[PATCH V3 2/3] nvmet: revalidate-ns & generate AEN from configfs

[Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>]

Add a new attribute resize_check for the namespace which allows users
to revalidate and generate the AEN if needed. This attribute is needed
so that we can install userspace rules with systemd service based on
inotify/fsnotify/uevent. The registered callback for such a service will
end up writing to this attribute to generate AEN if needed.

Signed-off-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>
---
 drivers/nvme/target/configfs.c | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/drivers/nvme/target/configfs.c b/drivers/nvme/target/configfs.c
index 24eb4cf53b4f..a49ef932bd78 100644
--- a/drivers/nvme/target/configfs.c
+++ b/drivers/nvme/target/configfs.c
@@ -540,6 +540,31 @@ static ssize_t nvmet_ns_buffered_io_store(struct config_item *item,
 
 CONFIGFS_ATTR(nvmet_ns_, buffered_io);
 
+static ssize_t nvmet_ns_resize_check_store(struct config_item *item,
+		const char *page, size_t count)
+{
+	struct nvmet_ns *ns = to_nvmet_ns(item);
+	bool val;
+
+	if (strtobool(page, &val))
+		return -EINVAL;
+
+	if (!val)
+		return count;
+
+	mutex_lock(&ns->subsys->lock);
+	if (!ns->enabled) {
+		pr_err("enable ns before revalidate.\n");
+		mutex_unlock(&ns->subsys->lock);
+		return -EINVAL;
+	}
+	nvmet_ns_revalidate(ns);
+	mutex_unlock(&ns->subsys->lock);
+	return count;
+}
+
+CONFIGFS_ATTR_WO(nvmet_ns_, resize_check);
+
 static struct configfs_attribute *nvmet_ns_attrs[] = {
 	&nvmet_ns_attr_device_path,
 	&nvmet_ns_attr_device_nguid,
@@ -547,6 +572,7 @@ static struct configfs_attribute *nvmet_ns_attrs[] = {
 	&nvmet_ns_attr_ana_grpid,
 	&nvmet_ns_attr_enable,
 	&nvmet_ns_attr_buffered_io,
+	&nvmet_ns_attr_resize_check,
 #ifdef CONFIG_PCI_P2PDMA
 	&nvmet_ns_attr_p2pmem,
 #endif
-- 
2.22.1


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