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[PULL 28/34] nbd/client-connection: return only one io channel
From: |
Eric Blake |
Subject: |
[PULL 28/34] nbd/client-connection: return only one io channel |
Date: |
Tue, 15 Jun 2021 15:47:50 -0500 |
From: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
block/nbd doesn't need underlying sioc channel anymore. So, we can
update nbd/client-connection interface to return only one top-most io
channel, which is more straight forward.
Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Message-Id: <20210610100802.5888-27-vsementsov@virtuozzo.com>
Signed-off-by: Eric Blake <eblake@redhat.com>
---
include/block/nbd.h | 4 ++--
block/nbd.c | 13 ++-----------
nbd/client-connection.c | 33 +++++++++++++++++++++++++--------
3 files changed, 29 insertions(+), 21 deletions(-)
diff --git a/include/block/nbd.h b/include/block/nbd.h
index 5bb54d831c8a..10c8a0bcca80 100644
--- a/include/block/nbd.h
+++ b/include/block/nbd.h
@@ -418,9 +418,9 @@ NBDClientConnection *nbd_client_connection_new(const
SocketAddress *saddr,
QCryptoTLSCreds *tlscreds);
void nbd_client_connection_release(NBDClientConnection *conn);
-QIOChannelSocket *coroutine_fn
+QIOChannel *coroutine_fn
nbd_co_establish_connection(NBDClientConnection *conn, NBDExportInfo *info,
- QIOChannel **ioc, Error **errp);
+ Error **errp);
void coroutine_fn nbd_co_establish_connection_cancel(NBDClientConnection
*conn);
diff --git a/block/nbd.c b/block/nbd.c
index 9f193d130bcd..411435c1559e 100644
--- a/block/nbd.c
+++ b/block/nbd.c
@@ -360,7 +360,6 @@ 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;
@@ -399,20 +398,12 @@ static coroutine_fn void
nbd_reconnect_attempt(BDRVNBDState *s)
s->ioc = NULL;
}
- sioc = nbd_co_establish_connection(s->conn, &s->info, &s->ioc, NULL);
- if (!sioc) {
+ s->ioc = nbd_co_establish_connection(s->conn, &s->info, NULL);
+ if (!s->ioc) {
ret = -ECONNREFUSED;
goto out;
}
- if (s->ioc) {
- /* sioc is referenced by s->ioc */
- object_unref(OBJECT(sioc));
- } else {
- 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);
diff --git a/nbd/client-connection.c b/nbd/client-connection.c
index 883f9cf158cb..72138a5ff74a 100644
--- a/nbd/client-connection.c
+++ b/nbd/client-connection.c
@@ -272,15 +272,15 @@ void nbd_client_connection_release(NBDClientConnection
*conn)
* nbd_receive_export_list() would be zero (see description of NBDExportInfo in
* include/block/nbd.h).
*/
-QIOChannelSocket *coroutine_fn
+QIOChannel *coroutine_fn
nbd_co_establish_connection(NBDClientConnection *conn, NBDExportInfo *info,
- QIOChannel **ioc, Error **errp)
+ Error **errp)
{
+ QIOChannel *ioc;
QemuThread thread;
if (conn->do_negotiation) {
assert(info);
- assert(ioc);
}
WITH_QEMU_LOCK_GUARD(&conn->mutex) {
@@ -294,10 +294,17 @@ nbd_co_establish_connection(NBDClientConnection *conn,
NBDExportInfo *info,
if (conn->sioc) {
/* Previous attempt finally succeeded in background */
if (conn->do_negotiation) {
- *ioc = g_steal_pointer(&conn->ioc);
+ ioc = g_steal_pointer(&conn->ioc);
memcpy(info, &conn->updated_info, sizeof(*info));
}
- return g_steal_pointer(&conn->sioc);
+ if (ioc) {
+ /* TLS channel now has own reference to parent */
+ object_unref(OBJECT(conn->sioc));
+ } else {
+ ioc = QIO_CHANNEL(conn->sioc);
+ }
+ conn->sioc = NULL;
+ return ioc;
}
conn->running = true;
@@ -329,11 +336,21 @@ nbd_co_establish_connection(NBDClientConnection *conn,
NBDExportInfo *info,
} else {
error_propagate(errp, conn->err);
conn->err = NULL;
- if (conn->sioc && conn->do_negotiation) {
- *ioc = g_steal_pointer(&conn->ioc);
+ if (!conn->sioc) {
+ return NULL;
+ }
+ if (conn->do_negotiation) {
+ ioc = g_steal_pointer(&conn->ioc);
memcpy(info, &conn->updated_info, sizeof(*info));
}
- return g_steal_pointer(&conn->sioc);
+ if (ioc) {
+ /* TLS channel now has own reference to parent */
+ object_unref(OBJECT(conn->sioc));
+ } else {
+ ioc = QIO_CHANNEL(conn->sioc);
+ }
+ conn->sioc = NULL;
+ return ioc;
}
}
--
2.31.1
- [PULL 22/34] nbd/client-connection: implement connection retry, (continued)
- [PULL 22/34] nbd/client-connection: implement connection retry, Eric Blake, 2021/06/15
- [PULL 20/34] nbd/client-connection: use QEMU_LOCK_GUARD, Eric Blake, 2021/06/15
- [PULL 21/34] nbd/client-connection: add possibility of negotiation, Eric Blake, 2021/06/15
- [PULL 19/34] nbd: move connection code from block/nbd to nbd/client-connection, Eric Blake, 2021/06/15
- [PULL 23/34] nbd/client-connection: shutdown connection on release, Eric Blake, 2021/06/15
- [PULL 25/34] block/nbd: use negotiation of NBDClientConnection, Eric Blake, 2021/06/15
- [PULL 26/34] block/nbd: don't touch s->sioc in nbd_teardown_connection(), Eric Blake, 2021/06/15
- [PULL 24/34] block/nbd: split nbd_handle_updated_info out of nbd_client_handshake(), Eric Blake, 2021/06/15
- [PULL 27/34] block/nbd: drop BDRVNBDState::sioc, Eric Blake, 2021/06/15
- [PULL 30/34] block/nbd: split nbd_co_do_establish_connection out of nbd_reconnect_attempt, Eric Blake, 2021/06/15
- [PULL 28/34] nbd/client-connection: return only one io channel,
Eric Blake <=
- [PULL 31/34] nbd/client-connection: add option for non-blocking connection attempt, Eric Blake, 2021/06/15
- [PULL 29/34] block-coroutine-wrapper: allow non bdrv_ prefix, Eric Blake, 2021/06/15
- [PULL 33/34] block/nbd: add nbd_client_connected() helper, Eric Blake, 2021/06/15
- [PULL 32/34] block/nbd: reuse nbd_co_do_establish_connection() in nbd_open(), Eric Blake, 2021/06/15
- [PULL 34/34] block/nbd: safer transition to receiving request, Eric Blake, 2021/06/15
- Re: [PULL 00/34] NBD patches for 2021-06-15, Peter Maydell, 2021/06/17