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Subject[PATCH] md: Fix for raid6 reshape.
### Comments for Changeset

Recent patch for raid6 reshape had a change missing that showed up in
subsequent review.

Many places in the raid5 code used "conf->raid_disks-1" to mean
"number of data disks". With raid6 that had to be changed to
"conf->raid_disk - conf->max_degraded" or similar. One place was missed.

This bug means that if a raid6 reshape were aborted in the middle the
recorded position would be wrong. On restart it would either fail (as
the position wasn't on an appropriate boundary) or would leave a section
of the array unreshaped, causing data corruption.

Signed-off-by: Neil Brown <>

### Diffstat output
./drivers/md/raid5.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff .prev/drivers/md/raid5.c ./drivers/md/raid5.c
--- .prev/drivers/md/raid5.c 2007-03-02 15:47:51.000000000 +1100
+++ ./drivers/md/raid5.c 2007-03-02 15:48:35.000000000 +1100
@@ -3071,7 +3071,7 @@ static sector_t reshape_request(mddev_t
- conf->expand_progress = (sector_nr + i)*(conf->raid_disks-1);
+ conf->expand_progress = (sector_nr + i) * new_data_disks);
/* Ok, those stripe are ready. We can start scheduling
* reads on the source stripes.
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