Fw: [PATCH] bio_clone fix

[Andrew Morton <akpm@osdl.org>]

This is an important fix affecting both 2.6.11 and 2.6.12.  Anyone who is
experiencing data loss issues on MD or DM setups with those kernels should
apply.


Begin forwarded message:

Date: Thu, 28 Jul 2005 10:31:10 -0700
From: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
To: bk-commits-head@vger.kernel.org
Subject: [PATCH] bio_clone fix


tree c1d224f0fb4db22e87567e1eea45001a7b11e51f
parent 577a4f8102d54b504cb22eb021b89e957e8df18f
author Andrew Morton <akpm@osdl.org> Thu, 28 Jul 2005 15:07:18 -0700
committer Linus Torvalds <torvalds@g5.osdl.org> Thu, 28 Jul 2005 22:38:59 -0700

[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@gmail.com> for doggedly
chasing this one down.

Acked-by: Jens Axboe <axboe@suse.de>
Cc: <linux-raid@vger.kernel.org>
Cc: <dm-devel@redhat.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

 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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