Re: [PATCH 2/3] virtio-blk: undo destructive iov_discard_*() operations

[Stefan Hajnoczi]

On Wed, Sep 16, 2020 at 11:38:36PM +0800, Li Qiang wrote:
> Stefan Hajnoczi <stefa...@redhat.com> 于2020年8月12日周三 下午6:51写道：
> > @@ -644,7 +648,8 @@ static int virtio_blk_handle_request(VirtIOBlockReq 
> > *req, MultiReqBuffer *mrb)
> >      req->in = (void *)in_iov[in_num - 1].iov_base
> >                + in_iov[in_num - 1].iov_len
> >                - sizeof(struct virtio_blk_inhdr);
> > -    iov_discard_back(in_iov, &in_num, sizeof(struct virtio_blk_inhdr));
> > +    iov_discard_back_undoable(in_iov, &in_num, sizeof(struct 
> > virtio_blk_inhdr),
> > +                              &req->inhdr_undo);
> >
> >      type = virtio_ldl_p(vdev, &req->out.type);
> >
> 
> It seems there is another error path need to do the undo operations.
> case VIRTIO_BLK_T_WRITE_ZEROS & ~VIRTIO_BLK_T_OUT
> handler has an error path.

Yes, thank you! I'll fix it in the next revision.

Stefan

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