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From 2afec61845b4c0bed64c257a0acc2612e1862885 Mon Sep 17 00:00:00 2001
From: majianpeng <majianpeng@gmail.com>
Date: Tue, 12 Jun 2012 08:31:10 +0800
Subject: [PATCH 15/49] md/raid5: Do not add data_offset before call to
is_badblock
commit 6c0544e255dd6582a9899572e120fb55d9f672a4 upstream.
In chunk_aligned_read() we are adding data_offset before calling
is_badblock. But is_badblock also adds data_offset, so that is bad.
So move the addition of data_offset to after the call to
is_badblock.
This bug was introduced by commit 31c176ecdf3563140e639
md/raid5: avoid reading from known bad blocks.
which first appeared in 3.0. So that patch is suitable for any
-stable kernel from 3.0.y onwards. However it will need minor
revision for most of those (as the comment didn't appear until
recently).
Signed-off-by: majianpeng <majianpeng@gmail.com>
Signed-off-by: NeilBrown <neilb@suse.de>
[bwh: Backported to 3.2: ignored missing comment]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---
drivers/md/raid5.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
index 858fdbb..d423c7e 100644
--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -3621,7 +3621,6 @@ static int chunk_aligned_read(struct mddev *mddev, struct bio * raid_bio)
raid_bio->bi_next = (void*)rdev;
align_bi->bi_bdev = rdev->bdev;
align_bi->bi_flags &= ~(1 << BIO_SEG_VALID);
- align_bi->bi_sector += rdev->data_offset;
if (!bio_fits_rdev(align_bi) ||
is_badblock(rdev, align_bi->bi_sector, align_bi->bi_size>>9,
@@ -3632,6 +3631,9 @@ static int chunk_aligned_read(struct mddev *mddev, struct bio * raid_bio)
return 0;
}
+ /* No reshape active, so we can trust rdev->data_offset */
+ align_bi->bi_sector += rdev->data_offset;
+
spin_lock_irq(&conf->device_lock);
wait_event_lock_irq(conf->wait_for_stripe,
conf->quiesce == 0,
--
1.7.10
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