Re: [PATCH 1/2] generic/461: Test RWF_NOWAIT

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On 09/27/2017 04:34 PM, Dave Chinner wrote:
> On Wed, Sep 27, 2017 at 02:10:02PM -0500, Goldwyn Rodrigues wrote:
>> From: Goldwyn Rodrigues <rgoldwyn@xxxxxxxx>
>>
>> Tests the RWF_NOWAIT flag so the I/O returns immediately on
>> a new file, without any block allocations.
>>
>> A new program which includes the pwritev2() call is used. This allows
>> passing flags for the I/O to be performed.
> 
> Rather than write a one-off test program for this that effectively
> replicates xfs_io pread/pwrite functionality, please add RWF_NOWAIT
> flag support to xfs_io.
> 

This one off program is required because xfs_io does not support partial
writes. It tries to do that within the loop and does not return the
number of bytes written. This is required for test generic/462.

-- 
Goldwyn
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