md/raid0: fix bug with chunksize not a power of 2. (47d68979) · Commits · 戴 / test

Since commit 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: Cc: stable@vger.kernel.org (3.14 and later). Signed-off-by:

NeilBrown <neilb@suse.de>

drivers/md/raid0.c

+2 −1

Original line number	Diff line number	Diff line
		@@ -313,7 +313,7 @@ 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)
		@@ -524,6 +524,7 @@ static void raid0_make_request(struct mddev mddev, struct bio bio)
		split = bio;
		}

		sector = bio->bi_iter.bi_sector;
		zone = find_zone(mddev->private, &sector);
		tmp_dev = map_sector(mddev, zone, sector, &sector);
		split->bi_bdev = tmp_dev->bdev;

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