qemu: Rename xml_len in virQEMUSaveHeader as data_len

Since virQEMUSaveHeader will be followed by more than just domain XML,
the old name would be confusing as it was designed to describe the
length of all data following the save image header.
Signed-off-by: NJiri Denemark <jdenemar@redhat.com>
Reviewed-by: NPavel Hrdina <phrdina@redhat.com>

src/qemu/qemu_driver.c

@@ -2805,7 +2805,7 @@ typedef virQEMUSaveHeader *virQEMUSaveHeaderPtr;
 struct _virQEMUSaveHeader {
     char magic[sizeof(QEMU_SAVE_MAGIC)-1];
     uint32_t version;
-    uint32_t xml_len;
+    uint32_t data_len;
     uint32_t was_running;
     uint32_t compressed;
     uint32_t unused[15];
@@ -2815,7 +2815,7 @@ static inline void
 bswap_header(virQEMUSaveHeaderPtr hdr)
 {
     hdr->version = bswap_32(hdr->version);
-    hdr->xml_len = bswap_32(hdr->xml_len);
+    hdr->data_len = bswap_32(hdr->data_len);
     hdr->was_running = bswap_32(hdr->was_running);
     hdr->compressed = bswap_32(hdr->compressed);
 }
@@ -2836,7 +2836,7 @@ qemuDomainSaveHeader(int fd, const char *path, const char *xml,
         goto endjob;
     }
 
-    if (safewrite(fd, xml, header->xml_len) != header->xml_len) {
+    if (safewrite(fd, xml, header->data_len) != header->data_len) {
         ret = -errno;
         virReportError(VIR_ERR_OPERATION_FAILED,
                        _("failed to write xml to '%s'"), path);
@@ -3082,7 +3082,7 @@ qemuDomainSaveMemory(virQEMUDriverPtr driver,
     header.version = QEMU_SAVE_VERSION;
     header.was_running = was_running ? 1 : 0;
     header.compressed = compressed;
-    header.xml_len = strlen(domXML) + 1;
+    header.data_len = strlen(domXML) + 1;
 
     /* Obtain the file handle.  */
     if ((flags & VIR_DOMAIN_SAVE_BYPASS_CACHE)) {
@@ -6276,16 +6276,16 @@ qemuDomainSaveImageOpen(virQEMUDriverPtr driver,
         goto error;
     }
 
-    if (header.xml_len <= 0) {
+    if (header.data_len <= 0) {
         virReportError(VIR_ERR_OPERATION_FAILED,
-                       _("invalid XML length: %d"), header.xml_len);
+                       _("invalid XML length: %d"), header.data_len);
         goto error;
     }
 
-    if (VIR_ALLOC_N(xml, header.xml_len) < 0)
+    if (VIR_ALLOC_N(xml, header.data_len) < 0)
         goto error;
 
-    if (saferead(fd, xml, header.xml_len) != header.xml_len) {
+    if (saferead(fd, xml, header.data_len) != header.data_len) {
         virReportError(VIR_ERR_OPERATION_FAILED,
                        "%s", _("failed to read XML"));
         goto error;
@@ -6629,12 +6629,12 @@ qemuDomainSaveImageDefineXML(virConnectPtr conn, const char *path,
         goto cleanup;
     len = strlen(xml) + 1;
 
-    if (len > header.xml_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.xml_len - len) < 0)
+    if (VIR_EXPAND_N(xml, len, header.data_len - len) < 0)
         goto cleanup;
 
     if (lseek(fd, 0, SEEK_SET) != 0) {