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target: Add se_sess->sess_kref + get/put helpers

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This patch adds basic se_session->sess_kref and get/put helpers for fabric
session reference counting.  It sets the initial kref in transport_init_session()
and adds a target_release_session() callback to invoke TFO->close_session()
for final session shutdown.

Cc: Roland Dreier <roland@purestorage.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Joern Engel <joern@logfs.org>
Cc: Andy Grover <agrover@redhat.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
This commit is contained in:
Nicholas Bellinger 2012-02-26 22:22:10 -08:00
parent 140854cb72
commit 41ac82b668
3 changed files with 25 additions and 0 deletions
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22
drivers/target/target_core_transport.c
View file

@ -246,6 +246,7 @@ struct se_session *transport_init_session(void)
INIT_LIST_HEAD(&se_sess->sess_cmd_list);
INIT_LIST_HEAD(&se_sess->sess_wait_list);
spin_lock_init(&se_sess->sess_cmd_lock);
kref_init(&se_sess->sess_kref);
return se_sess;
}
@ -313,6 +314,27 @@ void transport_register_session(
}
EXPORT_SYMBOL(transport_register_session);
static void target_release_session(struct kref *kref)
{
struct se_session *se_sess = container_of(kref,
struct se_session, sess_kref);
struct se_portal_group *se_tpg = se_sess->se_tpg;
se_tpg->se_tpg_tfo->close_session(se_sess);
}
void target_get_session(struct se_session *se_sess)
{
kref_get(&se_sess->sess_kref);
}
EXPORT_SYMBOL(target_get_session);
int target_put_session(struct se_session *se_sess)
{
return kref_put(&se_sess->sess_kref, target_release_session);
}
EXPORT_SYMBOL(target_put_session);
void transport_deregister_session_configfs(struct se_session *se_sess)
{
struct se_node_acl *se_nacl;

1
include/target/target_core_base.h
View file

@ -654,6 +654,7 @@ struct se_session {
struct list_head sess_cmd_list;
struct list_head sess_wait_list;
spinlock_t sess_cmd_lock;
struct kref sess_kref;
};
struct se_device;

2
include/target/target_core_fabric.h
View file

@ -105,6 +105,8 @@ void __transport_register_session(struct se_portal_group *,
struct se_node_acl *, struct se_session *, void *);
void transport_register_session(struct se_portal_group *,
struct se_node_acl *, struct se_session *, void *);
void target_get_session(struct se_session *);
int target_put_session(struct se_session *);
void transport_free_session(struct se_session *);
void transport_deregister_session_configfs(struct se_session *);
void transport_deregister_session(struct se_session *);