sysfs_printf
sysfs_printf(data_csum, "%i", dc->disk.data_csum);
sysfs_printf(io_errors, "%i", atomic_read(&dc->io_errors));
sysfs_printf(io_error_limit, "%i", dc->error_limit);
sysfs_printf(io_disable, "%i", dc->io_disable);
sysfs_printf(data_csum, "%i", d->data_csum);
sysfs_printf(verify, "%i", c->verify);
sysfs_printf(key_merging_disabled, "%i", c->key_merging_disabled);
sysfs_printf(expensive_debug_checks,
sysfs_printf(gc_always_rewrite, "%i", c->gc_always_rewrite);
sysfs_printf(btree_shrinker_disabled, "%i", c->shrinker_disabled);
sysfs_printf(copy_gc_enabled, "%i", c->copy_gc_enabled);
sysfs_printf(idle_max_writeback_rate, "%i",
sysfs_printf(gc_after_writeback, "%i", c->gc_after_writeback);
sysfs_printf(io_disable, "%i",
#define var_printf(_var, fmt) sysfs_printf(_var, fmt, var(_var))