target_core_alua: Make supported states configurable

Signed-off-by: Hannes Reinecke <hare@suse.de>

diff --git a/drivers/target/target_core_configfs.c b/drivers/target/target_core_configfs.c
index 3a964fbf50ee6c40a96f03a688e36e46f71be9d1..1e4ea288303a84c81c28804dd4cbabf4eea1a64d 100644 (file)
--- a/drivers/target/target_core_configfs.c
+++ b/drivers/target/target_core_configfs.c
@@ -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,