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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: add a bi_error field to struct bio V3
Date: Mon, 20 Jul 2015 15:29:36 +0200
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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.