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Date: Sun, 14 Mar 2010 01:17:45 -0800
From: "Nicholas A. Bellinger" <nab@...ux-iscsi.org>
To: linux-kernel <linux-kernel@...r.kernel.org>,
linux-scsi <linux-scsi@...r.kernel.org>,
LIO-Target devel <linux-iscsi-target-dev@...glegroups.com>,
Douglas Gilbert <dgilbert@...erlog.com>,
"Martin K. Petersen" <martin.petersen@...cle.com>,
FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>,
Mike Christie <michaelc@...wisc.edu>,
Hannes Reinecke <hare@...e.de>,
Joe Eykholt <jeykholt@...co.com>,
James Bottomley <James.Bottomley@...e.de>
Cc: Nicholas Bellinger <nab@...ux-iscsi.org>
Subject: [PATCH 1/3] [TCM/PR]: Add TPG, NodeACL and MappedLUN wrappers for configfs_[un]depend_item()
From: Nicholas Bellinger <nab@...ux-iscsi.org>
This patch adds TPG, NodeACL and MappedLUN wrappers for configfs_depend_item() and
configfs_undepend_item() to properly handler the reference counting of *pr_ref_count
during multi-fabric SPEC_I_PT=1 TransportID and REGISTER_AND_MOVE processing.
For the NodeACL and MappedLUN wrappers, there is also logic to handle the
NAF_DYNAMIC_NODE_ACL case so that demo-mode (eg: no explict node ACLs) works for
SPEC_I_PT=1 TransportID and REGISTER_AND_MOVE as well.
Signed-off-by: Nicholas A. Bellinger <nab@...ux-iscsi.org>
---
drivers/target/target_core_pr.c | 85 +++++++++++++++++++++++++++++++++++++++
1 files changed, 85 insertions(+), 0 deletions(-)
diff --git a/drivers/target/target_core_pr.c b/drivers/target/target_core_pr.c
index 5b23767..03f40e3 100644
--- a/drivers/target/target_core_pr.c
+++ b/drivers/target/target_core_pr.c
@@ -54,6 +54,7 @@
struct pr_transport_id_holder {
int dest_local_nexus;
struct t10_pr_registration_s *dest_pr_reg;
+ struct se_portal_group_s *dest_tpg;
struct se_node_acl_s *dest_node_acl;
struct se_dev_entry_s *dest_se_deve;
struct list_head dest_list;
@@ -1035,6 +1036,90 @@ void core_scsi3_free_all_registrations(
spin_unlock(&pr_tmpl->aptpl_reg_lock);
}
+static int core_scsi3_tpg_depend_item(se_portal_group_t *tpg)
+{
+ return configfs_depend_item(TPG_TFO(tpg)->tf_subsys,
+ &tpg->tpg_group.cg_item);
+}
+
+static void core_scsi3_tpg_undepend_item(se_portal_group_t *tpg)
+{
+ configfs_undepend_item(TPG_TFO(tpg)->tf_subsys,
+ &tpg->tpg_group.cg_item);
+
+ atomic_dec(&tpg->tpg_pr_ref_count);
+ smp_mb__after_atomic_dec();
+}
+
+static int core_scsi3_nodeacl_depend_item(se_node_acl_t *nacl)
+{
+ se_portal_group_t *tpg = nacl->se_tpg;
+
+ if (nacl->nodeacl_flags & NAF_DYNAMIC_NODE_ACL)
+ return 0;
+
+ return configfs_depend_item(TPG_TFO(tpg)->tf_subsys,
+ &nacl->acl_group.cg_item);
+}
+
+static void core_scsi3_nodeacl_undepend_item(se_node_acl_t *nacl)
+{
+ se_portal_group_t *tpg = nacl->se_tpg;
+
+ if (nacl->nodeacl_flags & NAF_DYNAMIC_NODE_ACL) {
+ atomic_dec(&nacl->acl_pr_ref_count);
+ smp_mb__after_atomic_dec();
+ return;
+ }
+
+ configfs_undepend_item(TPG_TFO(tpg)->tf_subsys,
+ &nacl->acl_group.cg_item);
+
+ atomic_dec(&nacl->acl_pr_ref_count);
+ smp_mb__after_atomic_dec();
+}
+
+static int core_scsi3_lunacl_depend_item(se_dev_entry_t *se_deve)
+{
+ se_lun_acl_t *lun_acl = se_deve->se_lun_acl;
+ se_node_acl_t *nacl;
+ se_portal_group_t *tpg;
+ /*
+ * For nacl->nodeacl_flags & NAF_DYNAMIC_NODE_ACL)
+ */
+ if (!(lun_acl))
+ return 0;
+
+ nacl = lun_acl->se_lun_nacl;
+ tpg = nacl->se_tpg;
+
+ return configfs_depend_item(TPG_TFO(tpg)->tf_subsys,
+ &lun_acl->se_lun_group.cg_item);
+}
+
+static void core_scsi3_lunacl_undepend_item(se_dev_entry_t *se_deve)
+{
+ se_lun_acl_t *lun_acl = se_deve->se_lun_acl;
+ se_node_acl_t *nacl;
+ se_portal_group_t *tpg;
+ /*
+ * For nacl->nodeacl_flags & NAF_DYNAMIC_NODE_ACL)
+ */
+ if (!(lun_acl)) {
+ atomic_dec(&se_deve->pr_ref_count);
+ smp_mb__after_atomic_dec();
+ return;
+ }
+ nacl = lun_acl->se_lun_nacl;
+ tpg = nacl->se_tpg;
+
+ configfs_undepend_item(TPG_TFO(tpg)->tf_subsys,
+ &lun_acl->se_lun_group.cg_item);
+
+ atomic_dec(&se_deve->pr_ref_count);
+ smp_mb__after_atomic_dec();
+}
+
static int core_scsi3_decode_spec_i_port(
se_cmd_t *cmd,
se_portal_group_t *tpg,
--
1.5.6.5
--
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