target: Have dev/enable show if TCM device is configured

User tools need to know if the device is properly configured, since if
not, some other attributes are invalid.

Signed-off-by: Andy Grover <agrover@redhat.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>

diff --git a/drivers/target/target_core_configfs.c b/drivers/target/target_core_configfs.c
index 43b7ac6c5b1c80e5132bb793d4a447abf11f443c..4a8bd36d39588b24d8de02f495e4ca166c022795 100644 (file)
--- a/drivers/target/target_core_configfs.c
+++ b/drivers/target/target_core_configfs.c
@@ -1584,6 +1584,13 @@ static struct target_core_configfs_attribute target_core_attr_dev_udev_path = {
        .store  = target_core_store_dev_udev_path,
 };
 
+static ssize_t target_core_show_dev_enable(void *p, char *page)
+{
+       struct se_device *dev = p;
+
+       return snprintf(page, PAGE_SIZE, "%d\n", !!(dev->dev_flags & DF_CONFIGURED));
+}
+
 static ssize_t target_core_store_dev_enable(
        void *p,
        const char *page,
@@ -1609,8 +1616,8 @@ static ssize_t target_core_store_dev_enable(
 static struct target_core_configfs_attribute target_core_attr_dev_enable = {
        .attr   = { .ca_owner = THIS_MODULE,
                    .ca_name = "enable",
-                   .ca_mode = S_IWUSR },
-       .show   = NULL,
+                   .ca_mode =  S_IRUGO | S_IWUSR },
+       .show   = target_core_show_dev_enable,
        .store  = target_core_store_dev_enable,
 };