ext2: avoid unnecessary operation in ext2_error()

If filesystem has already mounted as read-only, then we don't have
to do it again.

Signed-off-by: Chengguang Xu <cgxu519@gmx.com>
Signed-off-by: Jan Kara <jack@suse.cz>

diff --git a/fs/ext2/super.c b/fs/ext2/super.c
index cb91baa..5e2861b 100644 (file)
--- a/fs/ext2/super.c
+++ b/fs/ext2/super.c
@@ -73,7 +73,7 @@ void ext2_error(struct super_block *sb, const char *function,
 
        if (test_opt(sb, ERRORS_PANIC))
                panic("EXT2-fs: panic from previous error\n");
-       if (test_opt(sb, ERRORS_RO)) {
+       if (!sb_rdonly(sb) && test_opt(sb, ERRORS_RO)) {
                ext2_msg(sb, KERN_CRIT,
                             "error: remounting filesystem read-only");
                sb->s_flags |= SB_RDONLY;