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Subject[10/13] [PATCH] bio_clone fix
-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.


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

Acked-by: Jens Axboe <>
Cc: <>
Cc: <>
Signed-off-by: Andrew Morton <>
Signed-off-by: Linus Torvalds <>
Signed-off-by: Chris Wright <>

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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