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block/nbd: reuse nbd_co_do_establish_connection() in nbd_open()

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The only last step we need to reuse the function is coroutine-wrapper.
nbd_open() may be called from non-coroutine context. So, generate the
wrapper and use it.

Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Message-Id: <20210610100802.5888-31-vsementsov@virtuozzo.com>
Signed-off-by: Eric Blake <eblake@redhat.com>
This commit is contained in:
Vladimir Sementsov-Ogievskiy 2021-06-10 13:08:00 +03:00 committed by Eric Blake
parent 97cf89259e
commit a71d597b98
2 changed files with 11 additions and 98 deletions
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6
block/coroutines.h
View File

@ -66,4 +66,10 @@ int coroutine_fn bdrv_co_readv_vmstate(BlockDriverState *bs,
int coroutine_fn bdrv_co_writev_vmstate(BlockDriverState *bs,
QEMUIOVector *qiov, int64_t pos);
int generated_co_wrapper
nbd_do_establish_connection(BlockDriverState *bs, Error **errp);
int coroutine_fn
nbd_co_do_establish_connection(BlockDriverState *bs, Error **errp);
#endif /* BLOCK_COROUTINES_INT_H */

101
block/nbd.c
View File

@ -44,6 +44,7 @@
#include "block/qdict.h"
#include "block/nbd.h"
#include "block/block_int.h"
#include "block/coroutines.h"
#include "qemu/yank.h"
@ -99,11 +100,6 @@ typedef struct BDRVNBDState {
NBDClientConnection *conn;
} BDRVNBDState;
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)
@ -356,7 +352,7 @@ static int nbd_handle_updated_info(BlockDriverState *bs, Error **errp)
return 0;
}
static int coroutine_fn nbd_co_do_establish_connection(BlockDriverState *bs,
int coroutine_fn nbd_co_do_establish_connection(BlockDriverState *bs,
Error **errp)
{
BDRVNBDState *s = (BDRVNBDState *)bs->opaque;
@ -1573,83 +1569,6 @@ static void nbd_client_close(BlockDriverState *bs)
nbd_teardown_connection(bs);
}
static QIOChannelSocket *nbd_establish_connection(BlockDriverState *bs,
SocketAddress *saddr,
Error **errp)
{
ERRP_GUARD();
QIOChannelSocket *sioc;
sioc = qio_channel_socket_new();
qio_channel_set_name(QIO_CHANNEL(sioc), "nbd-client");
qio_channel_socket_connect_sync(sioc, saddr, errp);
if (*errp) {
object_unref(OBJECT(sioc));
return NULL;
}
yank_register_function(BLOCKDEV_YANK_INSTANCE(bs->node_name), nbd_yank, bs);
qio_channel_set_delay(QIO_CHANNEL(sioc), false);
return sioc;
}
/* 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(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(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(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) {
/*
* We have connected, but must fail for other reasons.
* Send NBD_CMD_DISC as a courtesy to the server.
*/
NBDRequest request = { .type = NBD_CMD_DISC };
nbd_send_request(s->ioc, &request);
yank_unregister_function(BLOCKDEV_YANK_INSTANCE(bs->node_name),
nbd_yank, bs);
object_unref(OBJECT(s->ioc));
s->ioc = NULL;
return ret;
}
return 0;
}
/*
* Parse nbd_open options
@ -2039,7 +1958,6 @@ 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);
@ -2057,22 +1975,11 @@ static int nbd_open(BlockDriverState *bs, QDict *options, int flags,
s->conn = nbd_client_connection_new(s->saddr, true, s->export,
s->x_dirty_bitmap, s->tlscreds);
/*
* establish TCP connection, return error if it fails
* TODO: Configurable retry-until-timeout behaviour.
*/
sioc = nbd_establish_connection(bs, s->saddr, errp);
if (!sioc) {
ret = -ECONNREFUSED;
goto fail;
}
ret = nbd_client_handshake(bs, sioc, errp);
/* TODO: Configurable retry-until-timeout behaviour. */
ret = nbd_do_establish_connection(bs, errp);
if (ret < 0) {
goto fail;
}
/* successfully connected */
s->state = NBD_CLIENT_CONNECTED;
s->connection_co = qemu_coroutine_create(nbd_connection_entry, s);
bdrv_inc_in_flight(bs);