[libvirt] [PATCH v2 07/20] qemu: Introduce virQEMUSaveData{New, Free}
Jiri Denemark
jdenemar at redhat.com
Wed Jun 7 08:37:32 UTC 2017
This is a preparation for creating a new virQEMUSaveData structure which
will encapsulate all save image header data.
Signed-off-by: Jiri Denemark <jdenemar at redhat.com>
---
Notes:
Version 2:
- new patch (separated from the original 06/15)
src/qemu/qemu_driver.c | 128 ++++++++++++++++++++++++++++++++-----------------
1 file changed, 83 insertions(+), 45 deletions(-)
diff --git a/src/qemu/qemu_driver.c b/src/qemu/qemu_driver.c
index 9d0feb268..be6bedd6a 100644
--- a/src/qemu/qemu_driver.c
+++ b/src/qemu/qemu_driver.c
@@ -2821,6 +2821,36 @@ bswap_header(virQEMUSaveHeaderPtr hdr)
}
+static void
+virQEMUSaveDataFree(virQEMUSaveHeaderPtr header)
+{
+ if (!header)
+ return;
+
+ VIR_FREE(header);
+}
+
+
+static virQEMUSaveHeaderPtr
+virQEMUSaveDataNew(char *domXML,
+ bool running,
+ int compressed)
+{
+ virQEMUSaveHeaderPtr header = NULL;
+
+ if (VIR_ALLOC(header) < 0)
+ return NULL;
+
+ memcpy(header->magic, QEMU_SAVE_PARTIAL, sizeof(header->magic));
+ header->version = QEMU_SAVE_VERSION;
+ header->was_running = running ? 1 : 0;
+ header->compressed = compressed;
+ header->data_len = strlen(domXML) + 1;
+
+ return header;
+}
+
+
/* return -errno on failure, or 0 on success */
static int
qemuDomainSaveHeader(int fd, const char *path, const char *xml,
@@ -3062,13 +3092,11 @@ qemuDomainSaveMemory(virQEMUDriverPtr driver,
virDomainObjPtr vm,
const char *path,
const char *domXML,
- int compressed,
+ virQEMUSaveHeaderPtr header,
const char *compressedpath,
- bool was_running,
unsigned int flags,
qemuDomainAsyncJob asyncJob)
{
- virQEMUSaveHeader header;
bool bypassSecurityDriver = false;
bool needUnlink = false;
int ret = -1;
@@ -3077,13 +3105,6 @@ qemuDomainSaveMemory(virQEMUDriverPtr driver,
virFileWrapperFdPtr wrapperFd = NULL;
unsigned int wrapperFlags = VIR_FILE_WRAPPER_NON_BLOCKING;
- memset(&header, 0, sizeof(header));
- memcpy(header.magic, QEMU_SAVE_PARTIAL, sizeof(header.magic));
- header.version = QEMU_SAVE_VERSION;
- header.was_running = was_running ? 1 : 0;
- header.compressed = compressed;
- header.data_len = strlen(domXML) + 1;
-
/* Obtain the file handle. */
if ((flags & VIR_DOMAIN_SAVE_BYPASS_CACHE)) {
wrapperFlags |= VIR_FILE_WRAPPER_BYPASS_CACHE;
@@ -3107,7 +3128,7 @@ qemuDomainSaveMemory(virQEMUDriverPtr driver,
goto cleanup;
/* Write header to file, followed by XML */
- if (qemuDomainSaveHeader(fd, path, domXML, &header) < 0)
+ if (qemuDomainSaveHeader(fd, path, domXML, header) < 0)
goto cleanup;
/* Perform the migration */
@@ -3131,7 +3152,7 @@ qemuDomainSaveMemory(virQEMUDriverPtr driver,
if ((fd = qemuOpenFile(driver, vm, path, O_WRONLY, NULL, NULL)) < 0)
goto cleanup;
- memcpy(header.magic, QEMU_SAVE_MAGIC, sizeof(header.magic));
+ memcpy(header->magic, QEMU_SAVE_MAGIC, sizeof(header->magic));
if (safewrite(fd, &header, sizeof(header)) != sizeof(header)) {
virReportSystemError(errno, _("unable to write %s"), path);
@@ -3172,6 +3193,7 @@ qemuDomainSaveInternal(virQEMUDriverPtr driver, virDomainPtr dom,
virObjectEventPtr event = NULL;
qemuDomainObjPrivatePtr priv = vm->privateData;
virCapsPtr caps;
+ virQEMUSaveHeaderPtr header = NULL;
if (!(caps = virQEMUDriverGetCapabilities(driver, false)))
goto cleanup;
@@ -3237,9 +3259,11 @@ qemuDomainSaveInternal(virQEMUDriverPtr driver, virDomainPtr dom,
goto endjob;
}
- ret = qemuDomainSaveMemory(driver, vm, path, xml, compressed,
- compressedpath, was_running, flags,
- QEMU_ASYNC_JOB_SAVE);
+ if (!(header = virQEMUSaveDataNew(xml, was_running, compressed)))
+ goto endjob;
+
+ ret = qemuDomainSaveMemory(driver, vm, path, xml, header, compressedpath,
+ flags, QEMU_ASYNC_JOB_SAVE);
if (ret < 0)
goto endjob;
@@ -3272,6 +3296,7 @@ qemuDomainSaveInternal(virQEMUDriverPtr driver, virDomainPtr dom,
cleanup:
VIR_FREE(xml);
+ virQEMUSaveDataFree(header);
qemuDomainEventQueue(driver, event);
virObjectUnref(caps);
return ret;
@@ -6195,7 +6220,7 @@ static int ATTRIBUTE_NONNULL(3) ATTRIBUTE_NONNULL(4)
qemuDomainSaveImageOpen(virQEMUDriverPtr driver,
const char *path,
virDomainDefPtr *ret_def,
- virQEMUSaveHeaderPtr ret_header,
+ virQEMUSaveHeaderPtr *ret_header,
char **xmlout,
bool bypass_cache,
virFileWrapperFdPtr *wrapperFd,
@@ -6203,8 +6228,8 @@ qemuDomainSaveImageOpen(virQEMUDriverPtr driver,
bool unlink_corrupt)
{
int fd = -1;
- virQEMUSaveHeader header;
char *xml = NULL;
+ virQEMUSaveHeaderPtr header = NULL;
virDomainDefPtr def = NULL;
int oflags = open_write ? O_RDWR : O_RDONLY;
virCapsPtr caps = NULL;
@@ -6229,7 +6254,10 @@ qemuDomainSaveImageOpen(virQEMUDriverPtr driver,
VIR_FILE_WRAPPER_BYPASS_CACHE)))
goto error;
- if (saferead(fd, &header, sizeof(header)) != sizeof(header)) {
+ if (VIR_ALLOC(header) < 0)
+ goto error;
+
+ if (saferead(fd, header, sizeof(*header)) != sizeof(*header)) {
if (unlink_corrupt) {
if (VIR_CLOSE(fd) < 0 || unlink(path) < 0) {
virReportSystemError(errno,
@@ -6245,11 +6273,11 @@ qemuDomainSaveImageOpen(virQEMUDriverPtr driver,
goto error;
}
- if (memcmp(header.magic, QEMU_SAVE_MAGIC, sizeof(header.magic)) != 0) {
+ if (memcmp(header->magic, QEMU_SAVE_MAGIC, sizeof(header->magic)) != 0) {
const char *msg = _("image magic is incorrect");
- if (memcmp(header.magic, QEMU_SAVE_PARTIAL,
- sizeof(header.magic)) == 0) {
+ if (memcmp(header->magic, QEMU_SAVE_PARTIAL,
+ sizeof(header->magic)) == 0) {
msg = _("save image is incomplete");
if (unlink_corrupt) {
if (VIR_CLOSE(fd) < 0 || unlink(path) < 0) {
@@ -6266,28 +6294,28 @@ qemuDomainSaveImageOpen(virQEMUDriverPtr driver,
goto error;
}
- if (header.version > QEMU_SAVE_VERSION) {
+ if (header->version > QEMU_SAVE_VERSION) {
/* convert endianess and try again */
- bswap_header(&header);
+ bswap_header(header);
}
- if (header.version > QEMU_SAVE_VERSION) {
+ if (header->version > QEMU_SAVE_VERSION) {
virReportError(VIR_ERR_OPERATION_FAILED,
_("image version is not supported (%d > %d)"),
- header.version, QEMU_SAVE_VERSION);
+ header->version, QEMU_SAVE_VERSION);
goto error;
}
- if (header.data_len <= 0) {
+ if (header->data_len <= 0) {
virReportError(VIR_ERR_OPERATION_FAILED,
- _("invalid XML length: %d"), header.data_len);
+ _("invalid XML length: %d"), header->data_len);
goto error;
}
- if (VIR_ALLOC_N(xml, header.data_len) < 0)
+ if (VIR_ALLOC_N(xml, header->data_len) < 0)
goto error;
- if (saferead(fd, xml, header.data_len) != header.data_len) {
+ if (saferead(fd, xml, header->data_len) != header->data_len) {
virReportError(VIR_ERR_OPERATION_FAILED,
"%s", _("failed to read XML"));
goto error;
@@ -6314,6 +6342,7 @@ qemuDomainSaveImageOpen(virQEMUDriverPtr driver,
error:
virDomainDefFree(def);
VIR_FREE(xml);
+ virQEMUSaveDataFree(header);
VIR_FORCE_CLOSE(fd);
virObjectUnref(caps);
@@ -6325,7 +6354,7 @@ qemuDomainSaveImageStartVM(virConnectPtr conn,
virQEMUDriverPtr driver,
virDomainObjPtr vm,
int *fd,
- const virQEMUSaveHeader *header,
+ virQEMUSaveHeaderPtr header,
const char *path,
bool start_paused,
qemuDomainAsyncJob asyncJob)
@@ -6451,7 +6480,7 @@ qemuDomainRestoreFlags(virConnectPtr conn,
const char *newxml = dxml;
int fd = -1;
int ret = -1;
- virQEMUSaveHeader header;
+ virQEMUSaveHeaderPtr header = NULL;
virFileWrapperFdPtr wrapperFd = NULL;
bool hook_taint = false;
@@ -6508,9 +6537,9 @@ qemuDomainRestoreFlags(virConnectPtr conn,
def = NULL;
if (flags & VIR_DOMAIN_SAVE_RUNNING)
- header.was_running = 1;
+ header->was_running = 1;
else if (flags & VIR_DOMAIN_SAVE_PAUSED)
- header.was_running = 0;
+ header->was_running = 0;
if (hook_taint) {
priv = vm->privateData;
@@ -6520,7 +6549,7 @@ 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, header, path,
false, QEMU_ASYNC_JOB_START);
if (virFileWrapperFdClose(wrapperFd) < 0)
VIR_WARN("Failed to close %s", path);
@@ -6531,6 +6560,7 @@ qemuDomainRestoreFlags(virConnectPtr conn,
virDomainDefFree(def);
VIR_FORCE_CLOSE(fd);
VIR_FREE(xml);
+ virQEMUSaveDataFree(header);
VIR_FREE(xmlout);
virFileWrapperFdFree(wrapperFd);
if (vm && ret < 0)
@@ -6555,7 +6585,7 @@ qemuDomainSaveImageGetXMLDesc(virConnectPtr conn, const char *path,
char *ret = NULL;
virDomainDefPtr def = NULL;
int fd = -1;
- virQEMUSaveHeader header;
+ virQEMUSaveHeaderPtr header = NULL;
/* We only take subset of virDomainDefFormat flags. */
virCheckFlags(VIR_DOMAIN_XML_SECURE, NULL);
@@ -6572,6 +6602,7 @@ qemuDomainSaveImageGetXMLDesc(virConnectPtr conn, const char *path,
ret = qemuDomainDefFormatXML(driver, def, flags);
cleanup:
+ virQEMUSaveDataFree(header);
virDomainDefFree(def);
VIR_FORCE_CLOSE(fd);
return ret;
@@ -6586,9 +6617,9 @@ qemuDomainSaveImageDefineXML(virConnectPtr conn, const char *path,
virDomainDefPtr def = NULL;
virDomainDefPtr newdef = NULL;
int fd = -1;
- virQEMUSaveHeader header;
char *xml = NULL;
size_t len;
+ virQEMUSaveHeaderPtr header = NULL;
int state = -1;
virCheckFlags(VIR_DOMAIN_SAVE_RUNNING |
@@ -6609,14 +6640,14 @@ qemuDomainSaveImageDefineXML(virConnectPtr conn, const char *path,
goto cleanup;
if (STREQ(xml, dxml) &&
- (state < 0 || state == header.was_running)) {
+ (state < 0 || state == header->was_running)) {
/* no change to the XML */
ret = 0;
goto cleanup;
}
if (state >= 0)
- header.was_running = state;
+ header->was_running = state;
if (!(newdef = qemuDomainSaveImageUpdateDef(driver, def, dxml)))
goto cleanup;
@@ -6631,12 +6662,12 @@ qemuDomainSaveImageDefineXML(virConnectPtr conn, const char *path,
goto cleanup;
len = strlen(xml) + 1;
- if (len > header.data_len) {
+ if (len > header->data_len) {
virReportError(VIR_ERR_OPERATION_FAILED, "%s",
_("new xml too large to fit in file"));
goto cleanup;
}
- if (VIR_EXPAND_N(xml, len, header.data_len - len) < 0)
+ if (VIR_EXPAND_N(xml, len, header->data_len - len) < 0)
goto cleanup;
if (lseek(fd, 0, SEEK_SET) != 0) {
@@ -6657,6 +6688,7 @@ qemuDomainSaveImageDefineXML(virConnectPtr conn, const char *path,
virDomainDefFree(newdef);
VIR_FORCE_CLOSE(fd);
VIR_FREE(xml);
+ virQEMUSaveDataFree(header);
return ret;
}
@@ -6677,7 +6709,7 @@ qemuDomainObjRestore(virConnectPtr conn,
int ret = -1;
char *xml = NULL;
char *xmlout = NULL;
- virQEMUSaveHeader header;
+ virQEMUSaveHeaderPtr header = NULL;
virFileWrapperFdPtr wrapperFd = NULL;
fd = qemuDomainSaveImageOpen(driver, path, &def, &header, &xml,
@@ -6728,13 +6760,14 @@ qemuDomainObjRestore(virConnectPtr conn,
virDomainObjAssignDef(vm, def, true, NULL);
def = NULL;
- ret = qemuDomainSaveImageStartVM(conn, driver, vm, &fd, &header, path,
+ ret = qemuDomainSaveImageStartVM(conn, driver, vm, &fd, header, path,
start_paused, asyncJob);
if (virFileWrapperFdClose(wrapperFd) < 0)
VIR_WARN("Failed to close %s", path);
cleanup:
VIR_FREE(xml);
+ virQEMUSaveDataFree(header);
VIR_FREE(xmlout);
virDomainDefFree(def);
VIR_FORCE_CLOSE(fd);
@@ -14300,6 +14333,7 @@ qemuDomainSnapshotCreateActiveExternal(virConnectPtr conn,
virQEMUDriverConfigPtr cfg = NULL;
int compressed;
char *compressedpath = NULL;
+ virQEMUSaveHeaderPtr header = NULL;
/* If quiesce was requested, then issue a freeze command, and a
* counterpart thaw command when it is actually sent to agent.
@@ -14371,9 +14405,12 @@ qemuDomainSnapshotCreateActiveExternal(virConnectPtr conn,
if (!(xml = qemuDomainDefFormatLive(driver, vm->def, true, true)))
goto cleanup;
- if ((ret = qemuDomainSaveMemory(driver, vm, snap->def->file, xml,
- compressed, compressedpath, resume,
- 0, QEMU_ASYNC_JOB_SNAPSHOT)) < 0)
+ if (!(header = virQEMUSaveDataNew(xml, resume, compressed)))
+ goto cleanup;
+
+ if ((ret = qemuDomainSaveMemory(driver, vm, snap->def->file, xml, header,
+ compressedpath, 0,
+ QEMU_ASYNC_JOB_SNAPSHOT)) < 0)
goto cleanup;
/* the memory image was created, remove it on errors */
@@ -14441,6 +14478,7 @@ qemuDomainSnapshotCreateActiveExternal(virConnectPtr conn,
ret = -1;
}
+ virQEMUSaveDataFree(header);
VIR_FREE(xml);
VIR_FREE(compressedpath);
virObjectUnref(cfg);
--
2.13.0
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