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
--- a/drivers/target/tcm_fc/tcm_fc.h
+++ b/drivers/target/tcm_fc/tcm_fc.h
@@ -96,7 +96,6 @@
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_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
--- a/drivers/target/tcm_fc/tfc_conf.c
+++ b/drivers/target/tcm_fc/tfc_conf.c
@@ -318,6 +318,11 @@
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 @@
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 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 @@
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 @@
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 @@
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) {
