[LTP] [PATCH 2/2] fill_fs: Ensure written data is not easily compressed

[Richard Palethorpe]

Hello,

Cyril Hrubis <chrubis@suse.cz> writes:

> Hi!
>> --- a/lib/tst_fill_fs.c
>> +++ b/lib/tst_fill_fs.c
>> @@ -16,13 +16,20 @@ void tst_fill_fs(const char *path, int verbose)
>>  {
>>  	int i = 0;
>>  	char file[PATH_MAX];
>> -	char buf[4096];
>> +	static char buf[4096];
>
> I'm not sure if caching the random data is worth here, I bet that
> reading the random data would be neglectible to the rest of the write
> operations we do.

I suppose that instead of writing random lengths we could just copy
/dev/urandom to <path> in static chunks of a reasonable size.

Furthermore we can use copy_file_range on newer kernels.

-- 
Thank you,
Richard.