4.5-stable review patch. If anyone has any objections, please let me know.
------------------ From: David Sterba <[email protected]> commit ee6111386a1b304f8bf589d36810d53e3b27ee20 upstream. We don't want to trigger the change on a read-only filesystem, similar to what the label handler does. Signed-off-by: David Sterba <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]> --- fs/btrfs/sysfs.c | 3 +++ 1 file changed, 3 insertions(+) --- a/fs/btrfs/sysfs.c +++ b/fs/btrfs/sysfs.c @@ -120,6 +120,9 @@ static ssize_t btrfs_feature_attr_store( if (!fs_info) return -EPERM; + if (fs_info->sb->s_flags & MS_RDONLY) + return -EROFS; + ret = kstrtoul(skip_spaces(buf), 0, &val); if (ret) return ret;
