Re: [PATCH 13/21] dma-helpers: replace bdrv_aio_writev() with bdrv_aio_writev_proxy().

Michael S. Tsirkin
2010-11-28T12:29:34Z

On Sun, Nov 28, 2010 at 08:55:28PM +0900, Yoshiaki Tamura wrote:
> 2010/11/28 Michael S. Tsirkin <mst@redhat.com>:
> > On Thu, Nov 25, 2010 at 03:06:52PM +0900, Yoshiaki Tamura wrote:
> >> Replace bdrv_aio_writev() with bdrv_aio_writev_proxy() to let
> >> event-tap capture events from dma-helpers.
> >>
> >> Signed-off-by: Yoshiaki Tamura <tamura.yoshiaki@lab.ntt.co.jp>
> >
> > Same comment as -net here: it's not clear when should
> > a device use bdrv_aio_writev_proxy and when bdrv_aio_writev.
> > If all devices should just use _proxy, let's
> > just make bdrv_aio_writev DTRT instead.
>
> Same as I replied to the net layer question. However, I had
> troubles with inserting event-tap functions into block.c before.
> block.c gets linked with utils like qemu-img, but they don't get
> linked with emulators code which event-tap uses in it. So I want
> to avoid linking block and event-tap for utils, but I guess we
> don't want to use ifdefs for this. I'm wondering how I can solve
> this problem cleanly.

Add stubs same as we have for other functions.

> Kevin, do you have suggestions here?
>
> Yoshi
>
> >
> >> ---
> >>  dma-helpers.c |    4 ++--
> >>  1 files changed, 2 insertions(+), 2 deletions(-)
> >>
> >> diff --git a/dma-helpers.c b/dma-helpers.c
> >> index 712ed89..8ab2c26 100644
> >> --- a/dma-helpers.c
> >> +++ b/dma-helpers.c
> >> @@ -117,8 +117,8 @@ static void dma_bdrv_cb(void *opaque, int ret)
> >>      }
> >>
> >>      if (dbs->is_write) {
> >> -        dbs->acb = bdrv_aio_writev(dbs->bs, dbs->sector_num, &dbs->iov,
> >> -                                   dbs->iov.size / 512, dma_bdrv_cb, dbs);
> >> +        dbs->acb = bdrv_aio_writev_proxy(dbs->bs, dbs->sector_num, &dbs->iov,
> >> +                                         dbs->iov.size / 512, dma_bdrv_cb, dbs);
> >>      } else {
> >>          dbs->acb = bdrv_aio_readv(dbs->bs, dbs->sector_num, &dbs->iov,
> >>                                    dbs->iov.size / 512, dma_bdrv_cb, dbs);
> >> --
> >> 1.7.1.2
> >>
> >> --
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