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| author | Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com> | 2019-06-18 14:43:21 +0300 |
|---|---|---|
| committer | Eric Blake <eblake@redhat.com> | 2019-08-15 13:22:14 -0500 |
| commit | a8e2bb6a76c7c661c117327f70f06eb628554230 (patch) | |
| tree | 6ea29153f1608699a6014101e3e9c10e353dc66d /block/nbd.c | |
| parent | 962b7b3d4c3aed241ec28ea712ec9079ac98d3ad (diff) | |
| download | qemu-a8e2bb6a76c7c661c117327f70f06eb628554230.zip qemu-a8e2bb6a76c7c661c117327f70f06eb628554230.tar.gz qemu-a8e2bb6a76c7c661c117327f70f06eb628554230.tar.bz2 | |
block/nbd: use non-blocking io channel for nbd negotiation
No reason to use blocking channel for negotiation and we'll benefit in
further reconnect feature, as qio_channel reads and writes will do
qemu_coroutine_yield while waiting for io completion.
Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Message-Id: <20190618114328.55249-3-vsementsov@virtuozzo.com>
Signed-off-by: Eric Blake <eblake@redhat.com>
Diffstat (limited to 'block/nbd.c')
| -rw-r--r-- | block/nbd.c | 16 |
1 files changed, 7 insertions, 9 deletions
diff --git a/block/nbd.c b/block/nbd.c index c16d025..3a243d9 100644 --- a/block/nbd.c +++ b/block/nbd.c @@ -1175,6 +1175,7 @@ static int nbd_client_connect(BlockDriverState *bs, Error **errp) { BDRVNBDState *s = (BDRVNBDState *)bs->opaque; + AioContext *aio_context = bdrv_get_aio_context(bs); int ret; /* @@ -1189,15 +1190,16 @@ static int nbd_client_connect(BlockDriverState *bs, /* NBD handshake */ trace_nbd_client_connect(export); - qio_channel_set_blocking(QIO_CHANNEL(sioc), true, NULL); + 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(x_dirty_bitmap); s->info.name = g_strdup(export ?: ""); - ret = nbd_receive_negotiate(QIO_CHANNEL(sioc), tlscreds, hostname, - &s->ioc, &s->info, errp); + ret = nbd_receive_negotiate(aio_context, QIO_CHANNEL(sioc), tlscreds, + hostname, &s->ioc, &s->info, errp); g_free(s->info.x_dirty_bitmap); g_free(s->info.name); if (ret < 0) { @@ -1231,18 +1233,14 @@ static int nbd_client_connect(BlockDriverState *bs, object_ref(OBJECT(s->ioc)); } - qio_channel_set_blocking(QIO_CHANNEL(sioc), false, NULL); - qio_channel_attach_aio_context(s->ioc, bdrv_get_aio_context(bs)); - trace_nbd_client_connect_success(export); return 0; fail: /* - * We have connected, but must fail for other reasons. The - * connection is still blocking; send NBD_CMD_DISC as a courtesy - * to the server. + * 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 }; |