[PATCH-v2 9/9] target: Only reset specific dynamic entries during lun_group creation

Nicholas A. Bellinger
2015-05-22T06:11:11Z

From: Nicholas Bellinger <nab@linux-iscsi.org>

This patch changes core_tpg_add_node_to_devs() to avoid unnecessarly
resetting every se_dev_entry in se_node_acl->tpg_lun_hlist when the
operation is driven by an explicit configfs se_lun->lun_group creation
via core_dev_add_lun() to only update a single se_lun.

Otherwise for the second core_tpg_check_initiator_node_acl() case, go
ahead and continue to scan the full set of currently active se_lun in
se_portal_group->tpg_lun_hlist.

Cc: Hannes Reinecke <hare@suse.de>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Sagi Grimberg <sagig@mellanox.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
---
drivers/target/target_core_device.c | 2 +-
drivers/target/target_core_internal.h | 3 ++-
drivers/target/target_core_tpg.c | 7 +++++--
3 files changed, 8 insertions(+), 4 deletions(-)

diff --git a/drivers/target/target_core_device.c b/drivers/target/target_core_device.c
index 7674c8f..c80a7a8 100644
--- a/drivers/target/target_core_device.c
+++ b/drivers/target/target_core_device.c
@@ -1186,7 +1186,7 @@ int core_dev_add_lun(
if (acl->dynamic_node_acl &&
(!tpg->se_tpg_tfo->tpg_check_demo_mode_login_only ||
!tpg->se_tpg_tfo->tpg_check_demo_mode_login_only(tpg))) {
- core_tpg_add_node_to_devs(acl, tpg);
+ core_tpg_add_node_to_devs(acl, tpg, lun);
}
}
mutex_unlock(&tpg->acl_node_mutex);
diff --git a/drivers/target/target_core_internal.h b/drivers/target/target_core_internal.h
index 2c160ce..ce80ca7 100644
--- a/drivers/target/target_core_internal.h
+++ b/drivers/target/target_core_internal.h
@@ -64,7 +64,8 @@ extern struct se_device *g_lun0_dev;

struct se_node_acl *__core_tpg_get_initiator_node_acl(struct se_portal_group *tpg,
const char *);
-void core_tpg_add_node_to_devs(struct se_node_acl *, struct se_portal_group *);
+void core_tpg_add_node_to_devs(struct se_node_acl *, struct se_portal_group *,
+ struct se_lun *);
void core_tpg_wait_for_nacl_pr_ref(struct se_node_acl *);
struct se_lun *core_tpg_alloc_lun(struct se_portal_group *, u32);
int core_tpg_add_lun(struct se_portal_group *, struct se_lun *,
diff --git a/drivers/target/target_core_tpg.c b/drivers/target/target_core_tpg.c
index 73c25bd..f66c208 100644
--- a/drivers/target/target_core_tpg.c
+++ b/drivers/target/target_core_tpg.c
@@ -89,7 +89,8 @@ EXPORT_SYMBOL(core_tpg_get_initiator_node_acl);
*/
void core_tpg_add_node_to_devs(
struct se_node_acl *acl,
- struct se_portal_group *tpg)
+ struct se_portal_group *tpg,
+ struct se_lun *lun_orig)
{
u32 lun_access = 0;
struct se_lun *lun;
@@ -99,6 +100,8 @@ void core_tpg_add_node_to_devs(
hlist_for_each_entry_rcu(lun, &tpg->tpg_lun_hlist, link) {
if (lun->lun_status != TRANSPORT_LUN_STATUS_ACTIVE)
continue;
+ if (lun_orig && lun != lun_orig)
+ continue;

dev = lun->lun_se_dev;
/*
@@ -238,7 +241,7 @@ struct se_node_acl *core_tpg_check_initiator_node_acl(
*/
if ((tpg->se_tpg_tfo->tpg_check_demo_mode_login_only == NULL) ||
(tpg->se_tpg_tfo->tpg_check_demo_mode_login_only(tpg) != 1))
- core_tpg_add_node_to_devs(acl, tpg);
+ core_tpg_add_node_to_devs(acl, tpg, NULL);

target_add_node_acl(acl);
return acl;
--
1.9.1