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Diffstat (limited to 'block/nbd.c')
-rw-r--r--block/nbd.c98
1 files changed, 48 insertions, 50 deletions
diff --git a/block/nbd.c b/block/nbd.c
index 2abcedd..9f193d1 100644
--- a/block/nbd.c
+++ b/block/nbd.c
@@ -67,8 +67,7 @@ typedef enum NBDClientState {
} NBDClientState;
typedef struct BDRVNBDState {
- QIOChannelSocket *sioc; /* The master data channel */
- QIOChannel *ioc; /* The current I/O channel which may differ (eg TLS) */
+ QIOChannel *ioc; /* The current I/O channel */
NBDExportInfo info;
CoMutex send_mutex;
@@ -100,9 +99,11 @@ typedef struct BDRVNBDState {
NBDClientConnection *conn;
} BDRVNBDState;
-static int nbd_establish_connection(BlockDriverState *bs, SocketAddress *saddr,
- Error **errp);
-static int nbd_client_handshake(BlockDriverState *bs, Error **errp);
+static QIOChannelSocket *nbd_establish_connection(BlockDriverState *bs,
+ SocketAddress *saddr,
+ Error **errp);
+static int nbd_client_handshake(BlockDriverState *bs, QIOChannelSocket *sioc,
+ Error **errp);
static void nbd_yank(void *opaque);
static void nbd_clear_bdrvstate(BlockDriverState *bs)
@@ -359,6 +360,7 @@ static coroutine_fn void nbd_reconnect_attempt(BDRVNBDState *s)
{
int ret;
AioContext *aio_context = bdrv_get_aio_context(s->bs);
+ QIOChannelSocket *sioc;
if (!nbd_client_connecting(s)) {
return;
@@ -393,27 +395,26 @@ static coroutine_fn void nbd_reconnect_attempt(BDRVNBDState *s)
qio_channel_detach_aio_context(QIO_CHANNEL(s->ioc));
yank_unregister_function(BLOCKDEV_YANK_INSTANCE(s->bs->node_name),
nbd_yank, s->bs);
- object_unref(OBJECT(s->sioc));
- s->sioc = NULL;
object_unref(OBJECT(s->ioc));
s->ioc = NULL;
}
- s->sioc = nbd_co_establish_connection(s->conn, &s->info, &s->ioc, NULL);
- if (!s->sioc) {
+ sioc = nbd_co_establish_connection(s->conn, &s->info, &s->ioc, NULL);
+ if (!sioc) {
ret = -ECONNREFUSED;
goto out;
}
- qio_channel_set_blocking(QIO_CHANNEL(s->sioc), false, NULL);
- qio_channel_attach_aio_context(QIO_CHANNEL(s->sioc), aio_context);
if (s->ioc) {
- qio_channel_set_blocking(QIO_CHANNEL(s->ioc), false, NULL);
- qio_channel_attach_aio_context(QIO_CHANNEL(s->ioc), aio_context);
+ /* sioc is referenced by s->ioc */
+ object_unref(OBJECT(sioc));
} else {
- s->ioc = QIO_CHANNEL(s->sioc);
- object_ref(OBJECT(s->ioc));
+ s->ioc = QIO_CHANNEL(sioc);
}
+ sioc = NULL;
+
+ qio_channel_set_blocking(QIO_CHANNEL(s->ioc), false, NULL);
+ qio_channel_attach_aio_context(QIO_CHANNEL(s->ioc), aio_context);
yank_register_function(BLOCKDEV_YANK_INSTANCE(s->bs->node_name), nbd_yank,
s->bs);
@@ -430,8 +431,6 @@ static coroutine_fn void nbd_reconnect_attempt(BDRVNBDState *s)
yank_unregister_function(BLOCKDEV_YANK_INSTANCE(s->bs->node_name),
nbd_yank, s->bs);
- object_unref(OBJECT(s->sioc));
- s->sioc = NULL;
object_unref(OBJECT(s->ioc));
s->ioc = NULL;
@@ -566,8 +565,6 @@ static coroutine_fn void nbd_connection_entry(void *opaque)
qio_channel_detach_aio_context(QIO_CHANNEL(s->ioc));
yank_unregister_function(BLOCKDEV_YANK_INSTANCE(s->bs->node_name),
nbd_yank, s->bs);
- object_unref(OBJECT(s->sioc));
- s->sioc = NULL;
object_unref(OBJECT(s->ioc));
s->ioc = NULL;
}
@@ -1566,7 +1563,7 @@ static void nbd_yank(void *opaque)
BDRVNBDState *s = (BDRVNBDState *)bs->opaque;
qatomic_store_release(&s->state, NBD_CLIENT_QUIT);
- qio_channel_shutdown(QIO_CHANNEL(s->sioc), QIO_CHANNEL_SHUTDOWN_BOTH, NULL);
+ qio_channel_shutdown(QIO_CHANNEL(s->ioc), QIO_CHANNEL_SHUTDOWN_BOTH, NULL);
}
static void nbd_client_close(BlockDriverState *bs)
@@ -1581,57 +1578,64 @@ static void nbd_client_close(BlockDriverState *bs)
nbd_teardown_connection(bs);
}
-static int nbd_establish_connection(BlockDriverState *bs,
- SocketAddress *saddr,
- Error **errp)
+static QIOChannelSocket *nbd_establish_connection(BlockDriverState *bs,
+ SocketAddress *saddr,
+ Error **errp)
{
ERRP_GUARD();
- BDRVNBDState *s = (BDRVNBDState *)bs->opaque;
+ QIOChannelSocket *sioc;
- s->sioc = qio_channel_socket_new();
- qio_channel_set_name(QIO_CHANNEL(s->sioc), "nbd-client");
+ sioc = qio_channel_socket_new();
+ qio_channel_set_name(QIO_CHANNEL(sioc), "nbd-client");
- qio_channel_socket_connect_sync(s->sioc, saddr, errp);
+ qio_channel_socket_connect_sync(sioc, saddr, errp);
if (*errp) {
- object_unref(OBJECT(s->sioc));
- s->sioc = NULL;
- return -1;
+ object_unref(OBJECT(sioc));
+ return NULL;
}
yank_register_function(BLOCKDEV_YANK_INSTANCE(bs->node_name), nbd_yank, bs);
- qio_channel_set_delay(QIO_CHANNEL(s->sioc), false);
+ qio_channel_set_delay(QIO_CHANNEL(sioc), false);
- return 0;
+ return sioc;
}
-/* nbd_client_handshake takes ownership on s->sioc. On failure it's unref'ed. */
-static int nbd_client_handshake(BlockDriverState *bs, Error **errp)
+/* nbd_client_handshake takes ownership on sioc. */
+static int nbd_client_handshake(BlockDriverState *bs, QIOChannelSocket *sioc,
+ Error **errp)
{
BDRVNBDState *s = (BDRVNBDState *)bs->opaque;
AioContext *aio_context = bdrv_get_aio_context(bs);
int ret;
trace_nbd_client_handshake(s->export);
- qio_channel_set_blocking(QIO_CHANNEL(s->sioc), false, NULL);
- qio_channel_attach_aio_context(QIO_CHANNEL(s->sioc), aio_context);
+ qio_channel_set_blocking(QIO_CHANNEL(sioc), false, NULL);
+ qio_channel_attach_aio_context(QIO_CHANNEL(sioc), aio_context);
s->info.request_sizes = true;
s->info.structured_reply = true;
s->info.base_allocation = true;
s->info.x_dirty_bitmap = g_strdup(s->x_dirty_bitmap);
s->info.name = g_strdup(s->export ?: "");
- ret = nbd_receive_negotiate(aio_context, QIO_CHANNEL(s->sioc), s->tlscreds,
+ ret = nbd_receive_negotiate(aio_context, QIO_CHANNEL(sioc), s->tlscreds,
s->hostname, &s->ioc, &s->info, errp);
g_free(s->info.x_dirty_bitmap);
g_free(s->info.name);
if (ret < 0) {
yank_unregister_function(BLOCKDEV_YANK_INSTANCE(bs->node_name),
nbd_yank, bs);
- object_unref(OBJECT(s->sioc));
- s->sioc = NULL;
+ object_unref(OBJECT(sioc));
return ret;
}
+ if (s->ioc) {
+ /* sioc is referenced by s->ioc */
+ object_unref(OBJECT(sioc));
+ } else {
+ s->ioc = QIO_CHANNEL(sioc);
+ }
+ sioc = NULL;
+
ret = nbd_handle_updated_info(bs, errp);
if (ret < 0) {
/*
@@ -1640,23 +1644,15 @@ static int nbd_client_handshake(BlockDriverState *bs, Error **errp)
*/
NBDRequest request = { .type = NBD_CMD_DISC };
- nbd_send_request(s->ioc ?: QIO_CHANNEL(s->sioc), &request);
+ nbd_send_request(s->ioc, &request);
yank_unregister_function(BLOCKDEV_YANK_INSTANCE(bs->node_name),
nbd_yank, bs);
- object_unref(OBJECT(s->sioc));
- s->sioc = NULL;
object_unref(OBJECT(s->ioc));
s->ioc = NULL;
-
return ret;
}
- if (!s->ioc) {
- s->ioc = QIO_CHANNEL(s->sioc);
- object_ref(OBJECT(s->ioc));
- }
-
return 0;
}
@@ -2048,6 +2044,7 @@ static int nbd_open(BlockDriverState *bs, QDict *options, int flags,
{
int ret;
BDRVNBDState *s = (BDRVNBDState *)bs->opaque;
+ QIOChannelSocket *sioc;
s->bs = bs;
qemu_co_mutex_init(&s->send_mutex);
@@ -2069,12 +2066,13 @@ static int nbd_open(BlockDriverState *bs, QDict *options, int flags,
* establish TCP connection, return error if it fails
* TODO: Configurable retry-until-timeout behaviour.
*/
- if (nbd_establish_connection(bs, s->saddr, errp) < 0) {
+ sioc = nbd_establish_connection(bs, s->saddr, errp);
+ if (!sioc) {
ret = -ECONNREFUSED;
goto fail;
}
- ret = nbd_client_handshake(bs, errp);
+ ret = nbd_client_handshake(bs, sioc, errp);
if (ret < 0) {
goto fail;
}
generated by cgit v1.1 at 2024-12-23 14:55:22 +0000