Re: [Qemu-devel] [PATCH 1/2] linux aio: support flush operation

[Kevin Wolf]

Am 28.07.2011 14:15, schrieb Christoph Hellwig:
>> Christoph, on another note: Can we rely on Linux AIO never returning
>> short writes except on EOF? Currently we return -EINVAL in this case, so

"short reads" I meant, of course.

>> I hope it's true or we wouldn't return the correct error code.
> 
> More or less.  There's one corner case for all Linux I/O, and that is
> only writes up to INT_MAX are supported, and larger writes (and reads)
> get truncated to it.  It's pretty nasty, but Linux has been vocally
> opposed to fixing this issue.

I think we can safely ignore this. So just replacing the current
ret = -EINVAL; by a memset(buf + ret, 0, len - ret); ret = 0; should be
okay, right? (Of course using the qiov versions, but you get the idea)

Kevin