tjh.dev / kernel
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[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>

authored by

Andrew Morton and committed by
Linus Torvalds a5453be4 577a4f81

+1
+1
fs/bio.c
··· 261 261 */ 262 262 bio->bi_vcnt = bio_src->bi_vcnt; 263 263 bio->bi_size = bio_src->bi_size; 264 + bio->bi_idx = bio_src->bi_idx; 264 265 bio_phys_segments(q, bio); 265 266 bio_hw_segments(q, bio); 266 267 }