[v2,8/8] block: Remove unused sector-based vectored I/O

We are gradually moving away from sector-based interfaces, towards
byte-based.  Now that all callers of vectored I/O have been converted
to use our preferred byte-based bdrv_co_p{read,write}v(), we can
delete the unused bdrv_co_{read,write}v().

Furthermore, this gets rid of the signature difference between the
public bdrv_co_writev() and the callback .bdrv_co_writev (the
latter still exists, because some drivers still need more work
before they are fully byte-based).

Signed-off-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
---
v2: commit typo fix [Kashyap]
---
 include/block/block.h |  4 ----
 block/io.c            | 36 ------------------------------------
 2 files changed, 40 deletions(-)

On Thu, May 31, 2018 at 03:50:46PM -0500, Eric Blake wrote:
> We are gradually moving away from sector-based interfaces, towards
> byte-based.  Now that all callers of vectored I/O have been converted
> to use our preferred byte-based bdrv_co_p{read,write}v(), we can
> delete the unused bdrv_co_{read,write}v().
> 
> Furthermore, this gets rid of the signature difference between the
> public bdrv_co_writev() and the callback .bdrv_co_writev (the
> latter still exists, because some drivers still need more work
> before they are fully byte-based).
> 
> Signed-off-by: Eric Blake <eblake@redhat.com>
> Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>

Reviewed-by: Jeff Cody <jcody@redhat.com>

> ---
> v2: commit typo fix [Kashyap]
> ---
>  include/block/block.h |  4 ----
>  block/io.c            | 36 ------------------------------------
>  2 files changed, 40 deletions(-)
> 
> diff --git a/include/block/block.h b/include/block/block.h
> index 3894edda9de..fe40d2929ac 100644
> --- a/include/block/block.h
> +++ b/include/block/block.h
> @@ -285,10 +285,6 @@ int bdrv_pwrite(BdrvChild *child, int64_t offset, const void *buf, int bytes);
>  int bdrv_pwritev(BdrvChild *child, int64_t offset, QEMUIOVector *qiov);
>  int bdrv_pwrite_sync(BdrvChild *child, int64_t offset,
>                       const void *buf, int count);
> -int coroutine_fn bdrv_co_readv(BdrvChild *child, int64_t sector_num,
> -                               int nb_sectors, QEMUIOVector *qiov);
> -int coroutine_fn bdrv_co_writev(BdrvChild *child, int64_t sector_num,
> -                               int nb_sectors, QEMUIOVector *qiov);
>  /*
>   * Efficiently zero a region of the disk image.  Note that this is a regular
>   * I/O request like read or write and should have a reasonable size.  This
> diff --git a/block/io.c b/block/io.c
> index ca96b487eb8..1d86bfc0072 100644
> --- a/block/io.c
> +++ b/block/io.c
> @@ -1341,24 +1341,6 @@ int coroutine_fn bdrv_co_preadv(BdrvChild *child,
>      return ret;
>  }
> 
> -static int coroutine_fn bdrv_co_do_readv(BdrvChild *child,
> -    int64_t sector_num, int nb_sectors, QEMUIOVector *qiov,
> -    BdrvRequestFlags flags)
> -{
> -    if (nb_sectors < 0 || nb_sectors > BDRV_REQUEST_MAX_SECTORS) {
> -        return -EINVAL;
> -    }
> -
> -    return bdrv_co_preadv(child, sector_num << BDRV_SECTOR_BITS,
> -                          nb_sectors << BDRV_SECTOR_BITS, qiov, flags);
> -}
> -
> -int coroutine_fn bdrv_co_readv(BdrvChild *child, int64_t sector_num,
> -                               int nb_sectors, QEMUIOVector *qiov)
> -{
> -    return bdrv_co_do_readv(child, sector_num, nb_sectors, qiov, 0);
> -}
> -
>  static int coroutine_fn bdrv_co_do_pwrite_zeroes(BlockDriverState *bs,
>      int64_t offset, int bytes, BdrvRequestFlags flags)
>  {
> @@ -1801,24 +1783,6 @@ out:
>      return ret;
>  }
> 
> -static int coroutine_fn bdrv_co_do_writev(BdrvChild *child,
> -    int64_t sector_num, int nb_sectors, QEMUIOVector *qiov,
> -    BdrvRequestFlags flags)
> -{
> -    if (nb_sectors < 0 || nb_sectors > BDRV_REQUEST_MAX_SECTORS) {
> -        return -EINVAL;
> -    }
> -
> -    return bdrv_co_pwritev(child, sector_num << BDRV_SECTOR_BITS,
> -                           nb_sectors << BDRV_SECTOR_BITS, qiov, flags);
> -}
> -
> -int coroutine_fn bdrv_co_writev(BdrvChild *child, int64_t sector_num,
> -    int nb_sectors, QEMUIOVector *qiov)
> -{
> -    return bdrv_co_do_writev(child, sector_num, nb_sectors, qiov, 0);
> -}
> -
>  int coroutine_fn bdrv_co_pwrite_zeroes(BdrvChild *child, int64_t offset,
>                                         int bytes, BdrvRequestFlags flags)
>  {
> -- 
> 2.14.3
> 
>