Hi Neil et al,
The scenario: Having LVM (striped) volumes on top of 2 raid1 devices
The problem: Corruption in building the scatter gather list for
device driver (see /drivers/block/blk_rq_map_sg() function)
In DM code, a bio sometimes can be split into several
clones and the clones' bi_idx is set accordingly by DM. MD raid1 also
clones bio but does not adjust bi_idx. The problem can be fixed in
either __bio_clone() or the caller of bio_clone(). I chose to fix
raid1.
--- linux-2.6.12-rc4-orig/drivers/md/raid1.c 2005-05-10 13:35:06.000000000-0500
+++ linux-2.6.12-rc4-patch/drivers/md/raid1.c 2005-05-13 15:41:43.000000000-0500
@@ -577,6 +577,7 @@
r1_bio->bios[rdisk] = read_bio;
+ read_bio->bi_idx = bio->bi_idx;
read_bio->bi_sector = r1_bio->sector + mirror->rdev->data_offset;
read_bio->bi_bdev = mirror->rdev->bdev;
read_bio->bi_end_io = raid1_end_read_request;
--
Regards,
Mike T.
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