEF_PARSE_SKIP_VALIDATE)))
goto error;
if (xmlout)
*xmlout = xml;
else
VIR_FREE(xml);
*ret_def = def;
*ret_header = header;
*ret_data = data;
virObjectUnref(caps);
@ -6380,8 +6392,7 @@ qemuDomainSaveImageOpen(virQEMUDriverPtr driver,
error:
virDomainDefFree(def);
VIR_FREE(xml);
virQEMUSaveDataFree(header);
virQEMUSaveDataFree(data);
VIR_FORCE_CLOSE(fd);
virObjectUnref(caps);
@ -6393,7 +6404,7 @@ qemuDomainSaveImageStartVM(virConnectPtr conn,
virQEMUDriverPtr driver,
virDomainObjPtr vm,
int *fd,
virQEMUSaveHeaderPtr header,
virQEMUSaveDataPtr data,
const char *path,
bool start_paused,
qemuDomainAsyncJob asyncJob)
@ -6405,6 +6416,7 @@ qemuDomainSaveImageStartVM(virConnectPtr conn,
virCommandPtr cmd = NULL;
char *errbuf = NULL;
virQEMUDriverConfigPtr cfg = virQEMUDriverGetConfig(driver);
virQEMUSaveHeaderPtr header = &data->header;
if ((header->version == 2) &&
(header->compressed != QEMU_SAVE_FORMAT_RAW)) {
@ -6514,12 +6526,11 @@ qemuDomainRestoreFlags(virConnectPtr conn,
qemuDomainObjPrivatePtr priv = NULL;
virDomainDefPtr def = NULL;
virDomainObjPtr vm = NULL;
char *xml = NULL;
char *xmlout = NULL;
const char *newxml = dxml;
int fd = -1;
int ret = -1;
virQEMUSaveHeaderPtr header = NULL;
virQEMUSaveDataPtr data = NULL;
virFileWrapperFdPtr wrapperFd = NULL;
bool hook_taint = false;
@ -6530,7 +6541,7 @@ qemuDomainRestoreFlags(virConnectPtr conn,
virNWFilterReadLockFilterUpdates();
fd = qemuDomainSaveImageOpen(driver, path, &def, &header, &xml,
fd = qemuDomainSaveImageOpen(driver, path, &def, &data,
(flags & VIR_DOMAIN_SAVE_BYPASS_CACHE) != 0,
&wrapperFd, false, false);
if (fd < 0)
@ -6546,7 +6557,7 @@ qemuDomainRestoreFlags(virConnectPtr conn,
VIR_HOOK_QEMU_OP_RESTORE,
VIR_HOOK_SUBOP_BEGIN,
NULL,
dxml ? dxml : xml,
dxml ? dxml : data->xml,
&xmlout)) < 0)
goto cleanup;
@ -6576,9 +6587,9 @@ qemuDomainRestoreFlags(virConnectPtr conn,
def = NULL;
if (flags & VIR_DOMAIN_SAVE_RUNNING)
header->was_running = 1;
data->header.was_running = 1;
else if (flags & VIR_DOMAIN_SAVE_PAUSED)
header->was_running = 0;
data->header.was_running = 0;
if (hook_taint) {
priv = vm->privateData;
@ -6588,7 +6599,7 @@ qemuDomainRestoreFlags(virConnectPtr conn,
if (qemuProcessBeginJob(driver, vm, VIR_DOMAIN_JOB_OPERATION_RESTORE) < 0)
goto cleanup;
ret = qemuDomainSaveImageStartVM(conn, driver, vm, &fd, header, path,
ret = qemuDomainSaveImageStartVM(conn, driver, vm, &fd, data, path,
false, QEMU_ASYNC_JOB_START);
if (virFileWrapperFdClose(wrapperFd) < 0)
VIR_WARN("Failed to close %s", path);
@ -6598,8 +6609,7 @@ qemuDomainRestoreFlags(virConnectPtr conn,
cleanup:
virDomainDefFree(def);
VIR_FORCE_CLOSE(fd);
VIR_FREE(xml);
virQEMUSaveDataFree(header);
virQEMUSaveDataFree(data);
VIR_FREE(xmlout);
virFileWrapperFdFree(wrapperFd);
if (vm && ret < 0)
@ -6624,12 +6634,12 @@ qemuDomainSaveImageGetXMLDesc(virConnectPtr conn, const char *path,
char *ret = NULL;
virDomainDefPtr def = NULL;
int fd = -1;
virQEMUSaveHeaderPtr header = NULL;
virQEMUSaveDataPtr data = NULL;
/* We only take subset of virDomainDefFormat flags. */
virCheckFlags(VIR_DOMAIN_XML_SECURE, NULL);
fd = qemuDomainSaveImageOpen(driver, path, &def, &header, NULL,
fd = qemuDomainSaveImageOpen(driver, path, &def, &data,
false, NULL, false, false);
if (fd < 0)
@ -6641,7 +6651,7 @@ qemuDomainSaveImageGetXMLDesc(virConnectPtr conn, const char *path,
ret = qemuDomainDefFormatXML(driver, def, flags);
cleanup:
virQEMUSaveDataFree(header);
virQEMUSaveDataFree(data);
virDomainDefFree(def);
VIR_FORCE_CLOSE(fd);
return ret;
@ -6656,8 +6666,7 @@ qemuDomainSaveImageDefineXML(virConnectPtr conn, const char *path,
virDomainDefPtr def = NULL;
virDomainDefPtr newdef = NULL;
int fd = -1;
char *xml = NULL;
virQEMUSaveHeaderPtr header = NULL;
virQEMUSaveDataPtr data = NULL;
int state = -1;
virCheckFlags(VIR_DOMAIN_SAVE_RUNNING |
@ -6668,7 +6677,7 @@ qemuDomainSaveImageDefineXML(virConnectPtr conn, const char *path,
else if (flags & VIR_DOMAIN_SAVE_PAUSED)
state = 0;
fd = qemuDomainSaveImageOpen(driver, path, &def, &header, &xml,
fd = qemuDomainSaveImageOpen(driver, path, &def, &data,
false, NULL, true, false);
if (fd < 0)
@ -6677,22 +6686,22 @@ qemuDomainSaveImageDefineXML(virConnectPtr conn, const char *path,
if (virDomainSaveImageDefineXMLEnsureACL(conn, def) < 0)
goto cleanup;
if (STREQ(xml, dxml) &&
(state < 0 || state == header->was_running)) {
if (STREQ(data->xml, dxml) &&
(state < 0 || state == data->header.was_running)) {
/* no change to the XML */
ret = 0;
goto cleanup;
}
if (state >= 0)
header->was_running = state;
data->header.was_running = state;
if (!(newdef = qemuDomainSaveImageUpdateDef(driver, def, dxml)))
goto cleanup;
VIR_FREE(xml);
VIR_FREE(data->xml);
if (!(xml = qemuDomainDefFormatXML(driver, newdef,
if (!(data->xml = qemuDomainDefFormatXML(driver, newdef,
VIR_DOMAIN_XML_INACTIVE |
VIR_DOMAIN_XML_SECURE |
VIR_DOMAIN_XML_MIGRATABLE)))
@ -6703,7 +6712,7 @@ qemuDomainSaveImageDefineXML(virConnectPtr conn, const char *path,
goto cleanup;
}
if (virQEMUSaveDataWrite(header, xml, fd, path) < 0)
if (virQEMUSaveDataWrite(data, fd, path) < 0)
goto cleanup;
if (VIR_CLOSE(fd) < 0) {
@ -6717,8 +6726,7 @@ qemuDomainSaveImageDefineXML(virConnectPtr conn, const char *path,
virDomainDefFree(def);
virDomainDefFree(newdef);
VIR_FORCE_CLOSE(fd);
VIR_FREE(xml);
virQEMUSaveDataFree(header);
virQEMUSaveDataFree(data);
return ret;
}
@ -6737,12 +6745,11 @@ qemuDomainObjRestore(virConnectPtr conn,
qemuDomainObjPrivatePtr priv = vm->privateData;
int fd = -1;
int ret = -1;
char *xml = NULL;
char *xmlout = NULL;
virQEMUSaveHeaderPtr header = NULL;
virQEMUSaveDataPtr data = NULL;
virFileWrapperFdPtr wrapperFd = NULL;
fd = qemuDomainSaveImageOpen(driver, path, &def, &header, &xml,
fd = qemuDomainSaveImageOpen(driver, path, &def, &data,
bypass_cache, &wrapperFd, false, true);
if (fd < 0) {
if (fd == -3)
@ -6756,7 +6763,7 @@ qemuDomainObjRestore(virConnectPtr conn,
if ((hookret = virHookCall(VIR_HOOK_DRIVER_QEMU, def->name,
VIR_HOOK_QEMU_OP_RESTORE,
VIR_HOOK_SUBOP_BEGIN,
NULL, xml, &xmlout)) < 0)
NULL, data->xml, &xmlout)) < 0)
goto cleanup;
if (hookret == 0 && !virStringIsEmpty(xmlout)) {
@ -6790,14 +6797,13 @@ qemuDomainObjRestore(virConnectPtr conn,
virDomainObjAssignDef(vm, def, true, NULL);
def = NULL;
ret = qemuDomainSaveImageStartVM(conn, driver, vm, &fd, header, path,
ret = qemuDomainSaveImageStartVM(conn, driver, vm, &fd, data, path,
start_paused, asyncJob);
if (virFileWrapperFdClose(wrapperFd) < 0)
VIR_WARN("Failed to close %s", path);
cleanup:
VIR_FREE(xml);
virQEMUSaveDataFree(header);
virQEMUSaveDataFree(data);
VIR_FREE(xmlout);
virDomainDefFree(def);
VIR_FORCE_CLOSE(fd);
@ -14363,7 +14369,7 @@ qemuDomainSnapshotCreateActiveExternal(virConnectPtr conn,
virQEMUDriverConfigPtr cfg = NULL;
int compressed;
char *compressedpath = NULL;
virQEMUSaveHeaderPtr header = NULL;
virQEMUSaveDataPtr data = NULL;
/* If quiesce was requested, then issue a freeze command, and a
* counterpart thaw command when it is actually sent to agent.
@ -14435,10 +14441,11 @@ qemuDomainSnapshotCreateActiveExternal(virConnectPtr conn,
if (!(xml = qemuDomainDefFormatLive(driver, vm->def, true, true)))
goto cleanup;
if (!(header = virQEMUSaveDataNew(xml, resume, compressed)))
if (!(data = virQEMUSaveDataNew(xml, resume, compressed)))
goto cleanup;
xml = NULL;
if ((ret = qemuDomainSaveMemory(driver, vm, snap->def->file, xml, header,
if ((ret = qemuDomainSaveMemory(driver, vm, snap->def->file, data,
compressedpath, 0,
QEMU_ASYNC_JOB_SNAPSHOT)) < 0)
goto cleanup;
@ -14508,7 +14515,7 @@ qemuDomainSnapshotCreateActiveExternal(virConnectPtr conn,
ret = -1;
}
virQEMUSaveDataFree(header);
virQEMUSaveDataFree(data);
VIR_FREE(xml);
VIR_FREE(compressedpath);
virObjectUnref(cfg);