[10/13] [PATCH] bio_clone fix

[Chris Wright]

-stable review patch.  If anyone has any objections, please let us know.

------------------

[PATCH] bio_clone fix

Fix bug introduced in 2.6.11-rc2: when we clone a BIO we need to copy over the
current index into it as well.

It corrupts data with some MD setups.

See http://bugzilla.kernel.org/show_bug.cgi?id=4946

Huuuuuuuuge thanks to Matthew Stapleton <matthew4196@xxxxxxxxx> for doggedly
chasing this one down.

Acked-by: Jens Axboe <axboe@xxxxxxx>
Cc: <linux-raid@xxxxxxxxxxxxxxx>
Cc: <dm-devel@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxx>
Signed-off-by: Linus Torvalds <torvalds@xxxxxxxx>
Signed-off-by: Chris Wright <chrisw@xxxxxxxx>
---

 fs/bio.c |    1 +
 1 files changed, 1 insertion(+)

diff --git a/fs/bio.c b/fs/bio.c
--- a/fs/bio.c
+++ b/fs/bio.c
@@ -261,6 +261,7 @@ inline void __bio_clone(struct bio *bio,
 	 */
 	bio->bi_vcnt = bio_src->bi_vcnt;
 	bio->bi_size = bio_src->bi_size;
+	bio->bi_idx = bio_src->bi_idx;
 	bio_phys_segments(q, bio);
 	bio_hw_segments(q, bio);
 }
-
-
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