+ if (fstat(fd, &st) == 0 && S_ISBLK(st.st_mode)) {
+ char pathname[sizeof("/sys/dev/block/4294967295:4294967295/start")];
+ FILE *fp;
+
+ snprintf(pathname, sizeof(pathname), "/sys/dev/block/%u:%u/start",
+ major(st.st_rdev), minor(st.st_rdev));
+ fp = fopen(pathname, "r");
+ if (fp != NULL) {
+ if (fscanf(fp, "%llu", &blk_dev_offset) == 1) {
+ /*
+ * Linux kernel always reports partition offset
+ * in 512-byte units, regardless of sector size
+ */
+ blk_dev_offset <<= 9;
+ }
+ fclose(fp);
+ }
+ }
+