linux-kernel - add a bi_error field to struct bio V3

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Message-Id: <1437398977-8492-1-git-send-email-hch@lst.de>
Date:	Mon, 20 Jul 2015 15:29:36 +0200
From:	Christoph Hellwig <hch@....de>
To:	Jens Axboe <axboe@...nel.dk>
Cc:	"Martin K. Petersen" <martin.petersen@...cle.com>,
	Neil Brown <neilb@...e.de>, Liu Bo <bo.li.liu@...cle.com>,
	linux-raid@...r.kernel.org, dm-devel@...hat.com,
	linux-btrfs@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: add a bi_error field to struct bio V3

Bio error reporting has been a mess for a while, and the increasing
use of chained bios makes it worse.  Add a bi_error field to struct
bio to fix this.

Note that the rebase to 4.2-rc means a lot of context changes, so I've
dropped the Reviewed-by tags from V2 as it will need a re-review.

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