BM_LOCKED_MASK
WARN_ON(!(BM_LOCKED_MASK & b->bm_flags));
if (BM_LOCKED_MASK & b->bm_flags)
b->bm_flags |= flags & BM_LOCKED_MASK;
if (!(BM_LOCKED_MASK & device->bitmap->bm_flags))
b->bm_flags &= ~BM_LOCKED_MASK;
drbd_bm_lock(device, "resize", BM_LOCKED_MASK);
"size changed", BM_LOCKED_MASK, NULL);
"set_n_write from attaching", BM_LOCKED_MASK,
"read from attaching", BM_LOCKED_MASK,
"set_n_write from invalidate", BM_LOCKED_MASK, NULL))
"clear_n_write from new_c_uuid", BM_LOCKED_MASK, NULL);