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target: fix ALUA transition timeout handling 

The implicit transition time tells initiators the min time
to wait before timing out a transition. We currently schedule
the transition to occur in tg_pt_gp_implicit_trans_secs
seconds so there is no room for delays. If
core_alua_do_transition_tg_pt_work->core_alua_update_tpg_primary_metadata
needs to write out info to a remote file, then the initiator can
easily time out the operation.

Signed-off-by: Mike Christie <mchristi@redhat.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
hifive-unleashed-5.1
Mike Christie 2017-03-02 04:59:48 -06:00 committed by Nicholas Bellinger
parent 207ee84133
commit d7175373f2
2 changed files with 9 additions and 16 deletions
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23
drivers/target/target_core_alua.c
View File

@ -1013,7 +1013,7 @@ static void core_alua_queue_state_change_ua(struct t10_alua_tg_pt_gp *tg_pt_gp)
static void core_alua_do_transition_tg_pt_work(struct work_struct *work)
{
struct t10_alua_tg_pt_gp *tg_pt_gp = container_of(work,
struct t10_alua_tg_pt_gp, tg_pt_gp_transition_work.work);
struct t10_alua_tg_pt_gp, tg_pt_gp_transition_work);
struct se_device *dev = tg_pt_gp->tg_pt_gp_dev;
bool explicit = (tg_pt_gp->tg_pt_gp_alua_access_status ==
ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG);
@ -1076,13 +1076,12 @@ static int core_alua_do_transition_tg_pt(
/*
* Flush any pending transitions
*/
if (!explicit && tg_pt_gp->tg_pt_gp_implicit_trans_secs &&
atomic_read(&tg_pt_gp->tg_pt_gp_alua_access_state) ==
if (!explicit && atomic_read(&tg_pt_gp->tg_pt_gp_alua_access_state) ==
ALUA_ACCESS_STATE_TRANSITION) {
/* Just in case */
tg_pt_gp->tg_pt_gp_alua_pending_state = new_state;
tg_pt_gp->tg_pt_gp_transition_complete = &wait;
flush_delayed_work(&tg_pt_gp->tg_pt_gp_transition_work);
flush_work(&tg_pt_gp->tg_pt_gp_transition_work);
wait_for_completion(&wait);
tg_pt_gp->tg_pt_gp_transition_complete = NULL;
return 0;
@ -1117,15 +1116,9 @@ static int core_alua_do_transition_tg_pt(
atomic_inc(&tg_pt_gp->tg_pt_gp_ref_cnt);
spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
if (!explicit && tg_pt_gp->tg_pt_gp_implicit_trans_secs) {
unsigned long transition_tmo;
transition_tmo = tg_pt_gp->tg_pt_gp_implicit_trans_secs * HZ;
schedule_delayed_work(&tg_pt_gp->tg_pt_gp_transition_work,
transition_tmo);
} else {
schedule_work(&tg_pt_gp->tg_pt_gp_transition_work);
if (explicit) {
tg_pt_gp->tg_pt_gp_transition_complete = &wait;
schedule_delayed_work(&tg_pt_gp->tg_pt_gp_transition_work, 0);
wait_for_completion(&wait);
tg_pt_gp->tg_pt_gp_transition_complete = NULL;
}
@ -1696,8 +1689,8 @@ struct t10_alua_tg_pt_gp *core_alua_allocate_tg_pt_gp(struct se_device *dev,
mutex_init(&tg_pt_gp->tg_pt_gp_md_mutex);
spin_lock_init(&tg_pt_gp->tg_pt_gp_lock);
atomic_set(&tg_pt_gp->tg_pt_gp_ref_cnt, 0);
INIT_DELAYED_WORK(&tg_pt_gp->tg_pt_gp_transition_work,
core_alua_do_transition_tg_pt_work);
INIT_WORK(&tg_pt_gp->tg_pt_gp_transition_work,
core_alua_do_transition_tg_pt_work);
tg_pt_gp->tg_pt_gp_dev = dev;
atomic_set(&tg_pt_gp->tg_pt_gp_alua_access_state,
ALUA_ACCESS_STATE_ACTIVE_OPTIMIZED);
@ -1805,7 +1798,7 @@ void core_alua_free_tg_pt_gp(
dev->t10_alua.alua_tg_pt_gps_counter--;
spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
flush_delayed_work(&tg_pt_gp->tg_pt_gp_transition_work);
flush_work(&tg_pt_gp->tg_pt_gp_transition_work);
/*
* Allow a struct t10_alua_tg_pt_gp_member * referenced by

2
include/target/target_core_base.h
View File

@ -299,7 +299,7 @@ struct t10_alua_tg_pt_gp {
struct list_head tg_pt_gp_lun_list;
struct se_lun *tg_pt_gp_alua_lun;
struct se_node_acl *tg_pt_gp_alua_nacl;
struct delayed_work tg_pt_gp_transition_work;
struct work_struct tg_pt_gp_transition_work;
struct completion *tg_pt_gp_transition_complete;
};