From 19e72d3abb63cb16d021a4066ce1a18880509e99 Mon Sep 17 00:00:00 2001
From: Bart Van Assche <bart.vanassche@sandisk.com>
Date: Thu, 9 Feb 2017 17:28:50 -0800
Subject: [PATCH] configfs: Introduce config_item_get_unless_zero()
Signed-off-by: Bart Van Assche <bart.vanassche@sandisk.com>
[hch: minor style tweak]
Signed-off-by: Christoph Hellwig <hch@lst.de>
---
fs/configfs/item.c | 8 ++++++++
include/linux/configfs.h | 3 ++-
2 files changed, 10 insertions(+), 1 deletion(-)
diff --git a/fs/configfs/item.c b/fs/configfs/item.c
index 8b2a994042dd..a66f6624d899 100644
--- a/fs/configfs/item.c
+++ b/fs/configfs/item.c
@@ -138,6 +138,14 @@ struct config_item *config_item_get(struct config_item *item)
}
EXPORT_SYMBOL(config_item_get);
+struct config_item *config_item_get_unless_zero(struct config_item *item)
+{
+ if (item && kref_get_unless_zero(&item->ci_kref))
+ return item;
+ return NULL;
+}
+EXPORT_SYMBOL(config_item_get_unless_zero);
+
static void config_item_cleanup(struct config_item *item)
{
struct config_item_type *t = item->ci_type;
diff --git a/include/linux/configfs.h b/include/linux/configfs.h
index 2319b8c108e8..c96709049683 100644
--- a/include/linux/configfs.h
+++ b/include/linux/configfs.h
@@ -74,7 +74,8 @@ extern void config_item_init_type_name(struct config_item *item,
const char *name,
struct config_item_type *type);
-extern struct config_item * config_item_get(struct config_item *);
+extern struct config_item *config_item_get(struct config_item *);
+extern struct config_item *config_item_get_unless_zero(struct config_item *);
extern void config_item_put(struct config_item *);
struct config_item_type {
--
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