[PATCH 1/2] nvme: add 'fast_io_fail_tmo' controller sysfs attribute

[Hannes Reinecke]

Add a 'fast_io_fail_tmo' controller sysfs attribute to make the
setting configurable during runtime.

Signed-off-by: Hannes Reinecke <hare at suse.de>
---
 drivers/nvme/host/core.c | 32 ++++++++++++++++++++++++++++++++
 1 file changed, 32 insertions(+)

diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index 4de6a3a13575..ba639049e385 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -3658,6 +3658,37 @@ static ssize_t nvme_ctrl_loss_tmo_store(struct device *dev,
 static DEVICE_ATTR(ctrl_loss_tmo, S_IRUGO | S_IWUSR,
 	nvme_ctrl_loss_tmo_show, nvme_ctrl_loss_tmo_store);
 
+static ssize_t nvme_fast_io_fail_tmo_show(struct device *dev,
+		struct device_attribute *attr, char *buf)
+{
+	struct nvme_ctrl *ctrl = dev_get_drvdata(dev);
+	struct nvmf_ctrl_options *opts = ctrl->opts;
+
+	if (opts->fast_io_fail_tmo == -1)
+		return sprintf(buf, "off\n");
+	return sprintf(buf, "%d\n", opts->fast_io_fail_tmo);
+}
+
+static ssize_t nvme_fast_io_fail_tmo_store(struct device *dev,
+		struct device_attribute *attr, const char *buf, size_t count)
+{
+	struct nvme_ctrl *ctrl = dev_get_drvdata(dev);
+	struct nvmf_ctrl_options *opts = ctrl->opts;
+	int fast_io_fail_tmo, err;
+
+	err = kstrtoint(buf, 10, &fast_io_fail_tmo);
+	if (err)
+		return -EINVAL;
+
+	else if (fast_io_fail_tmo < 0)
+		opts->fast_io_fail_tmo = -1;
+	else
+		opts->fast_io_fail_tmo = fast_io_fail_tmo;
+	return count;
+}
+static DEVICE_ATTR(fast_io_fail_tmo, S_IRUGO | S_IWUSR,
+	nvme_fast_io_fail_tmo_show, nvme_fast_io_fail_tmo_store);
+
 static ssize_t nvme_ctrl_reconnect_delay_show(struct device *dev,
 		struct device_attribute *attr, char *buf)
 {
@@ -3703,6 +3734,7 @@ static struct attribute *nvme_dev_attrs[] = {
 	&dev_attr_hostnqn.attr,
 	&dev_attr_hostid.attr,
 	&dev_attr_ctrl_loss_tmo.attr,
+	&dev_attr_fast_io_fail_tmo.attr,
 	&dev_attr_reconnect_delay.attr,
 	NULL
 };
-- 
2.29.2