[PATCH] xfs: ensure we capture IO errors correctly

[Mark Tinguely]

On 03/07/13 20:01, Dave Chinner wrote:
> From: Dave Chinner<dchinner at redhat.com>
>
> Failed buffer readahead can leave the buffer in the cache marked
> with an error. Most callers that then issue a subsequent read on the
> buffer do not zero the b_error field out, and so we may incorectly
> detect an error during IO completion due to the stale error value
> left on the buffer.
>
> Avoid this problem by zeroing the error before IO submission. This
> ensures that the only IO errors that are detected those captured
> from are those captured from bio submission or completion.
>
> Signed-off-by: Dave Chinner<dchinner at redhat.com>
> ---

Looks good.

Reviewed-by: Mark Tinguely <tinguely at sgi.com>