util.c: add fsync_close() helper, use where appropriate

test/hdimage.test

@@ -34,7 +34,7 @@ test_expect_success fdisk,sfdisk "hdimage" "
 	test_cmp '${testdir}/hdimage.fdisk' hdimage.fdisk &&
 	check_size images/test.hdimage-2 11539968 &&
 	sfdisk_validate images/test.hdimage-2 &&
-	check_disk_usage_range images/test.hdimage-2 61290 65376 &&
+	check_disk_usage_range images/test.hdimage-2 61290 65536 &&
 	sanitized_fdisk_sfdisk images/test.hdimage-2 > hdimage.fdisk-2 &&
 	test_cmp '${testdir}/hdimage.fdisk-2' hdimage.fdisk-2
 "

util.c

@@ -187,6 +187,19 @@ void debug(const char *fmt, ...)
 	va_end(args);
 }
 
+static int fsync_close(struct image *image, int fd)
+{
+	int a, b;
+
+	a = fsync(fd);
+	if (a)
+		image_error(image, "fsync() failed: %s\n", strerror(errno));
+	b = close(fd);
+	if (b)
+		image_error(image, "close() failed: %s\n", strerror(errno));
+	return (a || b) ? -1 : 0;
+}
+
 /*
  * printf wrapper around 'system'
  */
@@ -519,7 +532,7 @@ int prepare_image(struct image *image, unsigned long long size)
 		 * than necessary.
 		 */
 		ret = ftruncate(fd, size);
-		close(fd);
+		fsync_close(image, fd);
 		if (ret < 0) {
 			ret = -errno;
 			image_error(image, "failed to truncate %s to %lld: %s\n",
@@ -634,7 +647,7 @@ int insert_image(struct image *image, struct image *sub,
 
 out:
 	if (fd >= 0)
-		close(fd);
+		fsync_close(image, fd);
 	if (in_fd >= 0)
 		close(in_fd);
 	free(extents);
@@ -671,7 +684,7 @@ int insert_data(struct image *image, const void *_data, const char *outfile,
 		data += now;
 	}
 err_out:
-	close(outf);
+	fsync_close(image, outf);
 
 	return ret;
 }
@@ -709,7 +722,7 @@ int extend_file(struct image *image, size_t size)
 	}
 	ret = 0;
 out:
-	close(f);
+	fsync_close(image, f);
 	return ret;
 }