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btrfs: Put mirror_num in bi_bdev

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The error correction code wants to make sure that only the bad mirror is
rewritten. Thus, we need to know which mirror is the bad one. I did not
find a more apropriate field than bi_bdev. But I think using this is fine,
because it is modified by the block layer, anyway, and should not be read
after the bio returned.

Signed-off-by: Jan Schmidt <list.btrfs@jan-o-sch.net>
This commit is contained in:
Jan Schmidt 2011-06-16 12:05:19 +02:00
parent 1503140d3e
commit 2774b2ca3d
1 changed files with 2 additions and 0 deletions
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2
fs/btrfs/volumes.c
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@ -3216,6 +3216,8 @@ static void btrfs_end_bio(struct bio *bio, int err)
}
bio->bi_private = bbio->private;
bio->bi_end_io = bbio->end_io;
bio->bi_bdev = (struct block_device *)
(unsigned long)bbio->mirror_num;
/* only send an error to the higher layers if it is
* beyond the tolerance of the multi-bio
*/