commit: 486adf72ccc0c235754923d47a2270c5dcb0c98b
From: NeilBrown <neilb@xxxxxxx>
Date: Wed, 24 Apr 2013 11:42:44 +1000
Subject: md: bad block list should default to disabled.
Maintenance of a bad-block-list currently defaults to 'enabled'
and is then disabled when it cannot be supported.
This is backwards and causes problem for dm-raid which didn't know
to disable it.
So fix the defaults, and only enabled for v1.x metadata which
explicitly has bad blocks enabled.
The problem with dm-raid has been present since badblock support was
added in v3.1, so this patch is suitable for any -stable from 3.1
onwards.
Cc: stable@xxxxxxxxxxxxxxx (3.1+)
Reported-by: Jonathan Brassow <jbrassow@xxxxxxxxxx>
Signed-off-by: NeilBrown <neilb@xxxxxxx>
---
drivers/md/md.c | 9 +++------
1 file changed, 3 insertions(+), 6 deletions(-)
diff --git a/drivers/md/md.c b/drivers/md/md.c
index 0df1b9a..4c74424 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -1567,8 +1567,8 @@ static int super_1_load(struct md_rdev *rdev, struct md_rdev *refdev, int minor_
sector, count, 1) == 0)
return -EINVAL;
}
- } else if (sb->bblog_offset == 0)
- rdev->badblocks.shift = -1;
+ } else if (sb->bblog_offset != 0)
+ rdev->badblocks.shift = 0;
if (!refdev) {
ret = 1;
@@ -3227,7 +3227,7 @@ int md_rdev_init(struct md_rdev *rdev)
* be used - I wonder if that matters
*/
rdev->badblocks.count = 0;
- rdev->badblocks.shift = 0;
+ rdev->badblocks.shift = -1; /* disabled until explicitly enabled */
rdev->badblocks.page = kmalloc(PAGE_SIZE, GFP_KERNEL);
seqlock_init(&rdev->badblocks.lock);
if (rdev->badblocks.page == NULL)
@@ -3299,9 +3299,6 @@ static struct md_rdev *md_import_device(dev_t newdev, int super_format, int supe
goto abort_free;
}
}
- if (super_format == -1)
- /* hot-add for 0.90, or non-persistent: so no badblocks */
- rdev->badblocks.shift = -1;
return rdev;
--
1.7.10.4
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