1 files changed, 3 insertions, 0 deletions

diff --git a/fs/hfs/mdb.c b/fs/hfs/mdb.c
index 7a3224049f30..5fd51a5833ff 100644
--- a/fs/hfs/mdb.c
+++ b/fs/hfs/mdb.c
@@ -260,6 +260,9 @@ void hfs_mdb_commit(struct super_block *sb)
 {
         struct hfs_mdb *mdb = HFS_SB(sb)->mdb;
 
+        if (sb->s_flags & MS_RDONLY)
+                return;
+
         lock_buffer(HFS_SB(sb)->mdb_bh);
         if (test_and_clear_bit(HFS_FLG_MDB_DIRTY, &HFS_SB(sb)->flags)) {
                 /* These parameters may have been modified, so write them back */