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target: consolidate and fix session shutdown

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Factor out a helper to shutdown sessions for a Node ACL, and make it
properly restart the list walk after dropping the lock.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
This commit is contained in:
Christoph Hellwig 2016-05-02 15:45:19 +02:00 committed by Nicholas Bellinger
parent 9730ffcb89
commit bc6e6bb470
1 changed files with 35 additions and 56 deletions
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91
drivers/target/target_core_tpg.c
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@ -336,44 +336,47 @@ struct se_node_acl *core_tpg_add_initiator_node_acl(
return acl;
}
static void target_shutdown_sessions(struct se_node_acl *acl, bool acl_stop)
{
struct se_session *sess;
unsigned long flags;
int ret;
spin_lock_irqsave(&acl->nacl_sess_lock, flags);
if (acl_stop)
acl->acl_stop = 1;
restart:
list_for_each_entry(sess, &acl->acl_sess_list, sess_acl_list) {
if (sess->sess_tearing_down)
continue;
if (!target_get_session(sess))
continue;
list_del(&sess->sess_acl_list);
spin_unlock_irqrestore(&acl->nacl_sess_lock, flags);
ret = acl->se_tpg->se_tpg_tfo->shutdown_session(sess);
target_put_session(sess);
if (ret)
target_put_session(sess);
spin_lock_irqsave(&acl->nacl_sess_lock, flags);
goto restart;
}
spin_unlock_irqrestore(&acl->nacl_sess_lock, flags);
}
void core_tpg_del_initiator_node_acl(struct se_node_acl *acl)
{
struct se_portal_group *tpg = acl->se_tpg;
LIST_HEAD(sess_list);
struct se_session *sess, *sess_tmp;
unsigned long flags;
int rc;
mutex_lock(&tpg->acl_node_mutex);
if (acl->dynamic_node_acl) {
if (acl->dynamic_node_acl)
acl->dynamic_node_acl = 0;
}
list_del(&acl->acl_list);
mutex_unlock(&tpg->acl_node_mutex);
spin_lock_irqsave(&acl->nacl_sess_lock, flags);
acl->acl_stop = 1;
target_shutdown_sessions(acl, true);
list_for_each_entry_safe(sess, sess_tmp, &acl->acl_sess_list,
sess_acl_list) {
if (sess->sess_tearing_down != 0)
continue;
if (!target_get_session(sess))
continue;
list_move(&sess->sess_acl_list, &sess_list);
}
spin_unlock_irqrestore(&acl->nacl_sess_lock, flags);
list_for_each_entry_safe(sess, sess_tmp, &sess_list, sess_acl_list) {
list_del(&sess->sess_acl_list);
rc = tpg->se_tpg_tfo->shutdown_session(sess);
target_put_session(sess);
if (!rc)
continue;
target_put_session(sess);
}
target_put_nacl(acl);
/*
* Wait for last target_put_nacl() to complete in target_complete_nacl()
@ -400,11 +403,7 @@ int core_tpg_set_initiator_node_queue_depth(
struct se_node_acl *acl,
u32 queue_depth)
{
LIST_HEAD(sess_list);
struct se_portal_group *tpg = acl->se_tpg;
struct se_session *sess, *sess_tmp;
unsigned long flags;
int rc;
/*
* User has requested to change the queue depth for a Initiator Node.
@ -413,30 +412,10 @@ int core_tpg_set_initiator_node_queue_depth(
*/
target_set_nacl_queue_depth(tpg, acl, queue_depth);
spin_lock_irqsave(&acl->nacl_sess_lock, flags);
list_for_each_entry_safe(sess, sess_tmp, &acl->acl_sess_list,
sess_acl_list) {
if (sess->sess_tearing_down != 0)
continue;
if (!target_get_session(sess))
continue;
spin_unlock_irqrestore(&acl->nacl_sess_lock, flags);
/*
* Finally call tpg->se_tpg_tfo->close_session() to force session
* reinstatement to occur if there is an active session for the
* $FABRIC_MOD Initiator Node in question.
*/
rc = tpg->se_tpg_tfo->shutdown_session(sess);
target_put_session(sess);
if (!rc) {
spin_lock_irqsave(&acl->nacl_sess_lock, flags);
continue;
}
target_put_session(sess);
spin_lock_irqsave(&acl->nacl_sess_lock, flags);
}
spin_unlock_irqrestore(&acl->nacl_sess_lock, flags);
/*
* Shutdown all pending sessions to force session reinstatement.
*/
target_shutdown_sessions(acl, false);
pr_debug("Successfully changed queue depth to: %d for Initiator"
" Node: %s on %s Target Portal Group: %u\n", acl->queue_depth,