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

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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).

> 



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