@@ -100,8 +100,35 @@ static int pvcalls_back_release_active(struct xenbus_device *dev,
struct pvcalls_back_priv *priv,
struct sock_mapping *map);
+static void pvcalls_conn_back_read(unsigned long opaque)
+{
+}
+
+static int pvcalls_conn_back_write(struct sock_mapping *map)
+{
+ return 0;
+}
+
static void pvcalls_back_ioworker(struct work_struct *work)
{
+ struct pvcalls_ioworker *ioworker = container_of(work,
+ struct pvcalls_ioworker, register_work);
+ struct sock_mapping *map = container_of(ioworker, struct sock_mapping,
+ ioworker);
+
+ while (atomic_read(&map->io) > 0) {
+ if (atomic_read(&map->release) > 0) {
+ atomic_set(&map->release, 0);
+ return;
+ }
+
+ if (atomic_read(&map->read) > 0)
+ pvcalls_conn_back_read((unsigned long)map);
+ if (atomic_read(&map->write) > 0)
+ pvcalls_conn_back_write(map);
+
+ atomic_dec(&map->io);
+ }
}
static int pvcalls_back_socket(struct xenbus_device *dev,
We have one ioworker per socket. Each ioworker goes through the list of outstanding read/write requests. Once all requests have been dealt with, it returns. We use one atomic counter per socket for "read" operations and one for "write" operations to keep track of the reads/writes to do. We also use one atomic counter ("io") per ioworker to keep track of how many outstanding requests we have in total assigned to the ioworker. The ioworker finishes when there are none. Signed-off-by: Stefano Stabellini <stefano@aporeto.com> CC: boris.ostrovsky@oracle.com CC: jgross@suse.com --- drivers/xen/pvcalls-back.c | 27 +++++++++++++++++++++++++++ 1 file changed, 27 insertions(+)