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From: Wei Liu <wei.liu2@citrix.com>
To: Wen Congyang <wency@cn.fujitsu.com>
Cc: Ian Jackson <ian.jackson@eu.citrix.com>,
	Andrew Cooper <andrew.cooper3@citrix.com>,
	Wei Liu <wei.liu2@citrix.com>,
	Ian Campbell <ian.campbell@citrix.com>,
	xen devel <xen-devel@lists.xen.org>
Subject: Re: [PATCH v4 3/3] libxl: rename checkpointed_stream to stream_type
Date: Tue, 15 Mar 2016 12:54:38 +0000	[thread overview]
Message-ID: <20160315125438.GD31759@citrix.com> (raw)
In-Reply-To: <1458007117-22697-3-git-send-email-wency@cn.fujitsu.com>

On Tue, Mar 15, 2016 at 09:58:37AM +0800, Wen Congyang wrote:
> Signed-off-by: Wen Congyang <wency@cn.fujitsu.com>
> ---
> v3->v4: Remove the new macro, and updte the macro LIBXL_HAVE_CHECKPOINTED_STREAM
>  tools/libxl/libxl.c              |  4 ++--
>  tools/libxl/libxl.h              |  4 +++-
>  tools/libxl/libxl_create.c       |  4 ++--
>  tools/libxl/libxl_dom_save.c     |  6 +++---
>  tools/libxl/libxl_internal.h     |  2 +-
>  tools/libxl/libxl_save_callout.c |  4 ++--
>  tools/libxl/libxl_stream_read.c  |  4 ++--
>  tools/libxl/libxl_stream_write.c |  2 +-
>  tools/libxl/libxl_types.idl      |  2 +-
>  tools/libxl/xl_cmdimpl.c         | 16 ++++++++--------
>  10 files changed, 25 insertions(+), 23 deletions(-)
> 
> diff --git a/tools/libxl/libxl.c b/tools/libxl/libxl.c
> index 93e228d..7579dd2 100644
> --- a/tools/libxl/libxl.c
> +++ b/tools/libxl/libxl.c
> @@ -876,7 +876,7 @@ int libxl_domain_remus_start(libxl_ctx *ctx, libxl_domain_remus_info *info,
>      dss->live = 1;
>      dss->debug = 0;
>      dss->remus = info;
> -    dss->checkpointed_stream = LIBXL_CHECKPOINTED_STREAM_REMUS;
> +    dss->stream_type = LIBXL_CHECKPOINTED_STREAM_REMUS;
>  
>      assert(info);
>  
> @@ -937,7 +937,7 @@ int libxl_domain_suspend(libxl_ctx *ctx, uint32_t domid, int fd, int flags,
>      dss->type = type;
>      dss->live = flags & LIBXL_SUSPEND_LIVE;
>      dss->debug = flags & LIBXL_SUSPEND_DEBUG;
> -    dss->checkpointed_stream = LIBXL_CHECKPOINTED_STREAM_NONE;
> +    dss->stream_type = LIBXL_CHECKPOINTED_STREAM_NONE;
>  
>      rc = libxl__fd_flags_modify_save(gc, dss->fd,
>                                       ~(O_NONBLOCK|O_NDELAY), 0,
> diff --git a/tools/libxl/libxl.h b/tools/libxl/libxl.h
> index f9e3ef5..c55094b 100644
> --- a/tools/libxl/libxl.h
> +++ b/tools/libxl/libxl.h
> @@ -879,7 +879,9 @@ void libxl_mac_copy(libxl_ctx *ctx, libxl_mac *dst, libxl_mac *src);
>  /*
>   * LIBXL_HAVE_CHECKPOINTED_STREAM
>   *
> - * If this is defined, then libxl_checkpointed_stream exists.
> + * If this is defined, then libxl_checkpointed_stream exists, and the
> + * libxl_domain_create_restore() interface's parameter checkpointed_stream
> + * is renamed to stream_type
>   */
>  #define LIBXL_HAVE_CHECKPOINTED_STREAM 1

I just realised this patch have not provided compatibility shim for
older version of LIBXL_API.

It now breaks backward compatibility because it changes existing API.
It's my fault for not observing this earlier, sorry.

On the other hand, I don't think this patch is strictly necessary.
Andrew's original complain was about libxc not exporting XC_MIG_* types.
I think libxl can function just fine as is with the old name.

So if you really wish to change the name of that field, I'm afraid
compatibility shim for all functions that accept
libxl_domain_restore_params is required.

I suggest we drop this patch for now and focus on core COLO
functionality, what do you think?

Wei.

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  reply	other threads:[~2016-03-15 12:54 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-03-15  1:58 [PATCH v4 1/3] libxc: move migration_stream's definition to xenguest.h Wen Congyang
2016-03-15  1:58 ` [PATCH v4 2/3] tools: change checkpointed_stream's type from int to xc_migration_stream_t Wen Congyang
2016-03-17 13:53   ` Ian Jackson
2016-03-15  1:58 ` [PATCH v4 3/3] libxl: rename checkpointed_stream to stream_type Wen Congyang
2016-03-15 12:54   ` Wei Liu [this message]
2016-03-16  1:08     ` Wen Congyang

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