target/tcm_fc: Limit to 1 TPG per wwn

tcm_fc doesn't support multiple TPGs per wwn. For proof, see
ft_lport_find_tpg. Enforce this in the code.

Replace ft_lport_wwn.tpg_list with a single pointer. We can't fold ft_tpg
into ft_lport_wwn because they can have different lifetimes.

Signed-off-by: Andy Grover <agrover@redhat.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>

diff --git a/drivers/target/tcm_fc/tcm_fc.h b/drivers/target/tcm_fc/tcm_fc.h
index aba6861..7290f8f 100644 (file)
--- a/drivers/target/tcm_fc/tcm_fc.h
+++ b/drivers/target/tcm_fc/tcm_fc.h
@@ -96,7 +96,6 @@ struct ft_tpg {
        u32 index;
        struct ft_lport_acl *lport_acl;
        struct ft_tport *tport;         /* active tport or NULL */
-       struct list_head list;          /* linkage in ft_lport_acl tpg_list */
        struct list_head lun_list;      /* head of LUNs */
        struct se_portal_group se_tpg;
        struct workqueue_struct *workqueue;
@@ -105,8 +104,8 @@ struct ft_tpg {
 struct ft_lport_acl {
        u64 wwpn;
        char name[FT_NAMELEN];
+       struct ft_tpg *tpg;
        struct list_head list;
-       struct list_head tpg_list;
        struct se_wwn fc_lport_wwn;
 };
 

diff --git a/drivers/target/tcm_fc/tfc_conf.c b/drivers/target/tcm_fc/tfc_conf.c
index 9c2da1f..ccfa328 100644 (file)
--- a/drivers/target/tcm_fc/tfc_conf.c
+++ b/drivers/target/tcm_fc/tfc_conf.c
@@ -318,6 +318,11 @@ static struct se_portal_group *ft_add_tpg(
        if (index > UINT_MAX)
                return NULL;
 
+       if ((index != 1)) {
+               pr_err("Error, a single TPG=1 is used for HW port mappings\n");
+               return ERR_PTR(-ENOSYS);
+       }
+
        lacl = container_of(wwn, struct ft_lport_acl, fc_lport_wwn);
        tpg = kzalloc(sizeof(*tpg), GFP_KERNEL);
        if (!tpg)
@@ -342,7 +347,7 @@ static struct se_portal_group *ft_add_tpg(
        tpg->workqueue = wq;
 
        mutex_lock(&ft_lport_lock);
-       list_add_tail(&tpg->list, &lacl->tpg_list);
+       lacl->tpg = tpg;
        mutex_unlock(&ft_lport_lock);
 
        return &tpg->se_tpg;
@@ -351,6 +356,7 @@ static struct se_portal_group *ft_add_tpg(
 static void ft_del_tpg(struct se_portal_group *se_tpg)
 {
        struct ft_tpg *tpg = container_of(se_tpg, struct ft_tpg, se_tpg);
+       struct ft_lport_acl *lacl = tpg->lport_acl;
 
        pr_debug("del tpg %s\n",
                    config_item_name(&tpg->se_tpg.tpg_group.cg_item));
@@ -361,7 +367,8 @@ static void ft_del_tpg(struct se_portal_group *se_tpg)
        synchronize_rcu();
 
        mutex_lock(&ft_lport_lock);
-       list_del(&tpg->list);
+       lacl->tpg = NULL;
+
        if (tpg->tport) {
                tpg->tport->tpg = NULL;
                tpg->tport = NULL;
@@ -381,14 +388,10 @@ static void ft_del_tpg(struct se_portal_group *se_tpg)
 struct ft_tpg *ft_lport_find_tpg(struct fc_lport *lport)
 {
        struct ft_lport_acl *lacl;
-       struct ft_tpg *tpg;
 
        list_for_each_entry(lacl, &ft_lport_list, list) {
-               if (lacl->wwpn == lport->wwpn) {
-                       list_for_each_entry(tpg, &lacl->tpg_list, list)
-                               return tpg; /* XXX for now return first entry */
-                       return NULL;
-               }
+               if (lacl->wwpn == lport->wwpn)
+                       return lacl->tpg;
        }
        return NULL;
 }
@@ -417,7 +420,6 @@ static struct se_wwn *ft_add_lport(
        if (!lacl)
                return NULL;
        lacl->wwpn = wwpn;
-       INIT_LIST_HEAD(&lacl->tpg_list);
 
        mutex_lock(&ft_lport_lock);
        list_for_each_entry(old_lacl, &ft_lport_list, list) {