From 6e40b3bfc7e82823cf4df5f0bf668f56db41e53a Mon Sep 17 00:00:00 2001 From: Alexander Yarygin Date: Wed, 17 Jun 2015 13:37:20 +0300 Subject: [PATCH] virtio-blk: Use blk_drain() to drain IO requests Each call of the virtio_blk_reset() function calls blk_drain_all(), which works for all existing BlockDriverStates, while draining only one is needed. This patch replaces blk_drain_all() by blk_drain() in virtio_blk_reset(). virtio_blk_data_plane_stop() should be called after draining because it restores vblk->complete_request. Cc: "Michael S. Tsirkin" Cc: Christian Borntraeger Cc: Cornelia Huck Cc: Kevin Wolf Cc: Paolo Bonzini Cc: Stefan Hajnoczi Signed-off-by: Alexander Yarygin Message-id: 1434537440-28236-3-git-send-email-yarygin@linux.vnet.ibm.com Signed-off-by: Stefan Hajnoczi --- hw/block/virtio-blk.c | 15 ++++++++++----- 1 file changed, 10 insertions(+), 5 deletions(-) diff --git a/hw/block/virtio-blk.c b/hw/block/virtio-blk.c index cd539aa11c..bbb1fc1877 100644 --- a/hw/block/virtio-blk.c +++ b/hw/block/virtio-blk.c @@ -651,16 +651,21 @@ static void virtio_blk_dma_restart_cb(void *opaque, int running, static void virtio_blk_reset(VirtIODevice *vdev) { VirtIOBlock *s = VIRTIO_BLK(vdev); - - if (s->dataplane) { - virtio_blk_data_plane_stop(s->dataplane); - } + AioContext *ctx; /* * This should cancel pending requests, but can't do nicely until there * are per-device request lists. */ - blk_drain_all(); + ctx = blk_get_aio_context(s->blk); + aio_context_acquire(ctx); + blk_drain(s->blk); + + if (s->dataplane) { + virtio_blk_data_plane_stop(s->dataplane); + } + aio_context_release(ctx); + blk_set_enable_write_cache(s->blk, s->original_wce); } -- 2.30.2