add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/drivers/nvdimm/btt_devs.c
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@@ -1,14 +1,6 @@
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+// SPDX-License-Identifier: GPL-2.0-only
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 /*
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  * Copyright(c) 2013-2015 Intel Corporation. All rights reserved.
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- *
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- * This program is free software; you can redistribute it and/or modify
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- * it under the terms of version 2 of the GNU General Public License as
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- * published by the Free Software Foundation.
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- *
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- * This program is distributed in the hope that it will be useful, but
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- * WITHOUT ANY WARRANTY; without even the implied warranty of
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- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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- * General Public License for more details.
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  */
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 #include <linux/blkdev.h>
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 #include <linux/device.h>
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@@ -32,17 +24,6 @@
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 	kfree(nd_btt->uuid);
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 	kfree(nd_btt);
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 }
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-
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-static struct device_type nd_btt_device_type = {
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-	.name = "nd_btt",
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-	.release = nd_btt_release,
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-};
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-
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-bool is_nd_btt(struct device *dev)
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-{
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-	return dev->type == &nd_btt_device_type;
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-}
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-EXPORT_SYMBOL(is_nd_btt);
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 struct nd_btt *to_nd_btt(struct device *dev)
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 {
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@@ -70,14 +51,14 @@
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 	struct nd_btt *nd_btt = to_nd_btt(dev);
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 	ssize_t rc;
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-	device_lock(dev);
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+	nd_device_lock(dev);
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 	nvdimm_bus_lock(dev);
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 	rc = nd_size_select_store(dev, buf, &nd_btt->lbasize,
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 			btt_lbasize_supported);
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 	dev_dbg(dev, "result: %zd wrote: %s%s", rc, buf,
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 			buf[len - 1] == '\n' ? "" : "\n");
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 	nvdimm_bus_unlock(dev);
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-	device_unlock(dev);
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+	nd_device_unlock(dev);
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 	return rc ? rc : len;
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 }
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@@ -99,11 +80,11 @@
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 	struct nd_btt *nd_btt = to_nd_btt(dev);
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 	ssize_t rc;
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-	device_lock(dev);
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+	nd_device_lock(dev);
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 	rc = nd_uuid_store(dev, &nd_btt->uuid, buf, len);
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 	dev_dbg(dev, "result: %zd wrote: %s%s", rc, buf,
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 			buf[len - 1] == '\n' ? "" : "\n");
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-	device_unlock(dev);
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+	nd_device_unlock(dev);
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 	return rc ? rc : len;
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 }
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@@ -128,13 +109,13 @@
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 	struct nd_btt *nd_btt = to_nd_btt(dev);
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 	ssize_t rc;
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-	device_lock(dev);
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+	nd_device_lock(dev);
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 	nvdimm_bus_lock(dev);
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 	rc = nd_namespace_store(dev, &nd_btt->ndns, buf, len);
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 	dev_dbg(dev, "result: %zd wrote: %s%s", rc, buf,
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 			buf[len - 1] == '\n' ? "" : "\n");
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 	nvdimm_bus_unlock(dev);
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-	device_unlock(dev);
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+	nd_device_unlock(dev);
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 	return rc;
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 }
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@@ -146,14 +127,14 @@
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 	struct nd_btt *nd_btt = to_nd_btt(dev);
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 	ssize_t rc;
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-	device_lock(dev);
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+	nd_device_lock(dev);
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 	if (dev->driver)
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 		rc = sprintf(buf, "%llu\n", nd_btt->size);
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 	else {
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 		/* no size to convey if the btt instance is disabled */
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 		rc = -ENXIO;
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 	}
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-	device_unlock(dev);
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+	nd_device_unlock(dev);
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 	return rc;
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 }
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@@ -186,6 +167,18 @@
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 	NULL,
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 };
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+static const struct device_type nd_btt_device_type = {
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+	.name = "nd_btt",
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+	.release = nd_btt_release,
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+	.groups = nd_btt_attribute_groups,
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+};
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+
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+bool is_nd_btt(struct device *dev)
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+{
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+	return dev->type == &nd_btt_device_type;
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+}
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+EXPORT_SYMBOL(is_nd_btt);
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+
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 static struct device *__nd_btt_create(struct nd_region *nd_region,
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 		unsigned long lbasize, u8 *uuid,
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 		struct nd_namespace_common *ndns)
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@@ -212,7 +205,6 @@
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 	dev_set_name(dev, "btt%d.%d", nd_region->id, nd_btt->id);
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 	dev->parent = &nd_region->dev;
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 	dev->type = &nd_btt_device_type;
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-	dev->groups = nd_btt_attribute_groups;
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 	device_initialize(&nd_btt->dev);
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 	if (ndns && !__nd_attach_ndns(&nd_btt->dev, ndns, &nd_btt->ndns)) {
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 		dev_dbg(&ndns->dev, "failed, already claimed by %s\n",