diff -Naur busybox-1.20.2/include/bb_e2fs_defs.h busybox-1.20.2-magellan/include/bb_e2fs_defs.h
--- busybox-1.20.2/include/bb_e2fs_defs.h	2012-07-26 13:47:27.793982664 +0200
+++ busybox-1.20.2-magellan/include/bb_e2fs_defs.h	2012-07-26 13:49:41.547984639 +0200
@@ -406,14 +406,14 @@
 	 * Performance hints.  Directory preallocation should only
 	 * happen if the EXT2_FEATURE_COMPAT_DIR_PREALLOC flag is on.
 	 */
-	uint8_t	s_prealloc_blocks;	/* Nr of blocks to try to preallocate*/
-	uint8_t	s_prealloc_dir_blocks;	/* Nr to preallocate for dirs */
+	uint8_t		s_prealloc_blocks;	/* Nr of blocks to try to preallocate*/
+	uint8_t		s_prealloc_dir_blocks;	/* Nr to preallocate for dirs */
 	uint16_t	s_reserved_gdt_blocks;	/* Per group table for online growth */
 	/*
 	 * Journaling support valid if EXT2_FEATURE_COMPAT_HAS_JOURNAL set.
 	 */
-	uint8_t		s_journal_uuid[16];	/* uuid of journal superblock */
-	uint32_t	s_journal_inum;		/* inode number of journal file */
+/*D0*/	uint8_t		s_journal_uuid[16];	/* uuid of journal superblock */
+/*E0*/	uint32_t	s_journal_inum;		/* inode number of journal file */
 	uint32_t	s_journal_dev;		/* device number of journal file */
 	uint32_t	s_last_orphan;		/* start of list of inodes to delete */
 	uint32_t	s_hash_seed[4];		/* HTREE hash seed */
@@ -421,6 +421,7 @@
 	uint8_t		s_jnl_backup_type;	/* Default type of journal backup */
 	uint16_t	s_reserved_word_pad;
 	uint32_t	s_default_mount_opts;
+/*100*/	uint32_t	s_default_mount_opts;
 	uint32_t	s_first_meta_bg;	/* First metablock group */
 	/* ext3 additions */
 	uint32_t	s_mkfs_time;		/* When the filesystem was created */
diff -Naur busybox-1.20.2/testsuite/mount.tests busybox-1.20.2-magellan/testsuite/mount.tests
--- busybox-1.20.2/testsuite/mount.tests	2012-07-02 16:08:25.000000000 +0200
+++ busybox-1.20.2-magellan/testsuite/mount.tests	2012-07-26 13:51:14.692982608 +0200
@@ -36,7 +36,8 @@
 "mount -o loop mount.image1m $testdir "\
 "&& grep -Fc $testdir </proc/mounts "\
 "&& mount -o remount,mand $testdir "\
-"&& grep -F $testdir </proc/mounts | grep -c '[, ]mand[, ]'" \
+"&& grep -F $testdir </proc/mounts | grep -c '[, ]mand[, ]'"\
+"|| grep -F $testdir </proc/mounts" \
 	"1\n""1\n" \
 	"" ""
 
@@ -83,4 +84,28 @@
 	"" ""
 SKIP=
 
+
+testing "mount RO loop" "\
+exec 2>&1
+umount -d mount.dir 2>/dev/null
+rmdir mount.dir     2>/dev/null
+mkdir -p mount.dir
+(
+cd mount.dir                               || { echo 'cd error'; exit 1; }
+mkdir z1 z2                                || { echo 'mkdir error'; exit 1; }
+mount -t tmpfs tmpfs z1                    || { echo 'mount tmpfs error'; exit 1; }
+dd if=/dev/zero of=z1/e2img count=10 bs=1M 2>/dev/null || { echo 'dd error'; exit 1; }
+mke2fs -F z1/e2img                         2>/dev/null >&2 || { echo 'mke2fs error'; exit 1; }
+mount -r -o loop -t ext2 z1/e2img z2       || { echo 'mount -r -o loop error'; exit 1; }
+mount -o remount,ro z1                     || { echo 'mount -o remount,ro error'; exit 1; }
+)
+umount -d mount.dir/z2
+##losetup -d /dev/loop*
+umount -d mount.dir/z1
+rm -rf mount.dir
+echo DONE
+" \
+"DONE\n" "" ""
+
+
 exit $FAILCOUNT