diff options
authorEric Work <>2015-05-18 23:26:23 -0700
committerGreg Kroah-Hartman <>2015-06-06 08:19:39 -0700
commitdc82d264943e31b681c28c8398dc094635245bd2 (patch)
parent41801e3c8024d12cfeacc3be4c79d0dad9a74b46 (diff)
md/raid0: fix restore to sector variable in raid0_make_request
commit a81157768a00e8cf8a7b43b5ea5cac931262374f upstream. The variable "sector" in "raid0_make_request()" was improperly updated by a call to "sector_div()" which modifies its first argument in place. Commit 47d68979cc968535cb87f3e5f2e6a3533ea48fbd restored this variable after the call for later re-use. Unfortunetly the restore was done after the referenced variable "bio" was advanced. This lead to the original value and the restored value being different. Here we move this line to the proper place. One observed side effect of this bug was discarding a file though unlinking would cause an unrelated file's contents to be discarded. Signed-off-by: NeilBrown <> Fixes: 47d68979cc96 ("md/raid0: fix bug with chunksize not a power of 2.") URL: Signed-off-by: Greg Kroah-Hartman <>
1 files changed, 3 insertions, 1 deletions
diff --git a/drivers/md/raid0.c b/drivers/md/raid0.c
index 683e685ed697..9afd00b45f83 100644
--- a/drivers/md/raid0.c
+++ b/drivers/md/raid0.c
@@ -531,6 +531,9 @@ static void raid0_make_request(struct mddev *mddev, struct bio *bio)
? (sector & (chunk_sects-1))
: sector_div(sector, chunk_sects));
+ /* Restore due to sector_div */
+ sector = bio->bi_iter.bi_sector;
if (sectors < bio_sectors(bio)) {
split = bio_split(bio, sectors, GFP_NOIO, fs_bio_set);
bio_chain(split, bio);
@@ -538,7 +541,6 @@ 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;