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Date: Fri, 24 Jul 2015 12:49:46 +0200
From: Christoph Hellwig <hch@lst.de>
To: Jens Axboe <axboe@kernel.dk>
Cc: "Martin K. Petersen" <martin.petersen@oracle.com>,
        Neil Brown <neilb@suse.de>, Liu Bo <bo.li.liu@oracle.com>,
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Subject: Re: [PATCH] block: add a bi_error field to struct bio
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On Wed, Jul 22, 2015 at 03:59:46PM -0600, Jens Axboe wrote:
> One possible solution would be to shrink bi_flags to an unsigned int, no 
> problems fitting that in. Then we could stuff bi_error in that (new) hole, 
> and we would end up having the same size again.

As long as we use set/test/clear_bt on bi_flags that won't work unfortunately.