On Fri, May 27, 2022 at 11:02:46AM +0200, Florian Weimer wrote:
> * Eric Biggers:
> 
> > diff --git a/include/uapi/linux/stat.h b/include/uapi/linux/stat.h
> > index 1500a0f58041a..f822b23e81091 100644
> > --- a/include/uapi/linux/stat.h
> > +++ b/include/uapi/linux/stat.h
> > @@ -124,9 +124,13 @@ struct statx {
> >     __u32   stx_dev_minor;
> >     /* 0x90 */
> >     __u64   stx_mnt_id;
> > -   __u64   __spare2;
> > +   __u32   stx_mem_align_dio;      /* Memory buffer alignment for direct 
> > I/O */
> > +   __u32   stx_offset_align_dio;   /* File offset alignment for direct I/O 
> > */
> >     /* 0xa0 */
> > -   __u64   __spare3[12];   /* Spare space for future expansion */
> > +   __u32   stx_offset_align_optimal; /* Optimal file offset alignment for 
> > I/O */
> > +   __u32   __spare2;
> > +   /* 0xa8 */
> > +   __u64   __spare3[11];   /* Spare space for future expansion */
> >     /* 0x100 */
> >  };
> 
> Are 32 bits enough?  Would it make sense to store the base-2 logarithm
> instead?

I don't think a log2 will work here, XFS will want to report things like
raid stripe sizes, which can be any multiple of the fs blocksize.

32 bits is probably enough, seeing as the kernel won't do an IO larger
than 2GB anyway.

--D

> Thanks,
> Florian
> 


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