From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:57467) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Z1rbV-0003H6-Vp for qemu-devel@nongnu.org; Mon, 08 Jun 2015 03:36:19 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1Z1rbR-000197-2f for qemu-devel@nongnu.org; Mon, 08 Jun 2015 03:36:17 -0400 Received: from e06smtp12.uk.ibm.com ([195.75.94.108]:60786) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Z1rbQ-0000zi-QC for qemu-devel@nongnu.org; Mon, 08 Jun 2015 03:36:13 -0400 Received: from /spool/local by e06smtp12.uk.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Mon, 8 Jun 2015 08:36:10 +0100 Message-ID: <557545E3.9000504@de.ibm.com> Date: Mon, 08 Jun 2015 09:36:03 +0200 From: Christian Borntraeger MIME-Version: 1.0 References: <1433339175-12300-1-git-send-email-yarygin@linux.vnet.ibm.com> <1433339175-12300-2-git-send-email-yarygin@linux.vnet.ibm.com> In-Reply-To: <1433339175-12300-2-git-send-email-yarygin@linux.vnet.ibm.com> Content-Type: text/plain; charset=iso-8859-15 Content-Transfer-Encoding: 7bit Subject: Re: [Qemu-devel] [PATCH 1/2] block-backend: Introduce blk_drain() and replace blk_drain_all() List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Kevin Wolf , Stefan Hajnoczi Cc: qemu-block@nongnu.org, Alexander Yarygin , Ekaterina Tumanova , qemu-devel@nongnu.org, Cornelia Huck , Paolo Bonzini Am 03.06.2015 um 15:46 schrieb Alexander Yarygin: > Each call of the virtio_blk_reset() function calls blk_drain_all(), > which works for all existing BlockDriverStates, while only one > BlockDriverState needs to be drained. > > This patch introduces the blk_drain() function and replaces > blk_drain_all() on it in virtio_blk_reset(). > > Cc: Christian Borntraeger > Cc: Cornelia Huck > Cc: Kevin Wolf > Cc: Paolo Bonzini > Cc: Stefan Hajnoczi > Signed-off-by: Alexander Yarygin Stefan/Kevin, any opinion on these 2 patches? I would like to have this issue fixed for s390 as having many disks is quite common on s390. > --- > block/block-backend.c | 5 +++++ > hw/block/virtio-blk.c | 2 +- > include/sysemu/block-backend.h | 1 + > 3 files changed, 7 insertions(+), 1 deletion(-) > > diff --git a/block/block-backend.c b/block/block-backend.c > index 93e46f3..aee8a12 100644 > --- a/block/block-backend.c > +++ b/block/block-backend.c > @@ -700,6 +700,11 @@ int blk_flush_all(void) > return bdrv_flush_all(); > } > > +void blk_drain(BlockBackend *blk) > +{ > + bdrv_drain(blk->bs); > +} > + > void blk_drain_all(void) > { > bdrv_drain_all(); > diff --git a/hw/block/virtio-blk.c b/hw/block/virtio-blk.c > index e6afe97..abaca58 100644 > --- a/hw/block/virtio-blk.c > +++ b/hw/block/virtio-blk.c > @@ -660,7 +660,7 @@ static void virtio_blk_reset(VirtIODevice *vdev) > * This should cancel pending requests, but can't do nicely until there > * are per-device request lists. > */ > - blk_drain_all(); > + blk_drain(s->blk); > blk_set_enable_write_cache(s->blk, s->original_wce); > } > > diff --git a/include/sysemu/block-backend.h b/include/sysemu/block-backend.h > index b4a4d5e..8fc960f 100644 > --- a/include/sysemu/block-backend.h > +++ b/include/sysemu/block-backend.h > @@ -118,6 +118,7 @@ int blk_co_discard(BlockBackend *blk, int64_t sector_num, int nb_sectors); > int blk_co_flush(BlockBackend *blk); > int blk_flush(BlockBackend *blk); > int blk_flush_all(void); > +void blk_drain(BlockBackend *blk); > void blk_drain_all(void); > BlockdevOnError blk_get_on_error(BlockBackend *blk, bool is_read); > BlockErrorAction blk_get_error_action(BlockBackend *blk, bool is_read, >