+
+/* used only for compatibility with old on-disk cfg_marker data */
+struct cfg_marker32 {
+ __u32 cm_step;
+ __u32 cm_flags;
+ __u32 cm_vers;
+ __u32 padding;
+ __u32 cm_createtime;
+ __u32 cm_canceltime;
+ char cm_tgtname[MTI_NAME_MAXLEN];
+ char cm_comment[MTI_NAME_MAXLEN];
+};
+
+#define MTI_NAMELEN32 (MTI_NAME_MAXLEN - \
+ (sizeof(struct cfg_marker) - sizeof(struct cfg_marker32)))
+
+void lustre_swab_cfg_marker(struct cfg_marker *marker, int swab, int size)
+{
+ struct cfg_marker32 *cm32 = (struct cfg_marker32*)marker;
+ ENTRY;
+
+ if (swab) {
+ __swab32s(&marker->cm_step);
+ __swab32s(&marker->cm_flags);
+ __swab32s(&marker->cm_vers);
+ }
+ if (size == sizeof(*cm32)) {
+ __u32 createtime, canceltime;
+ /* There was a problem with the original declaration of
+ * cfg_marker on 32-bit systems because it used time_t as
+ * a wire protocol structure, and didn't verify this in
+ * wirecheck. We now have to convert the offsets of the
+ * later fields in order to work on 32- and 64-bit systems.
+ *
+ * Fortunately, the cm_comment field has no functional use
+ * so can be sacrificed when converting the timestamp size.
+ *
+ * Overwrite fields from the end first, so they are not
+ * clobbered, and use memmove() instead of memcpy() because
+ * the source and target buffers overlap. bug 16771 */
+ createtime = cm32->cm_createtime;
+ canceltime = cm32->cm_canceltime;
+ memmove(marker->cm_comment, cm32->cm_comment, MTI_NAMELEN32);
+ marker->cm_comment[MTI_NAMELEN32 - 1] = '\0';
+ memmove(marker->cm_tgtname, cm32->cm_tgtname,
+ sizeof(marker->cm_tgtname));
+ if (swab) {
+ __swab32s(&createtime);
+ __swab32s(&canceltime);
+ }
+ marker->cm_createtime = createtime;
+ marker->cm_canceltime = canceltime;
+ CDEBUG(D_CONFIG, "Find old cfg_marker(Srv32b,Clt64b) "
+ "for target %s, converting\n",
+ marker->cm_tgtname);
+ } else if (swab) {
+ __swab64s(&marker->cm_createtime);
+ __swab64s(&marker->cm_canceltime);
+ }
+
+ EXIT;
+ return;
+}
+EXPORT_SYMBOL(lustre_swab_cfg_marker);