target_core_alua: Make supported states configurable (6be526c4) · Commits · e / devices / android_kernel_samsung_exynos9810

drivers/target/target_core_configfs.c

+50 −0

Original line number	Diff line number	Diff line
		@@ -2130,6 +2130,55 @@ static ssize_t target_core_alua_tg_pt_gp_store_attr_alua_access_type(

		SE_DEV_ALUA_TG_PT_ATTR(alua_access_type, S_IRUGO \| S_IWUSR);

		/*
		* alua_supported_states
		*/
		static ssize_t target_core_alua_tg_pt_gp_show_attr_alua_supported_states(
		struct t10_alua_tg_pt_gp *tg_pt_gp,
		char *page)
		{
		return sprintf(page, "%02x\n",
		tg_pt_gp->tg_pt_gp_alua_supported_states);
		}

		static ssize_t target_core_alua_tg_pt_gp_store_attr_alua_supported_states(
		struct t10_alua_tg_pt_gp *tg_pt_gp,
		const char *page,
		size_t count)
		{
		unsigned long tmp;
		int new_states, valid_states, ret;

		if (!tg_pt_gp->tg_pt_gp_valid_id) {
		pr_err("Unable to do set supported ALUA states on non"
		" valid tg_pt_gp ID: %hu\n",
		tg_pt_gp->tg_pt_gp_valid_id);
		return -EINVAL;
		}

		ret = strict_strtoul(page, 0, &tmp);
		if (ret < 0) {
		pr_err("Unable to extract new supported ALUA states"
		" from %s\n", page);
		return -EINVAL;
		}
		new_states = (int)tmp;
		valid_states = ALUA_T_SUP \| ALUA_O_SUP \| ALUA_LBD_SUP \| \
		ALUA_U_SUP \| ALUA_S_SUP \| ALUA_AN_SUP \| ALUA_AO_SUP;


		if (new_states & ~valid_states) {
		pr_err("Illegal supported ALUA states: 0x%02x\n",
		new_states);
		return -EINVAL;
		}

		tg_pt_gp->tg_pt_gp_alua_supported_states = new_states;
		return count;
		}

		SE_DEV_ALUA_TG_PT_ATTR(alua_supported_states, S_IRUGO \| S_IWUSR);

		/*
		* alua_write_metadata
		*/
		@@ -2350,6 +2399,7 @@ static struct configfs_attribute *target_core_alua_tg_pt_gp_attrs[] = {
		&target_core_alua_tg_pt_gp_alua_access_state.attr,
		&target_core_alua_tg_pt_gp_alua_access_status.attr,
		&target_core_alua_tg_pt_gp_alua_access_type.attr,
		&target_core_alua_tg_pt_gp_alua_supported_states.attr,
		&target_core_alua_tg_pt_gp_alua_write_metadata.attr,
		&target_core_alua_tg_pt_gp_nonop_delay_msecs.attr,
		&target_core_alua_tg_pt_gp_trans_delay_msecs.attr,