tcmu: Add Type of reconfig into netlink

This patch adds more info about the attribute being changed,
so that usersapce can easily figure out what is happening.

Signed-off-by: Bryant G. Ly <bryantly@linux.vnet.ibm.com>
Reviewed-By: Mike Christie <mchristi@redhat.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>

2 files changed, 22 insertions, 6 deletions

diff --git a/drivers/target/target_core_user.c b/drivers/target/target_core_user.c
index 7c6475731895..afc1fd6bacaf 100644
--- a/drivers/target/target_core_user.c
+++ b/drivers/target/target_core_user.c
@@ -1176,7 +1176,8 @@ static int tcmu_release(struct uio_info *info, struct inode *inode)
         return 0;
 }
 
-static int tcmu_netlink_event(enum tcmu_genl_cmd cmd, const char *name, int minor)
+static int tcmu_netlink_event(enum tcmu_genl_cmd cmd, const char *name,
+                              int minor, int type)
 {
         struct sk_buff *skb;
         void *msg_header;
@@ -1198,6 +1199,10 @@ static int tcmu_netlink_event(enum tcmu_genl_cmd cmd, const char *name, int mino
         if (ret < 0)
                 goto free_skb;
 
+        ret = nla_put_u32(skb, TCMU_ATTR_TYPE, type);
+        if (ret < 0)
+                goto free_skb;
+
         genlmsg_end(skb, msg_header);
 
         ret = genlmsg_multicast_allns(&tcmu_genl_family, skb, 0,
@@ -1301,7 +1306,7 @@ static int tcmu_configure_device(struct se_device *dev)
         kref_get(&udev->kref);
 
         ret = tcmu_netlink_event(TCMU_CMD_ADDED_DEVICE, udev->uio_info.name,
-                                 udev->uio_info.uio_dev->minor);
+                                 udev->uio_info.uio_dev->minor, NO_RECONFIG);
         if (ret)
                 goto err_netlink;
 
@@ -1383,7 +1388,7 @@ static void tcmu_free_device(struct se_device *dev)
 
         if (tcmu_dev_configured(udev)) {
                 tcmu_netlink_event(TCMU_CMD_REMOVED_DEVICE, udev->uio_info.name,
-                                   udev->uio_info.uio_dev->minor);
+                                   udev->uio_info.uio_dev->minor, NO_RECONFIG);
 
                 uio_unregister_device(&udev->uio_info);
         }
@@ -1577,7 +1582,8 @@ static ssize_t tcmu_dev_path_store(struct config_item *item, const char *page,
         if (tcmu_dev_configured(udev)) {
                 ret = tcmu_netlink_event(TCMU_CMD_RECONFIG_DEVICE,
                                          udev->uio_info.name,
-                                         udev->uio_info.uio_dev->minor);
+                                         udev->uio_info.uio_dev->minor,
+                                         CONFIG_PATH);
                 if (ret) {
                         pr_err("Unable to reconfigure device\n");
                         return ret;
@@ -1615,7 +1621,8 @@ static ssize_t tcmu_dev_size_store(struct config_item *item, const char *page,
         if (tcmu_dev_configured(udev)) {
                 ret = tcmu_netlink_event(TCMU_CMD_RECONFIG_DEVICE,
                                          udev->uio_info.name,
-                                         udev->uio_info.uio_dev->minor);
+                                         udev->uio_info.uio_dev->minor,
+                                         CONFIG_SIZE);
                 if (ret) {
                         pr_err("Unable to reconfigure device\n");
                         return ret;
@@ -1654,7 +1661,8 @@ static ssize_t tcmu_emulate_write_cache_store(struct config_item *item,
         if (tcmu_dev_configured(udev)) {
                 ret = tcmu_netlink_event(TCMU_CMD_RECONFIG_DEVICE,
                                          udev->uio_info.name,
-                                         udev->uio_info.uio_dev->minor);
+                                         udev->uio_info.uio_dev->minor,
+                                         CONFIG_WRITECACHE);
                 if (ret) {
                         pr_err("Unable to reconfigure device\n");
                         return ret;
diff --git a/include/uapi/linux/target_core_user.h b/include/uapi/linux/target_core_user.h
index 403a61faada0..5b00e3500005 100644
--- a/include/uapi/linux/target_core_user.h
+++ b/include/uapi/linux/target_core_user.h
@@ -139,8 +139,16 @@ enum tcmu_genl_attr {
         TCMU_ATTR_UNSPEC,
         TCMU_ATTR_DEVICE,
         TCMU_ATTR_MINOR,
+        TCMU_ATTR_TYPE,
         __TCMU_ATTR_MAX,
 };
 #define TCMU_ATTR_MAX (__TCMU_ATTR_MAX - 1)
 
+enum tcmu_reconfig_types {
+        NO_RECONFIG,
+        CONFIG_PATH,
+        CONFIG_SIZE,
+        CONFIG_WRITECACHE,
+};
+
 #endif