[PATCH v1 2/4] tcmu: Add netlink for device reconfiguration

[Bryant G. Ly]

This gives tcmu the ability to handle events that can cause
reconfiguration, such as resize, path changes, write_cache, etc...

Signed-off-by: Bryant G. Ly <bryan...@linux.vnet.ibm.com>
Reviewed-By: Mike Christie <mchri...@redhat.com>
---
 drivers/target/target_core_user.c     | 12 ++++++++++++
 include/uapi/linux/target_core_user.h |  1 +
 2 files changed, 13 insertions(+)

diff --git a/drivers/target/target_core_user.c 
b/drivers/target/target_core_user.c
index 0c797cc..ae91822 100644
--- a/drivers/target/target_core_user.c
+++ b/drivers/target/target_core_user.c
@@ -1562,6 +1562,7 @@ static ssize_t tcmu_emulate_write_cache_store(struct 
config_item *item,
 {
        struct se_dev_attrib *da = container_of(to_config_group(item),
                                        struct se_dev_attrib, da_group);
+       struct tcmu_dev *udev = TCMU_DEV(da->da_dev);
        int val;
        int ret;
 
@@ -1570,6 +1571,17 @@ static ssize_t tcmu_emulate_write_cache_store(struct 
config_item *item,
                return ret;
 
        da->emulate_write_cache = val;
+
+       /* Check if device has been configured before */
+       if (tcmu_dev_configured(udev)) {
+               ret = tcmu_netlink_event(TCMU_CMD_RECONFIG_DEVICE,
+                                        udev->uio_info.name,
+                                        udev->uio_info.uio_dev->minor);
+               if (ret) {
+                       pr_err("Unable to reconfigure device\n");
+                       return ret;
+               }
+       }
        return count;
 }
 CONFIGFS_ATTR(tcmu_, emulate_write_cache);
diff --git a/include/uapi/linux/target_core_user.h 
b/include/uapi/linux/target_core_user.h
index af17b41..403a61f 100644
--- a/include/uapi/linux/target_core_user.h
+++ b/include/uapi/linux/target_core_user.h
@@ -130,6 +130,7 @@ enum tcmu_genl_cmd {
        TCMU_CMD_UNSPEC,
        TCMU_CMD_ADDED_DEVICE,
        TCMU_CMD_REMOVED_DEVICE,
+       TCMU_CMD_RECONFIG_DEVICE,
        __TCMU_CMD_MAX,
 };
 #define TCMU_CMD_MAX (__TCMU_CMD_MAX - 1)
-- 
2.5.4 (Apple Git-61)