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| author | majianpeng <majianpeng@gmail.com> | 2012-06-12 08:31:10 +0800 |
|---|---|---|
| committer | Ben Hutchings <ben@decadent.org.uk> | 2012-07-12 04:32:05 +0100 |
| commit | ebfdf3076402b08d6fd97141ac40149ff13f70ea (patch) | |
| tree | ecc5f5034bf1012e6cd9ada07b479a55d7ce871a | |
| parent | 2e9e8f43671774f754629eda8489946bf09fe4fc (diff) | |
| download | lwn-ebfdf3076402b08d6fd97141ac40149ff13f70ea.tar.gz lwn-ebfdf3076402b08d6fd97141ac40149ff13f70ea.zip | |
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>
| -rw-r--r-- | drivers/md/raid5.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c index 858fdbb7eb07..d423c7eefb62 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, |