[v3,01/13] nbd: convert block client to use I/O channels for connection setup

diff --git a/Makefile b/Makefile
index d0de2d4..b7b0f24 100644
--- a/Makefile
+++ b/Makefile
@@ -234,9 +234,9 @@  util/module.o-cflags = -D'CONFIG_BLOCK_MODULES=$(block-modules)'
 
 qemu-img.o: qemu-img-cmds.h
 
-qemu-img$(EXESUF): qemu-img.o $(block-obj-y) $(crypto-obj-y) $(qom-obj-y) libqemuutil.a libqemustub.a
-qemu-nbd$(EXESUF): qemu-nbd.o $(block-obj-y) $(crypto-obj-y) $(qom-obj-y) libqemuutil.a libqemustub.a
-qemu-io$(EXESUF): qemu-io.o $(block-obj-y) $(crypto-obj-y) $(qom-obj-y) libqemuutil.a libqemustub.a
+qemu-img$(EXESUF): qemu-img.o $(block-obj-y) $(crypto-obj-y) $(io-obj-y) $(qom-obj-y) libqemuutil.a libqemustub.a
+qemu-nbd$(EXESUF): qemu-nbd.o $(block-obj-y) $(crypto-obj-y) $(io-obj-y) $(qom-obj-y) libqemuutil.a libqemustub.a
+qemu-io$(EXESUF): qemu-io.o $(block-obj-y) $(crypto-obj-y) $(io-obj-y) $(qom-obj-y) libqemuutil.a libqemustub.a
 
 qemu-bridge-helper$(EXESUF): qemu-bridge-helper.o
 
diff --git a/block/nbd-client.c b/block/nbd-client.c
index b7fd17a..bf5b0a3 100644
--- a/block/nbd-client.c
+++ b/block/nbd-client.c
@@ -27,7 +27,6 @@ 
  */
 
 #include "nbd-client.h"
-#include "qemu/sockets.h"
 
 #define HANDLE_TO_INDEX(bs, handle) ((handle) ^ ((uint64_t)(intptr_t)bs))
 #define INDEX_TO_HANDLE(bs, index)  ((index)  ^ ((uint64_t)(intptr_t)bs))
@@ -48,12 +47,16 @@  static void nbd_teardown_connection(BlockDriverState *bs)
     NbdClientSession *client = nbd_get_client_session(bs);
 
     /* finish any pending coroutines */
-    shutdown(client->sock, 2);
+    qio_channel_shutdown(client->ioc,
+                         QIO_CHANNEL_SHUTDOWN_BOTH,
+                         NULL);
     nbd_recv_coroutines_enter_all(client);
 
     nbd_client_detach_aio_context(bs);
-    closesocket(client->sock);
-    client->sock = -1;
+    object_unref(OBJECT(client->sioc));
+    client->sioc = NULL;
+    object_unref(OBJECT(client->ioc));
+    client->ioc = NULL;
 }
 
 static void nbd_reply_ready(void *opaque)
@@ -68,7 +71,7 @@  static void nbd_reply_ready(void *opaque)
          * that another thread has done the same thing in parallel, so
          * the socket is not readable anymore.
          */
-        ret = nbd_receive_reply(s->sock, &s->reply);
+        ret = nbd_receive_reply(s->sioc->fd, &s->reply);
         if (ret == -EAGAIN) {
             return;
         }
@@ -124,27 +127,23 @@  static int nbd_co_send_request(BlockDriverState *bs,
     s->send_coroutine = qemu_coroutine_self();
     aio_context = bdrv_get_aio_context(bs);
 
-    aio_set_fd_handler(aio_context, s->sock, false,
+    aio_set_fd_handler(aio_context, s->sioc->fd, false,
                        nbd_reply_ready, nbd_restart_write, bs);
     if (qiov) {
-        if (!s->is_unix) {
-            socket_set_cork(s->sock, 1);
-        }
-        rc = nbd_send_request(s->sock, request);
+        qio_channel_set_cork(s->ioc, true);
+        rc = nbd_send_request(s->sioc->fd, request);
         if (rc >= 0) {
-            ret = qemu_co_sendv(s->sock, qiov->iov, qiov->niov,
+            ret = qemu_co_sendv(s->sioc->fd, qiov->iov, qiov->niov,
                                 offset, request->len);
             if (ret != request->len) {
                 rc = -EIO;
             }
         }
-        if (!s->is_unix) {
-            socket_set_cork(s->sock, 0);
-        }
+        qio_channel_set_cork(s->ioc, false);
     } else {
-        rc = nbd_send_request(s->sock, request);
+        rc = nbd_send_request(s->sioc->fd, request);
     }
-    aio_set_fd_handler(aio_context, s->sock, false,
+    aio_set_fd_handler(aio_context, s->sioc->fd, false,
                        nbd_reply_ready, NULL, bs);
     s->send_coroutine = NULL;
     qemu_co_mutex_unlock(&s->send_mutex);
@@ -165,7 +164,7 @@  static void nbd_co_receive_reply(NbdClientSession *s,
         reply->error = EIO;
     } else {
         if (qiov && reply->error == 0) {
-            ret = qemu_co_recvv(s->sock, qiov->iov, qiov->niov,
+            ret = qemu_co_recvv(s->sioc->fd, qiov->iov, qiov->niov,
                                 offset, request->len);
             if (ret != request->len) {
                 reply->error = EIO;
@@ -349,14 +348,14 @@  int nbd_client_co_discard(BlockDriverState *bs, int64_t sector_num,
 void nbd_client_detach_aio_context(BlockDriverState *bs)
 {
     aio_set_fd_handler(bdrv_get_aio_context(bs),
-                       nbd_get_client_session(bs)->sock,
+                       nbd_get_client_session(bs)->sioc->fd,
                        false, NULL, NULL, NULL);
 }
 
 void nbd_client_attach_aio_context(BlockDriverState *bs,
                                    AioContext *new_context)
 {
-    aio_set_fd_handler(new_context, nbd_get_client_session(bs)->sock,
+    aio_set_fd_handler(new_context, nbd_get_client_session(bs)->sioc->fd,
                        false, nbd_reply_ready, NULL, bs);
 }
 
@@ -369,39 +368,43 @@  void nbd_client_close(BlockDriverState *bs)
         .len = 0
     };
 
-    if (client->sock == -1) {
+    if (client->ioc == NULL) {
         return;
     }
 
-    nbd_send_request(client->sock, &request);
+    nbd_send_request(client->sioc->fd, &request);
 
     nbd_teardown_connection(bs);
 }
 
-int nbd_client_init(BlockDriverState *bs, int sock, const char *export,
-                    Error **errp)
+int nbd_client_init(BlockDriverState *bs, QIOChannelSocket *sioc,
+                    const char *export, Error **errp)
 {
     NbdClientSession *client = nbd_get_client_session(bs);
     int ret;
 
     /* NBD handshake */
     logout("session init %s\n", export);
-    qemu_set_block(sock);
-    ret = nbd_receive_negotiate(sock, export,
+    qio_channel_set_blocking(QIO_CHANNEL(sioc), true, NULL);
+
+    ret = nbd_receive_negotiate(sioc->fd, export,
                                 &client->nbdflags, &client->size, errp);
     if (ret < 0) {
         logout("Failed to negotiate with the NBD server\n");
-        closesocket(sock);
         return ret;
     }
 
     qemu_co_mutex_init(&client->send_mutex);
     qemu_co_mutex_init(&client->free_sema);
-    client->sock = sock;
+    client->sioc = sioc;
+    object_ref(OBJECT(client->sioc));
+    client->ioc = QIO_CHANNEL(sioc);
+    object_ref(OBJECT(client->ioc));
 
     /* Now that we're connected, set the socket to be non-blocking and
      * kick the reply mechanism.  */
-    qemu_set_nonblock(sock);
+    qio_channel_set_blocking(QIO_CHANNEL(sioc), false, NULL);
+
     nbd_client_attach_aio_context(bs, bdrv_get_aio_context(bs));
 
     logout("Established connection with NBD server\n");
diff --git a/block/nbd-client.h b/block/nbd-client.h
index e841340..e8b3283 100644
--- a/block/nbd-client.h
+++ b/block/nbd-client.h
@@ -4,6 +4,7 @@ 
 #include "qemu-common.h"
 #include "block/nbd.h"
 #include "block/block_int.h"
+#include "io/channel-socket.h"
 
 /* #define DEBUG_NBD */
 
@@ -17,7 +18,8 @@ 
 #define MAX_NBD_REQUESTS    16
 
 typedef struct NbdClientSession {
-    int sock;
+    QIOChannelSocket *sioc; /* The master data channel */
+    QIOChannel *ioc; /* The current I/O channel which may differ (eg TLS) */
     uint32_t nbdflags;
     off_t size;
 
@@ -34,7 +36,9 @@  typedef struct NbdClientSession {
 
 NbdClientSession *nbd_get_client_session(BlockDriverState *bs);
 
-int nbd_client_init(BlockDriverState *bs, int sock, const char *export_name,
+int nbd_client_init(BlockDriverState *bs,
+                    QIOChannelSocket *sock,
+                    const char *export_name,
                     Error **errp);
 void nbd_client_close(BlockDriverState *bs);
 
diff --git a/block/nbd.c b/block/nbd.c
index 416f42b..072fc5f 100644
--- a/block/nbd.c
+++ b/block/nbd.c
@@ -30,7 +30,6 @@ 
 #include "qemu/uri.h"
 #include "block/block_int.h"
 #include "qemu/module.h"
-#include "qemu/sockets.h"
 #include "qapi/qmp/qdict.h"
 #include "qapi/qmp/qjson.h"
 #include "qapi/qmp/qint.h"
@@ -239,25 +238,25 @@  NbdClientSession *nbd_get_client_session(BlockDriverState *bs)
     return &s->client;
 }
 
-static int nbd_establish_connection(BlockDriverState *bs,
-                                    SocketAddress *saddr,
-                                    Error **errp)
+static QIOChannelSocket *nbd_establish_connection(SocketAddress *saddr,
+                                                  Error **errp)
 {
-    BDRVNBDState *s = bs->opaque;
-    int sock;
+    QIOChannelSocket *sioc;
+    Error *local_err = NULL;
 
-    sock = socket_connect(saddr, errp, NULL, NULL);
+    sioc = qio_channel_socket_new();
 
-    if (sock < 0) {
-        logout("Failed to establish connection to NBD server\n");
-        return -EIO;
+    qio_channel_socket_connect_sync(sioc,
+                                    saddr,
+                                    &local_err);
+    if (local_err) {
+        error_propagate(errp, local_err);
+        return NULL;
     }
 
-    if (!s->client.is_unix) {
-        socket_set_nodelay(sock);
-    }
+    qio_channel_set_delay(QIO_CHANNEL(sioc), false);
 
-    return sock;
+    return sioc;
 }
 
 static int nbd_open(BlockDriverState *bs, QDict *options, int flags,
@@ -265,7 +264,8 @@  static int nbd_open(BlockDriverState *bs, QDict *options, int flags,
 {
     BDRVNBDState *s = bs->opaque;
     char *export = NULL;
-    int result, sock;
+    int result;
+    QIOChannelSocket *sioc;
     SocketAddress *saddr;
 
     /* Pop the config into our state object. Exit if invalid. */
@@ -277,15 +277,16 @@  static int nbd_open(BlockDriverState *bs, QDict *options, int flags,
     /* establish TCP connection, return error if it fails
      * TODO: Configurable retry-until-timeout behaviour.
      */
-    sock = nbd_establish_connection(bs, saddr, errp);
+    sioc = nbd_establish_connection(saddr, errp);
     qapi_free_SocketAddress(saddr);
-    if (sock < 0) {
+    if (!sioc) {
         g_free(export);
-        return sock;
+        return -ECONNREFUSED;
     }
 
     /* NBD handshake */
-    result = nbd_client_init(bs, sock, export, errp);
+    result = nbd_client_init(bs, sioc, export, errp);
+    object_unref(OBJECT(sioc));
     g_free(export);
     return result;
 }
diff --git a/tests/Makefile b/tests/Makefile
index b7352f1..4c2958e 100644
--- a/tests/Makefile
+++ b/tests/Makefile
@@ -390,8 +390,8 @@  test-qapi-obj-y = tests/test-qapi-visit.o tests/test-qapi-types.o \
 	tests/test-qapi-event.o tests/test-qmp-introspect.o \
 	$(test-qom-obj-y)
 test-crypto-obj-y = $(crypto-obj-y) $(test-qom-obj-y)
-test-block-obj-y = $(block-obj-y) $(test-crypto-obj-y)
 test-io-obj-y = $(io-obj-y) $(test-crypto-obj-y)
+test-block-obj-y = $(block-obj-y) $(test-io-obj-y)
 
 tests/check-qint$(EXESUF): tests/check-qint.o $(test-util-obj-y)
 tests/check-qstring$(EXESUF): tests/check-qstring.o $(test-util-obj-y)