From: "Bryant G. Ly" <bryantly@linux.vnet.ibm.com>
Date: Tue, 6 Jun 2017 09:28:51 -0500
Subject: tcmu: Make dev_config configurable
Git-commit: ee01825220f01c0befea25f08325962fa9374ee2
Patch-mainline: v4.13-rc1
References: fate#323946

This allows for userspace to change the device path after
it has been created. Thus giving the user the ability to change
the path. The use case for this is to allow for virtual optical
to have media change.

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>
Acked-by: Lee Duncan <lduncan@suse.com>
---
 drivers/target/target_core_user.c | 41 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 41 insertions(+)

diff --git a/drivers/target/target_core_user.c b/drivers/target/target_core_user.c
index c8c84b71dc91..7c6475731895 100644
--- a/drivers/target/target_core_user.c
+++ b/drivers/target/target_core_user.c
@@ -1548,6 +1548,46 @@ static ssize_t tcmu_cmd_time_out_store(struct config_item *item, const char *pag
 }
 CONFIGFS_ATTR(tcmu_, cmd_time_out);
 
+static ssize_t tcmu_dev_path_show(struct config_item *item, char *page)
+{
+	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);
+
+	return snprintf(page, PAGE_SIZE, "%s\n", udev->dev_config);
+}
+
+static ssize_t tcmu_dev_path_store(struct config_item *item, const char *page,
+				   size_t count)
+{
+	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);
+	char *copy = NULL;
+	int ret;
+
+	copy = kstrdup(page, GFP_KERNEL);
+	if (!copy) {
+		kfree(copy);
+		return -EINVAL;
+	}
+	strlcpy(udev->dev_config, copy, TCMU_CONFIG_LEN);
+
+	/* 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_, dev_path);
+
 static ssize_t tcmu_dev_size_show(struct config_item *item, char *page)
 {
 	struct se_dev_attrib *da = container_of(to_config_group(item),
@@ -1626,6 +1666,7 @@ static ssize_t tcmu_emulate_write_cache_store(struct config_item *item,
 
 struct configfs_attribute *tcmu_attrib_attrs[] = {
 	&tcmu_attr_cmd_time_out,
+	&tcmu_attr_dev_path,
 	&tcmu_attr_dev_size,
 	&tcmu_attr_emulate_write_cache,
 	NULL,