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lib/iscsi: Reduce critical region during target node shutdown

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iSCSI mutex had guarded both unregister operation and destruct
operation in a single critical region in spdk_iscsi_shutdown_tgt_nodes
and spdk_iscsi_shutdown_tgt_node_by_name.

Subsequent patches will separate unregister operation and
destruct operation, and so this patch separates critical region of
unregister operation and destruct operation.

Change-Id: I847915f8277c4475c034ca64fd07ccdd47659590
Signed-off-by: Shuhei Matsumoto <shuhei.matsumoto.xt@hitachi.com>
Reviewed-on: https://review.gerrithub.io/c/spdk/spdk/+/450583
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
Reviewed-by: Changpeng Liu <changpeng.liu@intel.com>
Reviewed-by: Ben Walker <benjamin.walker@intel.com>
Reviewed-by: Jim Harris <james.r.harris@intel.com>
This commit is contained in:
Shuhei Matsumoto 2019-04-09 15:09:43 +09:00 committed by Ben Walker
parent 907ef2555f
commit da98b92b92
1 changed files with 13 additions and 3 deletions
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16
lib/iscsi/tgt_node.c
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@ -635,7 +635,10 @@ iscsi_tgt_node_destruct(struct spdk_iscsi_tgt_node *target)
free(target->name);
free(target->alias);
pthread_mutex_lock(&g_spdk_iscsi.mutex);
iscsi_tgt_node_delete_all_pg_maps(target);
pthread_mutex_unlock(&g_spdk_iscsi.mutex);
pthread_mutex_destroy(&target->mutex);
free(target);
@ -1228,12 +1231,18 @@ int spdk_iscsi_parse_tgt_nodes(void)
void
spdk_iscsi_shutdown_tgt_nodes(void)
{
struct spdk_iscsi_tgt_node *target, *tmp;
struct spdk_iscsi_tgt_node *target;
pthread_mutex_lock(&g_spdk_iscsi.mutex);
TAILQ_FOREACH_SAFE(target, &g_spdk_iscsi.target_head, tailq, tmp) {
while (!TAILQ_EMPTY(&g_spdk_iscsi.target_head)) {
target = TAILQ_FIRST(&g_spdk_iscsi.target_head);
TAILQ_REMOVE(&g_spdk_iscsi.target_head, target, tailq);
pthread_mutex_unlock(&g_spdk_iscsi.mutex);
iscsi_tgt_node_destruct(target);
pthread_mutex_lock(&g_spdk_iscsi.mutex);
}
pthread_mutex_unlock(&g_spdk_iscsi.mutex);
}
@ -1247,9 +1256,10 @@ spdk_iscsi_shutdown_tgt_node_by_name(const char *target_name)
target = spdk_iscsi_find_tgt_node(target_name);
if (target != NULL) {
iscsi_tgt_node_unregister(target);
iscsi_tgt_node_destruct(target);
pthread_mutex_unlock(&g_spdk_iscsi.mutex);
iscsi_tgt_node_destruct(target);
return 0;
}
pthread_mutex_unlock(&g_spdk_iscsi.mutex);