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QIOChannelSocket: Fix zero-copy send so socket flush works

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Somewhere between v6 and v7 the of the zero-copy-send patchset a crucial
part of the flushing mechanism got missing: incrementing zero_copy_queued.

Without that, the flushing interface becomes a no-op, and there is no
guarantee the buffer is really sent.

This can go as bad as causing a corruption in RAM during migration.

Fixes: 2bc58ffc29 ("QIOChannelSocket: Implement io_writev zero copy flag & io_flush for CONFIG_LINUX")
Reported-by: 徐闯 <xuchuangxclwt@bytedance.com>
Signed-off-by: Leonardo Bras <leobras@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Reviewed-by: Peter Xu <peterx@redhat.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
This commit is contained in:
Leonardo Bras 2022-06-20 02:39:43 -03:00 committed by Dr. David Alan Gilbert
parent 803ca43e4c
commit 4f5a09714c
1 changed files with 5 additions and 0 deletions
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5
io/channel-socket.c
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@ -611,6 +611,11 @@ static ssize_t qio_channel_socket_writev(QIOChannel *ioc,
"Unable to write to socket"); "Unable to write to socket");
return -1; return -1;
} }
if (flags & QIO_CHANNEL_WRITE_FLAG_ZERO_COPY) {
sioc->zero_copy_queued++;
}
return ret; return ret;
} }
#else /* WIN32 */ #else /* WIN32 */