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kref: add kref_test_and_get

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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: Jerome Marchand <[email protected]>
Cc: [email protected]
Signed-off-by: Jens Axboe <[email protected]>
This commit is contained in:
Jerome Marchand authored and Jens Axboe committed 2011-01-05 16:57:37 +01:00
1 parent a6e8dc46ff
commit e4a683c899
2 files changed
+13
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include/linux/kref.h
+1
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@@ -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_ */
lib/kref.c
+12
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@@ -36,6 +36,18 @@ void kref_get(struct kref *kref)
smp_mb__after_atomic_inc();
}
/**
* 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.