Re: [RFC PATCH v3 03/12] fs: add RWF_ENCODED for reading/writing compressed data

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On Wed, Nov 27, 2019 at 11:00:15AM +0200, Nikolay Borisov wrote:
> 
> 
> On 26.11.19 г. 19:36 ч., Omar Sandoval wrote:
> > On Tue, Nov 26, 2019 at 03:53:02PM +0200, Nikolay Borisov wrote:
> >>
> >>
> >> On 20.11.19 г. 20:24 ч., Omar Sandoval wrote:
> >>> From: Omar Sandoval <osandov@xxxxxx>
> >>
> >> <snip>
> >>
> >>>  
> >>> +enum {
> >>> +	ENCODED_IOV_COMPRESSION_NONE,
> >>> +#define ENCODED_IOV_COMPRESSION_NONE ENCODED_IOV_COMPRESSION_NONE
> >>> +	ENCODED_IOV_COMPRESSION_ZLIB,
> >>> +#define ENCODED_IOV_COMPRESSION_ZLIB ENCODED_IOV_COMPRESSION_ZLIB
> >>> +	ENCODED_IOV_COMPRESSION_LZO,
> >>> +#define ENCODED_IOV_COMPRESSION_LZO ENCODED_IOV_COMPRESSION_LZO
> >>> +	ENCODED_IOV_COMPRESSION_ZSTD,
> >>> +#define ENCODED_IOV_COMPRESSION_ZSTD ENCODED_IOV_COMPRESSION_ZSTD
> >>> +	ENCODED_IOV_COMPRESSION_TYPES = ENCODED_IOV_COMPRESSION_ZSTD,
> >>
> >> This looks very dodgy, what am I missing?
> > 
> > This is a somewhat common trick so that enum values can be checked for
> > with ifdef/ifndef. See include/uapi/linux.in.h, for example.
> 
> I cannot seem to have this file on my system (or any .in.h file for that
> matter in the kernel source dir).

Whoops, that should be include/uapi/linux/in.h



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