From 19e72d3abb63cb16d021a4066ce1a18880509e99 Mon Sep 17 00:00:00 2001 From: Bart Van Assche Date: Thu, 9 Feb 2017 17:28:50 -0800 Subject: configfs: Introduce config_item_get_unless_zero() Signed-off-by: Bart Van Assche [hch: minor style tweak] Signed-off-by: Christoph Hellwig --- 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 { -- cgit v1.2.3