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target/tcm_fc: Limit to 1 TPG per wwn

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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>
This commit is contained in:
Andy Grover 2014-04-04 16:54:12 -07:00 committed by Nicholas Bellinger
parent b295e76900
commit d242c1d7d3
2 changed files with 12 additions and 11 deletions
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3
drivers/target/tcm_fc/tcm_fc.h
View File

@ -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;
};

20
drivers/target/tcm_fc/tfc_conf.c
View File

@ -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) {