CEPH_I_FLUSH_SNAPS_BIT
clear_bit(CEPH_I_FLUSH_SNAPS_BIT, &ci->i_ceph_flags);
set_bit(CEPH_I_FLUSH_SNAPS_BIT, &ci->i_ceph_flags);
set_bit(CEPH_I_FLUSH_SNAPS_BIT, &ci->i_ceph_flags);
set_bit(CEPH_I_FLUSH_SNAPS_BIT, &ci->i_ceph_flags);
#define CEPH_I_FLUSH_SNAPS (1 << CEPH_I_FLUSH_SNAPS_BIT)