btrfs: add missing bytes_readonly attribute file in sysfs
Signed-off-by: NWang Xiaoguang <wangxg.fnst@cn.fujitsu.com> Signed-off-by: NDavid Sterba <dsterba@suse.com>
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Signed-off-by: NWang Xiaoguang <wangxg.fnst@cn.fujitsu.com> Signed-off-by: NDavid Sterba <dsterba@suse.com>