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authorFam Zheng <famz@redhat.com>2015-10-23 11:08:08 +0800
committerKevin Wolf <kwolf@redhat.com>2015-10-23 18:18:24 +0200
commitc1e1e5fa8f25f9061b076a05045a6d4950d1a891 (patch)
treeb862d27d0accfcca71ade3ad4f577afa94cca62c /include
parent3a1e8074d74ad2acbcedf28d35aebedc3573f19e (diff)
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aio: introduce aio_{disable,enable}_external
Signed-off-by: Fam Zheng <famz@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Diffstat (limited to 'include')
-rw-r--r--include/block/aio.h38
1 files changed, 38 insertions, 0 deletions
diff --git a/include/block/aio.h b/include/block/aio.h
index 12f1141..bcc7d43 100644
--- a/include/block/aio.h
+++ b/include/block/aio.h
@@ -122,6 +122,8 @@ struct AioContext {
/* TimerLists for calling timers - one per clock type */
QEMUTimerListGroup tlg;
+
+ int external_disable_cnt;
};
/**
@@ -375,4 +377,40 @@ static inline void aio_timer_init(AioContext *ctx,
*/
int64_t aio_compute_timeout(AioContext *ctx);
+/**
+ * aio_disable_external:
+ * @ctx: the aio context
+ *
+ * Disable the further processing of external clients.
+ */
+static inline void aio_disable_external(AioContext *ctx)
+{
+ atomic_inc(&ctx->external_disable_cnt);
+}
+
+/**
+ * aio_enable_external:
+ * @ctx: the aio context
+ *
+ * Enable the processing of external clients.
+ */
+static inline void aio_enable_external(AioContext *ctx)
+{
+ assert(ctx->external_disable_cnt > 0);
+ atomic_dec(&ctx->external_disable_cnt);
+}
+
+/**
+ * aio_node_check:
+ * @ctx: the aio context
+ * @is_external: Whether or not the checked node is an external event source.
+ *
+ * Check if the node's is_external flag is okay to be polled by the ctx at this
+ * moment. True means green light.
+ */
+static inline bool aio_node_check(AioContext *ctx, bool is_external)
+{
+ return !is_external || !atomic_read(&ctx->external_disable_cnt);
+}
+
#endif