Commit e4a683c8 authored by Jerome Marchand's avatar Jerome Marchand Committed by Jens Axboe

kref: add kref_test_and_get

Add kref_test_and_get() function, which atomically add a reference only if
refcount is not zero. This prevent to add a reference to an object that is
already being removed.
Signed-off-by: default avatarJerome Marchand <>
Signed-off-by: default avatarJens Axboe <>
parent a6e8dc46
......@@ -23,6 +23,7 @@ struct kref {
void kref_init(struct kref *kref);
void kref_get(struct kref *kref);
int kref_test_and_get(struct kref *kref);
int kref_put(struct kref *kref, void (*release) (struct kref *kref));
#endif /* _KREF_H_ */
......@@ -36,6 +36,18 @@ void kref_get(struct kref *kref)
* kref_test_and_get - increment refcount for object only if refcount is not
* zero.
* @kref: object.
* Return non-zero if the refcount was incremented, 0 otherwise
int kref_test_and_get(struct kref *kref)
return atomic_inc_not_zero(&kref->refcount);
* kref_put - decrement refcount for object.
* @kref: object.
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