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Re: [Qemu-devel] [PATCH v9 03/10] virtio-blk: don't use pointer for conf
From: |
Kevin Wolf |
Subject: |
Re: [Qemu-devel] [PATCH v9 03/10] virtio-blk: don't use pointer for configuration. |
Date: |
Mon, 18 Mar 2013 09:59:43 +0100 |
User-agent: |
Mutt/1.5.21 (2010-09-15) |
Am 15.03.2013 um 19:48 hat address@hidden geschrieben:
> From: KONRAD Frederic <address@hidden>
>
> The configuration field must not be a pointer as it will be used for
> virtio-blk
> properties. So *blk is replaced by blk in VirtIOBlock structure.
>
> Signed-off-by: KONRAD Frederic <address@hidden>
> Reviewed-by: Peter Maydell <address@hidden>
> ---
> hw/virtio-blk.c | 8 ++++----
> hw/virtio-blk.h | 2 +-
> 2 files changed, 5 insertions(+), 5 deletions(-)
>
> diff --git a/hw/virtio-blk.c b/hw/virtio-blk.c
> index 6714b01..908c316 100644
> --- a/hw/virtio-blk.c
> +++ b/hw/virtio-blk.c
> @@ -151,7 +151,7 @@ static void virtio_blk_handle_scsi(VirtIOBlockReq *req)
> */
> req->scsi = (void *)req->elem.in_sg[req->elem.in_num - 2].iov_base;
>
> - if (!req->dev->blk->scsi) {
> + if (!req->dev->blk.scsi) {
> status = VIRTIO_BLK_S_UNSUPP;
> goto fail;
> }
> @@ -371,7 +371,7 @@ static void virtio_blk_handle_request(VirtIOBlockReq *req,
> * terminated by '\0' only when shorter than buffer.
> */
> strncpy(req->elem.in_sg[0].iov_base,
> - s->blk->serial ? s->blk->serial : "",
> + s->blk.serial ? s->blk.serial : "",
> MIN(req->elem.in_sg[0].iov_len, VIRTIO_BLK_ID_BYTES));
> virtio_blk_req_complete(req, VIRTIO_BLK_S_OK);
> g_free(req);
> @@ -534,7 +534,7 @@ static uint32_t virtio_blk_get_features(VirtIODevice
> *vdev, uint32_t features)
> features |= (1 << VIRTIO_BLK_F_BLK_SIZE);
> features |= (1 << VIRTIO_BLK_F_SCSI);
>
> - if (s->blk->config_wce) {
> + if (s->blk.config_wce) {
> features |= (1 << VIRTIO_BLK_F_CONFIG_WCE);
> }
> if (bdrv_enable_write_cache(s->bs))
> @@ -650,7 +650,7 @@ VirtIODevice *virtio_blk_init(DeviceState *dev,
> VirtIOBlkConf *blk)
> s->vdev.reset = virtio_blk_reset;
> s->bs = blk->conf.bs;
> s->conf = &blk->conf;
> - s->blk = blk;
> + memcpy(&(s->blk), blk, sizeof(struct VirtIOBlkConf));
Why not simply s->blk = *blk?
The reason why copying this works is that blk is read-only after
initialisation. We also get an additional reference to blk->serial, but
we know that it can only go away after this device has been destroyed
(the same assumption was necessary for the s->blk pointer in the old
code).
Is my understanding of this correct?
Kevin
- [Qemu-devel] [PATCH v9 00/10] virtio-blk refactoring., fred . konrad, 2013/03/15
- [Qemu-devel] [PATCH v9 04/10] virtio-blk: add the virtio-blk device., fred . konrad, 2013/03/15
- [Qemu-devel] [PATCH v9 06/10] virtio-blk-s390: switch to the new API., fred . konrad, 2013/03/15
- [Qemu-devel] [PATCH v9 05/10] virtio-blk-pci: switch to new API., fred . konrad, 2013/03/15
- [Qemu-devel] [PATCH v9 09/10] virtio-blk: cleanup: QOM cast, fred . konrad, 2013/03/15
- [Qemu-devel] [PATCH v9 07/10] virtio-blk-ccw switch to new API., fred . konrad, 2013/03/15
- [Qemu-devel] [PATCH v9 08/10] virtio-blk: cleanup: init and exit functions., fred . konrad, 2013/03/15
- [Qemu-devel] [PATCH v9 10/10] virtio-blk: cleanup: remove qdev field., fred . konrad, 2013/03/15