diff options
author | NeilBrown <neilb@suse.de> | 2015-04-10 13:19:04 +1000 |
---|---|---|
committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2015-05-06 21:59:09 +0200 |
commit | d12a39f9297b848817e764c0dab6ff4064c7f5a3 (patch) | |
tree | 0419aebb5a5768d79b833d0d3ce9eb74aef7c547 | |
parent | dc47dff305502021de6ab9ea652ca2ef2fdf227f (diff) |
md/raid0: fix bug with chunksize not a power of 2.
commit 47d68979cc968535cb87f3e5f2e6a3533ea48fbd upstream.
Since commit 20d0189b1012a37d2533a87fb451f7852f2418d1
in v3.14-rc1 RAID0 has performed incorrect calculations
when the chunksize is not a power of 2.
This happens because "sector_div()" modifies its first argument, but
this wasn't taken into account in the patch.
So restore that first arg before re-using the variable.
Reported-by: Joe Landman <joe.landman@gmail.com>
Reported-by: Dave Chinner <david@fromorbit.com>
Fixes: 20d0189b1012a37d2533a87fb451f7852f2418d1
Signed-off-by: NeilBrown <neilb@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r-- | drivers/md/raid0.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/md/raid0.c b/drivers/md/raid0.c index 407a99e46f69..683e685ed697 100644 --- a/drivers/md/raid0.c +++ b/drivers/md/raid0.c @@ -320,7 +320,7 @@ static struct strip_zone *find_zone(struct r0conf *conf, /* * remaps the bio to the target device. we separate two flows. - * power 2 flow and a general flow for the sake of perfromance + * power 2 flow and a general flow for the sake of performance */ static struct md_rdev *map_sector(struct mddev *mddev, struct strip_zone *zone, sector_t sector, sector_t *sector_offset) @@ -538,6 +538,7 @@ static void raid0_make_request(struct mddev *mddev, struct bio *bio) split = bio; } + sector = bio->bi_iter.bi_sector; zone = find_zone(mddev->private, §or); tmp_dev = map_sector(mddev, zone, sector, §or); split->bi_bdev = tmp_dev->bdev; |