Re: [Qemu-devel] [PATCH 10/16] block/parallels: add get_block_status

["Denis V. Lunev" <den@openvz.org>]

On 15/12/14 11:27, Denis V. Lunev wrote:
> From: Roman Kagan <rkagan@parallels.com>
>
> Implement VFS method for get_block_status to Parallels format driver.
>
> Signed-off-by: Roman Kagan <rkagan@parallels.com>
> Signed-off-by: Denis V. Lunev <den@openvz.org>
> CC: Jeff Cody <jcody@redhat.com>
> CC: Kevin Wolf <kwolf@redhat.com>
> CC: Stefan Hajnoczi <stefanha@redhat.com>
> ---
>   block/parallels.c | 21 +++++++++++++++++++++
>   1 file changed, 21 insertions(+)
>
> diff --git a/block/parallels.c b/block/parallels.c
> index a05bf39..2d3e962 100644
> --- a/block/parallels.c
> +++ b/block/parallels.c
> @@ -384,6 +384,26 @@ static int cluster_remainder(BDRVParallelsState *s, int64_t sector_num,
>       return MIN(nb_sectors, ret);
>   }
>   
> +static int64_t coroutine_fn parallels_co_get_block_status(BlockDriverState *bs,
> +        int64_t sector_num, int nb_sectors, int *pnum)
> +{
> +    BDRVParallelsState *s = bs->opaque;
> +    int64_t offset;
> +
> +    qemu_co_mutex_lock(&s->lock);
> +    offset = seek_to_sector(s, sector_num);
I have mistaken here at porting Roman's changes
on top of my changes. "padding" is not applied here
while it should.

Shame on me :(

Something safe should be invented to avoid this
mess.

> +    qemu_co_mutex_unlock(&s->lock);
> +
> +    *pnum = cluster_remainder(s, sector_num, nb_sectors);
> +
> +    if (offset < 0) {
> +        return 0;
> +    }
> +
> +    return (offset << BDRV_SECTOR_BITS) |
> +        BDRV_BLOCK_DATA | BDRV_BLOCK_OFFSET_VALID;
> +}
> +
>   static int parallels_read(BlockDriverState *bs, int64_t sector_num,
>                       uint8_t *buf, int nb_sectors)
>   {
> @@ -433,6 +453,7 @@ static BlockDriver bdrv_parallels = {
>       .bdrv_open		= parallels_open,
>       .bdrv_read          = parallels_co_read,
>       .bdrv_close		= parallels_close,
> +    .bdrv_co_get_block_status = parallels_co_get_block_status,
>   };
>   
>   static void bdrv_parallels_init(void)