Re: [Qemu-devel] [PATCH V18 1/6] docs: document for add-cow file format

[Dong Xu Wang]

On 2013/4/18 16:30, Stefan Hajnoczi wrote:
> On Wed, Apr 10, 2013 at 04:11:48PM +0800, Dong Xu Wang wrote:
> > +The Header is included in the first bytes:
> > +(HEADER_SIZE is defined in 40-43 bytes.)
> > +    Byte    0  -  3:    magic
> > +                        add-cow magic string ("ACOW").
> > +
> > +            4  -  7:    backing file name offset
> > +                        Offset in the add-cow file at which the backing
> > +                        file name is stored (NB: The string is not
> > +                        lNUL-terminated).
>
> s/lNUL/NUL/
Okay.
> > +            24 - 31:    features
> > +                        Bitmask of features. If a feature bit is set
> > +                        but not recognized, the add-cow file should be
> > +                        dropped. They are not used in now.
>
> "If a feature bit is set but not recognized, the opening the add-cow file must fail. 
>  No features bits are currently defined."
Okay.
>