Re: [Qemu-devel] [PATCH v20 07/10] Introduce new APIs to do replication operation

[Changlong Xie]

On 06/08/2016 09:41 PM, Eric Blake wrote:
> On 06/07/2016 07:11 PM, Changlong Xie wrote:
> > Signed-off-by: Wen Congyang <address@hidden>
> > Signed-off-by: zhanghailiang <address@hidden>
> > Signed-off-by: Gonglei <address@hidden>
> > Signed-off-by: Changlong Xie <address@hidden>
>
> No mention of the API names in the commit message?  Grepping 'git log'
> is easier if there is something useful to grep for.

I'll use a brief description, such as below:

This commit introduces six replication interfaces(for block, network 
etc). Firstly we can use replication_(new/remove) to create/destroy 
replication instances, then in migration we can use 
replication_(start/stop/do_checkpoint/get_error)_all to handle all 
replication operations. More detail please refer to replication.h

> > ---
> >   Makefile.objs        |   1 +
> >   qapi/block-core.json |  13 ++++
> >   replication.c        | 105 ++++++++++++++++++++++++++++++
> >   replication.h        | 176 +++++++++++++++++++++++++++++++++++++++++++++++++++
> >   4 files changed, 295 insertions(+)
> >   create mode 100644 replication.c
> >   create mode 100644 replication.h
>
> > +++ b/qapi/block-core.json
> > @@ -2032,6 +2032,19 @@
> >               '*read-pattern': 'QuorumReadPattern' } }
> >
> >   ##
> > +# @ReplicationMode
> > +#
> > +# An enumeration of replication modes.
> > +#
> > +# @primary: Primary mode, the vm's state will be sent to secondary QEMU.
> > +#
> > +# @secondary: Secondary mode, receive the vm's state from primary QEMU.
> > +#
> > +# Since: 2.7
> > +##
> > +{ 'enum' : 'ReplicationMode', 'data' : [ 'primary', 'secondary' ] }
> > +
>
> This part is fine, from an interface point of view. However, I have not
> closely reviewed the rest of the patch or series.  That said, here's
> some quick things that caught my eye.

Appreciate.

> > +++ b/replication.c
> > @@ -0,0 +1,105 @@
> > +/*
> > + * Replication filter
> > + *
> > + * Copyright (c) 2016 HUAWEI TECHNOLOGIES CO., LTD.
> > + * Copyright (c) 2016 Intel Corporation
> > + * Copyright (c) 2016 FUJITSU LIMITED
> > + *
> > + * Author:
> > + *   Changlong Xie <address@hidden>
> > + *
> > + * This work is licensed under the terms of the GNU GPL, version 2 or later.
> > + * See the COPYING file in the top-level directory.
> > + */
> > +
> > +#include "replication.h"
>
> All new .c files must include "qemu/osdep.h" first.
>
>
> > +++ b/replication.h
> > @@ -0,0 +1,176 @@
> > +/*
> > + * Replication filter
> > + *
> > + * Copyright (c) 2016 HUAWEI TECHNOLOGIES CO., LTD.
> > + * Copyright (c) 2016 Intel Corporation
> > + * Copyright (c) 2016 FUJITSU LIMITED
> > + *
> > + * Author:
> > + *   Changlong Xie <address@hidden>
> > + *
> > + * This work is licensed under the terms of the GNU GPL, version 2 or later.
> > + * See the COPYING file in the top-level directory.
> > + */
> > +
> > +#ifndef REPLICATION_H
> > +#define REPLICATION_H
> > +
> > +#include "qemu/osdep.h"
>
> And .h files must NOT include osdep.h.
>
> > +#include "qapi/error.h"
>
> Do you really need the full error.h, or is typedefs.h enough to get the
> forward declaration of Error?

It's for error_propagate() in replication.c, and in summary to your 
comments on replication.h/replication.c, i'll
1) remove all uncorrelated *.h in replication.h
2) use following header files in replication.c

#include "qemu/osdep.h"
#include "qapi/error.h"
#include "qemu/queue.h"
#include "replication.h"

Thanks
>