Re: [Qemu-devel] [Qemu-block] [PATCH] block/vhdx: Use IEC binary prefixes from "qemu/units.h"

[Stefano Garzarella]

On Mon, Mar 25, 2019 at 10:56:57PM +0100, Philippe Mathieu-Daudé wrote:
> Le lun. 25 mars 2019 21:53, John Snow <address@hidden> a écrit :
> > On 3/21/19 5:40 AM, Stefano Garzarella wrote:
> > > IEC binary prefixes are defined in "qemu/units.h", so we
> > > can remove redundant definitions in "block/vhdx.h".
> > >
> > > Signed-off-by: Stefano Garzarella <address@hidden>
> > > ---
> > >  block/vhdx-log.c | 1 +
> > >  block/vhdx.c     | 4 +++-
> > >  block/vhdx.h     | 5 -----
> > >  3 files changed, 4 insertions(+), 6 deletions(-)
> > >
> > > diff --git a/block/vhdx-log.c b/block/vhdx-log.c
> > > index 3149ff08d8..ad9905eb6d 100644
> > > --- a/block/vhdx-log.c
> > > +++ b/block/vhdx-log.c
> > > @@ -18,6 +18,7 @@
> > >   *
> > >   */
> > >  #include "qemu/osdep.h"
> > > +#include "qemu/units.h"
> > >  #include "qapi/error.h"
> > >  #include "qemu-common.h"
> > >  #include "block/block_int.h"
> > > diff --git a/block/vhdx.c b/block/vhdx.c
> > > index b785aef4b7..e9b16c5ef6 100644
> > > --- a/block/vhdx.c
> > > +++ b/block/vhdx.c
> > > @@ -16,6 +16,7 @@
> > >   */
> > >
> > >  #include "qemu/osdep.h"
> > > +#include "qemu/units.h"
> > >  #include "qapi/error.h"
> > >  #include "block/block_int.h"
> > >  #include "block/qdict.h"
> > > @@ -1889,7 +1890,8 @@ static int coroutine_fn
> > vhdx_co_create(BlockdevCreateOptions *opts,
> > >          return -EINVAL;
> > >      }
> > >      if (block_size > VHDX_BLOCK_SIZE_MAX) {
> > > -        error_setg(errp, "Block size must not exceed %d",
> > VHDX_BLOCK_SIZE_MAX);
> > > +        error_setg(errp, "Block size must not exceed %" PRId64,
> > > +                   VHDX_BLOCK_SIZE_MAX);
> >
> > Oh, changing the constants changes the inferred type of this constant,
> > correct?
> >
> 

Yes, in "units.h" all the constants are int64_t.

> Yes.
> 
> 
> > >          return -EINVAL;
> > >      }
> > >
> > > diff --git a/block/vhdx.h b/block/vhdx.h
> > > index 1bfb4e4f73..deb6e362ad 100644
> > > --- a/block/vhdx.h
> > > +++ b/block/vhdx.h
> > > @@ -18,11 +18,6 @@
> > >  #ifndef BLOCK_VHDX_H
> > >  #define BLOCK_VHDX_H
> > >
> > > -#define KiB              (1 * 1024)
> > > -#define MiB            (KiB * 1024)
> > > -#define GiB            (MiB * 1024)
> > > -#define TiB ((uint64_t) GiB * 1024)
> > > -
> >
> > I'd include units.h here because there are other references to
> > KiB/MiB/GiB and so on throughout the rest of this header file.
> >
> > I think it's bad form to have a header that cannot be included unless
> > you include other headers manually alongside it.
> >
> 
> Agreed.

Okay, I'll include units.h here.

> 
> 
> > >  #define DEFAULT_LOG_SIZE 1048576 /* 1MiB */
> >
> 
> Can we also update this definition?
> 

Sure, I'll update it in v2.


Thanks for the review,
Stefano