[PATCH] xfstests: fix async io error handling in fsx

[Christoph Hellwig]

On Mon, Apr 06, 2009 at 10:26:16AM -0500, Felix Blyakher wrote:
> The result of async io returned in the event.res in addition
> to the number of bytes read/written provides negated error
> number. The broken libaio defines event.res as unsigned
> while the same structure in the kernel defines it as signed.
> The kernel indeed treats it as signed, and returns the
> negated error number. Till libaio is fixed we provide
> the signed long temp var.
> Also set errno for each error condition in aio_rw, as the
> caller is not aio aware and expects ret(-1)+errno by the
> traditional libc convention.

Looks good.

Reviewed-by: Christoph Hellwig <hch at lst.de>