The VuServer object has a refcount field and ref/unref APIs. The name is
confusing because it's actually an in-flight request counter instead of
a refcount.
Normally a refcount destroys the object upon reaching zero. The VuServer
counter is used to wake up the vhost-user coroutine when there are no
more requests.
Avoid confusing by renaming refcount and ref/unref to in_flight and
inc/dec.
Signed-off-by: Stefan Hajnoczi <stefanha@xxxxxxxxxx>
---
include/qemu/vhost-user-server.h | 6 +++---
block/export/vhost-user-blk-server.c | 11 +++++++----
util/vhost-user-server.c | 14 +++++++-------
3 files changed, 17 insertions(+), 14 deletions(-)
diff --git a/include/qemu/vhost-user-server.h b/include/qemu/vhost-user-server.h
index 25c72433ca..bc0ac9ddb6 100644
--- a/include/qemu/vhost-user-server.h
+++ b/include/qemu/vhost-user-server.h
@@ -41,7 +41,7 @@ typedef struct {
const VuDevIface *vu_iface;
/* Protected by ctx lock */
- unsigned int refcount;
+ unsigned int in_flight;
bool wait_idle;
VuDev vu_dev;
QIOChannel *ioc; /* The I/O channel with the client */
@@ -60,8 +60,8 @@ bool vhost_user_server_start(VuServer *server,
void vhost_user_server_stop(VuServer *server);
-void vhost_user_server_ref(VuServer *server);
-void vhost_user_server_unref(VuServer *server);
+void vhost_user_server_inc_in_flight(VuServer *server);
+void vhost_user_server_dec_in_flight(VuServer *server);
void vhost_user_server_attach_aio_context(VuServer *server, AioContext *ctx);
void vhost_user_server_detach_aio_context(VuServer *server);
diff --git a/block/export/vhost-user-blk-server.c
b/block/export/vhost-user-blk-server.c
index 3409d9e02e..e93f2ed6b4 100644
--- a/block/export/vhost-user-blk-server.c
+++ b/block/export/vhost-user-blk-server.c
@@ -49,7 +49,10 @@ static void vu_blk_req_complete(VuBlkReq *req, size_t in_len)
free(req);
}
-/* Called with server refcount increased, must decrease before returning */
+/*
+ * Called with server in_flight counter increased, must decrease before
+ * returning.
+ */
static void coroutine_fn vu_blk_virtio_process_req(void *opaque)
{
VuBlkReq *req = opaque;
@@ -67,12 +70,12 @@ static void coroutine_fn vu_blk_virtio_process_req(void
*opaque)
in_num, out_num);
if (in_len < 0) {
free(req);
- vhost_user_server_unref(server);
+ vhost_user_server_dec_in_flight(server);
return;
}
vu_blk_req_complete(req, in_len);
- vhost_user_server_unref(server);
+ vhost_user_server_dec_in_flight(server);
}
static void vu_blk_process_vq(VuDev *vu_dev, int idx)
@@ -94,7 +97,7 @@ static void vu_blk_process_vq(VuDev *vu_dev, int idx)
Coroutine *co =
qemu_coroutine_create(vu_blk_virtio_process_req, req);
- vhost_user_server_ref(server);
+ vhost_user_server_inc_in_flight(server);
qemu_coroutine_enter(co);
}
}
diff --git a/util/vhost-user-server.c b/util/vhost-user-server.c
index 5b6216069c..1622f8cfb3 100644
--- a/util/vhost-user-server.c
+++ b/util/vhost-user-server.c
@@ -75,16 +75,16 @@ static void panic_cb(VuDev *vu_dev, const char *buf)
error_report("vu_panic: %s", buf);
}
-void vhost_user_server_ref(VuServer *server)
+void vhost_user_server_inc_in_flight(VuServer *server)
{
assert(!server->wait_idle);
- server->refcount++;
+ server->in_flight++;
}
-void vhost_user_server_unref(VuServer *server)
+void vhost_user_server_dec_in_flight(VuServer *server)
{
- server->refcount--;
- if (server->wait_idle && !server->refcount) {
+ server->in_flight--;
+ if (server->wait_idle && !server->in_flight) {
aio_co_wake(server->co_trip);
}
}
@@ -192,13 +192,13 @@ static coroutine_fn void vu_client_trip(void *opaque)
/* Keep running */
}
- if (server->refcount) {
+ if (server->in_flight) {
/* Wait for requests to complete before we can unmap the memory */
server->wait_idle = true;
qemu_coroutine_yield();
server->wait_idle = false;
}
- assert(server->refcount == 0);
+ assert(server->in_flight == 0);
vu_deinit(vu_dev);
