forked from Minki/linux
md/raid0: fix bug with chunksize not a power of 2.
Since commit20d0189b10
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:20d0189b10
Cc: stable@vger.kernel.org (3.14 and later). Signed-off-by: NeilBrown <neilb@suse.de>
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@ -313,7 +313,7 @@ static struct strip_zone *find_zone(struct r0conf *conf,
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/*
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* remaps the bio to the target device. we separate two flows.
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* power 2 flow and a general flow for the sake of perfromance
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* power 2 flow and a general flow for the sake of performance
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*/
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static struct md_rdev *map_sector(struct mddev *mddev, struct strip_zone *zone,
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sector_t sector, sector_t *sector_offset)
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@ -524,6 +524,7 @@ static void raid0_make_request(struct mddev *mddev, struct bio *bio)
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split = bio;
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}
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sector = bio->bi_iter.bi_sector;
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zone = find_zone(mddev->private, §or);
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tmp_dev = map_sector(mddev, zone, sector, §or);
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split->bi_bdev = tmp_dev->bdev;
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