pcpu_ref: add percpu_ref_tryget_many()

Add percpu_ref_tryget_many(), which works the same way as
percpu_ref_tryget(), but grabs specified number of refs.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Acked-by: Tejun Heo <tj@kernel.org>
Acked-by: Dennis Zhou <dennis@kernel.org>
Cc: Christoph Lameter <cl@linux.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

diff --git a/include/linux/percpu-refcount.h b/include/linux/percpu-refcount.h
index 390031e..22d9d18 100644 (file)
--- a/include/linux/percpu-refcount.h
+++ b/include/linux/percpu-refcount.h
@@ -210,15 +210,17 @@ static inline void percpu_ref_get(struct percpu_ref *ref)
 }
 
 /**
- * percpu_ref_tryget - try to increment a percpu refcount
+ * percpu_ref_tryget_many - try to increment a percpu refcount
  * @ref: percpu_ref to try-get
+ * @nr: number of references to get
  *
- * Increment a percpu refcount unless its count already reached zero.
+ * Increment a percpu refcount  by @nr unless its count already reached zero.
  * Returns %true on success; %false on failure.
  *
  * This function is safe to call as long as @ref is between init and exit.
  */
-static inline bool percpu_ref_tryget(struct percpu_ref *ref)
+static inline bool percpu_ref_tryget_many(struct percpu_ref *ref,
+                                         unsigned long nr)
 {
        unsigned long __percpu *percpu_count;
        bool ret;
@@ -226,10 +228,10 @@ static inline bool percpu_ref_tryget(struct percpu_ref *ref)
        rcu_read_lock();
 
        if (__ref_is_percpu(ref, &percpu_count)) {
-               this_cpu_inc(*percpu_count);
+               this_cpu_add(*percpu_count, nr);
                ret = true;
        } else {
-               ret = atomic_long_inc_not_zero(&ref->count);
+               ret = atomic_long_add_unless(&ref->count, nr, 0);
        }
 
        rcu_read_unlock();
@@ -237,6 +239,20 @@ static inline bool percpu_ref_tryget(struct percpu_ref *ref)
        return ret;
 }
 
+/**
+ * percpu_ref_tryget - try to increment a percpu refcount
+ * @ref: percpu_ref to try-get
+ *
+ * Increment a percpu refcount unless its count already reached zero.
+ * Returns %true on success; %false on failure.
+ *
+ * This function is safe to call as long as @ref is between init and exit.
+ */
+static inline bool percpu_ref_tryget(struct percpu_ref *ref)
+{
+       return percpu_ref_tryget_many(ref, 1);
+}
+
 /**
  * percpu_ref_tryget_live - try to increment a live percpu refcount
  * @ref: percpu_ref to try-get