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From cbfaf86331c2b2e01a2083303b7554672bf991b7 Mon Sep 17 00:00:00 2001
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From: Leonardo Bras <leobras@redhat.com>
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Date: Mon, 20 Jun 2022 02:39:42 -0300
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Subject: [PATCH 24/37] QIOChannelSocket: Introduce assert and reduce ifdefs to
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improve readability
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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RH-Author: Leonardo Brás <leobras@redhat.com>
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RH-MergeRequest: 191: MSG_ZEROCOPY + Multifd @ rhel8.7
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RH-Commit: [24/26] b50e2e65307149f247155a7f7a032dc99e57718d
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RH-Bugzilla: 2072049
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RH-Acked-by: Peter Xu <peterx@redhat.com>
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RH-Acked-by: Daniel P. Berrangé <berrange@redhat.com>
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RH-Acked-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
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During implementation of MSG_ZEROCOPY feature, a lot of #ifdefs were
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introduced, particularly at qio_channel_socket_writev().
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Rewrite some of those changes so it's easier to read.
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Also, introduce an assert to help detect incorrect zero-copy usage is when
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it's disabled on build.
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Signed-off-by: Leonardo Bras <leobras@redhat.com>
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Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
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Reviewed-by: Juan Quintela <quintela@redhat.com>
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Reviewed-by: Peter Xu <peterx@redhat.com>
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Signed-off-by: Juan Quintela <quintela@redhat.com>
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Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
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dgilbert: Fixed up thinko'd g_assert_unreachable->g_assert_not_reached
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(cherry picked from commit 803ca43e4c7fcf32f9f68c118301ccd0c83ece3f)
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Signed-off-by: Leonardo Bras <leobras@redhat.com>
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---
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io/channel-socket.c | 14 +++++++++-----
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1 file changed, 9 insertions(+), 5 deletions(-)
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diff --git a/io/channel-socket.c b/io/channel-socket.c
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index 38a46ba213..7d37b39de7 100644
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--- a/io/channel-socket.c
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+++ b/io/channel-socket.c
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@@ -579,11 +579,17 @@ static ssize_t qio_channel_socket_writev(QIOChannel *ioc,
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memcpy(CMSG_DATA(cmsg), fds, fdsize);
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}
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-#ifdef QEMU_MSG_ZEROCOPY
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if (flags & QIO_CHANNEL_WRITE_FLAG_ZERO_COPY) {
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+#ifdef QEMU_MSG_ZEROCOPY
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sflags = MSG_ZEROCOPY;
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- }
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+#else
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+ /*
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+ * We expect QIOChannel class entry point to have
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+ * blocked this code path already
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+ */
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+ g_assert_not_reached();
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#endif
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+ }
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retry:
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ret = sendmsg(sioc->fd, &msg, sflags);
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@@ -593,15 +599,13 @@ static ssize_t qio_channel_socket_writev(QIOChannel *ioc,
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return QIO_CHANNEL_ERR_BLOCK;
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case EINTR:
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goto retry;
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-#ifdef QEMU_MSG_ZEROCOPY
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case ENOBUFS:
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- if (sflags & MSG_ZEROCOPY) {
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+ if (flags & QIO_CHANNEL_WRITE_FLAG_ZERO_COPY) {
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error_setg_errno(errp, errno,
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"Process can't lock enough memory for using MSG_ZEROCOPY");
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return -1;
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}
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break;
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-#endif
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}
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error_setg_errno(errp, errno,
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--
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2.35.3
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