target: Add global device list for EXTENDED_COPY

EXTENDED_COPY needs to be able to search a global list of devices
based on NAA WWN device identifiers, so add a simple g_device_list
protected by g_device_mutex.

Cc: Christoph Hellwig <hch@lst.de>
Cc: Hannes Reinecke <hare@suse.de>
Cc: Martin Petersen <martin.petersen@oracle.com>
Cc: Chris Mason <chris.mason@fusionio.com>
Cc: Roland Dreier <roland@purestorage.com>
Cc: Zach Brown <zab@redhat.com>
Cc: James Bottomley <JBottomley@Parallels.com>
Cc: Nicholas Bellinger <nab@linux-iscsi.org>
Signed-off-by: Nicholas Bellinger <nab@daterainc.com>

1 files changed, 13 insertions, 0 deletions

diff --git a/drivers/target/target_core_device.c b/drivers/target/target_core_device.c
index f3dc1f5fc41c..b2b081236abb 100644
--- a/drivers/target/target_core_device.c
+++ b/drivers/target/target_core_device.c
@@ -47,6 +47,9 @@
 #include "target_core_pr.h"
 #include "target_core_ua.h"
 
+DEFINE_MUTEX(g_device_mutex);
+LIST_HEAD(g_device_list);
+
 static struct se_hba *lun0_hba;
 /* not static, needed by tpg.c */
 struct se_device *g_lun0_dev;
@@ -1406,6 +1409,7 @@ struct se_device *target_alloc_device(struct se_hba *hba, const char *name)
         INIT_LIST_HEAD(&dev->delayed_cmd_list);
         INIT_LIST_HEAD(&dev->state_list);
         INIT_LIST_HEAD(&dev->qf_cmd_list);
+        INIT_LIST_HEAD(&dev->g_dev_node);
         spin_lock_init(&dev->stats_lock);
         spin_lock_init(&dev->execute_task_lock);
         spin_lock_init(&dev->delayed_cmd_lock);
@@ -1525,6 +1529,11 @@ int target_configure_device(struct se_device *dev)
         spin_lock(&hba->device_lock);
         hba->dev_count++;
         spin_unlock(&hba->device_lock);
+
+        mutex_lock(&g_device_mutex);
+        list_add_tail(&dev->g_dev_node, &g_device_list);
+        mutex_unlock(&g_device_mutex);
+
         return 0;
 
 out_free_alua:
@@ -1543,6 +1552,10 @@ void target_free_device(struct se_device *dev)
         if (dev->dev_flags & DF_CONFIGURED) {
                 destroy_workqueue(dev->tmr_wq);
 
+                mutex_lock(&g_device_mutex);
+                list_del(&dev->g_dev_node);
+                mutex_unlock(&g_device_mutex);
+
                 spin_lock(&hba->device_lock);
                 hba->dev_count--;
                 spin_unlock(&hba->device_lock);