This is a note to let you know that I've just added the patch titled md/raid0: fix bug with chunksize not a power of 2. to the 4.0-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: md-raid0-fix-bug-with-chunksize-not-a-power-of-2.patch and it can be found in the queue-4.0 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From 47d68979cc968535cb87f3e5f2e6a3533ea48fbd Mon Sep 17 00:00:00 2001 From: NeilBrown <neilb@xxxxxxx> Date: Fri, 10 Apr 2015 13:19:04 +1000 Subject: md/raid0: fix bug with chunksize not a power of 2. From: NeilBrown <neilb@xxxxxxx> 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@xxxxxxxxx> Reported-by: Dave Chinner <david@xxxxxxxxxxxxx> Fixes: 20d0189b1012a37d2533a87fb451f7852f2418d1 Signed-off-by: NeilBrown <neilb@xxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/md/raid0.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) --- a/drivers/md/raid0.c +++ b/drivers/md/raid0.c @@ -313,7 +313,7 @@ static struct strip_zone *find_zone(stru /* * 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) @@ -524,6 +524,7 @@ static void raid0_make_request(struct md 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; Patches currently in stable-queue which might be from neilb@xxxxxxx are queue-4.0/md-fix-md-io-stats-accounting-broken.patch queue-4.0/md-raid0-fix-bug-with-chunksize-not-a-power-of-2.patch -- To unsubscribe from this list: send the line "unsubscribe stable" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html